Add .avif extension

Signed-off-by: Hardcore Sushi <hardcore.sushi@disroot.org>

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "app/libcryfs"]
 	path = app/libcryfs
 	url = https://forge.chapril.org/hardcoresushi/libcryfs.git
+[submodule "app/ffmpeg/ffmpeg"]
+	path = app/ffmpeg/ffmpeg
+	url = https://git.ffmpeg.org/ffmpeg.git

BUILD.md

@@ -1,18 +1,21 @@
 # Introduction
 DroidFS relies on modified versions of the original encrypted filesystems programs to open volumes. [CryFS](https://github.com/cryfs/cryfs) is written in C++ while [gocryptfs](https://github.com/rfjakob/gocryptfs) is written in [Go](https://golang.org). Thus, building DroidFS requires the compilation of native code. However, for the sake of simplicity, the application has been designed in a modular way: you can build a version of DroidFS that supports both Gocryptfs and CryFS, or only one of the two.
 
-Moreover, DroidFS aims to be accessible to as many people as possible. If you encounter any problems or need help with the build, feel free to open an issue, a discussion, or contact me by [email](mailto:hardcore.sushi@disroot.org) or on [Matrix](https://matrix.org): @hardcoresushi:matrix.underworld.fr
+Moreover, DroidFS aims to be accessible to as many people as possible. If you encounter any problems or need help with the build, feel free to open an issue, a discussion, or contact me (currently the main developer) by [email](mailto:gh@arkensys.dedyn.io) or on [Matrix](https://matrix.org): @hardcoresushi:matrix.underworld.fr
 
 # Setup
+
+The following two steps assume you're using a Debian-based Linux distribution. Package names might be similar for other distributions. Don't hesitate to ask if you're having trouble with this.
+
 Install required packages:
 ```
-$ sudo apt-get install openjdk-11-jdk-headless build-essential pkg-config git gnupg2 wget apksigner
+$ sudo apt-get install openjdk-17-jdk-headless build-essential pkg-config git gnupg2 wget apksigner npm
 ```
-You also need to manually install the [Android SDK](https://developer.android.com/studio/index.html#command-tools) and the [Android Native Development Kit (NDK)](https://developer.android.com/ndk/downloads) (r23 versions are recommended).
+You also need to manually install the [Android SDK](https://developer.android.com/studio/index.html#command-tools) and the [Android Native Development Kit (NDK)](https://github.com/android/ndk/wiki/Unsupported-Downloads#r25c) version `25.2.9519653` (r25c). libcryfs cannot be built with newer NDK versions at the moment due to compatibility issues with [boost](https://www.boost.org). If you succeed in building it with a more recent version of NDK, please report it.
 
-If you want a support for Gocryptfs volumes, you must install [Go](https://golang.org/doc/install) and libssl:
+If you want a support for Gocryptfs volumes, you need to install [Go](https://golang.org/doc/install):
 ```
-$ sudo apt-get install golang-go libssl-dev
+$ sudo apt-get install golang-go
 ```
 The code should be authenticated before being built. To verify the signatures, you will need my PGP key:
 ```
@@ -24,7 +27,7 @@ Email: `Hardcore Sushi <hardcore.sushi@disroot.org>`
 # Download sources
 Download DroidFS source code:
 ```
-$ git clone --depth=1 https://github.com/hardcore-sushi/DroidFS.git
+$ git clone --depth=1 https://forge.chapril.org/hardcoresushi/DroidFS.git
 ```
 Verify sources:
 ```
@@ -35,31 +38,17 @@ __Don't continue if the verification fails!__
 
 Initialize submodules:
 ```
-$ git submodule update --depth=1 --init
+$ git submodule update --init
 ```
-[FFmpeg](https://ffmpeg.org) is needed to record encrypted video:
+If you want Gocryptfs support, initliaze libgocryptfs submodules:
 ```
-$ cd app/ffmpeg
-$ git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git
+$ cd app/libgocryptfs
+$ git submodule update --init
 ```
-If you want Gocryptfs support, you need to download OpenSSL:
-```
-$ cd ../libgocryptfs
-$ wget https://www.openssl.org/source/openssl-1.1.1p.tar.gz
-```
-Verify OpenSSL signature:
-```
-$ wget https://www.openssl.org/source/openssl-1.1.1p.tar.gz.asc
-$ gpg --verify openssl-1.1.1p.tar.gz.asc openssl-1.1.1p.tar.gz
-```
-Continue **ONLY** if the signature is **VALID**.
-```
-$ tar -xzf openssl-1.1.1p.tar.gz
-```
-If you want CryFS support, initialize libcryfs:
+If you want CryFS support, initialize libcryfs submodules:
 ```
 $ cd app/libcryfs
-$ git submodule update --depth=1 --init
+$ git submodule update --init
 ```
 
 # Build
@@ -67,31 +56,33 @@ Retrieve your Android NDK installation path, usually something like `/home/\<use
 ```
 $ export ANDROID_NDK_HOME="<your ndk path>"
 ```
+If you know your CPU ABI, you can specify it to build scripts in order to speed up compilation time. If you don't know it, or want to build for all ABIs, just leave the field blank.
+
 Start by compiling FFmpeg:
 ```
 $ cd app/ffmpeg
-$ ./build.sh ffmpeg
+$ ./build.sh [<ABI>]
 ```
 ## libgocryptfs
 This step is only required if you want Gocryptfs support.
 ```
 $ cd app/libgocryptfs
-$ OPENSSL_PATH="./openssl-1.1.1p" ./build.sh
- ```
+$ ./build.sh [<ABI>]
+```
 ## Compile APKs
 Gradle build libgocryptfs and libcryfs by default.
 
 To build DroidFS without Gocryptfs support, run:
 ```
-$ ./gradlew assembleRelease -PdisableGocryptfs=true
+$ ./gradlew assembleRelease [-Pabi=<ABI>] -PdisableGocryptfs=true
 ```
 To build DroidFS without CryFS support, run:
 ```
-$ ./gradlew assembleRelease -PdisableCryFS=true
+$ ./gradlew assembleRelease [-Pabi=<ABI>] -PdisableCryFS=true
 ```
 If you want to build DroidFS with support for both Gocryptfs and CryFS, just run:
 ```
-$ ./gradlew assembleRelease
+$ ./gradlew assembleRelease [-Pabi=<ABI>]
 ```
 
 # Sign APKs

DONATE.txt

@@ -0,0 +1,20 @@
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA256
+
+Here are the DroidFS donation addresses:
+
+Monero (XMR):
+
+86f82JEMd33WfapNZETukJW17eEa6RR4rW3wNEZ2CAZh228EYpDaar4DdDPUc4U3YT4CcFdW4c7462Uzx9Em2BB92Aj9fbT
+
+Bitcoin (BTC):
+
+bc1qeyvpy3tj4rr4my5f5wz9s8a4g4nh4l0kj4h6xy
+
+-----BEGIN PGP SIGNATURE-----
+
+iHUEARYIAB0WIQS2Tv6GzuHQVPCCFxGv44Q0SkXhOgUCZNuhaAAKCRCv44Q0SkXh
+OqEUAP0d67oFlGp5IlBHwNI/p2KMHka3LzHdQTBQs40Jus3tVQEAsTZEy/sc6Nwp
+C8mAXUTebijFgrlYYQkfVS0RBXHwggo=
+=E6ia
+-----END PGP SIGNATURE-----

README.md

@@ -1,45 +1,74 @@
 # DroidFS
-DroidFS is an alternative way to use encrypted overlay filesystems on Android that uses its own internal file explorer instead of mounting virtual volumes.
-It currently supports [gocryptfs](https://github.com/rfjakob/gocryptfs) and [CryFS](https://github.com/cryfs/cryfs) (alpha).
+An alternative way to use encrypted virtual filesystems on Android that uses its own internal file explorer instead of mounting volumes.
+It currently supports [gocryptfs](https://github.com/rfjakob/gocryptfs) and [CryFS](https://github.com/cryfs/cryfs).
+
+For mortals: Encrypted storage compatible with already existing softwares.
 
 <p align="center">
 <img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/1.png" height="500">
-<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/2.png" height="500">
-<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/3.png" height="500">
+<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/4.png" height="500">
+<img src="https://forge.chapril.org/hardcoresushi/DroidFS/raw/branch/master/fastlane/metadata/android/en-US/images/phoneScreenshots/6.png" height="500">
 </p>
 
+# Support
+The creator of DroidFS works as a freelance developer and privacy consultant. I am currently looking for new clients! If you are interested, take a look at the [website](https://arkensys.dedyn.io). Alternatively, you can directly support DroidFS by making a [donation](https://forge.chapril.org/hardcoresushi/DroidFS/src/branch/master/DONATE.txt).
+
+Thank you so much ❤️.
+
 # Disclaimer
 DroidFS is provided "as is", without any warranty of any kind.
 It shouldn't be considered as an absolute safe way to store files.
 DroidFS cannot protect you from screen recording apps, keyloggers, apk backdooring, compromised root accesses, memory dumps etc.
 Do not use this app with volumes containing sensitive data unless you know exactly what you are doing.
 
+# Features
+- Compatible with original encrypted volume implementations
+- Internal support for video, audio, images, text and PDF files
+- Built-in camera to take on-the-fly encrypted photos and videos
+- Unlocking volumes using fingerprint authentication
+- Volume auto-locking when the app goes in background
+
+For planned features, see [TODO.md](https://forge.chapril.org/hardcoresushi/DroidFS/src/branch/master/TODO.md).
+
 # Unsafe features
-DroidFS allows you to enable/disable unsafe features to fit your needs between security and comfort.
-It is strongly recommended to read the documentation of a feature before enabling it.
+Some available features are considered risky and are therefore disabled by default. It is strongly recommended that you read the following documentation if you wish to activate one of these options.
 
 <ul>
-  <li><h4>Allow screenshots:</h4>
+  <li><b>Allow screenshots:</b>
+
   Disable the secure flag of DroidFS activities. This will allow you to take screenshots from the app, but will also allow other apps to record the screen while using DroidFS.
-  Note: apps with root access don't care about this flag: they can take screenshots or record the screen of any app without any permissions.
-  </li>
-  <li><h4>Allow opening files with other applications *:</h4>
-  Decrypt and open file using external apps. These apps could save and send the files thus opened.
-  </li>
-  <li><h4>Allow exporting files:</h4>
-  Decrypt and write file to disk (external storage). Any app with storage permissions could access exported files.
-  </li>
-  <li><h4>Allow sharing files via the android share menu *:</h4>
-  Decrypt and share file with other apps. These apps could save and send the files thus shared.
-  </li>
-  <li><h4>Keep volume open when the app goes in background:</h4>
-  Don't close the volume when you leave the app but keep running it in the background. Anyone going back to the activity could have access to the volume.
-  </li>
-  <li><h4>Allow saving password hash using fingerprint:</h4>
-  Generate an AES-256 GCM key in the Android Keystore (protected by fingerprint authentication), then use it to encrypt the volume password hash and store it to the DroidFS internal storage. This require Android v6.0+. If your device is not encrypted, extracting the encryption key with physical access may be possible.
-  </li>
+
+  Note: apps with root access don't care about this flag: they can take screenshots or record the screen of any app without any permissions.</li>
+  <li><b>Allow exporting files:</b>
+
+  Decrypt and write file to disk (external storage). Any app with storage permissions could access exported files.</li>
+  <li><b>Allow sharing files via the android share menu⁽¹⁾:</b>
+
+  Decrypt and share file with other apps. These apps could save and send the files thus shared.</li>
+  <li><b>Allow saving password hash using fingerprint:</b>
+
+  Generate an AES-256 GCM key in the Android Keystore (protected by fingerprint authentication), then use it to encrypt the volume password hash and store it to the DroidFS internal storage. This require Android v6.0+. If your device is not encrypted, extracting the encryption key with physical access may be possible.</li>
+  <li><b>Disable volume auto-locking:</b> (previously called <i>"Keep volumes open when the app goes in background"</i>)
+
+  Don't close open volumes when you leave the app. Anyone going back to the application could have access to open volumes. Cryptographic secrets are kept in memory for an undefined amount of time.</li>
+  <li><b>Keep volumes open:</b>
+  (Different from the old <i>"Keep volumes open when the app goes in background"</i>. Yes it's confusing, sorry)
+
+  Keep the app running as a [foreground service](https://developer.android.com/develop/background-work/services/foreground-services) to maintain volumes open, even when the app is removed from recent tasks.
+
+  This avoid the app from being killed by the system during file operations or while accessing exposed volumes, but this mean cryptographic secrets stay in memory for an undefined amount of time.</li>
+  <li><b>Allow opening files with other applications⁽¹⁾:</b>
+
+  Decrypt and open file using external apps. These apps could save and send the files thus opened.</li>
+  <li><b>Expose open volumes⁽¹⁾:</b>
+
+  Allow open volumes to be browsed in the system file explorer (<a href="https://developer.android.com/guide/topics/providers/document-provider">DocumentProvider</a> API). Encrypted files can then be selected from other applications, potentially with permanent access. This feature requires <i>"Disable volume auto-locking"</i>, and works more reliably when <i>"Keep volumes open"</i> is also enabled.</li>
+  <li><b>Grant write access:</b>
+
+  Files opened with another applications can be modified by them. This applies to both previous unsafe features.</li>
 </ul>
-* Features requiring temporary writing of the plain file to disk (DroidFS internal storage). This file could be read by apps with root access or by physical access if your device is not encrypted.
+
+⁽¹⁾: These features can work in two ways: temporarily writing the plain file to disk (DroidFS internal storage) or sharing it via memory. By default, DroidFS will choose to keep the file only in memory as it's more secure, but will fallback to disk export if the file is too large to be held in memory. This behavior can be changed with the *"Export method"* parameter in the settings. Please note that some applications require the file to be stored on disk, and therefore do not work with memory-exported files.
 
 # Download
 <a href="https://f-droid.org/packages/sushi.hardcore.droidfs">
@@ -65,25 +94,16 @@ __Don't install the APK if the checksums don't match!__
 F-Droid APKs should be signed with the F-Droid key. More details [here](https://f-droid.org/docs/Release_Channels_and_Signing_Keys).
 
 # Permissions
-DroidFS need some permissions to work properly. Here is why:
+DroidFS needs some permissions for certain features. However, you are free to deny them if you do not wish to use these features.
 
-<ul>
-  <li><h4>Read & write access to shared storage:</h4>
-  Required for creating, opening and modifying volumes and for importing/exporting files to/from volumes.
-  </li>
-  <li><h4>Biometric/Fingerprint hardware:</h4>
-  Required to encrypt/decrypt password hashes using a fingerprint protected key.
-  </li>
-  <li><h4>Camera:</h4>
-  Needed to take photos & videos directly encrypted inside DroidFS. You can deny this permission if you don't want to use it.
-  </li>
-  <li><h4>Record audio:</h4>
-  Required if you want sound on video recorded with DroidFS.
-  </li>
-</ul>
+- **Read & write access to shared storage**: Required to access volumes located on shared storage.
+- **Biometric/Fingerprint hardware**: Required to encrypt/decrypt password hashes using a fingerprint protected key.
+- **Camera**: Required to take encrypted photos or videos directly from the app.
+- **Record audio**: Required if you want sound on video recorded with DroidFS.
+- **Notifications**: Used to report file operations progress and notify about volumes kept open.
 
 # Limitations
-DroidFS works as a wrapper around modified versions of the original encrypted container implementations ([libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) and [libcryfs](https://forge.chapril.org/hardcoresushi/libcryfs)). These programs were designed to run on standard x86 Linux systems: they access the underlying file system with file paths and syscalls. However, on Android, you can't access files from other applications using file paths. Instead, one has to use the [ContentProvider](https://developer.android.com/guide/topics/providers/content-providers) API. Obviously, neither Gocryptfs nor CryFS support this API. As a result, DroidFS cannot open volumes provided by other applications (such as cloud storage clients), nor can it allow other applications to access encrypted volumes once opened.
+DroidFS works as a wrapper around modified versions of the original encrypted container implementations ([libgocryptfs](https://forge.chapril.org/hardcoresushi/libgocryptfs) and [libcryfs](https://forge.chapril.org/hardcoresushi/libcryfs)). These programs were designed to run on standard x86 Linux systems: they access the underlying file system with file paths and syscalls. However, on Android, you can't access files from other applications using file paths. Instead, one has to use the [ContentProvider](https://developer.android.com/guide/topics/providers/content-providers) API. Obviously, neither Gocryptfs nor CryFS support this API. As a result, DroidFS cannot open volumes provided by other applications (such as cloud storage clients). If you want to synchronize your volumes on a cloud, the cloud application must synchronize the encrypted directory from disk.
 
 Due to Android's storage restrictions, encrypted volumes located on SD cards must be placed under `/Android/data/sushi.hardcore.droidfs/` if you want DroidFS to be able to modify them.
 
@@ -102,5 +122,5 @@ Thanks to these open source projects that DroidFS uses:
 ### Borrowed code:
 - [MaterialFiles](https://github.com/zhanghai/MaterialFiles) for Kotlin natural sorting implementation
 ### Libraries:
-- [Glide](https://github.com/bumptech/glide/) to display pictures
+- [Glide](https://github.com/bumptech/glide) to display pictures
 - [ExoPlayer](https://github.com/google/ExoPlayer) to play media files

TODO.md

@@ -0,0 +1,30 @@
+# TODO
+
+Here's a list of features that it would be nice to have in DroidFS. As this is a FLOSS project, there are no special requirements on *when* or even *if* these features will be implemented, but contributions are greatly appreciated.
+
+## Security
+- [hardened_malloc](https://github.com/GrapheneOS/hardened_malloc) compatibility ([#181](https://github.com/hardcore-sushi/DroidFS/issues/181))
+- Internal keyboard for passwords
+
+## UX
+- File associations editor
+- Discovery before exporting
+- Making discovery before file operations optional
+- Modifiable scrypt parameters
+- Alert dialog showing details of file operations
+- Internal file browser to select volumes
+
+## Encryption software support
+- [Shufflecake](https://shufflecake.net): plausible deniability for multiple hidden filesystems on Linux (would be absolutely awesome to have but quite difficult)
+- [fscrypt](https://www.kernel.org/doc/html/latest/filesystems/fscrypt.html): filesystem encryption at the kernel level
+
+## Health
+- Remove all android:configChanges from AndroidManifest.xml
+- More efficient thumbnails cache
+- Guide for translators
+- Usage & code documentation
+- Automated tests
+
+## And:
+- All the [feature requests on the GitHub repo](https://github.com/hardcore-sushi/DroidFS/issues?q=is%3Aissue+is%3Aopen+label%3Aenhancement)
+- All the [feature requests on the Gitea repo](https://forge.chapril.org/hardcoresushi/DroidFS/issues?q=&state=open&labels=748)

app/CMakeLists.txt

@@ -5,6 +5,9 @@ project(DroidFS)
 option(GOCRYPTFS "build libgocryptfs" ON)
 option(CRYFS "build libcryfs" ON)
 
+add_library(memfile SHARED src/main/native/memfile.c)
+target_link_libraries(memfile log)
+
 if (GOCRYPTFS)
 	add_library(gocryptfs SHARED IMPORTED)
 	set_target_properties(
@@ -72,4 +75,5 @@ target_link_libraries(
         avformat
         avcodec
         avutil
+        log
 )

app/build.gradle

@@ -14,24 +14,39 @@ if (hasProperty("disableGocryptfs")) {
 }
 
 android {
-    compileSdkVersion 31
-    buildToolsVersion "31"
-    ndkVersion "23.1.7779620"
+    compileSdk 34
+    ndkVersion '25.2.9519653'
+    namespace "sushi.hardcore.droidfs"
 
     compileOptions {
-        targetCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_17
+        sourceCompatibility JavaVersion.VERSION_17
     }
 
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+
+    def abiCodes  = [ "x86": 1, "x86_64": 2, "armeabi-v7a": 3, "arm64-v8a": 4]
+
     defaultConfig {
         applicationId "sushi.hardcore.droidfs"
         minSdkVersion 21
-        //noinspection ExpiredTargetSdkVersion
-        targetSdkVersion 29
-        versionCode 28
-        versionName "2.0.0-alpha1"
+        targetSdkVersion 34
+        versionCode 37
+        versionName "2.2.0"
 
-        ndk {
-            abiFilters "x86", "x86_64", "armeabi-v7a", "arm64-v8a"
+        splits {
+            abi {
+                enable true
+                reset() // fix unknown bug (https://ru.stackoverflow.com/questions/1557805/abis-armeabi-mips-mips64-riscv64-are-not-supported-for-platform)
+                if (project.hasProperty("abi")) {
+                    include project.getProperty("abi")
+                } else {
+                    abiCodes.keySet().each { abi -> include abi }
+                    universalApk !project.hasProperty("nouniversal")
+                }
+            }
         }
 
         externalNativeBuild.cmake {
@@ -44,23 +59,25 @@ android {
         }
     }
 
-    if (!file("fdroid").exists()) {
-        splits {
-            abi {
-                enable true
-                universalApk true
+    applicationVariants.configureEach { variant ->
+        variant.resValue "string", "versionName", variant.versionName
+        buildConfigField "boolean", "CRYFS_DISABLED", "${project.ext.disableCryFS}"
+        buildConfigField "boolean", "GOCRYPTFS_DISABLED", "${project.ext.disableGocryptfs}"
+        variant.outputs.each { output ->
+            def abi = output.getFilter(com.android.build.OutputFile.ABI)
+            if (abi == null) { // universal
+                output.versionCodeOverride = variant.versionCode*10
+                output.outputFileName = "DroidFS-v${variant.versionName}-${variant.name}-universal.apk"
+            } else {
+                output.versionCodeOverride = variant.versionCode*10 + abiCodes[abi]
+                output.outputFileName = "DroidFS-v${variant.versionName}-${variant.name}-${abi}.apk"
             }
         }
     }
 
-    applicationVariants.all { variant ->
-        variant.resValue "string", "versionName", variant.versionName
-        buildConfigField "boolean", "CRYFS_DISABLED", "${project.ext.disableCryFS}"
-        buildConfigField "boolean", "GOCRYPTFS_DISABLED", "${project.ext.disableGocryptfs}"
-    }
-
     buildFeatures {
         viewBinding true
+        buildConfig true
     }
 
     buildTypes {
@@ -80,32 +97,45 @@ android {
             path file('CMakeLists.txt')
         }
     }
+
+    sourceSets {
+        main {
+            java {
+                exclude 'androidx/camera/video/originals/**'
+            }
+        }
+    }
 }
 
 dependencies {
     implementation project(":libpdfviewer:app")
-    implementation fileTree(dir: "libs", include: ["*.jar"])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
-    implementation 'androidx.core:core-ktx:1.7.0'
-    implementation "androidx.appcompat:appcompat:1.4.1"
-    implementation "androidx.constraintlayout:constraintlayout:2.1.3"
+    implementation 'androidx.core:core-ktx:1.13.1'
+    implementation "androidx.appcompat:appcompat:1.7.0"
+    implementation "androidx.constraintlayout:constraintlayout:2.1.4"
+    def lifecycle_version = "2.8.3"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-process:$lifecycle_version"
 
-    implementation "androidx.sqlite:sqlite-ktx:2.2.0"
-    implementation "androidx.preference:preference-ktx:1.2.0"
+    implementation "androidx.preference:preference-ktx:1.2.1"
     implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
-    implementation 'com.google.android.material:material:1.5.0'
-    implementation "com.github.bumptech.glide:glide:4.12.0"
-    implementation "androidx.biometric:biometric-ktx:1.2.0-alpha04"
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'com.github.bumptech.glide:glide:4.16.0'
+    implementation "androidx.biometric:biometric-ktx:1.2.0-alpha05"
 
-    def exoplayer_version = "2.17.1"
-    implementation "com.google.android.exoplayer:exoplayer-core:$exoplayer_version"
-    implementation "com.google.android.exoplayer:exoplayer-ui:$exoplayer_version"
+    def media3_version = "1.3.1"
+    implementation "androidx.media3:media3-exoplayer:$media3_version"
+    implementation "androidx.media3:media3-ui:$media3_version"
+    implementation "androidx.media3:media3-datasource:$media3_version"
 
-    implementation "androidx.concurrent:concurrent-futures:1.1.0"
-
-    def camerax_version = "1.1.0-beta03"
+    def camerax_version = "1.3.4"
     implementation "androidx.camera:camera-camera2:$camerax_version"
     implementation "androidx.camera:camera-lifecycle:$camerax_version"
     implementation "androidx.camera:camera-view:$camerax_version"
     implementation "androidx.camera:camera-extensions:$camerax_version"
+
+    // dependencies needed by CameraX patch
+    implementation "androidx.concurrent:concurrent-futures:1.2.0"
+    def autoValueVersion = '1.10.4'
+    implementation "com.google.auto.value:auto-value-annotations:$autoValueVersion"
+    annotationProcessor "com.google.auto.value:auto-value:$autoValueVersion"
 }

app/ffmpeg/.gitignore

@@ -1,2 +1 @@
-ffmpeg
 build

app/ffmpeg/build.sh

@@ -1,13 +1,13 @@
 #!/bin/bash
 
+set -e
+
 if [ -z ${ANDROID_NDK_HOME+x} ]; then
 	echo "Error: \$ANDROID_NDK_HOME is not defined." >&2
 	exit 1
-elif [ $# -lt 1 ]; then
-	echo "Usage: $0 <FFmpeg source directory> [<ABI>]" >&2
-	exit 1
 else
-	FFMPEG_DIR=$1
+	cd "$(dirname "$0")"
+	FFMPEG_DIR="ffmpeg"
 	compile_for_arch() {
 		echo "Compiling for $1..."
 		case $1 in
@@ -29,7 +29,8 @@ else
 				ARCH="arm"
 				;;
 		esac
-		(cd $FFMPEG_DIR && make clean;
+		(cd $FFMPEG_DIR
+		make clean || true
 		./configure \
 			--cc="$CFN" \
 			--cxx="$CFN++" \
@@ -63,6 +64,7 @@ else
 			--disable-sndio \
 			--disable-schannel \
 			--disable-securetransport \
+			--disable-vulkan \
 			--disable-xlib \
 			--disable-zlib \
 			--disable-cuvid \
@@ -72,22 +74,19 @@ else
 			--disable-audiotoolbox \
 			--disable-appkit \
 			--disable-alsa \
-			--disable-debug \
-			>/dev/null &&
-		make -j $(nproc --all) >/dev/null) &&
-		mkdir -p build/$1/libavformat build/$1/libavcodec build/$1/libavutil &&
-		cp $FFMPEG_DIR/libavformat/*.h $FFMPEG_DIR/libavformat/libavformat.so build/$1/libavformat &&
-		cp $FFMPEG_DIR/libavcodec/*.h $FFMPEG_DIR/libavcodec/libavcodec.so build/$1/libavcodec &&
-		cp $FFMPEG_DIR/libavutil/*.h $FFMPEG_DIR/libavutil/libavutil.so build/$1/libavutil ||
-		exit 1
+			--disable-debug
+		make -j "$(nproc --all)" >/dev/null)
+		mkdir -p "build/$1/libavformat" "build/$1/libavcodec" "build/$1/libavutil"
+		cp $FFMPEG_DIR/libavformat/*.h $FFMPEG_DIR/libavformat/libavformat.so "build/$1/libavformat"
+		cp $FFMPEG_DIR/libavcodec/*.h $FFMPEG_DIR/libavcodec/libavcodec.so "build/$1/libavcodec"
+		cp $FFMPEG_DIR/libavutil/*.h $FFMPEG_DIR/libavutil/libavutil.so "build/$1/libavutil"
 	}
 
 	export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
-	if [ $# -eq 2 ]; then
-		compile_for_arch $2
+	if [ $# -eq 1 ]; then
+		compile_for_arch "$1"
 	else
-		declare -a ABIs=("x86_64" "x86" "arm64-v8a" "armeabi-v7a")
-		for abi in ${ABIs[@]}; do
+		for abi in "x86_64" "x86" "arm64-v8a" "armeabi-v7a"; do
 			compile_for_arch $abi
 		done
 	fi

app/ffmpeg/ffmpeg

@@ -0,0 +1 @@
+Subproject commit af25a4bfd2503caf3ee485b27b99b620302f5718

app/libcryfs

@@ -1 +1 @@
-Subproject commit 356cf8a1604776cb2cc4f4ff873936f7b396bd49
+Subproject commit cd0af7088066f870f12eceed9836bde897f1d164

app/libgocryptfs

@@ -1 +1 @@
-Subproject commit e6e4c201dbf3834de1a49a8b67b4b54239d24249
+Subproject commit b221d4cf3c70edc711169a769a476802d2577b2b

app/proguard-rules.pro

@@ -1,31 +1,18 @@
-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile
+-keepattributes SourceFile,LineNumberTable
 
 -keep class sushi.hardcore.droidfs.SettingsActivity$**
 -keep class sushi.hardcore.droidfs.explorers.ExplorerElement
 -keepclassmembers class sushi.hardcore.droidfs.explorers.ExplorerElement {
     static sushi.hardcore.droidfs.explorers.ExplorerElement new(...);
 }
--keepclassmembers class sushi.hardcore.droidfs.video_recording.MediaMuxer {
+-keepclassmembers class sushi.hardcore.droidfs.video_recording.FFmpegMuxer {
     void writePacket(byte[]);
     void seek(long);
-}
+}
+# Required for Intent.getParcelableExtra() to work on Android 13
+-keep class sushi.hardcore.droidfs.VolumeData {
+    public int describeContents();
+}
+-keep class sushi.hardcore.droidfs.VolumeData$* {
+    static public android.os.Parcelable$Creator CREATOR;
+}

app/src/main/AndroidManifest.xml

@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    package="sushi.hardcore.droidfs"
     android:installLocation="auto">
 
-    <permission
-        android:name="${applicationId}.WRITE_TEMPORARY_STORAGE"
-        android:protectionLevel="signature" />
-
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.USE_BIOMETRIC" />
     <uses-permission android:name="android.permission.CAMERA" />
@@ -25,12 +24,14 @@
         tools:node="remove" /> <!--removing this permission automatically added by exoplayer-->
 
     <application
-        android:allowBackup="false"
-        android:icon="@mipmap/icon_launcher"
+        android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:requestLegacyExternalStorage="true"
         android:supportsRtl="true"
-        android:theme="@style/BaseTheme">
+        android:theme="@style/BaseTheme"
+        android:name=".VolumeManagerApp"
+        android:fullBackupContent="false"
+        android:dataExtractionRules="@xml/backup_rules">
         <activity android:name=".MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -49,26 +50,40 @@
         <activity android:name=".explorers.ExplorerActivity"/>
         <activity android:name=".explorers.ExplorerActivityPick"/>
         <activity android:name=".explorers.ExplorerActivityDrop"/>
-        <activity android:name=".file_viewers.ImageViewer" android:configChanges="screenSize|orientation" /> <!-- don't reload content on configuration change -->
+        <activity android:name=".file_viewers.ImageViewer"/>
         <activity android:name=".file_viewers.VideoPlayer" android:configChanges="screenSize|orientation" />
-        <activity android:name=".file_viewers.PdfViewer" android:configChanges="screenSize|orientation" />
+        <activity android:name=".file_viewers.PdfViewer" android:configChanges="screenSize|orientation" android:theme="@style/AppTheme" />
         <activity android:name=".file_viewers.AudioPlayer" android:configChanges="screenSize|orientation" />
         <activity android:name=".file_viewers.TextEditor" android:configChanges="screenSize|orientation" />
         <activity android:name=".CameraActivity" android:screenOrientation="nosensor" />
+        <activity android:name=".LogcatActivity"/>
 
-        <service android:name=".file_operations.FileOperationService" android:exported="false"/>
+        <service android:name=".KeepAliveService" android:exported="false" android:foregroundServiceType="dataSync" />
+        <service android:name=".ClosingService" android:exported="false" android:stopWithTask="false"/>
+        <service android:name=".file_operations.FileOperationService" android:exported="false" android:foregroundServiceType="dataSync"/>
 
-        <receiver android:name=".file_operations.NotificationBroadcastReceiver" android:exported="false">
+        <receiver android:name=".NotificationBroadcastReceiver" android:exported="false">
             <intent-filter>
                 <action android:name="file_operation_cancel"/>
             </intent-filter>
         </receiver>
 
         <provider
-            android:name=".content_providers.RestrictedFileProvider"
+            android:name=".content_providers.TemporaryFileProvider"
             android:authorities="${applicationId}.temporary_provider"
+            android:exported="true"/>
+
+        <provider
+            android:authorities="${applicationId}.volume_provider"
+            android:name=".content_providers.VolumeProvider"
             android:exported="true"
-            android:writePermission="${applicationId}.WRITE_TEMPORARY_STORAGE" />
+            android:grantUriPermissions="true"
+            android:permission="android.permission.MANAGE_DOCUMENTS">
+            <intent-filter>
+                <action android:name="android.content.action.DOCUMENTS_PROVIDER" />
+            </intent-filter>
+        </provider>
+
     </application>
 
 </manifest>

app/src/main/java/androidx/camera/video/MediaMuxer.kt

@@ -0,0 +1,14 @@
+package androidx.camera.video
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import java.nio.ByteBuffer
+
+interface MediaMuxer {
+    fun setOrientationHint(degree: Int)
+    fun release()
+    fun addTrack(mediaFormat: MediaFormat): Int
+    fun start()
+    fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo)
+    fun stop()
+}

app/src/main/java/androidx/camera/video/MuxerOutputOptions.kt

@@ -0,0 +1,16 @@
+package androidx.camera.video
+
+import android.location.Location
+
+class MuxerOutputOptions(private val mediaMuxer: MediaMuxer): OutputOptions(MuxerOutputOptionsInternal()) {
+
+    private class MuxerOutputOptionsInternal: OutputOptionsInternal() {
+        override fun getFileSizeLimit(): Long = FILE_SIZE_UNLIMITED.toLong()
+
+        override fun getDurationLimitMillis(): Long = DURATION_UNLIMITED.toLong()
+
+        override fun getLocation(): Location? = null
+    }
+
+    fun getMediaMuxer(): MediaMuxer = mediaMuxer
+}

app/src/main/java/androidx/camera/video/SucklessPendingRecording.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import android.Manifest;
+import android.annotation.SuppressLint;
+import android.content.Context;
+
+import androidx.annotation.CheckResult;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RequiresPermission;
+import androidx.camera.core.impl.utils.ContextUtil;
+import androidx.core.content.PermissionChecker;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+
+/**
+ * A recording that can be started at a future time.
+ *
+ * <p>A pending recording allows for configuration of a recording before it is started. Once a
+ * pending recording is started with {@link #start(Executor, Consumer)}, any changes to the pending
+ * recording will not affect the actual recording; any modifications to the recording will need
+ * to occur through the controls of the {@link SucklessRecording} class returned by
+ * {@link #start(Executor, Consumer)}.
+ *
+ * <p>A pending recording can be created using one of the {@link Recorder} methods for starting a
+ * recording such as {@link Recorder#prepareRecording(Context, MediaStoreOutputOptions)}.
+
+ * <p>There may be more settings that can only be changed per-recorder instead of per-recording,
+ * because it requires expensive operations like reconfiguring the camera. For those settings, use
+ * the {@link Recorder.Builder} methods to configure before creating the {@link Recorder}
+ * instance, then create the pending recording with it.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+@SuppressLint("RestrictedApi")
+public final class SucklessPendingRecording {
+
+    private final Context mContext;
+    private final SucklessRecorder mRecorder;
+    private final OutputOptions mOutputOptions;
+    private Consumer<VideoRecordEvent> mEventListener;
+    private Executor mListenerExecutor;
+    private boolean mAudioEnabled = false;
+    private boolean mIsPersistent = false;
+
+    SucklessPendingRecording(@NonNull Context context, @NonNull SucklessRecorder recorder,
+            @NonNull OutputOptions options) {
+        // Application context is sufficient for all our needs, so store that to avoid leaking
+        // unused resources. For attribution, ContextUtil.getApplicationContext() will retain the
+        // attribution tag from the original context.
+        mContext = ContextUtil.getApplicationContext(context);
+        mRecorder = recorder;
+        mOutputOptions = options;
+    }
+
+    /**
+     * Returns an application context which was retrieved from the {@link Context} used to
+     * create this object.
+     */
+    @NonNull
+    Context getApplicationContext() {
+        return mContext;
+    }
+
+    @NonNull
+    SucklessRecorder getRecorder() {
+        return mRecorder;
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    @Nullable
+    Executor getListenerExecutor() {
+        return mListenerExecutor;
+    }
+
+    @Nullable
+    Consumer<VideoRecordEvent> getEventListener() {
+        return mEventListener;
+    }
+
+    boolean isAudioEnabled() {
+        return mAudioEnabled;
+    }
+
+    boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Enables audio to be recorded for this recording.
+     *
+     * <p>This method must be called prior to {@link #start(Executor, Consumer)} to enable audio
+     * in the recording. If this method is not called, the {@link SucklessRecording} generated by
+     * {@link #start(Executor, Consumer)} will not contain audio, and
+     * {@link AudioStats#getAudioState()} will always return
+     * {@link AudioStats#AUDIO_STATE_DISABLED} for all {@link RecordingStats} send to the listener
+     * set passed to {@link #start(Executor, Consumer)}.
+     *
+     * <p>Recording with audio requires the {@link android.Manifest.permission#RECORD_AUDIO}
+     * permission; without it, recording will fail at {@link #start(Executor, Consumer)} with an
+     * {@link IllegalStateException}.
+     *
+     * @return this pending recording
+     * @throws IllegalStateException if the {@link Recorder} this recording is associated to
+     * doesn't support audio.
+     * @throws SecurityException if the {@link Manifest.permission#RECORD_AUDIO} permission
+     * is denied for the current application.
+     */
+    @RequiresPermission(Manifest.permission.RECORD_AUDIO)
+    @NonNull
+    public SucklessPendingRecording withAudioEnabled() {
+        // Check permissions and throw a security exception if RECORD_AUDIO is not granted.
+        if (PermissionChecker.checkSelfPermission(mContext, Manifest.permission.RECORD_AUDIO)
+                == PermissionChecker.PERMISSION_DENIED) {
+            throw new SecurityException("Attempted to enable audio for recording but application "
+                    + "does not have RECORD_AUDIO permission granted.");
+        }
+        Preconditions.checkState(mRecorder.isAudioSupported(), "The Recorder this recording is "
+                + "associated to doesn't support audio.");
+        mAudioEnabled = true;
+        return this;
+    }
+
+    /**
+     * Configures the recording to be a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling
+     * {@link Recording#stop()} or {@link Recording#close()} and will ignore events that would
+     * normally cause recording to stop, such as lifecycle events or explicit unbinding of a
+     * {@link VideoCapture} use case that the recording's {@link Recorder} is attached to.
+     *
+     * <p>Even though lifecycle events or explicit unbinding use cases won't stop a persistent
+     * recording, it will still stop the camera from producing data, resulting in the in-progress
+     * persistent recording stopping getting data until the camera stream is activated again. For
+     * example, when the activity goes into background, the recording will keep waiting for new
+     * data to be recorded until the activity is back to foreground.
+     *
+     * <p>A {@link Recorder} instance is recommended to be associated with a single
+     * {@link VideoCapture} instance, especially when using persistent recording. Otherwise, there
+     * might be unexpected behavior. Any in-progress persistent recording created from the same
+     * {@link Recorder} should be stopped before starting a new recording, even if the
+     * {@link Recorder} is associated with a different {@link VideoCapture}.
+     *
+     * <p>To switch to a different camera stream while a recording is in progress, first create
+     * the recording as persistent recording, then rebind the {@link VideoCapture} it's
+     * associated with to a different camera. The implementation may be like:
+     * <pre>{@code
+     * // Prepare the Recorder and VideoCapture, then bind the VideoCapture to the back camera.
+     * Recorder recorder = Recorder.Builder().build();
+     * VideoCapture videoCapture = VideoCapture.withOutput(recorder);
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, videoCapture);
+     *
+     * // Prepare the persistent recording and start it.
+     * Recording recording = recorder
+     *         .prepareRecording(context, outputOptions)
+     *         .asPersistentRecording()
+     *         .start(eventExecutor, eventListener);
+     *
+     * // Record from the back camera for a period of time.
+     *
+     * // Rebind the VideoCapture to the front camera.
+     * cameraProvider.unbindAll();
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_FRONT_CAMERA, videoCapture);
+     *
+     * // Record from the front camera for a period of time.
+     *
+     * // Stop the recording explicitly.
+     * recording.stop();
+     * }</pre>
+     *
+     * <p>The audio data will still be recorded after the {@link VideoCapture} is unbound.
+     * {@link Recording#pause() Pause} the recording first and {@link Recording#resume() resume} it
+     * later to stop recording audio while rebinding use cases.
+     *
+     * <p>If the recording is unable to receive data from the new camera, possibly because of
+     * incompatible surface combination, an exception will be thrown when binding to lifecycle.
+     */
+    @ExperimentalPersistentRecording
+    @NonNull
+    public SucklessPendingRecording asPersistentRecording() {
+        mIsPersistent = true;
+        return this;
+    }
+
+    /**
+     * Starts the recording, making it an active recording.
+     *
+     * <p>Only a single recording can be active at a time, so if another recording is active,
+     * this will throw an {@link IllegalStateException}.
+     *
+     * <p>If there are no errors starting the recording, the returned {@link SucklessRecording}
+     * can be used to {@link SucklessRecording#pause() pause}, {@link SucklessRecording#resume() resume},
+     * or {@link SucklessRecording#stop() stop} the recording.
+     *
+     * <p>Upon successfully starting the recording, a {@link VideoRecordEvent.Start} event will
+     * be the first event sent to the provided event listener.
+     *
+     * <p>If errors occur while starting the recording, a {@link VideoRecordEvent.Finalize} event
+     * will be the first event sent to the provided listener, and information about the error can
+     * be found in that event's {@link VideoRecordEvent.Finalize#getError()} method. The returned
+     * {@link SucklessRecording} will be in a finalized state, and all controls will be no-ops.
+     *
+     * <p>If the returned {@link SucklessRecording} is garbage collected, the recording will be
+     * automatically stopped. A reference to the active recording must be maintained as long as
+     * the recording needs to be active. If the recording is garbage collected, the
+     * {@link VideoRecordEvent.Finalize} event will contain error
+     * {@link VideoRecordEvent.Finalize#ERROR_RECORDING_GARBAGE_COLLECTED}.
+     *
+     * <p>The {@link Recording} will be stopped automatically if the {@link VideoCapture} its
+     * {@link Recorder} is attached to is unbound unless it's created
+     * {@link #asPersistentRecording() as a persistent recording}.
+     *
+     * @throws IllegalStateException if the associated Recorder currently has an unfinished
+     * active recording.
+     * @param listenerExecutor the executor that the event listener will be run on.
+     * @param listener the event listener to handle video record events.
+     */
+    @NonNull
+    @CheckResult
+    public SucklessRecording start(
+            @NonNull Executor listenerExecutor,
+            @NonNull Consumer<VideoRecordEvent> listener) {
+        Preconditions.checkNotNull(listenerExecutor, "Listener Executor can't be null.");
+        Preconditions.checkNotNull(listener, "Event listener can't be null");
+        mListenerExecutor = listenerExecutor;
+        mEventListener = listener;
+        return mRecorder.start(this);
+    }
+}
+

app/src/main/java/androidx/camera/video/SucklessRecording.java

@@ -0,0 +1,263 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;
+
+import android.annotation.SuppressLint;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RestrictTo;
+import androidx.camera.core.impl.utils.CloseGuardHelper;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Provides controls for the currently active recording.
+ *
+ * <p>An active recording is created by starting a pending recording with
+ * {@link PendingRecording#start(Executor, Consumer)}. If there are no errors starting the
+ * recording, upon creation, an active recording will provide controls to pause, resume or stop a
+ * recording. If errors occur while starting the recording, the active recording will be
+ * instantiated in a {@link VideoRecordEvent.Finalize finalized} state, and all controls will be
+ * no-ops. The state of the recording can be observed by the video record event listener provided
+ * to {@link PendingRecording#start(Executor, Consumer)} when starting the recording.
+ *
+ * <p>Either {@link #stop()} or {@link #close()} can be called when it is desired to
+ * stop the recording. If {@link #stop()} or {@link #close()} are not called on this object
+ * before it is no longer referenced, it will be automatically stopped at a future point in time
+ * when the object is garbage collected, and no new recordings can be started from the same
+ * {@link Recorder} that generated the object until that occurs.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+@SuppressLint("RestrictedApi")
+public final class SucklessRecording implements AutoCloseable {
+
+    // Indicates the recording has been explicitly stopped by users.
+    private final AtomicBoolean mIsClosed = new AtomicBoolean(false);
+    private final SucklessRecorder mRecorder;
+    private final long mRecordingId;
+    private final OutputOptions mOutputOptions;
+    private final boolean mIsPersistent;
+    private final CloseGuardHelper mCloseGuard = CloseGuardHelper.create();
+
+    SucklessRecording(@NonNull SucklessRecorder recorder, long recordingId, @NonNull OutputOptions options,
+            boolean isPersistent, boolean finalizedOnCreation) {
+        mRecorder = recorder;
+        mRecordingId = recordingId;
+        mOutputOptions = options;
+        mIsPersistent = isPersistent;
+
+        if (finalizedOnCreation) {
+            mIsClosed.set(true);
+        } else {
+            mCloseGuard.open("stop");
+        }
+    }
+
+    /**
+     * Creates an {@link SucklessRecording} from a {@link PendingRecording} and recording ID.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static SucklessRecording from(@NonNull SucklessPendingRecording pendingRecording, long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new SucklessRecording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/false);
+    }
+
+    /**
+     * Creates an {@link SucklessRecording} from a {@link PendingRecording} and recording ID in a
+     * finalized state.
+     *
+     * <p>This can be used if there was an error setting up the active recording and it would not
+     * be able to be started.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static SucklessRecording createFinalizedFrom(@NonNull SucklessPendingRecording pendingRecording,
+                                                 long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new SucklessRecording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/true);
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    /**
+     * Returns whether this recording is a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling of
+     * {@link Recording#stop()} and will ignore the lifecycle events or source state changes.
+     * Users are responsible of stopping a persistent recording.
+     *
+     * @return {@code true} if the recording is a persistent recording, otherwise {@code false}.
+     */
+    @ExperimentalPersistentRecording
+    public boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Pauses the current recording if active.
+     *
+     * <p>Successful pausing of a recording will generate a {@link VideoRecordEvent.Pause} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording has already been paused or has been finalized internally, this is a
+     * no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void pause() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.pause(this);
+    }
+
+    /**
+     * Resumes the current recording if paused.
+     *
+     * <p>Successful resuming of a recording will generate a {@link VideoRecordEvent.Resume} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording is active or has been finalized internally, this is a no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void resume() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.resume(this);
+    }
+
+    /**
+     * Stops the recording, as if calling {@link #close()}.
+     *
+     * <p>This method is equivalent to calling {@link #close()}.
+     */
+    public void stop() {
+        close();
+    }
+
+    /**
+     * Mutes or un-mutes the current recording.
+     *
+     * <p>The output file will contain an audio track even the whole recording is muted. Create a
+     * recording without calling {@link PendingRecording#withAudioEnabled()} to record a file
+     * with no audio track.
+     *
+     * <p>Muting or unmuting a recording that isn't created
+     * {@link PendingRecording#withAudioEnabled()} with audio enabled is no-op.
+     *
+     * @param muted mutes the recording if {@code true}, un-mutes otherwise.
+     */
+    public void mute(boolean muted) {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.mute(this, muted);
+    }
+
+    /**
+     * Close this recording.
+     *
+     * <p>Once {@link #stop()} or {@code close()} called, all methods for controlling the state of
+     * this recording besides {@link #stop()} or {@code close()} will throw an
+     * {@link IllegalStateException}.
+     *
+     * <p>Once an active recording has been closed, the next recording can be started with
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>This method is idempotent; if the recording has already been closed or has been
+     * finalized internally, calling {@link #stop()} or {@code close()} is a no-op.
+     *
+     * <p>This method is invoked automatically on active recording instances managed by the {@code
+     * try-with-resources} statement.
+     */
+    @Override
+    public void close() {
+        stopWithError(VideoRecordEvent.Finalize.ERROR_NONE, /*errorCause=*/ null);
+    }
+
+    @Override
+    @SuppressWarnings("GenericException") // super.finalize() throws Throwable
+    protected void finalize() throws Throwable {
+        try {
+            mCloseGuard.warnIfOpen();
+            stopWithError(VideoRecordEvent.Finalize.ERROR_RECORDING_GARBAGE_COLLECTED,
+                    new RuntimeException("Recording stopped due to being garbage collected."));
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /** Returns the recording ID which is unique to the recorder that generated this recording. */
+    long getRecordingId() {
+        return mRecordingId;
+    }
+
+    /**
+     * Returns whether the recording is closed.
+     *
+     * <p>The returned value does not reflect the state of the recording; it only reflects
+     * whether {@link #stop()} or {@link #close()} was called on this object.
+     *
+     * <p>The state of the recording should be checked from the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}. Once the active recording is
+     * stopped, a {@link VideoRecordEvent.Finalize} event will be sent to the listener.
+     *
+     */
+    @RestrictTo(LIBRARY_GROUP)
+    public boolean isClosed() {
+        return mIsClosed.get();
+    }
+
+    private void stopWithError(@VideoRecordEvent.Finalize.VideoRecordError int error,
+            @Nullable Throwable errorCause) {
+        mCloseGuard.close();
+        if (mIsClosed.getAndSet(true)) {
+            return;
+        }
+        mRecorder.stop(this, error, errorCause);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/README.md

@@ -0,0 +1,20 @@
+# Update the modified CameraX files to a new upstream version:
+
+Create the `new` folder if needed:
+```
+mkdir -p new
+```
+
+Put the new CameraX files from upstream (`androidx.camera.video.Recorder`, `androidx.camera.video.Recording`, `androidx.camera.video.PendingRecording` and `androidx.camera.video.internal.encoder.EncoderImpl`) in the `new` folder.
+
+Perform the 3 way merge:
+```
+./merge.sh
+```
+
+If new files are created in the current directory, they contains conflicts. Resolve them then move them to the right location.
+
+Finally, update the base:
+```
+./update.sh
+```

app/src/main/java/androidx/camera/video/originals/base/PendingRecording.java

@@ -0,0 +1,252 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import android.Manifest;
+import android.content.Context;
+
+import androidx.annotation.CheckResult;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RequiresPermission;
+import androidx.camera.core.impl.utils.ContextUtil;
+import androidx.core.content.PermissionChecker;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+
+/**
+ * A recording that can be started at a future time.
+ *
+ * <p>A pending recording allows for configuration of a recording before it is started. Once a
+ * pending recording is started with {@link #start(Executor, Consumer)}, any changes to the pending
+ * recording will not affect the actual recording; any modifications to the recording will need
+ * to occur through the controls of the {@link Recording} class returned by
+ * {@link #start(Executor, Consumer)}.
+ *
+ * <p>A pending recording can be created using one of the {@link Recorder} methods for starting a
+ * recording such as {@link Recorder#prepareRecording(Context, MediaStoreOutputOptions)}.
+
+ * <p>There may be more settings that can only be changed per-recorder instead of per-recording,
+ * because it requires expensive operations like reconfiguring the camera. For those settings, use
+ * the {@link Recorder.Builder} methods to configure before creating the {@link Recorder}
+ * instance, then create the pending recording with it.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+public final class PendingRecording {
+
+    private final Context mContext;
+    private final Recorder mRecorder;
+    private final OutputOptions mOutputOptions;
+    private Consumer<VideoRecordEvent> mEventListener;
+    private Executor mListenerExecutor;
+    private boolean mAudioEnabled = false;
+    private boolean mIsPersistent = false;
+
+    PendingRecording(@NonNull Context context, @NonNull Recorder recorder,
+            @NonNull OutputOptions options) {
+        // Application context is sufficient for all our needs, so store that to avoid leaking
+        // unused resources. For attribution, ContextUtil.getApplicationContext() will retain the
+        // attribution tag from the original context.
+        mContext = ContextUtil.getApplicationContext(context);
+        mRecorder = recorder;
+        mOutputOptions = options;
+    }
+
+    /**
+     * Returns an application context which was retrieved from the {@link Context} used to
+     * create this object.
+     */
+    @NonNull
+    Context getApplicationContext() {
+        return mContext;
+    }
+
+    @NonNull
+    Recorder getRecorder() {
+        return mRecorder;
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    @Nullable
+    Executor getListenerExecutor() {
+        return mListenerExecutor;
+    }
+
+    @Nullable
+    Consumer<VideoRecordEvent> getEventListener() {
+        return mEventListener;
+    }
+
+    boolean isAudioEnabled() {
+        return mAudioEnabled;
+    }
+
+    boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Enables audio to be recorded for this recording.
+     *
+     * <p>This method must be called prior to {@link #start(Executor, Consumer)} to enable audio
+     * in the recording. If this method is not called, the {@link Recording} generated by
+     * {@link #start(Executor, Consumer)} will not contain audio, and
+     * {@link AudioStats#getAudioState()} will always return
+     * {@link AudioStats#AUDIO_STATE_DISABLED} for all {@link RecordingStats} send to the listener
+     * set passed to {@link #start(Executor, Consumer)}.
+     *
+     * <p>Recording with audio requires the {@link android.Manifest.permission#RECORD_AUDIO}
+     * permission; without it, recording will fail at {@link #start(Executor, Consumer)} with an
+     * {@link IllegalStateException}.
+     *
+     * @return this pending recording
+     * @throws IllegalStateException if the {@link Recorder} this recording is associated to
+     * doesn't support audio.
+     * @throws SecurityException if the {@link Manifest.permission#RECORD_AUDIO} permission
+     * is denied for the current application.
+     */
+    @RequiresPermission(Manifest.permission.RECORD_AUDIO)
+    @NonNull
+    public PendingRecording withAudioEnabled() {
+        // Check permissions and throw a security exception if RECORD_AUDIO is not granted.
+        if (PermissionChecker.checkSelfPermission(mContext, Manifest.permission.RECORD_AUDIO)
+                == PermissionChecker.PERMISSION_DENIED) {
+            throw new SecurityException("Attempted to enable audio for recording but application "
+                    + "does not have RECORD_AUDIO permission granted.");
+        }
+        Preconditions.checkState(mRecorder.isAudioSupported(), "The Recorder this recording is "
+                + "associated to doesn't support audio.");
+        mAudioEnabled = true;
+        return this;
+    }
+
+    /**
+     * Configures the recording to be a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling
+     * {@link Recording#stop()} or {@link Recording#close()} and will ignore events that would
+     * normally cause recording to stop, such as lifecycle events or explicit unbinding of a
+     * {@link VideoCapture} use case that the recording's {@link Recorder} is attached to.
+     *
+     * <p>Even though lifecycle events or explicit unbinding use cases won't stop a persistent
+     * recording, it will still stop the camera from producing data, resulting in the in-progress
+     * persistent recording stopping getting data until the camera stream is activated again. For
+     * example, when the activity goes into background, the recording will keep waiting for new
+     * data to be recorded until the activity is back to foreground.
+     *
+     * <p>A {@link Recorder} instance is recommended to be associated with a single
+     * {@link VideoCapture} instance, especially when using persistent recording. Otherwise, there
+     * might be unexpected behavior. Any in-progress persistent recording created from the same
+     * {@link Recorder} should be stopped before starting a new recording, even if the
+     * {@link Recorder} is associated with a different {@link VideoCapture}.
+     *
+     * <p>To switch to a different camera stream while a recording is in progress, first create
+     * the recording as persistent recording, then rebind the {@link VideoCapture} it's
+     * associated with to a different camera. The implementation may be like:
+     * <pre>{@code
+     * // Prepare the Recorder and VideoCapture, then bind the VideoCapture to the back camera.
+     * Recorder recorder = Recorder.Builder().build();
+     * VideoCapture videoCapture = VideoCapture.withOutput(recorder);
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_BACK_CAMERA, videoCapture);
+     *
+     * // Prepare the persistent recording and start it.
+     * Recording recording = recorder
+     *         .prepareRecording(context, outputOptions)
+     *         .asPersistentRecording()
+     *         .start(eventExecutor, eventListener);
+     *
+     * // Record from the back camera for a period of time.
+     *
+     * // Rebind the VideoCapture to the front camera.
+     * cameraProvider.unbindAll();
+     * cameraProvider.bindToLifecycle(
+     *         lifecycleOwner, CameraSelector.DEFAULT_FRONT_CAMERA, videoCapture);
+     *
+     * // Record from the front camera for a period of time.
+     *
+     * // Stop the recording explicitly.
+     * recording.stop();
+     * }</pre>
+     *
+     * <p>The audio data will still be recorded after the {@link VideoCapture} is unbound.
+     * {@link Recording#pause() Pause} the recording first and {@link Recording#resume() resume} it
+     * later to stop recording audio while rebinding use cases.
+     *
+     * <p>If the recording is unable to receive data from the new camera, possibly because of
+     * incompatible surface combination, an exception will be thrown when binding to lifecycle.
+     */
+    @ExperimentalPersistentRecording
+    @NonNull
+    public PendingRecording asPersistentRecording() {
+        mIsPersistent = true;
+        return this;
+    }
+
+    /**
+     * Starts the recording, making it an active recording.
+     *
+     * <p>Only a single recording can be active at a time, so if another recording is active,
+     * this will throw an {@link IllegalStateException}.
+     *
+     * <p>If there are no errors starting the recording, the returned {@link Recording}
+     * can be used to {@link Recording#pause() pause}, {@link Recording#resume() resume},
+     * or {@link Recording#stop() stop} the recording.
+     *
+     * <p>Upon successfully starting the recording, a {@link VideoRecordEvent.Start} event will
+     * be the first event sent to the provided event listener.
+     *
+     * <p>If errors occur while starting the recording, a {@link VideoRecordEvent.Finalize} event
+     * will be the first event sent to the provided listener, and information about the error can
+     * be found in that event's {@link VideoRecordEvent.Finalize#getError()} method. The returned
+     * {@link Recording} will be in a finalized state, and all controls will be no-ops.
+     *
+     * <p>If the returned {@link Recording} is garbage collected, the recording will be
+     * automatically stopped. A reference to the active recording must be maintained as long as
+     * the recording needs to be active. If the recording is garbage collected, the
+     * {@link VideoRecordEvent.Finalize} event will contain error
+     * {@link VideoRecordEvent.Finalize#ERROR_RECORDING_GARBAGE_COLLECTED}.
+     *
+     * <p>The {@link Recording} will be stopped automatically if the {@link VideoCapture} its
+     * {@link Recorder} is attached to is unbound unless it's created
+     * {@link #asPersistentRecording() as a persistent recording}.
+     *
+     * @throws IllegalStateException if the associated Recorder currently has an unfinished
+     * active recording.
+     * @param listenerExecutor the executor that the event listener will be run on.
+     * @param listener the event listener to handle video record events.
+     */
+    @NonNull
+    @CheckResult
+    public Recording start(
+            @NonNull Executor listenerExecutor,
+            @NonNull Consumer<VideoRecordEvent> listener) {
+        Preconditions.checkNotNull(listenerExecutor, "Listener Executor can't be null.");
+        Preconditions.checkNotNull(listener, "Event listener can't be null");
+        mListenerExecutor = listenerExecutor;
+        mEventListener = listener;
+        return mRecorder.start(this);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/base/Recording.java

@@ -0,0 +1,260 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.camera.video;
+
+import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.RestrictTo;
+import androidx.camera.core.impl.utils.CloseGuardHelper;
+import androidx.core.util.Consumer;
+import androidx.core.util.Preconditions;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Provides controls for the currently active recording.
+ *
+ * <p>An active recording is created by starting a pending recording with
+ * {@link PendingRecording#start(Executor, Consumer)}. If there are no errors starting the
+ * recording, upon creation, an active recording will provide controls to pause, resume or stop a
+ * recording. If errors occur while starting the recording, the active recording will be
+ * instantiated in a {@link VideoRecordEvent.Finalize finalized} state, and all controls will be
+ * no-ops. The state of the recording can be observed by the video record event listener provided
+ * to {@link PendingRecording#start(Executor, Consumer)} when starting the recording.
+ *
+ * <p>Either {@link #stop()} or {@link #close()} can be called when it is desired to
+ * stop the recording. If {@link #stop()} or {@link #close()} are not called on this object
+ * before it is no longer referenced, it will be automatically stopped at a future point in time
+ * when the object is garbage collected, and no new recordings can be started from the same
+ * {@link Recorder} that generated the object until that occurs.
+ */
+@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
+public final class Recording implements AutoCloseable {
+
+    // Indicates the recording has been explicitly stopped by users.
+    private final AtomicBoolean mIsClosed = new AtomicBoolean(false);
+    private final Recorder mRecorder;
+    private final long mRecordingId;
+    private final OutputOptions mOutputOptions;
+    private final boolean mIsPersistent;
+    private final CloseGuardHelper mCloseGuard = CloseGuardHelper.create();
+
+    Recording(@NonNull Recorder recorder, long recordingId, @NonNull OutputOptions options,
+            boolean isPersistent, boolean finalizedOnCreation) {
+        mRecorder = recorder;
+        mRecordingId = recordingId;
+        mOutputOptions = options;
+        mIsPersistent = isPersistent;
+
+        if (finalizedOnCreation) {
+            mIsClosed.set(true);
+        } else {
+            mCloseGuard.open("stop");
+        }
+    }
+
+    /**
+     * Creates an {@link Recording} from a {@link PendingRecording} and recording ID.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static Recording from(@NonNull PendingRecording pendingRecording, long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new Recording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/false);
+    }
+
+    /**
+     * Creates an {@link Recording} from a {@link PendingRecording} and recording ID in a
+     * finalized state.
+     *
+     * <p>This can be used if there was an error setting up the active recording and it would not
+     * be able to be started.
+     *
+     * <p>The recording ID is expected to be unique to the recorder that generated the pending
+     * recording.
+     */
+    @NonNull
+    static Recording createFinalizedFrom(@NonNull PendingRecording pendingRecording,
+            long recordingId) {
+        Preconditions.checkNotNull(pendingRecording, "The given PendingRecording cannot be null.");
+        return new Recording(pendingRecording.getRecorder(),
+                recordingId,
+                pendingRecording.getOutputOptions(),
+                pendingRecording.isPersistent(),
+                /*finalizedOnCreation=*/true);
+    }
+
+    @NonNull
+    OutputOptions getOutputOptions() {
+        return mOutputOptions;
+    }
+
+    /**
+     * Returns whether this recording is a persistent recording.
+     *
+     * <p>A persistent recording will only be stopped by explicitly calling of
+     * {@link Recording#stop()} and will ignore the lifecycle events or source state changes.
+     * Users are responsible of stopping a persistent recording.
+     *
+     * @return {@code true} if the recording is a persistent recording, otherwise {@code false}.
+     */
+    @ExperimentalPersistentRecording
+    public boolean isPersistent() {
+        return mIsPersistent;
+    }
+
+    /**
+     * Pauses the current recording if active.
+     *
+     * <p>Successful pausing of a recording will generate a {@link VideoRecordEvent.Pause} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording has already been paused or has been finalized internally, this is a
+     * no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void pause() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.pause(this);
+    }
+
+    /**
+     * Resumes the current recording if paused.
+     *
+     * <p>Successful resuming of a recording will generate a {@link VideoRecordEvent.Resume} event
+     * which will be sent to the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>If the recording is active or has been finalized internally, this is a no-op.
+     *
+     * @throws IllegalStateException if the recording has been stopped with
+     * {@link #close()} or {@link #stop()}.
+     */
+    public void resume() {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.resume(this);
+    }
+
+    /**
+     * Stops the recording, as if calling {@link #close()}.
+     *
+     * <p>This method is equivalent to calling {@link #close()}.
+     */
+    public void stop() {
+        close();
+    }
+
+    /**
+     * Mutes or un-mutes the current recording.
+     *
+     * <p>The output file will contain an audio track even the whole recording is muted. Create a
+     * recording without calling {@link PendingRecording#withAudioEnabled()} to record a file
+     * with no audio track.
+     *
+     * <p>Muting or unmuting a recording that isn't created
+     * {@link PendingRecording#withAudioEnabled()} with audio enabled is no-op.
+     *
+     * @param muted mutes the recording if {@code true}, un-mutes otherwise.
+     */
+    public void mute(boolean muted) {
+        if (mIsClosed.get()) {
+            throw new IllegalStateException("The recording has been stopped.");
+        }
+        mRecorder.mute(this, muted);
+    }
+
+    /**
+     * Close this recording.
+     *
+     * <p>Once {@link #stop()} or {@code close()} called, all methods for controlling the state of
+     * this recording besides {@link #stop()} or {@code close()} will throw an
+     * {@link IllegalStateException}.
+     *
+     * <p>Once an active recording has been closed, the next recording can be started with
+     * {@link PendingRecording#start(Executor, Consumer)}.
+     *
+     * <p>This method is idempotent; if the recording has already been closed or has been
+     * finalized internally, calling {@link #stop()} or {@code close()} is a no-op.
+     *
+     * <p>This method is invoked automatically on active recording instances managed by the {@code
+     * try-with-resources} statement.
+     */
+    @Override
+    public void close() {
+        stopWithError(VideoRecordEvent.Finalize.ERROR_NONE, /*errorCause=*/ null);
+    }
+
+    @Override
+    @SuppressWarnings("GenericException") // super.finalize() throws Throwable
+    protected void finalize() throws Throwable {
+        try {
+            mCloseGuard.warnIfOpen();
+            stopWithError(VideoRecordEvent.Finalize.ERROR_RECORDING_GARBAGE_COLLECTED,
+                    new RuntimeException("Recording stopped due to being garbage collected."));
+        } finally {
+            super.finalize();
+        }
+    }
+
+    /** Returns the recording ID which is unique to the recorder that generated this recording. */
+    long getRecordingId() {
+        return mRecordingId;
+    }
+
+    /**
+     * Returns whether the recording is closed.
+     *
+     * <p>The returned value does not reflect the state of the recording; it only reflects
+     * whether {@link #stop()} or {@link #close()} was called on this object.
+     *
+     * <p>The state of the recording should be checked from the listener passed to
+     * {@link PendingRecording#start(Executor, Consumer)}. Once the active recording is
+     * stopped, a {@link VideoRecordEvent.Finalize} event will be sent to the listener.
+     *
+     */
+    @RestrictTo(LIBRARY_GROUP)
+    public boolean isClosed() {
+        return mIsClosed.get();
+    }
+
+    private void stopWithError(@VideoRecordEvent.Finalize.VideoRecordError int error,
+            @Nullable Throwable errorCause) {
+        mCloseGuard.close();
+        if (mIsClosed.getAndSet(true)) {
+            return;
+        }
+        mRecorder.stop(this, error, errorCause);
+    }
+}
+

app/src/main/java/androidx/camera/video/originals/merge.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+set -e
+
+for i in "PendingRecording" "Recording" "Recorder"; do
+	diff3 -m ../Suckless$i.java base/$i.java new/$i.java > Suckless$i.java && mv Suckless$i.java ..
+done
+diff3 -m ../internal/encoder/SucklessEncoderImpl.java base/EncoderImpl.java new/EncoderImpl.java > SucklessEncoderImpl.java && mv SucklessEncoderImpl.java ../internal/encoder/SucklessEncoderImpl.java

app/src/main/java/androidx/camera/video/originals/update.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+rm -r base && mv new base

app/src/main/java/sushi/hardcore/droidfs/BaseActivity.kt

@@ -8,46 +8,18 @@ import androidx.preference.PreferenceManager
 
 open class BaseActivity: AppCompatActivity() {
     protected lateinit var sharedPrefs: SharedPreferences
-    lateinit var themeValue: String
-    private var shouldCheckTheme = true
+    protected var applyCustomTheme: Boolean = true
+    lateinit var theme: Theme
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
-        if (shouldCheckTheme) {
-            themeValue = sharedPrefs.getString("theme", ConstValues.DEFAULT_THEME_VALUE)!!
-            when (themeValue) {
-                "black_green" -> setTheme(R.style.BlackGreen)
-                "dark_red" -> setTheme(R.style.DarkRed)
-                "black_red" -> setTheme(R.style.BlackRed)
-                "dark_blue" -> setTheme(R.style.DarkBlue)
-                "black_blue" -> setTheme(R.style.BlackBlue)
-                "dark_yellow" -> setTheme(R.style.DarkYellow)
-                "black_yellow" -> setTheme(R.style.BlackYellow)
-                "dark_orange" -> setTheme(R.style.DarkOrange)
-                "black_orange" -> setTheme(R.style.BlackOrange)
-                "dark_purple" -> setTheme(R.style.DarkPurple)
-                "black_purple" -> setTheme(R.style.BlackPurple)
-            }
-        } else {
-            shouldCheckTheme = true
-        }
         super.onCreate(savedInstanceState)
-        if (!sharedPrefs.getBoolean("usf_screenshot", false)){
+        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
+        theme = Theme.fromSharedPrefs(sharedPrefs)
+        if (applyCustomTheme) {
+            setTheme(theme.toResourceId())
+        }
+        if (!sharedPrefs.getBoolean("usf_screenshot", false)) {
             window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)
         }
     }
-
-    override fun onStart() {
-        super.onStart()
-        val newThemeValue = sharedPrefs.getString("theme", "dark_green")!!
-        onThemeChanged(newThemeValue)
-    }
-
-    fun onThemeChanged(newThemeValue: String) {
-        if (newThemeValue != themeValue) {
-            themeValue = newThemeValue
-            shouldCheckTheme = false
-            recreate()
-        }
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/CameraActivity.kt

@@ -2,15 +2,15 @@ package sushi.hardcore.droidfs
 
 import android.Manifest
 import android.annotation.SuppressLint
-import android.content.Context
 import android.content.pm.PackageManager
-import android.hardware.camera2.CameraCharacteristics
-import android.hardware.camera2.CameraManager
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
 import android.util.Size
-import android.view.*
+import android.view.MotionEvent
+import android.view.ScaleGestureDetector
+import android.view.Surface
+import android.view.View
 import android.view.animation.Animation
 import android.view.animation.LinearInterpolator
 import android.view.animation.RotateAnimation
@@ -18,30 +18,51 @@ import android.widget.ImageView
 import android.widget.RelativeLayout
 import android.widget.Toast
 import androidx.annotation.RequiresApi
-import androidx.camera.camera2.interop.Camera2CameraInfo
-import androidx.camera.core.*
+import androidx.camera.core.AspectRatio
+import androidx.camera.core.Camera
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.DynamicRange
+import androidx.camera.core.FocusMeteringAction
+import androidx.camera.core.ImageCapture
+import androidx.camera.core.ImageCaptureException
+import androidx.camera.core.Preview
+import androidx.camera.core.UseCase
+import androidx.camera.core.resolutionselector.ResolutionSelector
 import androidx.camera.extensions.ExtensionMode
 import androidx.camera.extensions.ExtensionsManager
 import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.camera.video.MuxerOutputOptions
+import androidx.camera.video.Quality
+import androidx.camera.video.QualitySelector
+import androidx.camera.video.SucklessRecorder
+import androidx.camera.video.SucklessRecording
+import androidx.camera.video.VideoCapture
+import androidx.camera.video.VideoRecordEvent
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.databinding.ActivityCameraBinding
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.finishOnClose
+import sushi.hardcore.droidfs.video_recording.AsynchronousSeekableWriter
+import sushi.hardcore.droidfs.video_recording.FFmpegMuxer
 import sushi.hardcore.droidfs.video_recording.SeekableWriter
-import sushi.hardcore.droidfs.video_recording.VideoCapture
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.text.SimpleDateFormat
-import java.util.*
+import java.util.Date
+import java.util.Locale
+import java.util.Random
 import java.util.concurrent.Executor
+import kotlin.math.pow
+import kotlin.math.sqrt
 
+@SuppressLint("RestrictedApi")
 class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     companion object {
         private const val CAMERA_PERMISSION_REQUEST_CODE = 0
@@ -61,14 +82,12 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 binding.imageTimer.setImageResource(R.drawable.icon_timer_off)
             }
         }
-    private var usf_keep_open = false
     private lateinit var sensorOrientationListener: SensorOrientationListener
+    private var currentRotation = 0
     private var previousOrientation: Float = 0f
     private lateinit var orientedIcons: List<ImageView>
     private lateinit var encryptedVolume: EncryptedVolume
     private lateinit var outputDirectory: String
-    private var isFinishingIntentionally = false
-    private var isAskingPermissions = false
     private var permissionsGranted = false
     private lateinit var executor: Executor
     private lateinit var cameraProvider: ProcessCameraProvider
@@ -76,11 +95,17 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     private lateinit var cameraSelector: CameraSelector
     private val cameraPreview = Preview.Builder().build()
     private var imageCapture: ImageCapture? = null
-    private var videoCapture: VideoCapture? = null
+    private var videoCapture: VideoCapture<SucklessRecorder>? = null
+    private var videoRecorder: SucklessRecorder? = null
+    private var videoRecording: SucklessRecording? = null
     private var camera: Camera? = null
     private var resolutions: List<Size>? = null
     private var currentResolutionIndex: Int = 0
     private var currentResolution: Size? = null
+    private val aspectRatios = arrayOf(AspectRatio.RATIO_16_9, AspectRatio.RATIO_4_3)
+    private var currentAspectRatioIndex = 0
+    private var qualities: List<Quality>? = null
+    private var currentQualityIndex = -1
     private var captureMode = ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
     private var isBackCamera = true
     private var isInVideoMode = false
@@ -90,18 +115,19 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         binding = ActivityCameraBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.hide()
-        encryptedVolume = intent.getParcelableExtra("volume")!!
+        encryptedVolume = (application as VolumeManagerApp).volumeManager.getVolume(
+            intent.getIntExtra("volumeId", -1)
+        )!!
+        finishOnClose(encryptedVolume)
         outputDirectory = intent.getStringExtra("path")!!
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
             if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED){
                 permissionsGranted = true
             } else {
-                isAskingPermissions = true
                 requestPermissions(arrayOf(Manifest.permission.CAMERA), CAMERA_PERMISSION_REQUEST_CODE)
             }
         } else {
@@ -123,50 +149,76 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
 
         binding.imageCaptureMode.setOnClickListener {
-            val currentIndex = if (captureMode == ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY) {
-                0
-            } else {
-                1
-            }
-            CustomAlertDialogBuilder(this, themeValue)
-                .setTitle(R.string.camera_optimization)
-                .setSingleChoiceItems(arrayOf(getString(R.string.maximize_quality), getString(R.string.minimize_latency)), currentIndex) { dialog, which ->
-                    val resId: Int
-                    val newCaptureMode = if (which == 0) {
-                        resId = R.drawable.icon_high_quality
-                        ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
-                    } else {
-                        resId = R.drawable.icon_speed
-                        ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY
-                    }
-                    if (newCaptureMode != captureMode) {
-                        captureMode = newCaptureMode
-                        binding.imageCaptureMode.setImageResource(resId)
-                        if (!isInVideoMode) {
-                            cameraProvider.unbind(imageCapture)
-                            refreshImageCapture()
-                            cameraProvider.bindToLifecycle(this, cameraSelector, imageCapture)
+            if (isInVideoMode) {
+                qualities?.let { qualities ->
+                    val qualityNames = qualities.map {
+                        when (it) {
+                            Quality.UHD -> "UHD"
+                            Quality.FHD -> "FHD"
+                            Quality.HD -> "HD"
+                            Quality.SD -> "SD"
+                            else -> throw IllegalArgumentException("Invalid quality: $it")
                         }
-                    }
-                    dialog.dismiss()
+                    }.toTypedArray()
+                    CustomAlertDialogBuilder(this, theme)
+                        .setTitle("Choose quality:")
+                        .setSingleChoiceItems(qualityNames, currentQualityIndex) { dialog, which ->
+                            currentQualityIndex = which
+                            rebindUseCases()
+                            dialog.dismiss()
+                        }
+                        .setNegativeButton(R.string.cancel, null)
+                        .show()
                 }
-                .setNegativeButton(R.string.cancel, null)
-                .show()
-        }
-        binding.imageRatio.setOnClickListener {
-            resolutions?.let {
-                CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.choose_resolution)
-                    .setSingleChoiceItems(it.map { size -> size.toString() }.toTypedArray(), currentResolutionIndex) { dialog, which ->
-                        currentResolution = resolutions!![which]
-                        currentResolutionIndex = which
-                        setupCamera()
+            } else {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle(R.string.camera_optimization)
+                    .setSingleChoiceItems(
+                        arrayOf(getString(R.string.maximize_quality), getString(R.string.minimize_latency)),
+                        if (captureMode == ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY) 0 else 1
+                    ) { dialog, which ->
+                        val newCaptureMode = if (which == 0) {
+                            ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY
+                        } else {
+                            ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY
+                        }
+                        if (newCaptureMode != captureMode) {
+                            captureMode = newCaptureMode
+                            setCaptureModeIcon()
+                            rebindUseCases()
+                        }
                         dialog.dismiss()
                     }
                     .setNegativeButton(R.string.cancel, null)
                     .show()
             }
         }
+        binding.imageRatio.setOnClickListener {
+            if (isInVideoMode) {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle("Aspect ratio:")
+                    .setSingleChoiceItems(arrayOf("16:9", "4:3"), currentAspectRatioIndex) { dialog, which ->
+                        currentAspectRatioIndex = which
+                        rebindUseCases()
+                        dialog.dismiss()
+                    }
+                    .setNegativeButton(R.string.cancel, null)
+                    .show()
+            } else {
+                resolutions?.let {
+                    CustomAlertDialogBuilder(this, theme)
+                        .setTitle(R.string.choose_resolution)
+                        .setSingleChoiceItems(it.map { size -> size.toString() }.toTypedArray(), currentResolutionIndex) { dialog, which ->
+                            currentResolution = resolutions!![which]
+                            currentResolutionIndex = which
+                            rebindUseCases()
+                            dialog.dismiss()
+                        }
+                        .setNegativeButton(R.string.cancel, null)
+                        .show()
+                }
+            }
+        }
         binding.imageTimer.setOnClickListener {
             with (EditTextDialog(this, R.string.enter_timer_duration) {
                 try {
@@ -212,19 +264,19 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
         binding.imageModeSwitch.setOnClickListener {
             isInVideoMode = !isInVideoMode
-            setupCamera()
+            rebindUseCases()
             binding.imageFlash.setImageResource(if (isInVideoMode) {
                 binding.recordVideoButton.visibility = View.VISIBLE
                 binding.takePhotoButton.visibility = View.GONE
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                     if (ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
-                        isAskingPermissions = true
                         requestPermissions(arrayOf(Manifest.permission.RECORD_AUDIO), AUDIO_PERMISSION_REQUEST_CODE)
                     }
                 }
                 binding.imageModeSwitch.setImageDrawable(ContextCompat.getDrawable(this, R.drawable.icon_photo)?.mutate()?.also {
                     it.setTint(ContextCompat.getColor(this, R.color.neutralIconTint))
                 })
+                setCaptureModeIcon()
                 imageCapture?.flashMode = ImageCapture.FLASH_MODE_OFF
                 R.drawable.icon_flash_off
             } else {
@@ -249,6 +301,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 true
             }
             resolutions = null
+            qualities = null
             setupCamera()
         }
         binding.takePhotoButton.onClick = ::onClickTakePhoto
@@ -283,21 +336,17 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     @RequiresApi(Build.VERSION_CODES.M)
     override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
         super.onRequestPermissionsResult(requestCode, permissions, grantResults)
-        isAskingPermissions = false
         if (grantResults.size == 1) {
             when (requestCode) {
                 CAMERA_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     permissionsGranted = true
                     setupCamera()
                 } else {
-                    CustomAlertDialogBuilder(this, themeValue)
+                    CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.camera_perm_needed)
                         .setCancelable(false)
-                        .setPositiveButton(R.string.ok) { _, _ ->
-                            isFinishingIntentionally = true
-                            finish()
-                        }.show()
+                        .setPositiveButton(R.string.ok) { _, _ -> finish() }.show()
                 }
                 AUDIO_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     if (videoCapture != null) {
@@ -309,6 +358,18 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
     }
 
+    private fun setCaptureModeIcon() {
+        binding.imageCaptureMode.setImageResource(if (isInVideoMode) {
+           R.drawable.icon_high_quality
+        } else {
+             if (captureMode == ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY) {
+                 R.drawable.icon_speed
+             } else {
+                 R.drawable.icon_high_quality
+             }
+        })
+    }
+
     private fun adaptPreviewSize(resolution: Size) {
         val screenWidth = resources.displayMetrics.widthPixels
         val screenHeight = resources.displayMetrics.heightPixels
@@ -328,52 +389,59 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         imageCapture = ImageCapture.Builder()
             .setCaptureMode(captureMode)
             .setFlashMode(imageCapture?.flashMode ?: ImageCapture.FLASH_MODE_AUTO)
-            .apply {
-                currentResolution?.let {
-                    setTargetResolution(it)
+            .setResolutionSelector(ResolutionSelector.Builder().setResolutionFilter { supportedSizes, _ ->
+                resolutions = supportedSizes.sortedBy {
+                    -it.width*it.height
                 }
-            }
+                currentResolution?.let { targetResolution ->
+                    return@setResolutionFilter supportedSizes.sortedBy {
+                        sqrt((it.width - targetResolution.width).toDouble().pow(2) + (it.height - targetResolution.height).toDouble().pow(2))
+                    }
+                }
+                supportedSizes
+            }.build())
+            .setTargetRotation(currentRotation)
             .build()
     }
 
     private fun refreshVideoCapture() {
-        videoCapture = VideoCapture.Builder().apply {
-            currentResolution?.let {
-                setTargetResolution(it)
-            }
-        }.build()
+        val recorderBuilder = SucklessRecorder.Builder()
+            .setExecutor(executor)
+            .setAspectRatio(aspectRatios[currentAspectRatioIndex])
+        if (currentQualityIndex != -1) {
+            recorderBuilder.setQualitySelector(QualitySelector.from(qualities!![currentQualityIndex]))
+        }
+        videoRecorder = recorderBuilder.build()
+        videoCapture = VideoCapture.withOutput(videoRecorder!!).apply {
+            targetRotation = currentRotation
+        }
+    }
+
+    private fun rebindUseCases(): UseCase {
+        cameraProvider.unbindAll()
+        val currentUseCase = (if (isInVideoMode) {
+            refreshVideoCapture()
+            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, videoCapture)
+            if (qualities == null) {
+                qualities = SucklessRecorder.getVideoCapabilities(camera!!.cameraInfo).getSupportedQualities(DynamicRange.UNSPECIFIED)
+            }
+            videoCapture
+        } else {
+            refreshImageCapture()
+            camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture)
+            imageCapture
+        })!!
+        adaptPreviewSize(currentUseCase.attachedSurfaceResolution!!.swap())
+        return currentUseCase
     }
 
-    @SuppressLint("RestrictedApi")
     private fun setupCamera() {
         if (permissionsGranted && ::extensionsManager.isInitialized && ::cameraProvider.isInitialized) {
             cameraSelector = if (isBackCamera){ CameraSelector.DEFAULT_BACK_CAMERA } else { CameraSelector.DEFAULT_FRONT_CAMERA }
             if (extensionsManager.isExtensionAvailable(cameraSelector, ExtensionMode.AUTO)) {
                 cameraSelector = extensionsManager.getExtensionEnabledCameraSelector(cameraSelector, ExtensionMode.AUTO)
             }
-
-            cameraProvider.unbindAll()
-
-            val currentUseCase = (if (isInVideoMode) {
-                refreshVideoCapture()
-                camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, videoCapture)
-                videoCapture
-            } else {
-                refreshImageCapture()
-                camera = cameraProvider.bindToLifecycle(this, cameraSelector, cameraPreview, imageCapture)
-                imageCapture
-            })!!
-
-            adaptPreviewSize(currentResolution ?: currentUseCase.attachedSurfaceResolution!!.swap())
-
-            if (resolutions == null) {
-                val info = Camera2CameraInfo.from(camera!!.cameraInfo)
-                val cameraManager = getSystemService(Context.CAMERA_SERVICE) as CameraManager
-                val characteristics = cameraManager.getCameraCharacteristics(info.cameraId)
-                characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)?.let { streamConfigurationMap ->
-                    resolutions = streamConfigurationMap.getOutputSizes(currentUseCase.imageFormat).map { it.swap() }
-                }
-            }
+            rebindUseCases()
         }
     }
 
@@ -420,14 +488,10 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                             if (encryptedVolume.importFile(ByteArrayInputStream(outputBuff.toByteArray()), outputPath)) {
                                 Toast.makeText(applicationContext, getString(R.string.picture_save_success, outputPath), Toast.LENGTH_SHORT).show()
                             } else {
-                                CustomAlertDialogBuilder(this@CameraActivity, themeValue)
+                                CustomAlertDialogBuilder(this@CameraActivity, theme)
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.picture_save_failed)
-                                    .setCancelable(false)
-                                    .setPositiveButton(R.string.ok) { _, _ ->
-                                        isFinishingIntentionally = true
-                                        finish()
-                                    }
+                                    .setPositiveButton(R.string.ok, null)
                                     .show()
                             }
                         }
@@ -444,61 +508,79 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
     @SuppressLint("MissingPermission")
     private fun onClickRecordVideo() {
         if (isRecording) {
-            videoCapture?.stopRecording()
-            isRecording = false
+            videoRecording?.stop()
         } else if (!isWaitingForTimer) {
             val path = getOutputPath(true)
-            startTimerThen {
-                val fileHandle = encryptedVolume.openFile(path)
-                videoCapture?.startRecording(VideoCapture.OutputFileOptions(object : SeekableWriter {
-                    var offset = 0L
-                    override fun write(byteArray: ByteArray) {
-                        offset += encryptedVolume.write(fileHandle, offset, byteArray, byteArray.size)
-                    }
-                    override fun seek(offset: Long) {
-                        this.offset = offset
-                    }
-                    override fun close() {
-                        encryptedVolume.closeFile(fileHandle)
-                    }
-                }), executor, object : VideoCapture.OnVideoSavedCallback {
-                    override fun onVideoSaved() {
-                        Toast.makeText(applicationContext, getString(R.string.video_save_success, path), Toast.LENGTH_SHORT).show()
-                        binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
-                    }
-                    override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
-                        Toast.makeText(applicationContext, message, Toast.LENGTH_SHORT).show()
-                        cause?.printStackTrace()
-                        binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
-                    }
-                })
-                binding.recordVideoButton.setImageResource(R.drawable.stop_recording_video_button)
-                isRecording = true
+            val fileHandle = encryptedVolume.openFileWriteMode(path)
+            if (fileHandle == -1L) {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle(R.string.error)
+                    .setMessage(R.string.file_creation_failed)
+                    .setPositiveButton(R.string.ok, null)
+                    .show()
+                return
             }
-        }
-    }
+            val writer = AsynchronousSeekableWriter(object : SeekableWriter {
+                private var offset = 0L
 
-    override fun onDestroy() {
-        super.onDestroy()
-        if (!isFinishingIntentionally) {
-            encryptedVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
+                override fun close() {
+                    encryptedVolume.closeFile(fileHandle)
+                }
 
-    override fun onStop() {
-        super.onStop()
-        if (!isFinishing && !usf_keep_open){
-            finish()
+                override fun seek(offset: Long) {
+                    this.offset = offset
+                }
+
+                override fun write(buffer: ByteArray, size: Int) {
+                    offset += encryptedVolume.write(fileHandle, offset, buffer, 0, size.toLong())
+                }
+            })
+            val pendingRecording = videoRecorder!!.prepareRecording(
+                this,
+                MuxerOutputOptions(FFmpegMuxer(writer))
+            ).also {
+                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || ActivityCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED) {
+                    it.withAudioEnabled()
+                }
+            }
+            startTimerThen {
+                writer.start()
+                videoRecording = pendingRecording.start(executor) {
+                    val buttons = arrayOf(binding.imageCaptureMode, binding.imageRatio, binding.imageTimer, binding.imageModeSwitch, binding.imageCameraSwitch)
+                    when (it) {
+                        is VideoRecordEvent.Start -> {
+                            binding.recordVideoButton.setImageResource(R.drawable.stop_recording_video_button)
+                            for (i in buttons) {
+                                i.isEnabled = false
+                                i.alpha = 0.5F
+                            }
+                            isRecording = true
+                        }
+                        is VideoRecordEvent.Finalize -> {
+                            if (it.hasError()) {
+                                it.cause?.printStackTrace()
+                                Toast.makeText(applicationContext, it.cause?.message ?: ("Error: " + it.error), Toast.LENGTH_SHORT).show()
+                                videoRecording?.close()
+                                videoRecording = null
+                            } else {
+                                Toast.makeText(applicationContext, getString(R.string.video_save_success, path), Toast.LENGTH_SHORT).show()
+                            }
+                            binding.recordVideoButton.setImageResource(R.drawable.record_video_button)
+                            for (i in buttons) {
+                                i.isEnabled = true
+                                i.alpha = 1F
+                            }
+                            isRecording = false
+                        }
+                    }
+                }
+            }
         }
     }
 
     override fun onPause() {
         super.onPause()
         sensorOrientationListener.remove(this)
-        if (!isAskingPermissions && !usf_keep_open) {
-            finish()
-        }
     }
 
     override fun onResume() {
@@ -506,11 +588,6 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         sensorOrientationListener.addListener(this)
     }
 
-    override fun onBackPressed() {
-        super.onBackPressed()
-        isFinishingIntentionally = true
-    }
-
     override fun onOrientationChange(newOrientation: Int) {
         val realOrientation = when (newOrientation) {
             Surface.ROTATION_0 -> 0f
@@ -529,7 +606,8 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         orientedIcons.map { it.startAnimation(rotateAnimation) }
         previousOrientation = realOrientation
         imageCapture?.targetRotation = newOrientation
-        videoCapture?.setTargetRotation(newOrientation)
+        videoCapture?.targetRotation = newOrientation
+        currentRotation = newOrientation
     }
 }
 

app/src/main/java/sushi/hardcore/droidfs/ChangePasswordActivity.kt

@@ -1,29 +1,39 @@
 package sushi.hardcore.droidfs
 
 import android.annotation.SuppressLint
+import android.content.Context
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
 import android.view.MenuItem
 import android.view.View
+import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
 import androidx.lifecycle.lifecycleScope
 import sushi.hardcore.droidfs.databinding.ActivityChangePasswordBinding
+import sushi.hardcore.droidfs.filesystems.CryfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.util.IntentUtils
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.util.*
 
 class ChangePasswordActivity: BaseActivity() {
 
     private lateinit var binding: ActivityChangePasswordBinding
-    private lateinit var volume: SavedVolume
+    private lateinit var volume: VolumeData
     private lateinit var volumeDatabase: VolumeDatabase
     private var fingerprintProtector: FingerprintProtector? = null
     private var usfFingerprint: Boolean = false
+    private val inputMethodManager by lazy {
+        getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        volume = intent.getParcelableExtra("volume")!!
+        volume = IntentUtils.getParcelableExtra(intent, "volume")!!
         binding = ActivityChangePasswordBinding.inflate(layoutInflater)
         setContentView(binding.root)
         title = getString(R.string.change_password)
@@ -32,20 +42,33 @@ class ChangePasswordActivity: BaseActivity() {
         volumeDatabase = VolumeDatabase(this)
         usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            fingerprintProtector = FingerprintProtector.new(this, themeValue, volumeDatabase)
+            fingerprintProtector = FingerprintProtector.new(this, theme, volumeDatabase)
             if (fingerprintProtector != null && volume.encryptedHash != null) {
-                binding.textCurrentPasswordLabel.visibility = View.GONE
-                binding.editCurrentPassword.visibility = View.GONE
+                binding.fingerprintSwitchContainer.visibility = View.VISIBLE
             }
         }
         if (!usfFingerprint || fingerprintProtector == null) {
             binding.checkboxSavePassword.visibility = View.GONE
         }
-        if (sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false)) {
+        if (sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false)) {
             arrayOf(binding.editCurrentPassword, binding.editNewPassword, binding.editPasswordConfirm).forEach {
                 it.inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
             }
         }
+        binding.fingerprintSwitchContainer.setOnClickListener {
+            binding.switchUseFingerprint.toggle()
+        }
+        binding.switchUseFingerprint.setOnCheckedChangeListener { _, isChecked ->
+            if (isChecked && binding.editCurrentPassword.hasFocus()) {
+                binding.editCurrentPassword.clearFocus()
+                inputMethodManager.hideSoftInputFromWindow(binding.editCurrentPassword.windowToken, 0)
+            }
+        }
+        binding.editCurrentPassword.setOnFocusChangeListener { _, hasFocus ->
+            if (hasFocus) {
+                binding.switchUseFingerprint.isChecked = false
+            }
+        }
         binding.editPasswordConfirm.setOnEditorActionListener { _, _, _ ->
             changeVolumePassword()
             true
@@ -66,35 +89,35 @@ class ChangePasswordActivity: BaseActivity() {
     }
 
     private fun changeVolumePassword() {
-        val newPassword = CharArray(binding.editNewPassword.text.length)
-        binding.editNewPassword.text.getChars(0, newPassword.size, newPassword, 0)
-        val newPasswordConfirm = CharArray(binding.editPasswordConfirm.text.length)
-        binding.editPasswordConfirm.text.getChars(0, newPasswordConfirm.size, newPasswordConfirm, 0)
+        val newPassword = UIUtils.encodeEditTextContent(binding.editNewPassword)
+        val newPasswordConfirm = UIUtils.encodeEditTextContent(binding.editPasswordConfirm)
         @SuppressLint("NewApi")
         if (!newPassword.contentEquals(newPasswordConfirm)) {
             Toast.makeText(this, R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
-            Arrays.fill(newPassword, 0.toChar())
+            Arrays.fill(newPassword, 0)
         } else {
             var changeWithCurrentPassword = true
             volume.encryptedHash?.let { encryptedHash ->
                 volume.iv?.let { iv ->
                     fingerprintProtector?.let {
-                        changeWithCurrentPassword = false
-                        it.listener = object : FingerprintProtector.Listener {
-                            override fun onHashStorageReset() {
-                                showCurrentPasswordInput()
-                                volume.encryptedHash = null
-                                volume.iv = null
-                            }
-                            override fun onPasswordHashDecrypted(hash: ByteArray) {
-                                changeVolumePassword(newPassword, hash)
-                            }
-                            override fun onPasswordHashSaved() {}
-                            override fun onFailed(pending: Boolean) {
-                                Arrays.fill(newPassword, 0.toChar())
+                        if (binding.switchUseFingerprint.isChecked) {
+                            changeWithCurrentPassword = false
+                            it.listener = object : FingerprintProtector.Listener {
+                                override fun onHashStorageReset() {
+                                    showCurrentPasswordInput()
+                                    volume.encryptedHash = null
+                                    volume.iv = null
+                                }
+                                override fun onPasswordHashDecrypted(hash: ByteArray) {
+                                    changeVolumePassword(newPassword, hash)
+                                }
+                                override fun onPasswordHashSaved() {}
+                                override fun onFailed(pending: Boolean) {
+                                    Arrays.fill(newPassword, 0)
+                                }
                             }
+                            it.loadPasswordHash(volume.name, encryptedHash, iv)
                         }
-                        it.loadPasswordHash(volume.name, encryptedHash, iv)
                     }
                 }
             }
@@ -102,30 +125,48 @@ class ChangePasswordActivity: BaseActivity() {
                 changeVolumePassword(newPassword)
             }
         }
-        Arrays.fill(newPasswordConfirm, 0.toChar())
+        Arrays.fill(newPasswordConfirm, 0)
     }
 
-    private fun changeVolumePassword(newPassword: CharArray, givenHash: ByteArray? = null) {
-        var returnedHash: ByteArray? = null
-        if (binding.checkboxSavePassword.isChecked) {
-            returnedHash = ByteArray(GocryptfsVolume.KeyLen)
+    private fun changeVolumePassword(newPassword: ByteArray, givenHash: ByteArray? = null) {
+        val returnedHash: ObjRef<ByteArray?>? = if (binding.checkboxSavePassword.isChecked) {
+            ObjRef(null)
+        } else {
+            null
         }
-        var currentPassword: CharArray? = null
-        if (givenHash == null) {
-            currentPassword = CharArray(binding.editCurrentPassword.text.length)
-            binding.editCurrentPassword.text.getChars(0, currentPassword.size, currentPassword, 0)
+        val currentPassword = if (givenHash == null) {
+            UIUtils.encodeEditTextContent(binding.editCurrentPassword)
+        } else {
+            null
         }
-        object : LoadingTask<Boolean>(this, themeValue, R.string.loading_msg_change_password) {
+        object : LoadingTask<Boolean>(this, theme, R.string.loading_msg_change_password) {
             override suspend fun doTask(): Boolean {
-                val success = GocryptfsVolume.changePassword(volume.getFullPath(filesDir.path), currentPassword, givenHash, newPassword, returnedHash)
+                val success = if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE) {
+                    GocryptfsVolume.changePassword(
+                        volume.getFullPath(filesDir.path),
+                        currentPassword,
+                        givenHash,
+                        newPassword,
+                        returnedHash?.apply { value = ByteArray(GocryptfsVolume.KeyLen) }?.value
+                    )
+                } else {
+                    CryfsVolume.changePassword(
+                        volume.getFullPath(filesDir.path),
+                        filesDir.path,
+                        currentPassword,
+                        givenHash,
+                        newPassword,
+                        returnedHash
+                    )
+                }
                 if (success) {
-                    if (volumeDatabase.isHashSaved(volume.name)) {
+                    if (volumeDatabase.isHashSaved(volume)) {
                         volumeDatabase.removeHash(volume)
                     }
                 }
                 if (currentPassword != null)
-                    Arrays.fill(currentPassword, 0.toChar())
-                Arrays.fill(newPassword, 0.toChar())
+                    Arrays.fill(currentPassword, 0)
+                Arrays.fill(newPassword, 0)
                 if (givenHash != null)
                     Arrays.fill(givenHash, 0)
                 return success
@@ -138,27 +179,27 @@ class ChangePasswordActivity: BaseActivity() {
                         it.listener = object : FingerprintProtector.Listener {
                             override fun onHashStorageReset() {
                                 // retry
-                                it.savePasswordHash(volume, returnedHash)
+                                it.savePasswordHash(volume, returnedHash.value!!)
                             }
                             override fun onPasswordHashDecrypted(hash: ByteArray) {}
                             override fun onPasswordHashSaved() {
-                                Arrays.fill(returnedHash, 0)
+                                Arrays.fill(returnedHash.value!!, 0)
                                 finish()
                             }
                             override fun onFailed(pending: Boolean) {
                                 if (!pending) {
-                                    Arrays.fill(returnedHash, 0)
+                                    Arrays.fill(returnedHash.value!!, 0)
                                     finish()
                                 }
                             }
                         }
-                        it.savePasswordHash(volume, returnedHash)
+                        it.savePasswordHash(volume, returnedHash.value!!)
                     }
                 } else {
                     finish()
                 }
             } else {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.error)
                     .setMessage(R.string.change_password_failed)
                     .setPositiveButton(R.string.ok, null)
@@ -166,4 +207,11 @@ class ChangePasswordActivity: BaseActivity() {
             }
         }
     }
+
+    override fun onStop() {
+        super.onStop()
+        binding.editCurrentPassword.text.clear()
+        binding.editNewPassword.text.clear()
+        binding.editPasswordConfirm.text.clear()
+    }
 }

app/src/main/java/sushi/hardcore/droidfs/ClosingService.kt

@@ -0,0 +1,20 @@
+package sushi.hardcore.droidfs
+
+import android.app.Service
+import android.content.Intent
+
+/**
+ * Dummy background service listening for application task removal in order to
+ * close all volumes still open on quit.
+ *
+ * Should only be running when usfBackground is enabled AND usfKeepOpen is disabled.
+ */
+class ClosingService : Service() {
+    override fun onBind(intent: Intent) = null
+
+    override fun onTaskRemoved(rootIntent: Intent) {
+        super.onTaskRemoved(rootIntent)
+        (application as VolumeManagerApp).volumeManager.closeAll()
+        stopSelf()
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/ConstValues.kt

@@ -1,47 +0,0 @@
-package sushi.hardcore.droidfs
-
-import android.net.Uri
-import java.io.File
-
-object ConstValues {
-    const val CREATOR = "DroidFS"
-    const val VOLUME_DATABASE_NAME = "SavedVolumes"
-    const val CRYFS_LOCAL_STATE_DIR = "cryfsLocalState"
-    const val SORT_ORDER_KEY = "sort_order"
-    val FAKE_URI: Uri = Uri.parse("fakeuri://droidfs")
-    const val MAX_KERNEL_WRITE = 128*1024
-    const val WIPE_PASSES = 2
-    const val IO_BUFF_SIZE = 16384
-    const val SLIDESHOW_DELAY: Long = 4000
-    const val DEFAULT_THEME_VALUE = "dark_green"
-    const val THUMBNAIL_MAX_SIZE_KEY = "thumbnail_max_size"
-    const val DEFAULT_THUMBNAIL_MAX_SIZE = 10_000L
-    const val PIN_PASSWORDS_KEY = "pin_passwords"
-    private val FILE_EXTENSIONS = mapOf(
-        Pair("image", listOf("png", "jpg", "jpeg", "gif", "webp", "bmp", "heic")),
-        Pair("video", listOf("mp4", "webm", "mkv", "mov")),
-        Pair("audio", listOf("mp3", "ogg", "m4a", "wav", "flac")),
-        Pair("pdf", listOf("pdf")),
-        Pair("text", listOf("txt", "json", "conf", "log", "xml", "java", "kt", "py", "pl", "rb", "go", "c", "h", "cpp", "hpp", "rs", "sh", "bat", "js", "html", "css", "php", "yml", "yaml", "toml", "ini", "md", "properties"))
-    )
-
-    fun isExtensionType(extensionType: String, path: String): Boolean {
-        return FILE_EXTENSIONS[extensionType]?.contains(File(path).extension.lowercase()) ?: false
-    }
-
-    fun isImage(path: String): Boolean {
-        return isExtensionType("image", path)
-    }
-    fun isVideo(path: String): Boolean {
-        return isExtensionType("video", path)
-    }
-    fun isAudio(path: String): Boolean {
-        return isExtensionType("audio", path)
-    }
-    fun isPDF(path: String): Boolean {
-        return isExtensionType("pdf", path)
-    }
-    fun isText(path: String): Boolean {
-        return isExtensionType("text", path)
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/Constants.kt

@@ -0,0 +1,19 @@
+package sushi.hardcore.droidfs
+
+import android.net.Uri
+
+object Constants {
+    const val VOLUME_DATABASE_NAME = "SavedVolumes"
+    const val CRYFS_LOCAL_STATE_DIR = "cryfsLocalState"
+    const val SORT_ORDER_KEY = "sort_order"
+    val FAKE_URI: Uri = Uri.parse("fakeuri://droidfs")
+    const val WIPE_PASSES = 2
+    const val IO_BUFF_SIZE = 16384
+    const val SLIDESHOW_DELAY: Long = 4000
+    const val DEFAULT_THEME_VALUE = "dark_green"
+    const val DEFAULT_VOLUME_KEY = "default_volume"
+    const val REMEMBER_VOLUME_KEY = "remember_volume"
+    const val THUMBNAIL_MAX_SIZE_KEY = "thumbnail_max_size"
+    const val DEFAULT_THUMBNAIL_MAX_SIZE = 10_000L
+    const val PIN_PASSWORDS_KEY = "pin_passwords"
+}

app/src/main/java/sushi/hardcore/droidfs/EncryptedFileProvider.kt

@@ -0,0 +1,250 @@
+package sushi.hardcore.droidfs
+
+import android.app.ActivityManager
+import android.content.Context
+import android.os.Build
+import android.os.Handler
+import android.os.ParcelFileDescriptor
+import android.system.Os
+import android.util.Log
+import androidx.preference.PreferenceManager
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.Compat
+import sushi.hardcore.droidfs.util.Wiper
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.InputStream
+import java.util.UUID
+
+class EncryptedFileProvider(context: Context) {
+    companion object {
+        private const val TAG = "EncryptedFileProvider"
+        fun getTmpFilesDir(context: Context) = File(context.cacheDir, "tmp")
+
+        var exportMethod = ExportMethod.AUTO
+    }
+
+    enum class ExportMethod {
+        AUTO,
+        DISK,
+        MEMORY;
+
+        companion object {
+            fun parse(value: String) = when (value) {
+                "auto" -> EncryptedFileProvider.ExportMethod.AUTO
+                "disk" -> EncryptedFileProvider.ExportMethod.DISK
+                "memory" -> EncryptedFileProvider.ExportMethod.MEMORY
+                else -> throw IllegalArgumentException("Invalid export method: $value")
+            }
+        }
+    }
+
+    private val memoryInfo = ActivityManager.MemoryInfo()
+    private val isMemFileSupported = Compat.isMemFileSupported()
+    private val tmpFilesDir by lazy { getTmpFilesDir(context) }
+    private val handler by lazy { Handler(context.mainLooper) }
+
+    init {
+        (context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager).getMemoryInfo(
+            memoryInfo
+        )
+
+        PreferenceManager.getDefaultSharedPreferences(context)
+            .getString("export_method", null)?.let {
+                exportMethod = ExportMethod.parse(it)
+            }
+    }
+
+    class ExportedDiskFile private constructor(
+        path: String,
+        private val file: File,
+        private val handler: Handler
+    ) : ExportedFile(path) {
+        companion object {
+            fun create(path: String, tmpFilesDir: File, handler: Handler): ExportedDiskFile? {
+                val uuid = UUID.randomUUID().toString()
+                val file = File(tmpFilesDir, uuid)
+                return if (file.createNewFile()) {
+                    ExportedDiskFile(path, file, handler)
+                } else {
+                    null
+                }
+            }
+        }
+
+        override fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor {
+            return if (furtive) {
+                ParcelFileDescriptor.open(file, mode, handler) {
+                    free()
+                }
+            } else {
+                ParcelFileDescriptor.open(file, mode)
+            }
+        }
+
+        override fun free() {
+            Wiper.wipe(file)
+        }
+    }
+
+    class ExportedMemFile private constructor(path: String, private val file: MemFile) :
+        ExportedFile(path) {
+        companion object {
+            fun create(path: String, size: Long): ExportedMemFile? {
+                val uuid = UUID.randomUUID().toString()
+                MemFile.create(uuid, size)?.let {
+                    return ExportedMemFile(path, it)
+                }
+                return null
+            }
+        }
+
+        override fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor {
+            val fd = if (furtive) {
+                file.toParcelFileDescriptor()
+            } else {
+                file.dup()
+            }
+            if (mode and ParcelFileDescriptor.MODE_TRUNCATE != 0) {
+                Os.ftruncate(fd.fileDescriptor, 0)
+            } else {
+                FileInputStream(fd.fileDescriptor).apply {
+                    channel.position(0)
+                    close()
+                }
+            }
+            return fd
+        }
+
+        override fun free() = file.close()
+    }
+
+    abstract class ExportedFile(val path: String) {
+        var isValid = true
+            private set
+
+        fun invalidate() {
+            isValid = false
+        }
+
+        /**
+         * @param furtive If set to true, the file will be deleted when closed
+         */
+        abstract fun open(mode: Int, furtive: Boolean): ParcelFileDescriptor
+        abstract fun free()
+    }
+
+    fun createFile(
+        path: String,
+        size: Long,
+    ): ExportedFile? {
+        val diskFile by lazy { ExportedDiskFile.create(path, tmpFilesDir, handler) }
+        val memFile by lazy { ExportedMemFile.create(path, size) }
+        return when (exportMethod) {
+            ExportMethod.MEMORY -> memFile
+            ExportMethod.DISK -> diskFile
+            ExportMethod.AUTO -> {
+                if (isMemFileSupported && size < memoryInfo.availMem * 0.8) {
+                    memFile
+                } else {
+                    diskFile
+                }
+            }
+        }
+    }
+
+    fun exportFile(
+        exportedFile: ExportedFile,
+        encryptedVolume: EncryptedVolume,
+    ): Boolean {
+        val fd = exportedFile.open(ParcelFileDescriptor.MODE_WRITE_ONLY, false).fileDescriptor
+        return encryptedVolume.exportFile(exportedFile.path, FileOutputStream(fd))
+    }
+
+    enum class Error {
+        SUCCESS,
+        INVALID_STATE,
+        WRITE_ACCESS_DENIED,
+        UNSUPPORTED_APPEND,
+        UNSUPPORTED_RW,
+        ;
+
+        fun log() {
+            Log.e(
+                TAG, when (this) {
+                    SUCCESS -> "No error"
+                    INVALID_STATE -> "Read after write is not supported"
+                    WRITE_ACCESS_DENIED -> "Write access unauthorized"
+                    UNSUPPORTED_APPEND -> "Appending is not supported"
+                    UNSUPPORTED_RW -> "Read-write access requires Android 11 or later"
+                }
+            )
+        }
+    }
+
+    /**
+     * @param furtive If set to true, the file will be deleted when closed
+     */
+    fun openFile(
+        file: ExportedFile,
+        mode: String,
+        encryptedVolume: EncryptedVolume,
+        volumeScope: CoroutineScope,
+        furtive: Boolean,
+        allowWrites: Boolean,
+    ): Pair<ParcelFileDescriptor?, Error> {
+        val mode = ParcelFileDescriptor.parseMode(mode)
+        return if (mode and ParcelFileDescriptor.MODE_READ_ONLY != 0) {
+            if (!file.isValid) return Pair(null, Error.INVALID_STATE)
+            Pair(file.open(mode, furtive), Error.SUCCESS)
+        } else {
+            if (!allowWrites) {
+                return Pair(null, Error.WRITE_ACCESS_DENIED)
+            }
+
+            fun import(input: InputStream): Boolean {
+                return if (encryptedVolume.importFile(input, file.path)) {
+                    true
+                } else {
+                    Log.e(TAG, "Failed to import file")
+                    false
+                }
+            }
+
+            if (mode and ParcelFileDescriptor.MODE_WRITE_ONLY != 0) {
+                if (mode and ParcelFileDescriptor.MODE_APPEND != 0) {
+                    return Pair(null, Error.UNSUPPORTED_APPEND)
+                }
+                if (mode and ParcelFileDescriptor.MODE_TRUNCATE == 0) {
+                    Log.w(TAG, "Truncating file despite not being requested")
+                }
+                val pipe = ParcelFileDescriptor.createReliablePipe()
+                val input = FileInputStream(pipe[0].fileDescriptor)
+                volumeScope.launch {
+                    if (import(input)) {
+                        file.invalidate()
+                    }
+                }
+                Pair(pipe[1], Error.SUCCESS)
+            } else { // read-write
+                if (!file.isValid) return Pair(null, Error.INVALID_STATE)
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                    val fd = file.open(mode, false)
+                    Pair(ParcelFileDescriptor.wrap(fd, handler) { e ->
+                        if (e == null) {
+                            import(FileInputStream(fd.fileDescriptor))
+                            if (furtive) {
+                                file.free()
+                            }
+                        }
+                    }, Error.SUCCESS)
+                } else {
+                    Pair(null, Error.UNSUPPORTED_RW)
+                }
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FileShare.kt

@@ -0,0 +1,78 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.webkit.MimeTypeMap
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
+import java.io.File
+
+class FileShare(context: Context) {
+    companion object {
+        private const val CONTENT_TYPE_ANY = "*/*"
+        private fun getContentType(filename: String, previousContentType: String?): String {
+            if (CONTENT_TYPE_ANY != previousContentType) {
+                var contentType = MimeTypeMap.getSingleton()
+                    .getMimeTypeFromExtension(File(filename).extension)
+                if (contentType == null) {
+                    contentType = CONTENT_TYPE_ANY
+                }
+                if (previousContentType == null) {
+                    return contentType
+                } else if (previousContentType != contentType) {
+                    return CONTENT_TYPE_ANY
+                }
+            }
+            return previousContentType
+        }
+    }
+
+    private val usfSafWrite = PreferenceManager.getDefaultSharedPreferences(context).getBoolean("usf_saf_write", false)
+
+    private fun exportFile(exportedFile: EncryptedFileProvider.ExportedFile, size: Long, volumeId: Int, previousContentType: String? = null): Pair<Uri, String>? {
+        val uri = TemporaryFileProvider.instance.exportFile(exportedFile, size, volumeId) ?: return null
+        return Pair(uri, getContentType(File(exportedFile.path).name, previousContentType))
+    }
+
+    fun share(files: List<Pair<String, Long>>, volumeId: Int): Pair<Intent?, Int?> {
+        var contentType: String? = null
+        val uris = ArrayList<Uri>(files.size)
+        for ((path, size) in files) {
+            val exportedFile = TemporaryFileProvider.instance.encryptedFileProvider.createFile(path, size)
+                ?: return Pair(null, R.string.export_failed_create)
+            val result = exportFile(exportedFile, size, volumeId, contentType)
+            contentType = if (result == null) {
+                return Pair(null, R.string.export_failed_export)
+            } else {
+                uris.add(result.first)
+                result.second
+            }
+        }
+        return Pair(Intent().apply {
+            type = contentType
+            if (uris.size == 1) {
+                action = Intent.ACTION_SEND
+                putExtra(Intent.EXTRA_STREAM, uris[0])
+            } else {
+                action = Intent.ACTION_SEND_MULTIPLE
+                putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris)
+            }
+        }, null)
+    }
+
+    fun openWith(exportedFile: EncryptedFileProvider.ExportedFile, size: Long, volumeId: Int): Pair<Intent?, Int?> {
+        val result = exportFile(exportedFile, size, volumeId)
+        return if (result == null) {
+            Pair(null, R.string.export_failed_export)
+        } else {
+            Pair(Intent(Intent.ACTION_VIEW).apply {
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                if (usfSafWrite) {
+                    addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+                }
+                setDataAndType(result.first, result.second)
+            }, null)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FileTypes.kt

@@ -0,0 +1,87 @@
+package sushi.hardcore.droidfs
+
+import java.io.File
+
+object FileTypes {
+    private val FILE_EXTENSIONS = mapOf(
+        Pair("image", listOf("png", "jpg", "jpeg", "gif", "avif", "webp", "bmp", "heic")),
+        Pair("video", listOf("mp4", "webm", "mkv", "mov", "m4v")),
+        Pair("audio", listOf("mp3", "ogg", "m4a", "wav", "flac", "opus")),
+        Pair("pdf", listOf("pdf")),
+        Pair("text", listOf(
+            "asc",
+            "asm",
+            "awk",
+            "bash",
+            "c",
+            "cfg",
+            "conf",
+            "cpp",
+            "css",
+            "csv",
+            "desktop",
+            "dot",
+            "g4",
+            "go",
+            "gradle",
+            "h",
+            "hpp",
+            "hs",
+            "html",
+            "ini",
+            "java",
+            "js",
+            "json",
+            "kt",
+            "lisp",
+            "log",
+            "lua",
+            "markdown",
+            "md",
+            "mod",
+            "org",
+            "php",
+            "pl",
+            "pro",
+            "properties",
+            "py",
+            "qml",
+            "rb",
+            "rc",
+            "rs",
+            "sh",
+            "smali",
+            "sql",
+            "srt",
+            "tex",
+            "toml",
+            "ts",
+            "txt",
+            "vala",
+            "vim",
+            "xml",
+            "yaml",
+            "yml",
+        ))
+    )
+
+    fun isExtensionType(extensionType: String, path: String): Boolean {
+        return FILE_EXTENSIONS[extensionType]?.contains(File(path).extension.lowercase()) ?: false
+    }
+
+    fun isImage(path: String): Boolean {
+        return isExtensionType("image", path)
+    }
+    fun isVideo(path: String): Boolean {
+        return isExtensionType("video", path)
+    }
+    fun isAudio(path: String): Boolean {
+        return isExtensionType("audio", path)
+    }
+    fun isPDF(path: String): Boolean {
+        return isExtensionType("pdf", path)
+    }
+    fun isText(path: String): Boolean {
+        return isExtensionType("text", path)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/FingerprintProtector.kt

@@ -22,7 +22,7 @@ import javax.crypto.spec.GCMParameterSpec
 @RequiresApi(Build.VERSION_CODES.M)
 class FingerprintProtector private constructor(
     private val activity: FragmentActivity,
-    private val themeValue: String,
+    private val theme: Theme,
     private val volumeDatabase: VolumeDatabase,
 ) {
 
@@ -54,11 +54,11 @@ class FingerprintProtector private constructor(
 
         fun new(
             activity: FragmentActivity,
-            themeValue: String,
+            theme: Theme,
             volumeDatabase: VolumeDatabase,
         ): FingerprintProtector? {
             return if (canAuthenticate(activity) == 0)
-                FingerprintProtector(activity, themeValue, volumeDatabase)
+                FingerprintProtector(activity, theme, volumeDatabase)
             else
                 null
         }
@@ -98,7 +98,7 @@ class FingerprintProtector private constructor(
                                 listener.onPasswordHashDecrypted(plainText)
                             } catch (e: AEADBadTagException) {
                                 listener.onFailed(true)
-                                CustomAlertDialogBuilder(activity, themeValue)
+                                CustomAlertDialogBuilder(activity, theme)
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.MAC_verification_failed)
                                     .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -112,7 +112,7 @@ class FingerprintProtector private constructor(
                     }
                 } catch (e: IllegalBlockSizeException) {
                     listener.onFailed(true)
-                    CustomAlertDialogBuilder(activity, themeValue)
+                    CustomAlertDialogBuilder(activity, theme)
                         .setTitle(R.string.illegal_block_size_exception)
                         .setMessage(R.string.illegal_block_size_exception_msg)
                         .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -133,7 +133,7 @@ class FingerprintProtector private constructor(
     private lateinit var cipher: Cipher
     private var isCipherReady = false
     private var cipherActionMode: Int? = null
-    private lateinit var volume: SavedVolume
+    private lateinit var volume: VolumeData
     private lateinit var dataToProcess: ByteArray
 
     private fun resetHashStorage() {
@@ -159,7 +159,7 @@ class FingerprintProtector private constructor(
                     keyStore.getKey(KEY_ALIAS, null) as SecretKey
                 } catch (e: UnrecoverableKeyException) {
                     listener.onFailed(true)
-                    CustomAlertDialogBuilder(activity, themeValue)
+                    CustomAlertDialogBuilder(activity, theme)
                         .setTitle(activity.getString(R.string.unrecoverable_key_exception))
                         .setMessage(activity.getString(R.string.unrecoverable_key_exception_msg, e.localizedMessage))
                         .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -196,7 +196,7 @@ class FingerprintProtector private constructor(
 
     private fun alertKeyPermanentlyInvalidatedException() {
         listener.onFailed(true)
-        CustomAlertDialogBuilder(activity, themeValue)
+        CustomAlertDialogBuilder(activity, theme)
             .setTitle(R.string.key_permanently_invalidated_exception)
             .setMessage(R.string.key_permanently_invalidated_exception_msg)
             .setPositiveButton(R.string.reset_hash_storage) { _, _ ->
@@ -207,7 +207,7 @@ class FingerprintProtector private constructor(
             .show()
     }
 
-    fun savePasswordHash(volume: SavedVolume, plainText: ByteArray) {
+    fun savePasswordHash(volume: VolumeData, plainText: ByteArray) {
         this.volume = volume
         val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()
             .setTitle(activity.getString(R.string.encrypt_action_description))

app/src/main/java/sushi/hardcore/droidfs/KeepAliveService.kt

@@ -0,0 +1,120 @@
+package sushi.hardcore.droidfs
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Intent
+import android.content.pm.ServiceInfo
+import android.os.Build
+import android.os.Parcel
+import android.os.Parcelable
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.core.app.ServiceCompat
+import androidx.core.content.IntentCompat
+
+class KeepAliveService: Service() {
+    internal class NotificationDetails(
+        val channel: String,
+        val title: String,
+        val text: String,
+        val action: NotificationAction,
+    ) : Parcelable {
+        internal class NotificationAction(
+            val icon: Int,
+            val title: String,
+            val action: String,
+        )
+
+        constructor(parcel: Parcel) : this(
+            parcel.readString()!!,
+            parcel.readString()!!,
+            parcel.readString()!!,
+            NotificationAction(
+                parcel.readInt(),
+                parcel.readString()!!,
+                parcel.readString()!!,
+            )
+        )
+
+        override fun writeToParcel(parcel: Parcel, flags: Int) {
+            with (parcel) {
+                writeString(channel)
+                writeString(title)
+                writeString(text)
+                writeInt(action.icon)
+                writeString(action.title)
+                writeString(action.action)
+            }
+        }
+
+        override fun describeContents() = 0
+
+        companion object CREATOR : Parcelable.Creator<NotificationDetails> {
+            override fun createFromParcel(parcel: Parcel) = NotificationDetails(parcel)
+            override fun newArray(size: Int) = arrayOfNulls<NotificationDetails>(size)
+        }
+
+    }
+
+    companion object {
+        const val ACTION_START = "start"
+
+        /**
+         * If [startForeground] is called before notification permission is granted,
+         * the notification won't appear.
+         *
+         * This action can be used once the permission is granted, to make the service
+         * call [startForeground] again in order to properly show the notification.
+         */
+        const val ACTION_FOREGROUND = "foreground"
+        const val NOTIFICATION_CHANNEL_ID = "KeepAlive"
+    }
+
+    private val notificationManager by lazy {
+        NotificationManagerCompat.from(this)
+    }
+    private var notification: Notification? = null
+
+    override fun onBind(intent: Intent?) = null
+
+    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
+        if (intent.action == ACTION_START) {
+            val notificationDetails = IntentCompat.getParcelableExtra(intent, "notification", NotificationDetails::class.java)!!
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                notificationManager.createNotificationChannel(
+                    NotificationChannel(
+                        NOTIFICATION_CHANNEL_ID,
+                        notificationDetails.channel,
+                        NotificationManager.IMPORTANCE_LOW
+                    )
+                )
+            }
+            notification = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
+                .setSmallIcon(R.drawable.ic_notification)
+                .setContentTitle(notificationDetails.title)
+                .setContentText(notificationDetails.text)
+                .addAction(NotificationCompat.Action(
+                    notificationDetails.action.icon,
+                    notificationDetails.action.title,
+                    PendingIntent.getBroadcast(
+                        this,
+                        0,
+                        Intent(this, NotificationBroadcastReceiver::class.java).apply {
+                            action = notificationDetails.action.action
+                        },
+                        PendingIntent.FLAG_IMMUTABLE
+                    )
+                ))
+                .build()
+        }
+        ServiceCompat.startForeground(this, startId, notification!!, if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC // is there a better use case flag?
+        } else {
+            0
+        })
+        return START_NOT_STICKY
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/LoadingTask.kt

@@ -1,6 +1,6 @@
 package sushi.hardcore.droidfs
 
-import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentActivity
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -8,8 +8,8 @@ import kotlinx.coroutines.withContext
 import sushi.hardcore.droidfs.databinding.DialogLoadingBinding
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 
-abstract class LoadingTask<T>(val activity: AppCompatActivity, themeValue: String, loadingMessageResId: Int) {
-    private val dialogLoading = CustomAlertDialogBuilder(activity, themeValue)
+abstract class LoadingTask<T>(val activity: FragmentActivity, theme: Theme, loadingMessageResId: Int) {
+    private val dialogLoading = CustomAlertDialogBuilder(activity, theme)
         .setView(
             DialogLoadingBinding.inflate(activity.layoutInflater).apply {
                 textMessage.text = activity.getString(loadingMessageResId)

app/src/main/java/sushi/hardcore/droidfs/LogcatActivity.kt

@@ -0,0 +1,88 @@
+package sushi.hardcore.droidfs
+
+import android.net.Uri
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.databinding.ActivityLogcatBinding
+import java.io.BufferedReader
+import java.io.BufferedWriter
+import java.io.InputStreamReader
+import java.io.InterruptedIOException
+import java.io.OutputStreamWriter
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+class LogcatActivity: BaseActivity() {
+    private lateinit var binding: ActivityLogcatBinding
+    private var process: Process? = null
+    private val dateFormat by lazy {
+        SimpleDateFormat("yyyy-MM-dd_HH:mm:ss", Locale.getDefault())
+    }
+    private val saveAs = registerForActivityResult(ActivityResultContracts.CreateDocument("text/*")) { uri ->
+        uri?.let {
+            saveTo(it)
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityLogcatBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+        title = getString(R.string.logcat_title)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+
+        lifecycleScope.launch(Dispatchers.IO) {
+            try {
+                BufferedReader(InputStreamReader(Runtime.getRuntime().exec("logcat").also {
+                    process = it
+                }.inputStream)).forEachLine {
+                    binding.content.post {
+                        binding.content.append("$it\n")
+                    }
+                }
+            } catch (_: InterruptedIOException) {}
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        process?.destroy()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.logcat, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        return when (item.itemId) {
+            android.R.id.home -> {
+                finish()
+                true
+            }
+            R.id.save -> {
+                saveAs.launch("DroidFS_${dateFormat.format(Date())}.log")
+                true
+            }
+            else -> super.onOptionsItemSelected(item)
+        }
+    }
+
+    private fun saveTo(uri: Uri) {
+        lifecycleScope.launch(Dispatchers.IO) {
+            BufferedWriter(OutputStreamWriter(contentResolver.openOutputStream(uri))).use {
+                it.write(binding.content.text.toString())
+            }
+            launch(Dispatchers.Main) {
+                Toast.makeText(this@LogcatActivity, R.string.logcat_saved, Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/MainActivity.kt

@@ -1,85 +1,67 @@
 package sushi.hardcore.droidfs
 
-import android.annotation.SuppressLint
-import android.content.ComponentName
-import android.content.Context
 import android.content.Intent
-import android.content.ServiceConnection
 import android.net.Uri
-import android.os.Build
 import android.os.Bundle
-import android.os.IBinder
-import android.text.InputType
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
-import android.view.WindowManager
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.Constants.DEFAULT_VOLUME_KEY
 import sushi.hardcore.droidfs.adapters.VolumeAdapter
 import sushi.hardcore.droidfs.add_volume.AddVolumeActivity
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
 import sushi.hardcore.droidfs.databinding.ActivityMainBinding
 import sushi.hardcore.droidfs.databinding.DialogDeleteVolumeBinding
-import sushi.hardcore.droidfs.databinding.DialogOpenVolumeBinding
-import sushi.hardcore.droidfs.explorers.ExplorerActivity
-import sushi.hardcore.droidfs.explorers.ExplorerActivityDrop
-import sushi.hardcore.droidfs.explorers.ExplorerActivityPick
+import sushi.hardcore.droidfs.explorers.ExplorerRouter
 import sushi.hardcore.droidfs.file_operations.FileOperationService
-import sushi.hardcore.droidfs.filesystems.EncryptedVolume
-import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.file_operations.TaskResult
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
-import sushi.hardcore.droidfs.util.WidgetUtil
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 import java.io.File
-import java.util.*
 
 class MainActivity : BaseActivity(), VolumeAdapter.Listener {
-
     companion object {
-        const val DEFAULT_VOLUME_KEY = "default_volume"
+        private const val OPEN_DEFAULT_VOLUME = "openDefault"
     }
 
     private lateinit var binding: ActivityMainBinding
     private lateinit var volumeDatabase: VolumeDatabase
+    private lateinit var volumeManager: VolumeManager
     private lateinit var volumeAdapter: VolumeAdapter
-    private var fingerprintProtector: FingerprintProtector? = null
-    private var usfFingerprint: Boolean = false
-    private var usfKeepOpen: Boolean = false
-    private var defaultVolumeName: String? = null
+    private lateinit var volumeOpener: VolumeOpener
     private var addVolume = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-        when (result.resultCode) {
-            AddVolumeActivity.RESULT_VOLUME_ADDED -> onVolumeAdded()
-            AddVolumeActivity.RESULT_HASH_STORAGE_RESET -> {
-                volumeAdapter.refresh()
-                binding.textNoVolumes.visibility = View.GONE
-            }
+        if ((explorerRouter.pickMode || explorerRouter.dropMode) && result.resultCode != AddVolumeActivity.RESULT_USER_BACK) {
+            setResult(result.resultCode, result.data) // forward result
+            finish()
         }
     }
-    private var changePasswordPosition: Int? = null
+    private var selectedVolumePosition: Int? = null
     private var changePassword = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
-        changePasswordPosition?.let { unselect(it) }
+        selectedVolumePosition?.let { unselect(it) }
     }
     private val pickDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri ->
         if (uri != null)
             onDirectoryPicked(uri)
     }
     private lateinit var fileOperationService: FileOperationService
-    private var pickMode = false
-    private var dropMode = false
-    private var shouldCloseVolume = true // used when launched to pick file from another volume
+    private lateinit var explorerRouter: ExplorerRouter
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
         if (sharedPrefs.getBoolean("applicationFirstOpening", true)) {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
                 .setMessage(R.string.usf_home_warning_msg)
                 .setCancelable(false)
@@ -97,14 +79,15 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 }
                 .show()
         }
-        pickMode = intent.action == "pick"
-        dropMode = (intent.action == Intent.ACTION_SEND || intent.action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null
+        explorerRouter = ExplorerRouter(this, intent)
+        volumeManager = (application as VolumeManagerApp).volumeManager
         volumeDatabase = VolumeDatabase(this)
         volumeAdapter = VolumeAdapter(
             this,
             volumeDatabase,
-            !pickMode && !dropMode,
-            !dropMode,
+            (application as VolumeManagerApp).volumeManager,
+            !explorerRouter.pickMode && !explorerRouter.dropMode,
+            !explorerRouter.dropMode,
             this,
         )
         binding.recyclerViewVolumes.adapter = volumeAdapter
@@ -112,42 +95,63 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         if (volumeAdapter.volumes.isEmpty()) {
             binding.textNoVolumes.visibility = View.VISIBLE
         }
-        if (pickMode) {
+        if (explorerRouter.pickMode) {
             title = getString(R.string.select_volume)
-            binding.fab.visibility = View.GONE
-        } else {
-            binding.fab.setOnClickListener {
-                addVolume.launch(Intent(this, AddVolumeActivity::class.java))
-            }
         }
-        usfKeepOpen = sharedPrefs.getBoolean("usf_keep_open", false)
-        usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            fingerprintProtector = FingerprintProtector.new(this, themeValue, volumeDatabase)
-        }
-        defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
-        defaultVolumeName?.let { name ->
-            try {
-                val (position, volume) = volumeAdapter.volumes.withIndex().first { it.value.name == name }
-                openVolume(volume, position)
-            } catch (e: NoSuchElementException) {
-                unsetDefaultVolume()
-            }
-        }
-        Intent(this, FileOperationService::class.java).also {
-            bindService(it, object : ServiceConnection {
-                override fun onServiceConnected(className: ComponentName, service: IBinder) {
-                    fileOperationService = (service as FileOperationService.LocalBinder).getService()
+        binding.fab.setOnClickListener {
+            addVolume.launch(Intent(this, AddVolumeActivity::class.java).also {
+                if (explorerRouter.dropMode || explorerRouter.pickMode) {
+                    IntentUtils.forwardIntent(intent, it)
                 }
-                override fun onServiceDisconnected(arg0: ComponentName) {}
-            }, Context.BIND_AUTO_CREATE)
+            })
+        }
+        volumeOpener = VolumeOpener(this)
+        onBackPressedDispatcher.addCallback(this) {
+            if (volumeAdapter.selectedItems.isNotEmpty()) {
+                unselectAll()
+            } else {
+                isEnabled = false
+                onBackPressedDispatcher.onBackPressed()
+            }
+        }
+        volumeOpener.defaultVolumeName?.let { name ->
+            val state = savedInstanceState?.getBoolean(OPEN_DEFAULT_VOLUME)
+            if (state == true || state == null) {
+                try {
+                    val volumeData = volumeAdapter.volumes.first { it.name == name }
+                    if (!volumeManager.isOpen(volumeData)) {
+                        openVolume(volumeData)
+                    }
+                } catch (e: NoSuchElementException) {
+                    unsetDefaultVolume()
+                }
+            }
+        }
+        FileOperationService.bind(this) {
+            fileOperationService = it
         }
     }
 
     override fun onStart() {
         super.onStart()
-        // refresh this in case another instance of MainActivity changes its value
-        defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+        // check if theme was changed (by SettingsActivity)
+        val newTheme = Theme.fromSharedPrefs(sharedPrefs)
+        if (newTheme != theme) {
+            recreate()
+        } else {
+            volumeAdapter.refresh()
+            invalidateOptionsMenu()
+            if (volumeAdapter.volumes.isNotEmpty()) {
+                binding.textNoVolumes.visibility = View.GONE
+            }
+            // refresh this in case another instance of MainActivity changes its value
+            volumeOpener.defaultVolumeName = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        outState.putBoolean(OPEN_DEFAULT_VOLUME, false)
     }
 
     override fun onSelectionChanged(size: Int) {
@@ -158,9 +162,9 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    override fun onVolumeItemClick(volume: SavedVolume, position: Int) {
+    override fun onVolumeItemClick(volume: VolumeData, position: Int) {
         if (volumeAdapter.selectedItems.isEmpty())
-            openVolume(volume, position)
+            openVolume(volume)
         else
             invalidateOptionsMenu()
     }
@@ -169,27 +173,22 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         invalidateOptionsMenu()
     }
 
-    private fun onVolumeAdded() {
-        volumeAdapter.apply {
-            volumes = volumeDatabase.getVolumes()
-            notifyItemInserted(volumes.size)
-        }
-        binding.textNoVolumes.visibility = View.GONE
-    }
-
     private fun unselectAll(notifyChange: Boolean = true) {
         volumeAdapter.unSelectAll(notifyChange)
         invalidateOptionsMenu()
     }
 
     private fun unselect(position: Int) {
-        volumeAdapter.selectedItems.remove(position)
-        volumeAdapter.onVolumeChanged(position)
-        onSelectionChanged(0) // unselect() is always called when only one element is selected
+        volumeAdapter.unselect(position)
         invalidateOptionsMenu()
     }
 
-    private fun removeVolumes(volumes: List<SavedVolume>, i: Int = 0, doDeleteVolumeContent: Boolean? = null) {
+    private fun removeVolume(volume: VolumeData) {
+        volumeManager.getVolumeId(volume)?.let { volumeManager.closeVolume(it) }
+        volumeDatabase.removeVolume(volume)
+    }
+
+    private fun removeVolumes(volumes: List<VolumeData>, i: Int = 0, doDeleteVolumeContent: Boolean? = null) {
         if (i < volumes.size) {
             if (volumes[i].isHidden) {
                 if (doDeleteVolumeContent == null) {
@@ -202,16 +201,16 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                             break
                         }
                     }
-                    CustomAlertDialogBuilder(this, themeValue)
+                    CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.warning)
                         .setView(dialogBinding.root)
                         .setPositiveButton(R.string.forget_only) { _, _ ->
-                            volumeDatabase.removeVolume(volumes[i].name)
+                            removeVolume(volumes[i])
                             removeVolumes(volumes, i + 1, if (dialogBinding.checkboxApplyToAll.isChecked) false else null)
                         }
                         .setNegativeButton(R.string.delete_volume) { _, _ ->
                             PathUtils.recursiveRemoveDirectory(File(volumes[i].getFullPath(filesDir.path)))
-                            volumeDatabase.removeVolume(volumes[i].name)
+                            removeVolume(volumes[i])
                             removeVolumes(volumes, i + 1, if (dialogBinding.checkboxApplyToAll.isChecked) true else null)
                         }
                         .setOnCancelListener {
@@ -223,11 +222,11 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                     if (doDeleteVolumeContent) {
                         PathUtils.recursiveRemoveDirectory(File(volumes[i].getFullPath(filesDir.path)))
                     }
-                    volumeDatabase.removeVolume(volumes[i].name)
+                    removeVolume(volumes[i])
                     removeVolumes(volumes, i + 1, doDeleteVolumeContent)
                 }
             } else {
-                volumeDatabase.removeVolume(volumes[i].name)
+                removeVolume(volumes[i])
                 removeVolumes(volumes, i + 1, doDeleteVolumeContent)
             }
         } else {
@@ -244,15 +243,13 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
             remove(DEFAULT_VOLUME_KEY)
             apply()
         }
-        defaultVolumeName = null
+        volumeOpener.defaultVolumeName = null
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId) {
             android.R.id.home -> {
-                if (pickMode || dropMode) {
-                    if (pickMode)
-                        shouldCloseVolume = false
+                if (explorerRouter.pickMode || explorerRouter.dropMode) {
                     finish()
                 } else {
                     unselectAll()
@@ -264,23 +261,32 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 invalidateOptionsMenu()
                 true
             }
+            R.id.lock -> {
+                volumeAdapter.selectedItems.forEach {
+                    volumeManager.getVolumeId(volumeAdapter.volumes[it])?.let { id ->
+                        volumeManager.closeVolume(id)
+                    }
+                }
+                unselectAll()
+                true
+            }
             R.id.remove -> {
                 val selectedVolumes = volumeAdapter.selectedItems.map { i -> volumeAdapter.volumes[i] }
                 removeVolumes(selectedVolumes)
                 true
             }
-            R.id.forget_password -> {
+            R.id.delete_password_hash -> {
                 for (i in volumeAdapter.selectedItems) {
                     if (volumeDatabase.removeHash(volumeAdapter.volumes[i]))
-                        volumeAdapter.onVolumeChanged(i)
+                        volumeAdapter.onVolumeDataChanged(i)
                 }
                 unselectAll(false)
                 true
             }
             R.id.change_password -> {
-                changePasswordPosition = volumeAdapter.selectedItems.elementAt(0)
+                selectedVolumePosition = volumeAdapter.selectedItems.elementAt(0)
                 changePassword.launch(Intent(this, ChangePasswordActivity::class.java).apply {
-                    putExtra("volume", volumeAdapter.volumes[changePasswordPosition!!])
+                    putExtra("volume", volumeAdapter.volumes[selectedVolumePosition!!])
                 })
                 true
             }
@@ -290,26 +296,33 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 true
             }
             R.id.copy -> {
-                val position = volumeAdapter.selectedItems.elementAt(0)
-                val volume = volumeAdapter.volumes[position]
-                when {
-                    volume.isHidden -> {
-                        PathUtils.safePickDirectory(pickDirectory, this, themeValue)
-                    }
-                    File(filesDir, volume.shortName).exists() -> {
-                        CustomAlertDialogBuilder(this, themeValue)
+                selectedVolumePosition = volumeAdapter.selectedItems.elementAt(0)
+                val volume = volumeAdapter.volumes[selectedVolumePosition!!]
+                if (volume.isHidden) {
+                    (application as VolumeManagerApp).isStartingExternalApp = true
+                    PathUtils.safePickDirectory(pickDirectory, this, theme)
+                } else {
+                    val hiddenVolumeFile = File(VolumeData.getHiddenVolumeFullPath(filesDir.path, volume.shortName))
+                    if (hiddenVolumeFile.exists()) {
+                        CustomAlertDialogBuilder(this, theme)
                             .setTitle(R.string.error)
                             .setMessage(R.string.hidden_volume_already_exists)
                             .setPositiveButton(R.string.ok, null)
                             .show()
-                    }
-                    else -> {
-                        unselect(position)
+                    } else {
+                        unselect(selectedVolumePosition!!)
                         copyVolume(
                             DocumentFile.fromFile(File(volume.name)),
-                            DocumentFile.fromFile(filesDir),
+                            DocumentFile.fromFile(hiddenVolumeFile.parentFile!!),
                         ) {
-                            SavedVolume(volume.shortName, true, volume.type, volume.encryptedHash, volume.iv)
+                            VolumeData(
+                                VolumeData.newUuid(),
+                                volume.shortName,
+                                true,
+                                volume.type,
+                                volume.encryptedHash,
+                                volume.iv
+                            )
                         }
                     }
                 }
@@ -331,25 +344,28 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.main_activity, menu)
-        menu.findItem(R.id.settings).isVisible = !pickMode && !dropMode
+        val settingsVisible = !explorerRouter.pickMode && !explorerRouter.dropMode
+        menu.findItem(R.id.settings).isVisible = settingsVisible
+        if (settingsVisible) {
+            UIUtils.getMenuIconNeutralTint(this, menu).applyTo(R.id.settings, R.drawable.icon_settings)
+        }
         val isSelecting = volumeAdapter.selectedItems.isNotEmpty()
         menu.findItem(R.id.select_all).isVisible = isSelecting
+        menu.findItem(R.id.lock).isVisible = isSelecting && volumeAdapter.selectedItems.any {
+            i -> volumeManager.isOpen(volumeAdapter.volumes[i])
+        }
         menu.findItem(R.id.remove).isVisible = isSelecting
-        menu.findItem(R.id.forget_password).isVisible =
+        menu.findItem(R.id.delete_password_hash).isVisible =
             isSelecting &&
             !volumeAdapter.selectedItems.any { i -> volumeAdapter.volumes[i].encryptedHash == null }
         val onlyOneSelected = volumeAdapter.selectedItems.size == 1
         val onlyOneAndWriteable =
             onlyOneSelected &&
             volumeAdapter.volumes[volumeAdapter.selectedItems.first()].canWrite(filesDir.path)
-        menu.findItem(R.id.change_password).isVisible =
-            onlyOneAndWriteable &&
-            // Only gocryptfs volumes support password change
-            !BuildConfig.GOCRYPTFS_DISABLED &&
-            volumeAdapter.volumes[volumeAdapter.selectedItems.first()].type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE
+        menu.findItem(R.id.change_password).isVisible = onlyOneAndWriteable
         menu.findItem(R.id.remove_default_open).isVisible =
             onlyOneSelected &&
-            volumeAdapter.volumes[volumeAdapter.selectedItems.first()].name == defaultVolumeName
+            volumeAdapter.volumes[volumeAdapter.selectedItems.first()].name == volumeOpener.defaultVolumeName
         with(menu.findItem(R.id.copy)) {
             isVisible = onlyOneSelected
             if (isVisible) {
@@ -360,18 +376,17 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 )
             }
         }
-        menu.findItem(R.id.rename).isVisible = onlyOneAndWriteable
-        supportActionBar?.setDisplayHomeAsUpEnabled(isSelecting || pickMode || dropMode)
+        menu.findItem(R.id.rename).isVisible = onlyOneAndWriteable && !volumeManager.isOpen(volumeAdapter.volumes[volumeAdapter.selectedItems.first()])
+        supportActionBar?.setDisplayHomeAsUpEnabled(isSelecting || explorerRouter.pickMode || explorerRouter.dropMode)
         return true
     }
 
     private fun onDirectoryPicked(uri: Uri) {
-        val position = volumeAdapter.selectedItems.elementAt(0)
-        val volume = volumeAdapter.volumes[position]
-        unselect(position)
+        val volume = volumeAdapter.volumes[selectedVolumePosition!!]
+        unselect(selectedVolumePosition!!)
         val dstDocumentFile = DocumentFile.fromTreeUri(this, uri)
         if (dstDocumentFile == null) {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.path_error)
                 .setPositiveButton(R.string.ok, null)
@@ -384,7 +399,8 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 dstRootDirectory.name?.let { name ->
                     val path = PathUtils.getFullPathFromTreeUri(dstRootDirectory.uri, this)
                     if (path == null) null
-                    else SavedVolume(
+                    else VolumeData(
+                        VolumeData.newUuid(),
                         PathUtils.pathJoin(path, name),
                         false,
                         volume.type,
@@ -396,34 +412,44 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    private fun copyVolume(srcDocumentFile: DocumentFile, dstDocumentFile: DocumentFile, getResultVolume: (DocumentFile) -> SavedVolume?) {
+    /**
+     * Copy a volume.
+     *
+     * @param srcDocumentFile [DocumentFile] of the volume to copy
+     * @param dstDocumentFile [DocumentFile] of the destination PARENT FOLDER
+     * @param getResultVolume A function that returns the [VolumeData] corresponding to the destination volume. Takes the [DocumentFile] of the newly created volume (not the parent folder).
+     */
+    private fun copyVolume(srcDocumentFile: DocumentFile, dstDocumentFile: DocumentFile, getResultVolume: (DocumentFile) -> VolumeData?) {
         lifecycleScope.launch {
             val result = fileOperationService.copyVolume(srcDocumentFile, dstDocumentFile)
-            when {
-                result.taskResult.cancelled -> {
-                    result.dstRootDirectory?.delete()
-                }
-                result.taskResult.failedItem == null -> {
+            when (result.taskResult.state) {
+                TaskResult.State.SUCCESS -> {
                     result.dstRootDirectory?.let {
                         getResultVolume(it)?.let { volume ->
                             volumeDatabase.saveVolume(volume)
-                            onVolumeAdded()
+                            volumeAdapter.apply {
+                                volumes = volumeDatabase.getVolumes()
+                                notifyItemInserted(volumes.size)
+                            }
+                            binding.textNoVolumes.visibility = View.GONE
                             Toast.makeText(this@MainActivity, R.string.copy_success, Toast.LENGTH_SHORT).show()
                         }
                     }
                 }
-                else -> {
-                    CustomAlertDialogBuilder(this@MainActivity, themeValue)
+                TaskResult.State.FAILED -> {
+                    CustomAlertDialogBuilder(this@MainActivity, theme)
                         .setTitle(R.string.error)
-                        .setMessage(getString(R.string.copy_failed, result.taskResult.failedItem.name))
+                        .setMessage(getString(R.string.copy_failed, result.taskResult.failedItem!!.name))
                         .setPositiveButton(R.string.ok, null)
                         .show()
                 }
+                TaskResult.State.ERROR -> result.taskResult.showErrorAlertDialog(this@MainActivity, theme)
+                TaskResult.State.CANCELLED -> {}
             }
         }
     }
 
-    private fun renameVolume(volume: SavedVolume, position: Int) {
+    private fun renameVolume(volume: VolumeData, position: Int) {
         with (EditTextDialog(this, R.string.new_volume_name) { newName ->
             val srcPath = File(volume.getFullPath(filesDir.path))
             val dstPath = File(srcPath.parent, newName).canonicalFile
@@ -441,14 +467,16 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 DocumentFile.fromFile(srcPath).renameTo(newName)
             }
             if (success) {
-                volumeDatabase.renameVolume(volume.name, newDBName)
+                volumeDatabase.renameVolume(volume, newDBName)
+                VolumeProvider.notifyRootsChanged(this)
+                volumeAdapter.onVolumeDataChanged(position)
                 unselect(position)
-                if (volume.name == defaultVolumeName) {
+                if (volume.name == volumeOpener.defaultVolumeName) {
                     with (sharedPrefs.edit()) {
                         putString(DEFAULT_VOLUME_KEY, newDBName)
                         apply()
                     }
-                    defaultVolumeName = newDBName
+                    volumeOpener.defaultVolumeName = newDBName
                 }
             } else {
                 Toast.makeText(this, R.string.volume_rename_failed, Toast.LENGTH_SHORT).show()
@@ -459,203 +487,23 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         }
     }
 
-    @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
-    private fun openVolume(volume: SavedVolume, position: Int) {
-        if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE && BuildConfig.GOCRYPTFS_DISABLED) {
-            Toast.makeText(this, R.string.gocryptfs_disabled, Toast.LENGTH_SHORT).show()
-            return
-        } else if (volume.type == EncryptedVolume.CRYFS_VOLUME_TYPE && BuildConfig.CRYFS_DISABLED) {
-            Toast.makeText(this, R.string.cryfs_disabled, Toast.LENGTH_SHORT).show()
-            return
-        }
-        var askForPassword = true
-        fingerprintProtector?.let { fingerprintProtector ->
-            volume.encryptedHash?.let { encryptedHash ->
-                volume.iv?.let { iv ->
-                    askForPassword = false
-                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
-                        override fun onHashStorageReset() {
-                            volumeAdapter.refresh()
-                        }
-                        override fun onPasswordHashDecrypted(hash: ByteArray) {
-                            object : LoadingTask<EncryptedVolume?>(this@MainActivity, themeValue, R.string.loading_msg_open) {
-                                override suspend fun doTask(): EncryptedVolume? {
-                                    val encryptedVolume = EncryptedVolume.init(volume, filesDir.path, null, hash, null)
-                                    Arrays.fill(hash, 0)
-                                    return encryptedVolume
-                                }
-                            }.startTask(lifecycleScope) { encryptedVolume ->
-                                if (encryptedVolume == null) {
-                                    CustomAlertDialogBuilder(this@MainActivity, themeValue)
-                                        .setTitle(R.string.open_volume_failed)
-                                        .setMessage(R.string.open_failed_hash_msg)
-                                        .setPositiveButton(R.string.ok, null)
-                                        .show()
-                                } else {
-                                    startExplorer(encryptedVolume, volume.shortName)
-                                }
-                            }
-                        }
-                        override fun onPasswordHashSaved() {}
-                        override fun onFailed(pending: Boolean) {
-                            if (!pending) {
-                                askForPassword(volume, position)
-                            }
-                        }
-                    }
-                    fingerprintProtector.loadPasswordHash(volume.shortName, encryptedHash, iv)
+    private fun openVolume(volume: VolumeData) {
+        volumeOpener.openVolume(volume, true, object : VolumeOpener.VolumeOpenerCallbacks {
+            override fun onHashStorageReset() {
+                volumeAdapter.refresh()
+            }
+
+            override fun onVolumeOpened(id: Int) {
+                startActivity(explorerRouter.getExplorerIntent(id, volume.shortName))
+                if (explorerRouter.dropMode || explorerRouter.pickMode) {
+                    finish()
                 }
             }
-        }
-        if (askForPassword)
-            askForPassword(volume, position)
-    }
-
-    private fun onPasswordSubmitted(volume: SavedVolume, position: Int, dialogBinding: DialogOpenVolumeBinding) {
-        if (dialogBinding.checkboxDefaultOpen.isChecked xor (defaultVolumeName == volume.name)) {
-            with (sharedPrefs.edit()) {
-                defaultVolumeName = if (dialogBinding.checkboxDefaultOpen.isChecked) {
-                    putString(DEFAULT_VOLUME_KEY, volume.name)
-                    volume.name
-                } else {
-                    remove(DEFAULT_VOLUME_KEY)
-                    null
-                }
-                apply()
-            }
-        }
-        // openVolumeWithPassword is responsible for wiping the password
-        openVolumeWithPassword(
-            volume,
-            position,
-            WidgetUtil.encodeEditTextContent(dialogBinding.editPassword),
-            dialogBinding.checkboxSavePassword.isChecked,
-        )
-    }
-
-    private fun askForPassword(volume: SavedVolume, position: Int, savePasswordHash: Boolean = false) {
-        val dialogBinding = DialogOpenVolumeBinding.inflate(layoutInflater)
-        if (!usfFingerprint || fingerprintProtector == null || volume.encryptedHash != null || volume.type == EncryptedVolume.CRYFS_VOLUME_TYPE) {
-            dialogBinding.checkboxSavePassword.visibility = View.GONE
-        } else {
-            dialogBinding.checkboxSavePassword.isChecked = savePasswordHash
-        }
-        dialogBinding.checkboxDefaultOpen.isChecked = defaultVolumeName == volume.name
-        val dialog = CustomAlertDialogBuilder(this, themeValue)
-            .setTitle(getString(R.string.open_dialog_title, volume.shortName))
-            .setView(dialogBinding.root)
-            .setNegativeButton(R.string.cancel, null)
-            .setPositiveButton(R.string.open) { _, _ ->
-                onPasswordSubmitted(volume, position, dialogBinding)
-            }
-            .create()
-        dialogBinding.editPassword.apply {
-            setOnEditorActionListener { _, _, _ ->
-                dialog.dismiss()
-                onPasswordSubmitted(volume, position, dialogBinding)
-                true
-            }
-            if (sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false)) {
-                inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
-            }
-        }
-        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
-        dialog.show()
-    }
-
-    private fun openVolumeWithPassword(volume: SavedVolume, position: Int, password: ByteArray, savePasswordHash: Boolean) {
-        val usfFingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
-        var returnedHash: ByteArray? = null
-        if (savePasswordHash && usfFingerprint) {
-            returnedHash = ByteArray(GocryptfsVolume.KeyLen)
-        }
-        object : LoadingTask<EncryptedVolume?>(this, themeValue, R.string.loading_msg_open) {
-            override suspend fun doTask(): EncryptedVolume? {
-                val encryptedVolume = EncryptedVolume.init(volume, filesDir.path, password, null, returnedHash)
-                Arrays.fill(password, 0)
-                return encryptedVolume
-            }
-        }.startTask(lifecycleScope) { encryptedVolume ->
-            if (encryptedVolume == null) {
-                CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.open_volume_failed)
-                    .setMessage(R.string.open_volume_failed_msg)
-                    .setPositiveButton(R.string.ok) { _, _ ->
-                        askForPassword(volume, position, savePasswordHash)
-                    }
-                    .show()
-            } else {
-                val fingerprintProtector = fingerprintProtector
-                @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
-                if (savePasswordHash && returnedHash != null && fingerprintProtector != null) {
-                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
-                        override fun onHashStorageReset() {
-                            volumeAdapter.refresh()
-                        }
-                        override fun onPasswordHashDecrypted(hash: ByteArray) {}
-                        override fun onPasswordHashSaved() {
-                            Arrays.fill(returnedHash, 0)
-                            volumeAdapter.onVolumeChanged(position)
-                            startExplorer(encryptedVolume, volume.shortName)
-                        }
-                        private var isClosed = false
-                        override fun onFailed(pending: Boolean) {
-                            if (!isClosed) {
-                                encryptedVolume.close()
-                                isClosed = true
-                            }
-                            Arrays.fill(returnedHash, 0)
-                        }
-                    }
-                    fingerprintProtector.savePasswordHash(volume, returnedHash)
-                } else {
-                    startExplorer(encryptedVolume, volume.shortName)
-                }
-            }
-        }
-    }
-
-    private fun startExplorer(encryptedVolume: EncryptedVolume, volumeShortName: String) {
-        var explorerIntent: Intent? = null
-        if (dropMode) { //import via android share menu
-            explorerIntent = Intent(this, ExplorerActivityDrop::class.java)
-            explorerIntent.action = intent.action //forward action
-            explorerIntent.putExtras(intent.extras!!) //forward extras
-        } else if (pickMode) {
-            explorerIntent = Intent(this, ExplorerActivityPick::class.java)
-            explorerIntent.putExtra("destinationVolume", intent.getParcelableExtra<EncryptedVolume>("volume")!!)
-            explorerIntent.flags = Intent.FLAG_ACTIVITY_FORWARD_RESULT
-        }
-        if (explorerIntent == null) {
-            explorerIntent = Intent(this, ExplorerActivity::class.java) //default opening
-        }
-        explorerIntent.putExtra("volume", encryptedVolume)
-        explorerIntent.putExtra("volume_name", volumeShortName)
-        startActivity(explorerIntent)
-        if (pickMode)
-            shouldCloseVolume = false
-        if (dropMode || pickMode)
-            finish()
-    }
-
-    override fun onBackPressed() {
-        if (volumeAdapter.selectedItems.isNotEmpty()) {
-            unselectAll()
-        } else {
-            if (pickMode)
-                shouldCloseVolume = false
-            super.onBackPressed()
-        }
+        })
     }
 
     override fun onStop() {
         super.onStop()
-        if (pickMode && !usfKeepOpen) {
-            finish()
-            if (shouldCloseVolume) {
-                intent.getParcelableExtra<EncryptedVolume>("volume")?.close()
-                RestrictedFileProvider.wipeAll(this)
-            }
-        }
+        volumeOpener.wipeSensitive()
     }
 }

app/src/main/java/sushi/hardcore/droidfs/MemFile.kt

@@ -0,0 +1,22 @@
+package sushi.hardcore.droidfs
+
+import android.os.ParcelFileDescriptor
+import android.system.Os
+
+class MemFile private constructor(private val fd: Int) {
+    companion object {
+        private external fun createMemFile(name: String, size: Long): Int
+        init {
+            System.loadLibrary("memfile")
+        }
+
+        fun create(name: String, size: Long): MemFile? {
+            val fd = createMemFile(name, size)
+            return if (fd > 0) MemFile(fd) else null
+        }
+    }
+
+    fun dup(): ParcelFileDescriptor = ParcelFileDescriptor.fromFd(fd)
+    fun toParcelFileDescriptor(): ParcelFileDescriptor = ParcelFileDescriptor.adoptFd(fd)
+    fun close() = Os.close(ParcelFileDescriptor.adoptFd(fd).fileDescriptor)
+}

app/src/main/java/sushi/hardcore/droidfs/NotificationBroadcastReceiver.kt

@@ -0,0 +1,23 @@
+package sushi.hardcore.droidfs
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import sushi.hardcore.droidfs.file_operations.FileOperationService
+
+class NotificationBroadcastReceiver: BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        when (intent.action) {
+            FileOperationService.ACTION_CANCEL -> {
+                intent.getBundleExtra("bundle")?.let { bundle ->
+                    // TODO: use peekService instead?
+                    val binder = (bundle.getBinder("binder") as FileOperationService.LocalBinder?)
+                    binder?.getService()?.cancelOperation(bundle.getInt("taskId"))
+                }
+            }
+            VolumeManagerApp.ACTION_CLOSE_ALL_VOLUMES -> {
+                (context.applicationContext as VolumeManagerApp).volumeManager.closeAll()
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/SavedVolume.kt

@@ -1,60 +0,0 @@
-package sushi.hardcore.droidfs
-
-import android.os.Parcel
-import android.os.Parcelable
-import sushi.hardcore.droidfs.util.PathUtils
-import java.io.File
-
-class SavedVolume(val name: String, val isHidden: Boolean = false, val type: Byte, var encryptedHash: ByteArray? = null, var iv: ByteArray? = null): Parcelable {
-
-    constructor(parcel: Parcel) : this(
-        parcel.readString()!!,
-        parcel.readByte() != 0.toByte(),
-        parcel.readByte(),
-        parcel.createByteArray(),
-        parcel.createByteArray()
-    )
-
-    val shortName: String by lazy {
-        File(name).name
-    }
-
-    fun getFullPath(filesDir: String): String {
-        return if (isHidden)
-            getHiddenVolumeFullPath(filesDir, name)
-        else
-            name
-    }
-
-    fun canWrite(filesDir: String): Boolean {
-        return File(getFullPath(filesDir)).canWrite()
-    }
-
-    override fun describeContents(): Int {
-        return 0
-    }
-
-    override fun writeToParcel(dest: Parcel, flags: Int) {
-        with (dest) {
-            writeString(name)
-            writeByte(if (isHidden) 1 else 0)
-            writeByte(type)
-            writeByteArray(encryptedHash)
-            writeByteArray(iv)
-        }
-    }
-
-    companion object {
-        const val VOLUMES_DIRECTORY = "volumes"
-
-        @JvmField
-        val CREATOR = object : Parcelable.Creator<SavedVolume> {
-            override fun createFromParcel(parcel: Parcel) = SavedVolume(parcel)
-            override fun newArray(size: Int) = arrayOfNulls<SavedVolume>(size)
-        }
-
-        fun getHiddenVolumeFullPath(filesDir: String, name: String): String {
-            return PathUtils.pathJoin(filesDir, VOLUMES_DIRECTORY, name)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/SettingsActivity.kt

@@ -1,18 +1,30 @@
 package sushi.hardcore.droidfs
 
+import android.app.ActivityOptions
+import android.content.Intent
 import android.content.SharedPreferences
 import android.os.Build
 import android.os.Bundle
 import android.text.InputType
 import android.view.MenuItem
 import android.widget.Toast
-import androidx.preference.*
+import androidx.core.content.ContextCompat
+import androidx.preference.ListPreference
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+import androidx.preference.PreferenceManager
+import androidx.preference.SwitchPreference
+import androidx.preference.SwitchPreferenceCompat
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
 import sushi.hardcore.droidfs.databinding.ActivitySettingsBinding
+import sushi.hardcore.droidfs.util.AndroidUtils
+import sushi.hardcore.droidfs.util.Compat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 
 class SettingsActivity : BaseActivity() {
+    private val notificationPermissionHelper = AndroidUtils.NotificationPermissionHelper(this)
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -34,7 +46,7 @@ class SettingsActivity : BaseActivity() {
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId){
             android.R.id.home -> {
-                onBackPressed() //return to the previous fragment rather than the activity
+                onBackPressedDispatcher.onBackPressed() //return to the previous fragment rather than the activity
                 true
             }
             else -> super.onOptionsItemSelected(item)
@@ -60,7 +72,7 @@ class SettingsActivity : BaseActivity() {
                 showMaxSizeDialog()
             } else {
                 with(sharedPrefs.edit()) {
-                    putLong(ConstValues.THUMBNAIL_MAX_SIZE_KEY, value)
+                    putLong(Constants.THUMBNAIL_MAX_SIZE_KEY, value)
                     apply()
                 }
                 maxSizePreference.summary = PathUtils.formatSize(size)
@@ -79,19 +91,37 @@ class SettingsActivity : BaseActivity() {
             }
         }
 
+        private fun refreshTheme() {
+            with(requireActivity()) {
+                startActivity(
+                    Intent(this, SettingsActivity::class.java),
+                    ActivityOptions.makeCustomAnimation(
+                        this,
+                        android.R.anim.fade_in,
+                        android.R.anim.fade_out
+                    ).toBundle()
+                )
+                finish()
+            }
+        }
+
         override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
             setPreferencesFromResource(R.xml.root_preferences, rootKey)
             sharedPrefs = PreferenceManager.getDefaultSharedPreferences(requireContext())
-            findPreference<ListPreference>("theme")?.setOnPreferenceChangeListener { _, newValue ->
-                (activity as BaseActivity).onThemeChanged(newValue as String)
+            findPreference<ListPreference>("color")?.setOnPreferenceChangeListener { _, _ ->
+                refreshTheme()
                 true
             }
-            findPreference<Preference>(ConstValues.THUMBNAIL_MAX_SIZE_KEY)?.let {
+            findPreference<SwitchPreferenceCompat>("black_theme")?.setOnPreferenceChangeListener { _, _ ->
+                refreshTheme()
+                true
+            }
+            findPreference<Preference>(Constants.THUMBNAIL_MAX_SIZE_KEY)?.let {
                 maxSizePreference = it
                 maxSizePreference.summary = getString(
                     R.string.thumbnail_max_size_summary,
                     PathUtils.formatSize(sharedPrefs.getLong(
-                        ConstValues.THUMBNAIL_MAX_SIZE_KEY, ConstValues.DEFAULT_THUMBNAIL_MAX_SIZE
+                        Constants.THUMBNAIL_MAX_SIZE_KEY, Constants.DEFAULT_THUMBNAIL_MAX_SIZE
                     )*1000)
                 )
                 maxSizePreference.setOnPreferenceClickListener {
@@ -99,6 +129,10 @@ class SettingsActivity : BaseActivity() {
                     false
                 }
             }
+            findPreference<Preference>("logcat")?.setOnPreferenceClickListener { _ ->
+                startActivity(Intent(requireContext(), LogcatActivity::class.java))
+                true
+            }
         }
     }
 
@@ -126,7 +160,7 @@ class SettingsActivity : BaseActivity() {
                     if (errorMsg == null) {
                         true
                     } else {
-                        CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).themeValue)
+                        CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).theme)
                             .setTitle(R.string.error)
                             .setMessage(errorMsg)
                             .setPositiveButton(R.string.ok, null)
@@ -137,6 +171,68 @@ class SettingsActivity : BaseActivity() {
                     true
                 }
             }
+            val switchBackground = findPreference<SwitchPreference>("usf_background")!!
+            val switchKeepOpen = findPreference<SwitchPreference>("usf_keep_open")!!
+            val switchExternalOpen = findPreference<SwitchPreference>("usf_open")!!
+            val switchExpose = findPreference<SwitchPreference>("usf_expose")!!
+            val switchSafWrite = findPreference<SwitchPreference>("usf_saf_write")!!
+
+            fun onUsfBackgroundChanged(usfBackground: Boolean) {
+                fun updateSwitchPreference(switch: SwitchPreference) = with (switch) {
+                    isChecked = isChecked && usfBackground
+                    isEnabled = usfBackground
+                    onPreferenceChangeListener?.onPreferenceChange(switch, isChecked)
+                }
+                updateSwitchPreference(switchKeepOpen)
+                updateSwitchPreference(switchExpose)
+            }
+            onUsfBackgroundChanged(switchBackground.isChecked)
+
+            fun updateSafWrite(usfOpen: Boolean? = null, usfExpose: Boolean? = null) {
+                switchSafWrite.isEnabled = usfOpen ?: switchExternalOpen.isChecked || usfExpose ?: switchExpose.isChecked
+            }
+            updateSafWrite()
+
+            switchBackground.setOnPreferenceChangeListener { _, checked ->
+                onUsfBackgroundChanged(checked as Boolean)
+                true
+            }
+            switchExternalOpen.setOnPreferenceChangeListener { _, checked ->
+                updateSafWrite(usfOpen = checked as Boolean)
+                true
+            }
+            switchExpose.setOnPreferenceChangeListener { _, checked ->
+                updateSafWrite(usfExpose = checked as Boolean)
+                VolumeProvider.notifyRootsChanged(requireContext())
+                true
+            }
+
+            switchKeepOpen.setOnPreferenceChangeListener { _, checked ->
+                if (checked as Boolean) {
+                    (requireActivity() as SettingsActivity).notificationPermissionHelper.askAndRun {
+                        requireContext().let {
+                            if (AndroidUtils.isServiceRunning(it, KeepAliveService::class.java)) {
+                                ContextCompat.startForegroundService(it, Intent(it, KeepAliveService::class.java).apply {
+                                    action = KeepAliveService.ACTION_FOREGROUND
+                                })
+                            }
+                        }
+                    }
+                }
+                true
+            }
+            findPreference<ListPreference>("export_method")!!.setOnPreferenceChangeListener { _, newValue ->
+                if (newValue as String == "memory" && !Compat.isMemFileSupported()) {
+                    CustomAlertDialogBuilder(requireContext(), (requireActivity() as BaseActivity).theme)
+                        .setTitle(R.string.error)
+                        .setMessage(getString(R.string.memfd_create_unsupported, Compat.MEMFD_CREATE_MINIMUM_KERNEL_VERSION))
+                        .setPositiveButton(R.string.ok, null)
+                        .show()
+                    return@setOnPreferenceChangeListener false
+                }
+                EncryptedFileProvider.exportMethod = EncryptedFileProvider.ExportMethod.parse(newValue)
+                true
+            }
         }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/Theme.kt

@@ -0,0 +1,68 @@
+package sushi.hardcore.droidfs
+
+import android.content.SharedPreferences
+import android.os.Parcel
+import android.os.Parcelable
+
+class Theme(var color: String, var black: Boolean) : Parcelable {
+
+    constructor(parcel: Parcel) : this(
+        parcel.readString()!!,
+        parcel.readByte() != 0.toByte(),
+    )
+
+    fun toResourceId(): Int {
+        return if (black) {
+            when (color) {
+                "red" -> R.style.BlackRed
+                "blue" -> R.style.BlackBlue
+                "yellow" -> R.style.BlackYellow
+                "orange" -> R.style.BlackOrange
+                "purple" -> R.style.BlackPurple
+                "pink" -> R.style.BlackPink
+                else -> R.style.BlackGreen
+            }
+        } else {
+            when (color) {
+                "red" -> R.style.DarkRed
+                "blue" -> R.style.DarkBlue
+                "yellow" -> R.style.DarkYellow
+                "orange" -> R.style.DarkOrange
+                "purple" -> R.style.DarkPurple
+                "pink" -> R.style.DarkPink
+                else -> R.style.BaseTheme
+            }
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is Theme) {
+            return false
+        }
+        return other.color == color && other.black == black
+    }
+
+    override fun describeContents(): Int = 0
+
+    override fun writeToParcel(dest: Parcel, flags: Int) {
+        with(dest) {
+            writeString(color)
+            writeByte(if (black) 1 else 0)
+        }
+    }
+
+
+    companion object {
+        @JvmField
+        val CREATOR = object : Parcelable.Creator<Theme> {
+            override fun createFromParcel(parcel: Parcel) = Theme(parcel)
+            override fun newArray(size: Int) = arrayOfNulls<Theme>(size)
+        }
+
+        fun fromSharedPrefs(sharedPrefs: SharedPreferences): Theme {
+            val color = sharedPrefs.getString("color", "green")!!
+            val black = sharedPrefs.getBoolean("black_theme", false)
+            return Theme(color, black)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/ThumbnailsLoader.kt

@@ -0,0 +1,92 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.widget.ImageView
+import androidx.lifecycle.LifecycleCoroutineScope
+import com.bumptech.glide.Glide
+import com.bumptech.glide.request.target.DrawableImageViewTarget
+import com.bumptech.glide.request.transition.Transition
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+
+class ThumbnailsLoader(
+    private val context: Context,
+    private val encryptedVolume: EncryptedVolume,
+    private val maxSize: Long,
+    private val lifecycleScope: LifecycleCoroutineScope
+) {
+    internal class ThumbnailData(val id: Int, val path: String, val imageView: ImageView, val onLoaded: (Drawable) -> Unit)
+    internal class ThumbnailTask(var senderJob: Job?, var workerJob: Job?, var target: DrawableImageViewTarget?)
+
+    private val concurrentTasks = Runtime.getRuntime().availableProcessors()/4
+    private val channel = Channel<ThumbnailData>(concurrentTasks)
+    private var taskId = 0
+    private val tasks = HashMap<Int, ThumbnailTask>()
+
+    private suspend fun loadThumbnail(data: ThumbnailData) {
+        withContext(Dispatchers.IO) {
+            encryptedVolume.loadWholeFile(data.path, maxSize = maxSize).first?.let {
+                yield()
+                withContext(Dispatchers.Main) {
+                    tasks[data.id]?.let { task ->
+                        val channel = Channel<Unit>(1)
+                        task.target = Glide.with(context).load(it).skipMemoryCache(true).into(object : DrawableImageViewTarget(data.imageView) {
+                            override fun onResourceReady(
+                                resource: Drawable,
+                                transition: Transition<in Drawable>?
+                            ) {
+                                super.onResourceReady(resource, transition)
+                                data.onLoaded(resource)
+                                channel.trySend(Unit)
+                            }
+                        })
+                        channel.receive()
+                        tasks.remove(data.id)
+                    }
+                }
+            }
+        }
+    }
+
+    fun initialize() {
+        for (i in 0 until concurrentTasks) {
+            lifecycleScope.launch {
+                while (true) {
+                    val data = channel.receive()
+                    val workerJob = launch {
+                        loadThumbnail(data)
+                    }
+                    tasks[data.id]?.workerJob = workerJob
+                    workerJob.join()
+                }
+            }
+        }
+    }
+
+    fun loadAsync(path: String, target: ImageView, onLoaded: (Drawable) -> Unit): Int {
+        val id = taskId++
+        tasks[id] = ThumbnailTask(null, null, null)
+        val senderJob = lifecycleScope.launch {
+            channel.send(ThumbnailData(id, path, target, onLoaded))
+        }
+        tasks[id]!!.senderJob = senderJob
+        return id
+    }
+
+    fun cancel(id: Int) {
+        tasks[id]?.let { task ->
+            task.senderJob?.cancel()
+            task.workerJob?.cancel()
+            task.target?.let {
+                Glide.with(context).clear(it)
+            }
+        }
+        tasks.remove(id)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeData.kt

@@ -0,0 +1,111 @@
+package sushi.hardcore.droidfs
+
+import android.os.Parcel
+import android.os.Parcelable
+import sushi.hardcore.droidfs.filesystems.CryfsVolume
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
+import java.io.FileInputStream
+import java.util.UUID
+
+class VolumeData(
+    val uuid: String,
+    val name: String,
+    val isHidden: Boolean = false,
+    val type: Byte,
+    var encryptedHash: ByteArray? = null,
+    var iv: ByteArray? = null
+) : Parcelable {
+
+    constructor(parcel: Parcel) : this(
+        parcel.readString()!!,
+        parcel.readString()!!,
+        parcel.readByte() != 0.toByte(),
+        parcel.readByte(),
+        parcel.createByteArray(),
+        parcel.createByteArray()
+    )
+
+    val shortName: String by lazy {
+        File(name).name
+    }
+
+    fun getFullPath(filesDir: String) = getFullPath(name, isHidden, filesDir)
+
+    fun canRead(filesDir: String): Boolean {
+        val volumePath = getFullPath(filesDir)
+        if (!File(volumePath).canRead()) {
+            return false
+        }
+        val configFile = when (type) {
+            EncryptedVolume.GOCRYPTFS_VOLUME_TYPE -> PathUtils.pathJoin(volumePath, GocryptfsVolume.CONFIG_FILE_NAME)
+            EncryptedVolume.CRYFS_VOLUME_TYPE -> PathUtils.pathJoin(volumePath, CryfsVolume.CONFIG_FILE_NAME)
+            else -> return false
+        }
+        var success = true
+        try {
+            with (FileInputStream(configFile)) {
+                read()
+                close()
+            }
+        } catch (e: Exception) {
+            success = false
+        }
+        return success
+    }
+
+    fun canWrite(filesDir: String): Boolean {
+        return File(getFullPath(filesDir)).canWrite()
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    override fun writeToParcel(dest: Parcel, flags: Int) {
+        with (dest) {
+            writeString(uuid)
+            writeString(name)
+            writeByte(if (isHidden) 1 else 0)
+            writeByte(type)
+            writeByteArray(encryptedHash)
+            writeByteArray(iv)
+        }
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is VolumeData) {
+            return false
+        }
+        return other.uuid == uuid || (other.name == name && other.isHidden == isHidden)
+    }
+
+    override fun hashCode(): Int {
+        return name.hashCode()+isHidden.hashCode()
+    }
+
+    companion object {
+        const val VOLUMES_DIRECTORY = "volumes"
+
+        @JvmField
+        val CREATOR = object : Parcelable.Creator<VolumeData> {
+            override fun createFromParcel(parcel: Parcel) = VolumeData(parcel)
+            override fun newArray(size: Int) = arrayOfNulls<VolumeData>(size)
+        }
+
+        fun newUuid(): String = UUID.randomUUID().toString()
+
+        fun getHiddenVolumeFullPath(filesDir: String, name: String): String {
+            return PathUtils.pathJoin(filesDir, VOLUMES_DIRECTORY, name)
+        }
+
+        fun getFullPath(name: String, isHidden: Boolean, filesDir: String): String {
+            return if (isHidden)
+                getHiddenVolumeFullPath(filesDir, name)
+            else
+                name
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeDatabase.kt

@@ -2,6 +2,7 @@ package sushi.hardcore.droidfs
 
 import android.content.ContentValues
 import android.content.Context
+import android.database.Cursor
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
 import android.util.Log
@@ -9,117 +10,212 @@ import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.util.PathUtils
 import java.io.File
 
-class VolumeDatabase(private val context: Context): SQLiteOpenHelper(context, ConstValues.VOLUME_DATABASE_NAME, null, 4) {
+class VolumeDatabase(private val context: Context): SQLiteOpenHelper(context, Constants.VOLUME_DATABASE_NAME, null, 6) {
     companion object {
-        const val TABLE_NAME = "Volumes"
-        const val COLUMN_NAME = "name"
-        const val COLUMN_HIDDEN = "hidden"
-        const val COLUMN_TYPE = "type"
-        const val COLUMN_HASH = "hash"
-        const val COLUMN_IV = "iv"
-
-        private fun contentValuesFromVolume(volume: SavedVolume): ContentValues {
-            val contentValues = ContentValues()
-            contentValues.put(COLUMN_NAME, volume.name)
-            contentValues.put(COLUMN_HIDDEN, volume.isHidden)
-            contentValues.put(COLUMN_TYPE, byteArrayOf(volume.type))
-            contentValues.put(COLUMN_HASH, volume.encryptedHash)
-            contentValues.put(COLUMN_IV, volume.iv)
-            return contentValues
-        }
+        private const val TAG = "VolumeDatabase"
+        private const val TABLE_NAME = "Volumes"
+        private const val COLUMN_UUID = "uuid"
+        private const val COLUMN_NAME = "name"
+        private const val COLUMN_HIDDEN = "hidden"
+        private const val COLUMN_TYPE = "type"
+        private const val COLUMN_HASH = "hash"
+        private const val COLUMN_IV = "iv"
     }
-    override fun onCreate(db: SQLiteDatabase) {
+
+    private fun createTable(db: SQLiteDatabase) =
         db.execSQL(
-            "CREATE TABLE IF NOT EXISTS $TABLE_NAME (" +
-                    "$COLUMN_NAME TEXT PRIMARY KEY," +
-                    "$COLUMN_HIDDEN SHORT," +
-                    "$COLUMN_TYPE BLOB," +
-                    "$COLUMN_HASH BLOB," +
-                    "$COLUMN_IV BLOB" +
-                ");"
+        "CREATE TABLE IF NOT EXISTS $TABLE_NAME (" +
+                "$COLUMN_UUID TEXT PRIMARY KEY," +
+                "$COLUMN_NAME TEXT," +
+                "$COLUMN_HIDDEN SHORT," +
+                "$COLUMN_TYPE BLOB," +
+                "$COLUMN_HASH BLOB," +
+                "$COLUMN_IV BLOB" +
+            ");"
         )
-        File(context.filesDir, SavedVolume.VOLUMES_DIRECTORY).mkdir()
+
+    override fun onCreate(db: SQLiteDatabase) {
+        createTable(db)
+        File(context.filesDir, VolumeData.VOLUMES_DIRECTORY).mkdir()
+    }
+
+    override fun onOpen(db: SQLiteDatabase) {
+        //check if database has been corrupted by v2.1.1
+        val cursor = db.rawQuery("SELECT * FROM $TABLE_NAME WHERE $COLUMN_TYPE IS NULL;", null)
+        if (cursor.count > 0) {
+            Log.w(TAG, "Found ${cursor.count} corrupted volumes")
+            while (cursor.moveToNext()) {
+                // fix columns left shift
+                val uuid = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_UUID)+5)
+                val name = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME)-1)
+                val isHidden = cursor.getShort(cursor.getColumnIndexOrThrow(COLUMN_HIDDEN)-1) == 1.toShort()
+                val type = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_TYPE)-1)[0]
+                val hash = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)-1)
+                val iv = cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_IV)-1)
+                if (db.delete(TABLE_NAME, "$COLUMN_IV=?", arrayOf(uuid)) < 1) {
+                    Log.e(TAG, "Failed to remove volume $name")
+                }
+                if (db.insert(TABLE_NAME, null, ContentValues().apply {
+                        put(COLUMN_UUID, uuid)
+                        put(COLUMN_NAME, name)
+                        put(COLUMN_HIDDEN, isHidden)
+                        put(COLUMN_TYPE, byteArrayOf(type))
+                        put(COLUMN_HASH, hash)
+                        put(COLUMN_IV, iv)
+                    }) < 0) {
+                    Log.e(TAG, "Failed to insert volume $name")
+                }
+            }
+        }
+        cursor.close()
+    }
+
+    private fun getNewVolumePath(volumeName: String): File {
+        return File(
+            VolumeData.getFullPath(volumeName, true, context.filesDir.path)
+        ).canonicalFile
     }
 
     override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
-        // Adding type column and set it to GOCRYPTFS_VOLUME_TYPE for all existing volumes
-        db.execSQL("ALTER TABLE $TABLE_NAME ADD COLUMN $COLUMN_TYPE BLOB;")
-        db.update(TABLE_NAME, ContentValues().apply {
-            put(COLUMN_TYPE, byteArrayOf(EncryptedVolume.GOCRYPTFS_VOLUME_TYPE))
-        }, null, null)
+        if (oldVersion == 3) {
+            // Adding type column and set it to GOCRYPTFS_VOLUME_TYPE for all existing volumes
+            db.execSQL("ALTER TABLE $TABLE_NAME ADD COLUMN $COLUMN_TYPE BLOB;")
+            db.update(TABLE_NAME, ContentValues().apply {
+                put(COLUMN_TYPE, byteArrayOf(EncryptedVolume.GOCRYPTFS_VOLUME_TYPE))
+            }, null, null)
 
-        // Moving hidden volumes to the "volumes" directory
-        if (File(context.filesDir, SavedVolume.VOLUMES_DIRECTORY).mkdir()) {
-            val cursor = db.query(
-                TABLE_NAME,
-                arrayOf(COLUMN_NAME),
-                "$COLUMN_HIDDEN=?",
-                arrayOf("1"),
-                null,
-                null,
-                null
-            )
-            while (cursor.moveToNext()) {
-                val volumeName = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME))
-                File(
-                    PathUtils.pathJoin(
-                        context.filesDir.path,
-                        volumeName
-                    )
-                ).renameTo(
-                    File(
-                        SavedVolume(
-                            volumeName,
-                            true,
-                            EncryptedVolume.GOCRYPTFS_VOLUME_TYPE
-                        ).getFullPath(context.filesDir.path)
-                    ).canonicalFile
+            // Moving registered hidden volumes to the "volumes" directory
+            if (File(context.filesDir, VolumeData.VOLUMES_DIRECTORY).mkdir()) {
+                val cursor = db.query(
+                    TABLE_NAME,
+                    arrayOf(COLUMN_NAME),
+                    "$COLUMN_HIDDEN=?",
+                    arrayOf("1"),
+                    null,
+                    null,
+                    null
                 )
+                while (cursor.moveToNext()) {
+                    val volumeName = cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME))
+                    val success = File(
+                        PathUtils.pathJoin(
+                            context.filesDir.path,
+                            volumeName
+                        )
+                    ).renameTo(getNewVolumePath(volumeName))
+                    if (!success) {
+                        Log.e(TAG, "Failed to move $volumeName")
+                    }
+                }
+                cursor.close()
+            } else {
+                Log.e(TAG, "Volumes directory creation failed while upgrading")
+            }
+        }
+        // Moving unregistered hidden volumes to the "volumes" directory
+        File(context.filesDir.path).listFiles()?.let {
+            for (i in it) {
+                if (i.isDirectory && i.name != Constants.CRYFS_LOCAL_STATE_DIR && i.name != VolumeData.VOLUMES_DIRECTORY) {
+                    if (EncryptedVolume.getVolumeType(i.path) != (-1).toByte()) {
+                        if (!i.renameTo(getNewVolumePath(i.name))) {
+                            Log.e(TAG, "Failed to move "+i.name)
+                        }
+                    }
+                }
+            }
+        }
+        if (oldVersion < 6) {
+            val cursor = db.rawQuery("SELECT $COLUMN_NAME FROM $TABLE_NAME;", null)
+            val volumeNames = arrayOfNulls<String>(cursor.count)
+            var i = 0
+            while (cursor.moveToNext()) {
+                volumeNames[i++] = cursor.getString(0)
             }
             cursor.close()
-        } else {
-            Log.e("VolumeDatabase", "Volumes directory creation failed while upgrading")
+            if (volumeNames.isEmpty()) {
+                db.execSQL("DROP TABLE $TABLE_NAME;")
+                createTable(db)
+            } else {
+                db.execSQL("ALTER TABLE $TABLE_NAME RENAME TO OLD;")
+                createTable(db)
+                val uuidsValues = volumeNames.indices.joinToString(", ") { "('${VolumeData.newUuid()}', ?)" }
+                // add uuids to old data
+                db.execSQL(
+                    "INSERT INTO $TABLE_NAME " +
+                            "WITH uuids($COLUMN_UUID, $COLUMN_NAME) AS (VALUES $uuidsValues) " +
+                            "SELECT $COLUMN_UUID, OLD.$COLUMN_NAME, $COLUMN_HIDDEN, $COLUMN_TYPE, $COLUMN_HASH, $COLUMN_IV " +
+                            "FROM OLD JOIN uuids ON OLD.name = uuids.name;",
+                    volumeNames
+                )
+                db.execSQL("DROP TABLE OLD;")
+            }
         }
     }
 
-    fun isVolumeSaved(volumeName: String, isHidden: Boolean): Boolean {
-        val cursor = readableDatabase.query(TABLE_NAME,
-            arrayOf(COLUMN_NAME), "$COLUMN_NAME=? AND $COLUMN_HIDDEN=?",
+    private fun extractVolumeData(cursor: Cursor): VolumeData {
+        return VolumeData(
+            cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_UUID)),
+            cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME)),
+            cursor.getShort(cursor.getColumnIndexOrThrow(COLUMN_HIDDEN)) == 1.toShort(),
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_TYPE))[0],
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)),
+            cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_IV))
+        )
+    }
+
+    private fun getVolumeCursor(volumeName: String, isHidden: Boolean): Cursor {
+        return readableDatabase.query(
+            TABLE_NAME, null,
+            "$COLUMN_NAME=? AND $COLUMN_HIDDEN=?",
             arrayOf(volumeName, (if (isHidden) 1 else 0).toString()),
             null, null, null
         )
+    }
+
+    fun getVolume(volumeName: String, isHidden: Boolean): VolumeData? {
+        val cursor = getVolumeCursor(volumeName, isHidden)
+        val volumeData = if (cursor.moveToNext()) {
+            extractVolumeData(cursor)
+        } else {
+            null
+        }
+        cursor.close()
+        return volumeData
+    }
+
+    fun isVolumeSaved(volumeName: String, isHidden: Boolean): Boolean {
+        val cursor = getVolumeCursor(volumeName, isHidden)
         val result = cursor.count > 0
         cursor.close()
         return result
     }
 
-    fun saveVolume(volume: SavedVolume): Boolean {
+    fun saveVolume(volume: VolumeData): Boolean {
         if (!isVolumeSaved(volume.name, volume.isHidden)) {
-            return (writableDatabase.insert(TABLE_NAME, null, contentValuesFromVolume(volume)) == 0.toLong())
+            return (writableDatabase.insert(TABLE_NAME, null, ContentValues().apply {
+                put(COLUMN_UUID, volume.uuid)
+                put(COLUMN_NAME, volume.name)
+                put(COLUMN_HIDDEN, volume.isHidden)
+                put(COLUMN_TYPE, byteArrayOf(volume.type))
+                put(COLUMN_HASH, volume.encryptedHash)
+                put(COLUMN_IV, volume.iv)
+            }) >= 0.toLong())
         }
         return false
     }
 
-    fun getVolumes(): List<SavedVolume> {
-        val list: MutableList<SavedVolume> = ArrayList()
+    fun getVolumes(): List<VolumeData> {
+        val list: MutableList<VolumeData> = ArrayList()
         val cursor = readableDatabase.rawQuery("SELECT * FROM $TABLE_NAME", null)
         while (cursor.moveToNext()){
-            list.add(
-                SavedVolume(
-                    cursor.getString(cursor.getColumnIndexOrThrow(COLUMN_NAME)),
-                    cursor.getShort(cursor.getColumnIndexOrThrow(COLUMN_HIDDEN)) == 1.toShort(),
-                    cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_TYPE))[0],
-                    cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)),
-                    cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_IV))
-                )
-            )
+            list.add(extractVolumeData(cursor))
         }
         cursor.close()
         return list
     }
 
-    fun isHashSaved(volumeName: String): Boolean {
-        val cursor = readableDatabase.query(TABLE_NAME, arrayOf(COLUMN_NAME, COLUMN_HASH), "$COLUMN_NAME=?", arrayOf(volumeName), null, null, null)
+    fun isHashSaved(volume: VolumeData): Boolean {
+        val cursor = readableDatabase.rawQuery("SELECT $COLUMN_HASH FROM $TABLE_NAME WHERE $COLUMN_UUID=?", arrayOf(volume.uuid))
         var isHashSaved = false
         if (cursor.moveToNext()) {
             if (cursor.getBlob(cursor.getColumnIndexOrThrow(COLUMN_HASH)) != null) {
@@ -130,33 +226,34 @@ class VolumeDatabase(private val context: Context): SQLiteOpenHelper(context, Co
         return isHashSaved
     }
 
-    fun addHash(volume: SavedVolume): Boolean {
-        return writableDatabase.update(TABLE_NAME, contentValuesFromVolume(volume), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
+    fun addHash(volume: VolumeData): Boolean {
+        return writableDatabase.update(TABLE_NAME, ContentValues().apply {
+            put(COLUMN_HASH, volume.encryptedHash)
+            put(COLUMN_IV, volume.iv)
+        }, "$COLUMN_UUID=?", arrayOf(volume.uuid)) > 0
     }
 
-    fun removeHash(volume: SavedVolume): Boolean {
+    fun removeHash(volume: VolumeData): Boolean {
         return writableDatabase.update(
-            TABLE_NAME, contentValuesFromVolume(
-            SavedVolume(
-                volume.name,
-                volume.isHidden,
-                volume.type,
-                null,
-                null
-            )
-        ), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
-    }
-
-    fun renameVolume(oldName: String, newName: String): Boolean {
-        return writableDatabase.update(TABLE_NAME,
+            TABLE_NAME,
             ContentValues().apply {
-                put(COLUMN_NAME, newName)
-            },
-            "$COLUMN_NAME=?",arrayOf(oldName)
+                put(COLUMN_HASH, null as ByteArray?)
+                put(COLUMN_IV, null as ByteArray?)
+            }, "$COLUMN_UUID=?", arrayOf(volume.uuid)
         ) > 0
     }
 
-    fun removeVolume(volumeName: String): Boolean {
-        return writableDatabase.delete(TABLE_NAME, "$COLUMN_NAME=?", arrayOf(volumeName)) > 0
+    fun renameVolume(volume: VolumeData, newName: String): Boolean {
+        return writableDatabase.update(
+            TABLE_NAME,
+            ContentValues().apply {
+                put(COLUMN_NAME, newName)
+            },
+            "$COLUMN_UUID=?", arrayOf(volume.uuid)
+        ) > 0
+    }
+
+    fun removeVolume(volume: VolumeData): Boolean {
+        return writableDatabase.delete(TABLE_NAME, "$COLUMN_UUID=?", arrayOf(volume.uuid)) > 0
     }
 }

app/src/main/java/sushi/hardcore/droidfs/VolumeManager.kt

@@ -0,0 +1,75 @@
+package sushi.hardcore.droidfs
+
+import android.content.Context
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import sushi.hardcore.droidfs.content_providers.VolumeProvider
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.Observable
+
+class VolumeManager(private val context: Context): Observable<VolumeManager.Observer>() {
+    interface Observer {
+        fun onVolumeStateChanged(volume: VolumeData) {}
+        fun onAllVolumesClosed() {}
+    }
+
+    private var id = 0
+    private val volumes = HashMap<Int, EncryptedVolume>()
+    private val volumesData = HashMap<VolumeData, Int>()
+    private val scopes = HashMap<Int, CoroutineScope>()
+
+    fun insert(volume: EncryptedVolume, data: VolumeData): Int {
+        volumes[id] = volume
+        volumesData[data] = id
+        observers.forEach { it.onVolumeStateChanged(data) }
+        VolumeProvider.notifyRootsChanged(context)
+        return id++
+    }
+
+    fun isOpen(volume: VolumeData): Boolean {
+        return volumesData.containsKey(volume)
+    }
+
+    fun getVolumeId(volume: VolumeData): Int? {
+        return volumesData[volume]
+    }
+
+    fun getVolume(id: Int): EncryptedVolume? {
+        return volumes[id]
+    }
+
+    fun listVolumes(): List<Pair<Int, VolumeData>> {
+        return volumesData.map { (data, id) -> Pair(id, data) }
+    }
+
+    fun getVolumeCount() = volumes.size
+
+    fun getCoroutineScope(volumeId: Int): CoroutineScope {
+        return scopes[volumeId] ?: CoroutineScope(SupervisorJob() + Dispatchers.IO).also { scopes[volumeId] = it }
+    }
+
+    fun closeVolume(id: Int) {
+        volumes.remove(id)?.let { volume ->
+            scopes[id]?.cancel()
+            volume.closeVolume()
+            volumesData.filter { it.value == id }.forEach { entry ->
+                volumesData.remove(entry.key)
+                observers.forEach { it.onVolumeStateChanged(entry.key) }
+            }
+            VolumeProvider.notifyRootsChanged(context)
+        }
+    }
+
+    fun closeAll() {
+        volumes.forEach {
+            scopes[it.key]?.cancel()
+            it.value.closeVolume()
+        }
+        volumes.clear()
+        volumesData.clear()
+        observers.forEach { it.onAllVolumesClosed() }
+        VolumeProvider.notifyRootsChanged(context)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeManagerApp.kt

@@ -0,0 +1,102 @@
+package sushi.hardcore.droidfs
+
+import android.app.Application
+import android.content.Intent
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.ProcessLifecycleOwner
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
+import sushi.hardcore.droidfs.util.AndroidUtils
+
+class VolumeManagerApp : Application(), DefaultLifecycleObserver {
+    companion object {
+        const val ACTION_CLOSE_ALL_VOLUMES = "close_all"
+    }
+
+    private val closingServiceIntent by lazy {
+        Intent(this, ClosingService::class.java)
+    }
+    private val keepAliveServiceStartIntent by lazy {
+        Intent(this, KeepAliveService::class.java).apply {
+            action = KeepAliveService.ACTION_START
+        }.putExtra(
+            "notification", KeepAliveService.NotificationDetails(
+                "KeepAlive",
+                getString(R.string.keep_alive_notification_title),
+                getString(R.string.keep_alive_notification_text),
+                KeepAliveService.NotificationDetails.NotificationAction(
+                    R.drawable.icon_lock,
+                    getString(R.string.close_all),
+                    ACTION_CLOSE_ALL_VOLUMES,
+                )
+            )
+        )
+    }
+    private val usfBackgroundDelegate = AndroidUtils.LiveBooleanPreference("usf_background", false) { _ ->
+        updateServicesStates()
+    }
+    private val usfBackground by usfBackgroundDelegate
+    private val usfKeepOpenDelegate = AndroidUtils.LiveBooleanPreference("usf_keep_open", false) { _ ->
+        updateServicesStates()
+    }
+    private val usfKeepOpen by usfKeepOpenDelegate
+    var isExporting = false
+    var isStartingExternalApp = false
+    val volumeManager = VolumeManager(this).also {
+        it.observe(object : VolumeManager.Observer {
+            override fun onVolumeStateChanged(volume: VolumeData) {
+                updateServicesStates()
+            }
+
+            override fun onAllVolumesClosed() {
+                stopKeepAliveService()
+                // closingService should not be running when this callback is triggered
+            }
+        })
+    }
+
+    override fun onCreate() {
+        super<Application>.onCreate()
+        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
+        AndroidUtils.LiveBooleanPreference.init(this, usfBackgroundDelegate, usfKeepOpenDelegate)
+    }
+
+    fun updateServicesStates() {
+        if (usfBackground && volumeManager.getVolumeCount() > 0) {
+            if (usfKeepOpen) {
+                stopService(closingServiceIntent)
+                if (!AndroidUtils.isServiceRunning(this@VolumeManagerApp, KeepAliveService::class.java)) {
+                    ContextCompat.startForegroundService(this, keepAliveServiceStartIntent)
+                }
+            } else {
+                stopKeepAliveService()
+                if (!AndroidUtils.isServiceRunning(this@VolumeManagerApp, ClosingService::class.java)) {
+                    startService(closingServiceIntent)
+                }
+            }
+        } else {
+            stopService(closingServiceIntent)
+            stopKeepAliveService()
+        }
+    }
+
+    private fun stopKeepAliveService() {
+        stopService(Intent(this, KeepAliveService::class.java))
+    }
+
+    override fun onResume(owner: LifecycleOwner) {
+        isStartingExternalApp = false
+    }
+
+    override fun onStop(owner: LifecycleOwner) {
+        if (!isStartingExternalApp) {
+            if (!usfBackground) {
+                volumeManager.closeAll()
+            }
+            if (!usfBackground || !isExporting) {
+                TemporaryFileProvider.instance.wipe()
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/VolumeOpener.kt

@@ -0,0 +1,227 @@
+package sushi.hardcore.droidfs
+
+import android.annotation.SuppressLint
+import android.os.Build
+import android.text.InputType
+import android.view.View
+import android.view.WindowManager
+import android.widget.Toast
+import androidx.fragment.app.FragmentActivity
+import androidx.lifecycle.lifecycleScope
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.Constants.DEFAULT_VOLUME_KEY
+import sushi.hardcore.droidfs.databinding.DialogOpenVolumeBinding
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
+import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
+import java.util.*
+
+class VolumeOpener(
+    private val activity: FragmentActivity,
+) {
+    interface VolumeOpenerCallbacks {
+        fun onHashStorageReset() {}
+        fun onVolumeOpened(id: Int)
+    }
+
+    private val volumeDatabase = VolumeDatabase(activity)
+    private var fingerprintProtector: FingerprintProtector? = null
+    private val sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity)
+    private val theme = (activity as BaseActivity).theme
+    var defaultVolumeName: String? = sharedPrefs.getString(DEFAULT_VOLUME_KEY, null)
+    private var dialogBinding: DialogOpenVolumeBinding? = null
+    private val volumeManager = (activity.application as VolumeManagerApp).volumeManager
+
+    init {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            fingerprintProtector = FingerprintProtector.new(activity, theme, volumeDatabase)
+        }
+    }
+
+    private fun getErrorMsg(result: EncryptedVolume.InitResult): String {
+        return if (result.errorStringId == 0) {
+            activity.getString(R.string.unknown_error_code, result.errorCode)
+        } else {
+            activity.getString(result.errorStringId)
+        }
+    }
+
+    @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
+    fun openVolume(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks) {
+        val volumeId = volumeManager.getVolumeId(volume)
+        if (volumeId == null) {
+            if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE && BuildConfig.GOCRYPTFS_DISABLED) {
+                Toast.makeText(activity, R.string.gocryptfs_disabled, Toast.LENGTH_SHORT).show()
+                return
+            } else if (volume.type == EncryptedVolume.CRYFS_VOLUME_TYPE && BuildConfig.CRYFS_DISABLED) {
+                Toast.makeText(activity, R.string.cryfs_disabled, Toast.LENGTH_SHORT).show()
+                return
+            }
+            var askForPassword = true
+            fingerprintProtector?.let { fingerprintProtector ->
+                volume.encryptedHash?.let { encryptedHash ->
+                    volume.iv?.let { iv ->
+                        askForPassword = false
+                        fingerprintProtector.listener = object : FingerprintProtector.Listener {
+                            override fun onHashStorageReset() {
+                                callbacks.onHashStorageReset()
+                            }
+                            override fun onPasswordHashDecrypted(hash: ByteArray) {
+                                object : LoadingTask<EncryptedVolume.InitResult>(activity, theme, R.string.loading_msg_open) {
+                                    override suspend fun doTask(): EncryptedVolume.InitResult {
+                                        val result = EncryptedVolume.init(volume, activity.filesDir.path, null, hash, null)
+                                        Arrays.fill(hash, 0)
+                                        return result
+                                    }
+                                }.startTask(activity.lifecycleScope) { result ->
+                                    val encryptedVolume = result.volume
+                                    if (encryptedVolume == null) {
+                                        CustomAlertDialogBuilder(activity, theme)
+                                            .setTitle(R.string.open_volume_failed)
+                                            .setMessage(getErrorMsg(result))
+                                            .setPositiveButton(R.string.ok, null)
+                                            .show()
+                                    } else {
+                                        callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                                    }
+                                }
+                            }
+                            override fun onPasswordHashSaved() {}
+                            override fun onFailed(pending: Boolean) {
+                                if (!pending && sharedPrefs.getBoolean("passwordFallback", true)) {
+                                    askForPassword(volume, isVolumeSaved, callbacks)
+                                }
+                            }
+                        }
+                        fingerprintProtector.loadPasswordHash(volume.shortName, encryptedHash, iv)
+                    }
+                }
+            }
+            if (askForPassword) {
+                askForPassword(volume, isVolumeSaved, callbacks)
+            }
+        } else {
+            callbacks.onVolumeOpened(volumeId)
+        }
+    }
+
+    fun wipeSensitive() {
+        dialogBinding?.editPassword?.text?.clear()
+    }
+
+    private fun onPasswordSubmitted(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks) {
+        if (dialogBinding!!.checkboxDefaultOpen.isChecked xor (defaultVolumeName == volume.name)) {
+            with (sharedPrefs.edit()) {
+                defaultVolumeName = if (dialogBinding!!.checkboxDefaultOpen.isChecked) {
+                    putString(DEFAULT_VOLUME_KEY, volume.name)
+                    volume.name
+                } else {
+                    remove(DEFAULT_VOLUME_KEY)
+                    null
+                }
+                apply()
+            }
+        }
+        val password = UIUtils.encodeEditTextContent(dialogBinding!!.editPassword)
+        val savePasswordHash = dialogBinding!!.checkboxSavePassword.isChecked
+        dialogBinding = null
+        // openVolumeWithPassword is responsible for wiping the password
+        openVolumeWithPassword(
+            volume,
+            password,
+            isVolumeSaved,
+            savePasswordHash,
+            callbacks,
+        )
+    }
+
+    private fun askForPassword(volume: VolumeData, isVolumeSaved: Boolean, callbacks: VolumeOpenerCallbacks, savePasswordHash: Boolean = false) {
+        dialogBinding = DialogOpenVolumeBinding.inflate(activity.layoutInflater)
+        if (isVolumeSaved) {
+            if (!sharedPrefs.getBoolean("usf_fingerprint", false) || fingerprintProtector == null || volume.encryptedHash != null) {
+                dialogBinding!!.checkboxSavePassword.visibility = View.GONE
+            } else {
+                dialogBinding!!.checkboxSavePassword.isChecked = savePasswordHash
+            }
+            dialogBinding!!.checkboxDefaultOpen.isChecked = defaultVolumeName == volume.name
+        } else {
+            dialogBinding!!.checkboxSavePassword.visibility = View.GONE
+            dialogBinding!!.checkboxDefaultOpen.visibility = View.GONE
+        }
+        val dialog = CustomAlertDialogBuilder(activity, theme)
+            .setTitle(activity.getString(R.string.open_dialog_title, volume.shortName))
+            .setView(dialogBinding!!.root)
+            .setNegativeButton(R.string.cancel, null)
+            .setPositiveButton(R.string.open) { _, _ ->
+                onPasswordSubmitted(volume, isVolumeSaved, callbacks)
+            }
+            .create()
+        dialogBinding!!.editPassword.apply {
+            setOnEditorActionListener { _, _, _ ->
+                dialog.dismiss()
+                onPasswordSubmitted(volume, isVolumeSaved, callbacks)
+                true
+            }
+            if (sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false)) {
+                inputType = InputType.TYPE_CLASS_NUMBER or InputType.TYPE_NUMBER_VARIATION_PASSWORD
+            }
+        }
+        dialog.window?.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
+        dialog.show()
+    }
+
+    private fun openVolumeWithPassword(volume: VolumeData, password: ByteArray, isVolumeSaved: Boolean, savePasswordHash: Boolean, callbacks: VolumeOpenerCallbacks) {
+        val returnedHash: ObjRef<ByteArray?>? = if (savePasswordHash) {
+            ObjRef(null)
+        } else {
+            null
+        }
+        object : LoadingTask<EncryptedVolume.InitResult>(activity, theme, R.string.loading_msg_open) {
+            override suspend fun doTask(): EncryptedVolume.InitResult {
+                val result = EncryptedVolume.init(volume, activity.filesDir.path, password, null, returnedHash)
+                Arrays.fill(password, 0)
+                return result
+            }
+        }.startTask(activity.lifecycleScope) { result ->
+            val encryptedVolume = result.volume
+            if (encryptedVolume == null) {
+                CustomAlertDialogBuilder(activity, theme)
+                    .setTitle(R.string.open_volume_failed)
+                    .setMessage(getErrorMsg(result))
+                    .setPositiveButton(R.string.ok) { _, _ ->
+                        if (result.worthRetry) {
+                            askForPassword(volume, isVolumeSaved, callbacks, savePasswordHash)
+                        }
+                    }
+                    .show()
+            } else {
+                val fingerprintProtector = fingerprintProtector
+                @SuppressLint("NewApi") // fingerprintProtector is non-null only when SDK_INT >= 23
+                if (savePasswordHash && returnedHash != null && fingerprintProtector != null) {
+                    fingerprintProtector.listener = object : FingerprintProtector.Listener {
+                        override fun onHashStorageReset() {
+                            callbacks.onHashStorageReset()
+                        }
+                        override fun onPasswordHashDecrypted(hash: ByteArray) {}
+                        override fun onPasswordHashSaved() {
+                            Arrays.fill(returnedHash.value!!, 0)
+                            callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                        }
+                        private var isClosed = false
+                        override fun onFailed(pending: Boolean) {
+                            if (!isClosed) {
+                                encryptedVolume.closeVolume()
+                                isClosed = true
+                            }
+                            Arrays.fill(returnedHash.value!!, 0)
+                        }
+                    }
+                    fingerprintProtector.savePasswordHash(volume, returnedHash.value!!)
+                } else {
+                    callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
+                }
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/adapters/ExplorerElementAdapter.kt

@@ -2,7 +2,6 @@ package sushi.hardcore.droidfs.adapters
 
 import android.annotation.SuppressLint
 import android.graphics.Bitmap
-import android.graphics.drawable.Drawable
 import android.util.LruCache
 import android.view.View
 import android.view.ViewGroup
@@ -11,13 +10,12 @@ import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.graphics.drawable.toBitmap
+import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.RecyclerView
-import com.bumptech.glide.Glide
-import com.bumptech.glide.request.target.DrawableImageViewTarget
-import com.bumptech.glide.request.transition.Transition
 import kotlinx.coroutines.*
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.FileTypes
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.ThumbnailsLoader
 import sushi.hardcore.droidfs.explorers.ExplorerElement
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.Stat
@@ -29,7 +27,7 @@ class ExplorerElementAdapter(
     val activity: AppCompatActivity,
     val encryptedVolume: EncryptedVolume?,
     private val listener: Listener,
-    val thumbnailMaxSize: Long,
+    thumbnailMaxSize: Long,
 ) : SelectableAdapter<ExplorerElement>(listener::onSelectionChanged) {
     val dateFormat: DateFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.getDefault())
     var explorerElements = listOf<ExplorerElement>()
@@ -40,11 +38,18 @@ class ExplorerElementAdapter(
         notifyDataSetChanged()
     }
     var isUsingListLayout = true
+    private var thumbnailsLoader: ThumbnailsLoader? = null
     private var thumbnailsCache: LruCache<String, Bitmap>? = null
+    var loadThumbnails = true
 
     init {
         if (encryptedVolume != null) {
-            thumbnailsCache = LruCache((Runtime.getRuntime().maxMemory() / 1024 / 8).toInt())
+            thumbnailsLoader = ThumbnailsLoader(activity, encryptedVolume, thumbnailMaxSize, activity.lifecycleScope).apply {
+                initialize()
+            }
+            thumbnailsCache = object : LruCache<String, Bitmap>((Runtime.getRuntime().maxMemory() / 4).toInt()) {
+                override fun sizeOf(key: String, value: Bitmap) = value.byteCount
+            }
         }
     }
 
@@ -114,40 +119,11 @@ class ExplorerElementAdapter(
     }
 
     class FileViewHolder(itemView: View) : RegularElementViewHolder(itemView) {
-        private var target: DrawableImageViewTarget? = null
-        private var job: Job? = null
-        private val scope = CoroutineScope(Dispatchers.IO)
-
-        private fun loadThumbnail(fullPath: String, adapter: ExplorerElementAdapter) {
-            adapter.encryptedVolume?.let { volume ->
-                job = scope.launch {
-                    volume.loadWholeFile(fullPath, maxSize = adapter.thumbnailMaxSize).first?.let {
-                        if (isActive) {
-                            withContext(Dispatchers.Main) {
-                                if (isActive && !adapter.activity.isFinishing) {
-                                    target = Glide.with(adapter.activity).load(it).skipMemoryCache(true).into(object : DrawableImageViewTarget(icon) {
-                                        override fun onResourceReady(
-                                            resource: Drawable,
-                                            transition: Transition<in Drawable>?
-                                        ) {
-                                            target = null
-                                            val bitmap = resource.toBitmap()
-                                            adapter.thumbnailsCache!!.put(fullPath, bitmap.copy(bitmap.config, true))
-                                            super.onResourceReady(resource, transition)
-                                        }
-                                    })
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-        }
+        private var task = -1
 
         fun cancelThumbnailLoading(adapter: ExplorerElementAdapter) {
-            job?.cancel()
-            target?.let {
-                Glide.with(adapter.activity).clear(it)
+            if (task != -1) {
+                adapter.thumbnailsLoader?.cancel(task)
             }
         }
 
@@ -159,8 +135,11 @@ class ExplorerElementAdapter(
                     if (thumbnail != null) {
                         icon.setImageBitmap(thumbnail)
                         setDefaultIcon = false
-                    } else {
-                        loadThumbnail(fullPath, adapter)
+                    } else if (adapter.loadThumbnails) {
+                        task = adapter.thumbnailsLoader!!.loadAsync(fullPath, icon) { resource ->
+                            val bitmap = resource.toBitmap()
+                            adapter.thumbnailsCache!!.put(fullPath, bitmap.copy(bitmap.config, true))
+                        }
                     }
                 }
             }
@@ -172,17 +151,17 @@ class ExplorerElementAdapter(
         override fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position, isSelected)
             when {
-                ConstValues.isImage(explorerElement.name) -> {
+                FileTypes.isImage(explorerElement.name) -> {
                     setThumbnailOrDefaultIcon(explorerElement.fullPath, R.drawable.icon_file_image)
                 }
-                ConstValues.isVideo(explorerElement.name) -> {
+                FileTypes.isVideo(explorerElement.name) -> {
                     setThumbnailOrDefaultIcon(explorerElement.fullPath, R.drawable.icon_file_video)
                 }
                 else -> icon.setImageResource(
                     when {
-                        ConstValues.isText(explorerElement.name) -> R.drawable.icon_file_text
-                        ConstValues.isPDF(explorerElement.name) -> R.drawable.icon_file_pdf
-                        ConstValues.isAudio(explorerElement.name) -> R.drawable.icon_file_audio
+                        FileTypes.isText(explorerElement.name) -> R.drawable.icon_file_text
+                        FileTypes.isPDF(explorerElement.name) -> R.drawable.icon_file_pdf
+                        FileTypes.isAudio(explorerElement.name) -> R.drawable.icon_file_audio
                         else -> R.drawable.icon_file_unknown
                     }
                 )

app/src/main/java/sushi/hardcore/droidfs/adapters/SelectableAdapter.kt

@@ -40,6 +40,12 @@ abstract class SelectableAdapter<T>(private val onSelectionChanged: (Int) -> Uni
         return true
     }
 
+    fun unselect(position: Int) {
+        selectedItems.remove(position)
+        onSelectionChanged(selectedItems.size)
+        notifyItemChanged(position)
+    }
+
     fun selectAll() {
         for (i in getItems().indices) {
             if (!selectedItems.contains(i) && isSelectable(i)) {

app/src/main/java/sushi/hardcore/droidfs/adapters/VolumeAdapter.kt

@@ -8,32 +8,46 @@ import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.LinearLayout
 import android.widget.TextView
+import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.SavedVolume
+import sushi.hardcore.droidfs.VolumeData
 import sushi.hardcore.droidfs.VolumeDatabase
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 
 class VolumeAdapter(
     private val context: Context,
     private val volumeDatabase: VolumeDatabase,
+    private val volumeManager: VolumeManager,
     private val allowSelection: Boolean,
     private val showReadOnly: Boolean,
     private val listener: Listener,
-) : SelectableAdapter<SavedVolume>(listener::onSelectionChanged) {
+) : SelectableAdapter<VolumeData>(listener::onSelectionChanged) {
     private val inflater: LayoutInflater = LayoutInflater.from(context)
-    lateinit var volumes: List<SavedVolume>
+    lateinit var volumes: List<VolumeData>
 
     init {
         reloadVolumes()
+        volumeManager.observe(object : VolumeManager.Observer {
+            override fun onVolumeStateChanged(volume: VolumeData) {
+                notifyItemChanged(volumes.indexOf(volume))
+            }
+
+            @SuppressLint("NotifyDataSetChanged")
+            override fun onAllVolumesClosed() {
+                notifyDataSetChanged()
+            }
+        })
     }
 
     interface Listener {
         fun onSelectionChanged(size: Int)
-        fun onVolumeItemClick(volume: SavedVolume, position: Int)
+        fun onVolumeItemClick(volume: VolumeData, position: Int)
         fun onVolumeItemLongClick()
     }
 
-    override fun getItems(): List<SavedVolume> {
+    override fun getItems(): List<VolumeData> {
         return volumes
     }
 
@@ -62,7 +76,7 @@ class VolumeAdapter(
             false
     }
 
-    fun onVolumeChanged(position: Int) {
+    fun onVolumeDataChanged(position: Int) {
         reloadVolumes()
         notifyItemChanged(position)
     }
@@ -79,23 +93,26 @@ class VolumeAdapter(
         fun bind(position: Int) {
             val volume = volumes[position]
             itemView.findViewById<TextView>(R.id.text_volume_name).text = volume.shortName
-            itemView.findViewById<ImageView>(R.id.image_icon).setImageResource(R.drawable.icon_volume)
             itemView.findViewById<TextView>(R.id.text_path).text = if (volume.isHidden)
                 context.getString(R.string.hidden_volume)
             else
                 volume.name
-            itemView.findViewById<ImageView>(R.id.icon_fingerprint).visibility = if (volume.encryptedHash == null) {
-                View.GONE
-            } else {
-                View.VISIBLE
-            }
-            itemView.findViewById<TextView>(R.id.text_read_only).apply {
-                visibility = if (volume.canWrite(context.filesDir.path))
-                    View.GONE
-                else {
-                    View.VISIBLE
-                }
-            }
+            itemView.findViewById<ImageView>(R.id.icon_unlocked).isVisible = volumeManager.isOpen(volume)
+            itemView.findViewById<ImageView>(R.id.icon_fingerprint).isVisible = volume.encryptedHash != null
+            itemView.findViewById<TextView>(R.id.text_info).text = context.getString(
+                if (volume.canWrite(context.filesDir.path)) {
+                    R.string.volume_type
+                } else if (volume.canRead(context.filesDir.path)) {
+                    R.string.volume_type_read_only
+                } else {
+                    R.string.volume_type_inaccessible
+                },
+                context.getString(if (volume.type == EncryptedVolume.GOCRYPTFS_VOLUME_TYPE) {
+                    R.string.gocryptfs
+                } else {
+                    R.string.cryfs
+                })
+            )
             setSelectable(itemView.findViewById<LinearLayout>(R.id.selectable_container), itemView, layoutPosition)
         }
     }

app/src/main/java/sushi/hardcore/droidfs/add_volume/Action.kt

@@ -1,6 +1,16 @@
 package sushi.hardcore.droidfs.add_volume
 
+import sushi.hardcore.droidfs.R
+
 enum class Action {
+    OPEN,
     ADD,
     CREATE,
+    ;
+
+    fun getStringResId() = when (this) {
+        OPEN -> R.string.open
+        ADD -> R.string.add_volume
+        CREATE -> R.string.create_volume
+    }
 }

app/src/main/java/sushi/hardcore/droidfs/add_volume/AddVolumeActivity.kt

@@ -2,42 +2,52 @@ package sushi.hardcore.droidfs.add_volume
 
 import android.os.Bundle
 import android.view.MenuItem
-import sushi.hardcore.droidfs.BaseActivity
-import sushi.hardcore.droidfs.ConstValues
-import sushi.hardcore.droidfs.R
+import androidx.activity.addCallback
+import sushi.hardcore.droidfs.*
 import sushi.hardcore.droidfs.databinding.ActivityAddVolumeBinding
+import sushi.hardcore.droidfs.explorers.ExplorerRouter
 
 class AddVolumeActivity: BaseActivity() {
 
     companion object {
-        const val RESULT_VOLUME_ADDED = 1
-        const val RESULT_HASH_STORAGE_RESET = 2
+        const val RESULT_USER_BACK = 10
     }
 
     private lateinit var binding: ActivityAddVolumeBinding
+    private lateinit var explorerRouter: ExplorerRouter
+    private lateinit var volumeOpener: VolumeOpener
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityAddVolumeBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        explorerRouter = ExplorerRouter(this, intent)
+        volumeOpener = VolumeOpener(this)
         if (savedInstanceState == null) {
             supportFragmentManager
                 .beginTransaction()
                 .add(
                     R.id.fragment_container,
-                    SelectPathFragment.newInstance(themeValue),
+                    SelectPathFragment.newInstance(theme, explorerRouter.pickMode),
                 )
                 .commit()
         }
+        onBackPressedDispatcher.addCallback(this) {
+            setResult(RESULT_USER_BACK)
+            isEnabled = false
+            onBackPressedDispatcher.onBackPressed()
+        }
     }
 
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         if (item.itemId == android.R.id.home) {
             if (supportFragmentManager.backStackEntryCount > 0)
                 supportFragmentManager.popBackStack()
-            else
+            else {
+                setResult(RESULT_USER_BACK)
                 finish()
+            }
         }
         return super.onOptionsItemSelected(item)
     }
@@ -52,24 +62,34 @@ class AddVolumeActivity: BaseActivity() {
         )
     }
 
-    fun onSelectedAlreadySavedVolume() {
+    fun startExplorer(volumeId: Int, volumeShortName: String) {
+        startActivity(explorerRouter.getExplorerIntent(volumeId, volumeShortName))
         finish()
     }
 
-    fun onVolumeAdded(hashStorageReset: Boolean) {
-        setResult(if (hashStorageReset) RESULT_HASH_STORAGE_RESET else RESULT_VOLUME_ADDED)
+    fun onVolumeAdded() {
+        setResult(RESULT_USER_BACK)
         finish()
     }
 
-    fun createVolume(volumePath: String, isHidden: Boolean) {
+    fun openVolume(volume: VolumeData, isVolumeKnown: Boolean) {
+        volumeOpener.openVolume(volume, isVolumeKnown, object : VolumeOpener.VolumeOpenerCallbacks {
+            override fun onVolumeOpened(id: Int) {
+                startExplorer(id, volume.shortName)
+            }
+        })
+    }
+
+    fun createVolume(volumePath: String, isHidden: Boolean, rememberVolume: Boolean) {
         supportFragmentManager
             .beginTransaction()
             .replace(
                 R.id.fragment_container, CreateVolumeFragment.newInstance(
-                    themeValue,
+                    theme,
                     volumePath,
                     isHidden,
-                    sharedPrefs.getBoolean(ConstValues.PIN_PASSWORDS_KEY, false),
+                    rememberVolume,
+                    sharedPrefs.getBoolean(Constants.PIN_PASSWORDS_KEY, false),
                     sharedPrefs.getBoolean("usf_fingerprint", false),
                 )
             )

app/src/main/java/sushi/hardcore/droidfs/add_volume/CreateVolumeFragment.kt

@@ -7,43 +7,70 @@ import android.text.InputType
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.AdapterView
 import android.widget.ArrayAdapter
+import android.widget.RadioButton
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.children
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
-import sushi.hardcore.droidfs.*
+import sushi.hardcore.droidfs.BuildConfig
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.FingerprintProtector
+import sushi.hardcore.droidfs.LoadingTask
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.VolumeDatabase
+import sushi.hardcore.droidfs.VolumeManagerApp
+import sushi.hardcore.droidfs.databinding.FileSystemRadioBinding
 import sushi.hardcore.droidfs.databinding.FragmentCreateVolumeBinding
 import sushi.hardcore.droidfs.filesystems.CryfsVolume
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.GocryptfsVolume
-import sushi.hardcore.droidfs.util.WidgetUtil
+import sushi.hardcore.droidfs.util.Compat
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.UIUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
-import java.util.*
-import kotlin.collections.ArrayList
+import java.util.Arrays
 
 class CreateVolumeFragment: Fragment() {
+    internal data class FileSystemInfo(val nameResource: Int, val detailsResource: Int, val ciphersResource: Int)
+
     companion object {
         private const val KEY_THEME_VALUE = "theme"
         private const val KEY_VOLUME_PATH = "path"
         private const val KEY_IS_HIDDEN = "hidden"
-        private const val KEY_PIN_PASSWORDS = ConstValues.PIN_PASSWORDS_KEY
+        private const val KEY_REMEMBER_VOLUME = "remember"
+        private const val KEY_PIN_PASSWORDS = Constants.PIN_PASSWORDS_KEY
         private const val KEY_USF_FINGERPRINT = "fingerprint"
+        
+        private val GOCRYPTFS_INFO = FileSystemInfo(
+            R.string.gocryptfs,
+            R.string.gocryptfs_details,
+            R.array.gocryptfs_encryption_ciphers,
+        )
+        private val CRYFS_INFO = FileSystemInfo(
+            R.string.cryfs,
+            R.string.cryfs_details,
+            R.array.cryfs_encryption_ciphers,
+        )
 
         fun newInstance(
-            themeValue: String,
+            theme: Theme,
             volumePath: String,
             isHidden: Boolean,
+            rememberVolume: Boolean,
             pinPasswords: Boolean,
             usfFingerprint: Boolean,
         ): CreateVolumeFragment {
             return CreateVolumeFragment().apply {
                 arguments = Bundle().apply {
-                    putString(KEY_THEME_VALUE, themeValue)
+                    putParcelable(KEY_THEME_VALUE, theme)
                     putString(KEY_VOLUME_PATH, volumePath)
                     putBoolean(KEY_IS_HIDDEN, isHidden)
+                    putBoolean(KEY_REMEMBER_VOLUME, rememberVolume)
                     putBoolean(KEY_PIN_PASSWORDS, pinPasswords)
                     putBoolean(KEY_USF_FINGERPRINT, usfFingerprint)
                 }
@@ -52,10 +79,11 @@ class CreateVolumeFragment: Fragment() {
     }
 
     private lateinit var binding: FragmentCreateVolumeBinding
-    private var themeValue = ConstValues.DEFAULT_THEME_VALUE
-    private val volumeTypes = ArrayList<String>(2)
+    private lateinit var theme: Theme
+    private val fileSystemInfos = ArrayList<FileSystemInfo>(2)
     private lateinit var volumePath: String
     private var isHiddenVolume: Boolean = false
+    private var rememberVolume: Boolean = false
     private var usfFingerprint: Boolean = false
     private lateinit var volumeDatabase: VolumeDatabase
     private var fingerprintProtector: FingerprintProtector? = null
@@ -72,31 +100,25 @@ class CreateVolumeFragment: Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         val pinPasswords = requireArguments().let { arguments ->
-            arguments.getString(KEY_THEME_VALUE)?.let { themeValue = it }
+            theme = Compat.getParcelable(arguments, KEY_THEME_VALUE)!!
             volumePath = arguments.getString(KEY_VOLUME_PATH)!!
             isHiddenVolume = arguments.getBoolean(KEY_IS_HIDDEN)
+            rememberVolume = arguments.getBoolean(KEY_REMEMBER_VOLUME)
             usfFingerprint = arguments.getBoolean(KEY_USF_FINGERPRINT)
             arguments.getBoolean(KEY_PIN_PASSWORDS)
         }
         volumeDatabase = VolumeDatabase(requireContext())
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-            fingerprintProtector = FingerprintProtector.new(requireActivity(), themeValue, volumeDatabase)
+            fingerprintProtector = FingerprintProtector.new(requireActivity(), theme, volumeDatabase)
         }
-        if (!usfFingerprint || fingerprintProtector == null) {
+        if (!rememberVolume || !usfFingerprint || fingerprintProtector == null) {
             binding.checkboxSavePassword.visibility = View.GONE
         }
         if (!BuildConfig.GOCRYPTFS_DISABLED) {
-            volumeTypes.add(resources.getString(R.string.gocryptfs))
+            fileSystemInfos.add(GOCRYPTFS_INFO)
         }
         if (!BuildConfig.CRYFS_DISABLED) {
-            volumeTypes.add(resources.getString(R.string.cryfs))
-        }
-        binding.spinnerVolumeType.adapter = ArrayAdapter(
-            requireContext(),
-            android.R.layout.simple_spinner_item,
-            volumeTypes
-        ).apply {
-            setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
+            fileSystemInfos.add(CRYFS_INFO)
         }
         val encryptionCipherAdapter = ArrayAdapter(
             requireContext(),
@@ -105,23 +127,29 @@ class CreateVolumeFragment: Fragment() {
         ).apply {
             setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
         }
-        binding.spinnerVolumeType.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
-            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
-                val ciphersArray = if (volumeTypes[position] == resources.getString(R.string.gocryptfs)) {
-                    if (usfFingerprint && fingerprintProtector != null) {
-                        binding.checkboxSavePassword.visibility = View.VISIBLE
+        for ((i, fs) in fileSystemInfos.iterator().withIndex()) {
+            with(FileSystemRadioBinding.inflate(layoutInflater)) {
+                title.text = getString(fs.nameResource)
+                details.text = getString(fs.detailsResource)
+                radio.isChecked = i == 0
+                root.setOnClickListener {
+                    radio.performClick()
+                }
+                radio.setOnCheckedChangeListener { _, isChecked ->
+                    if (isChecked) {
+                        with(encryptionCipherAdapter) {
+                            clear()
+                            addAll(resources.getStringArray(fs.ciphersResource).asList())
+                        }
+                        binding.radioGroupFilesystems.children.forEach {
+                            if (it != root) {
+                                it.findViewById<RadioButton>(R.id.radio).isChecked = false
+                            }
+                        }
                     }
-                    R.array.gocryptfs_encryption_ciphers
-                } else {
-                    binding.checkboxSavePassword.visibility = View.GONE
-                    R.array.cryfs_encryption_ciphers
-                }
-                with(encryptionCipherAdapter) {
-                    clear()
-                    addAll(resources.getStringArray(ciphersArray).asList())
                 }
+                binding.radioGroupFilesystems.addView(root)
             }
-            override fun onNothingSelected(parent: AdapterView<*>?) {}
         }
         binding.spinnerCipher.adapter = encryptionCipherAdapter
         if (pinPasswords) {
@@ -143,102 +171,137 @@ class CreateVolumeFragment: Fragment() {
         (activity as AddVolumeActivity).onFragmentLoaded(false)
     }
 
-    private fun saveVolume(success: Boolean, volumeType: Byte): SavedVolume? {
-        return if (success) {
-            val volumeName = if (isHiddenVolume) File(volumePath).name else volumePath
-            val volume = SavedVolume(volumeName, isHiddenVolume, volumeType)
-            volumeDatabase.apply {
-                if (isVolumeSaved(volumeName, isHiddenVolume)) // cleaning old saved path
-                    removeVolume(volumeName)
-                saveVolume(volume)
+    private fun getSelectedFileSystemIndex(): Int {
+        for ((i, child) in binding.radioGroupFilesystems.children.iterator().withIndex()) {
+            if (child.findViewById<RadioButton>(R.id.radio).isChecked) {
+                return i
             }
-            volume
-        } else {
-            null
         }
+        return -1
     }
 
     private fun createVolume() {
-        val password = WidgetUtil.encodeEditTextContent(binding.editPassword)
-        val passwordConfirm = WidgetUtil.encodeEditTextContent(binding.editPasswordConfirm)
+        val password = UIUtils.encodeEditTextContent(binding.editPassword)
+        val passwordConfirm = UIUtils.encodeEditTextContent(binding.editPasswordConfirm)
         if (!password.contentEquals(passwordConfirm)) {
             Toast.makeText(requireContext(), R.string.passwords_mismatch, Toast.LENGTH_SHORT).show()
             Arrays.fill(password, 0)
             Arrays.fill(passwordConfirm, 0)
         } else {
             Arrays.fill(passwordConfirm, 0)
-            var returnedHash: ByteArray? = null
-            if (binding.checkboxSavePassword.isChecked)
-                returnedHash = ByteArray(GocryptfsVolume.KeyLen)
-            object: LoadingTask<SavedVolume?>(requireActivity() as AppCompatActivity, themeValue, R.string.loading_msg_create) {
-                override suspend fun doTask(): SavedVolume? {
+            val returnedHash: ObjRef<ByteArray?>? = if (binding.checkboxSavePassword.isChecked) {
+                ObjRef(null)
+            } else {
+                null
+            }
+            val encryptedVolume = ObjRef<EncryptedVolume?>(null)
+            object: LoadingTask<Byte>(requireActivity() as AppCompatActivity, theme, R.string.loading_msg_create) {
+                private fun generateResult(success: Boolean, volumeType: Byte): Byte {
+                    return if (success) {
+                        volumeType
+                    } else {
+                        -1
+                    }
+                }
+
+                override suspend fun doTask(): Byte {
                     val volumeFile = File(volumePath)
                     if (!volumeFile.exists())
                         volumeFile.mkdirs()
-                    val volume = if (volumeTypes[binding.spinnerVolumeType.selectedItemPosition] == resources.getString(R.string.gocryptfs)) {
+                    val result = if (fileSystemInfos[getSelectedFileSystemIndex()] == GOCRYPTFS_INFO) {
                         val xchacha = when (binding.spinnerCipher.selectedItemPosition) {
-                            0 -> 0
-                            1 -> 1
-                            else -> -1
+                            0 -> -1   // auto
+                            1 -> 0    // AES-GCM
+                            else -> 1 // XChaCha20-Poly1305
                         }
-                        saveVolume(GocryptfsVolume.createVolume(
+                        generateResult(GocryptfsVolume.createAndOpenVolume(
                             volumePath,
                             password,
                             false,
                             xchacha,
-                            GocryptfsVolume.ScryptDefaultLogN,
-                            ConstValues.CREATOR,
-                            returnedHash
+                            returnedHash?.apply {
+                                value = ByteArray(GocryptfsVolume.KeyLen)
+                            }?.value,
+                            encryptedVolume,
                         ), EncryptedVolume.GOCRYPTFS_VOLUME_TYPE)
                     } else {
-                        saveVolume(CryfsVolume.create(
+                        encryptedVolume.value = CryfsVolume.create(
                             volumePath,
                             CryfsVolume.getLocalStateDir(activity.filesDir.path),
                             password,
-                            resources.getStringArray(R.array.cryfs_encryption_ciphers)[binding.spinnerCipher.selectedItemPosition]
-                        ), EncryptedVolume.CRYFS_VOLUME_TYPE)
+                            returnedHash,
+                            resources.getStringArray(R.array.cryfs_encryption_ciphers)[binding.spinnerCipher.selectedItemPosition],
+                        )
+                        generateResult(encryptedVolume.value != null, EncryptedVolume.CRYFS_VOLUME_TYPE)
                     }
                     Arrays.fill(password, 0)
-                    return volume
+                    return result
                 }
-            }.startTask(lifecycleScope) { volume ->
-                if (volume == null) {
-                    CustomAlertDialogBuilder(requireContext(), themeValue)
+            }.startTask(lifecycleScope) { result ->
+                if (result.compareTo(-1) == 0) {
+                    CustomAlertDialogBuilder(requireContext(), theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.create_volume_failed)
                         .setPositiveButton(R.string.ok, null)
                         .show()
                 } else {
+                    val volumeName = if (isHiddenVolume) File(volumePath).name else volumePath
+                    val volume = VolumeData(VolumeData.newUuid(), volumeName, isHiddenVolume, result)
+                    var isVolumeSaved = false
+                    volumeDatabase.apply {
+                        if (isVolumeSaved(volumeName, isHiddenVolume)) // cleaning old saved path
+                            removeVolume(volume)
+                        if (rememberVolume) {
+                            isVolumeSaved = saveVolume(volume)
+                        }
+                    }
+                    val volumeId = encryptedVolume.value?.let {
+                        (activity?.application as VolumeManagerApp).volumeManager.insert(it, volume)
+                    }
                     @SuppressLint("NewApi") // if fingerprintProtector is null checkboxSavePassword is hidden
-                    if (binding.checkboxSavePassword.isChecked && returnedHash != null) {
+                    if (isVolumeSaved && binding.checkboxSavePassword.isChecked && returnedHash != null) {
                         fingerprintProtector!!.let {
                             it.listener = object : FingerprintProtector.Listener {
                                 override fun onHashStorageReset() {
                                     hashStorageReset = true
                                     // retry
-                                    it.savePasswordHash(volume, returnedHash)
+                                    it.savePasswordHash(volume, returnedHash.value!!)
                                 }
                                 override fun onPasswordHashDecrypted(hash: ByteArray) {} // shouldn't happen here
                                 override fun onPasswordHashSaved() {
-                                    Arrays.fill(returnedHash, 0)
-                                    onVolumeCreated()
+                                    Arrays.fill(returnedHash.value!!, 0)
+                                    onVolumeCreated(volumeId, volume.shortName)
                                 }
                                 override fun onFailed(pending: Boolean) {
                                     if (!pending) {
-                                        Arrays.fill(returnedHash, 0)
-                                        onVolumeCreated()
+                                        Arrays.fill(returnedHash.value!!, 0)
+                                        onVolumeCreated(volumeId, volume.shortName)
                                     }
                                 }
                             }
-                            it.savePasswordHash(volume, returnedHash)
+                            it.savePasswordHash(volume, returnedHash.value!!)
                         }
-                    } else onVolumeCreated()
+                    } else {
+                        onVolumeCreated(volumeId, volume.shortName)
+                    }
                 }
             }
         }
     }
 
-    private fun onVolumeCreated() {
-        (activity as AddVolumeActivity).onVolumeAdded(hashStorageReset)
+    private fun onVolumeCreated(id: Int?, volumeShortName: String) {
+        (activity as AddVolumeActivity).apply {
+            if (id == null) {
+                finish()
+            } else {
+                startExplorer(id, volumeShortName)
+            }
+        }
+    }
+
+    override fun onStop() {
+        super.onStop()
+        binding.editPassword.text.clear()
+        binding.editPasswordConfirm.text.clear()
     }
 }

app/src/main/java/sushi/hardcore/droidfs/add_volume/SelectPathFragment.kt

@@ -2,35 +2,57 @@ package sushi.hardcore.droidfs.add_volume
 
 import android.Manifest
 import android.annotation.SuppressLint
+import android.content.Context
+import android.content.Intent
+import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.net.Uri
 import android.os.Build
 import android.os.Bundle
+import android.os.Environment
+import android.provider.Settings
 import android.text.Editable
 import android.text.TextWatcher
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.core.content.ContextCompat
+import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
-import sushi.hardcore.droidfs.*
+import androidx.fragment.app.viewModels
+import androidx.lifecycle.ViewModel
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.VolumeDatabase
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.databinding.DialogSdcardErrorBinding
 import sushi.hardcore.droidfs.databinding.FragmentSelectPathBinding
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.Compat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 
 class SelectPathFragment: Fragment() {
+    internal class InputViewModel: ViewModel() {
+        var showEditText = false
+    }
+
     companion object {
         private const val KEY_THEME_VALUE = "theme"
+        private const val KEY_PICK_MODE = "pick"
 
-        fun newInstance(themeValue: String): SelectPathFragment {
+        fun newInstance(theme: Theme, pickMode: Boolean): SelectPathFragment {
             return SelectPathFragment().apply {
                 arguments = Bundle().apply {
-                    putString(KEY_THEME_VALUE, themeValue)
+                    putParcelable(KEY_THEME_VALUE, theme)
+                    putBoolean(KEY_PICK_MODE, pickMode)
                 }
             }
         }
@@ -39,9 +61,9 @@ class SelectPathFragment: Fragment() {
     private lateinit var binding: FragmentSelectPathBinding
     private val askStoragePermissions = registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { result ->
         if (result[Manifest.permission.READ_EXTERNAL_STORAGE] == true && result[Manifest.permission.WRITE_EXTERNAL_STORAGE] == true)
-            PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
+            launchPickDirectory()
         else
-            CustomAlertDialogBuilder(requireContext(), themeValue)
+            CustomAlertDialogBuilder(requireContext(), theme)
                 .setTitle(R.string.storage_perm_denied)
                 .setMessage(R.string.storage_perm_denied_msg)
                 .setCancelable(false)
@@ -52,8 +74,16 @@ class SelectPathFragment: Fragment() {
         if (uri != null)
             onDirectoryPicked(uri)
     }
-    private var themeValue = ConstValues.DEFAULT_THEME_VALUE
+    private lateinit var app: VolumeManagerApp
+    private lateinit var theme: Theme
     private lateinit var volumeDatabase: VolumeDatabase
+    private lateinit var filesDir: String
+    private lateinit var sharedPrefs: SharedPreferences
+    private var pickMode = false
+    private var originalRememberVolume = true
+    private var currentVolumeData: VolumeData? = null
+    private var volumeAction: Action? = null
+    private val inputViewModel: InputViewModel by viewModels()
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -65,196 +95,289 @@ class SelectPathFragment: Fragment() {
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        app = requireActivity().application as VolumeManagerApp
+        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(requireContext())
+        originalRememberVolume = sharedPrefs.getBoolean(Constants.REMEMBER_VOLUME_KEY, true)
+        binding.switchRemember.isChecked = originalRememberVolume
         arguments?.let { arguments ->
-            arguments.getString(KEY_THEME_VALUE)?.let { themeValue = it }
+            theme = Compat.getParcelable(arguments, KEY_THEME_VALUE)!!
+            pickMode = arguments.getBoolean(KEY_PICK_MODE)
         }
         volumeDatabase = VolumeDatabase(requireContext())
+        filesDir = requireContext().filesDir.path
         binding.containerHiddenVolume.setOnClickListener {
             binding.switchHiddenVolume.performClick()
         }
         binding.switchHiddenVolume.setOnClickListener {
-            showRightSection()
+            updateUi()
         }
         binding.buttonPickDirectory.setOnClickListener {
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-                if (ContextCompat.checkSelfPermission(
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                if (Environment.isExternalStorageManager()) {
+                    launchPickDirectory()
+                } else {
+                    app.isStartingExternalApp = true
+                    startActivity(Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION, Uri.parse("package:"+requireContext().packageName)))
+                }
+            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                if (
+                    ContextCompat.checkSelfPermission(
                         requireContext(),
                         Manifest.permission.READ_EXTERNAL_STORAGE
-                    ) +
-                    ContextCompat.checkSelfPermission(
+                    ) + ContextCompat.checkSelfPermission(
                         requireContext(),
                         Manifest.permission.WRITE_EXTERNAL_STORAGE
                     ) == PackageManager.PERMISSION_GRANTED
-                )
-                    PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
-                else
+                ) {
+                    launchPickDirectory()
+                } else {
+                    app.isStartingExternalApp = true
                     askStoragePermissions.launch(
                         arrayOf(
                             Manifest.permission.READ_EXTERNAL_STORAGE,
                             Manifest.permission.WRITE_EXTERNAL_STORAGE
                         )
                     )
-            } else
-                PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
+                }
+            } else {
+                launchPickDirectory()
+            }
+        }
+        binding.buttonEnterPath.setOnClickListener {
+            inputViewModel.showEditText = true
+            updateUi()
+            binding.editVolumeName.requestFocus()
+            (app.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager).showSoftInput(
+                binding.editVolumeName,
+                InputMethodManager.SHOW_IMPLICIT
+            )
         }
-        var isVolumeAlreadySaved = false
-        var volumeAction: Action? = null
         binding.editVolumeName.addTextChangedListener(object: TextWatcher {
             override fun afterTextChanged(s: Editable?) {}
             override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
-            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
-                isVolumeAlreadySaved = volumeDatabase.isVolumeSaved(s.toString(), binding.switchHiddenVolume.isChecked)
-                if (isVolumeAlreadySaved)
-                    binding.textWarning.apply {
-                        text = getString(R.string.volume_alread_saved)
-                        visibility = View.VISIBLE
-                    }
-                else
-                    binding.textWarning.visibility = View.GONE
-                val path = File(getCurrentVolumePath())
-                volumeAction = if (path.isDirectory)
-                    if (path.list()?.isEmpty() == true) Action.CREATE else Action.ADD
-                else
-                    Action.CREATE
-                binding.buttonAction.text = getString(when (volumeAction) {
-                    Action.CREATE -> R.string.create
-                    else -> R.string.add_volume
-                })
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
+                updateUi(s)
             }
         })
-        binding.editVolumeName.setOnEditorActionListener { _, _, _ -> onPathSelected(isVolumeAlreadySaved, volumeAction); true }
-        binding.buttonAction.setOnClickListener { onPathSelected(isVolumeAlreadySaved, volumeAction) }
+        binding.switchRemember.setOnCheckedChangeListener { _, _ -> updateUi() }
+        binding.editVolumeName.setOnEditorActionListener { _, _, _ ->
+            if (binding.editVolumeName.text.isEmpty()) {
+                Toast.makeText(
+                    requireContext(),
+                    if (binding.switchHiddenVolume.isChecked) R.string.empty_volume_name else R.string.empty_volume_path,
+                    Toast.LENGTH_SHORT
+                ).show()
+            } else {
+                onPathSelected()
+            }
+            true
+        }
+        binding.buttonAction.setOnClickListener { onPathSelected() }
     }
 
     override fun onViewStateRestored(savedInstanceState: Bundle?) {
         super.onViewStateRestored(savedInstanceState)
         (activity as AddVolumeActivity).onFragmentLoaded(true)
-        showRightSection()
     }
 
-    private fun showRightSection() {
-        if (binding.switchHiddenVolume.isChecked) {
-            binding.textLabel.text = requireContext().getString(R.string.volume_name_label)
-            binding.editVolumeName.hint = requireContext().getString(R.string.volume_name_hint)
-            binding.buttonPickDirectory.visibility = View.GONE
-        } else {
-            binding.textLabel.text = requireContext().getString(R.string.volume_path_label)
-            binding.editVolumeName.hint = requireContext().getString(R.string.volume_path_hint)
-            binding.buttonPickDirectory.visibility = View.VISIBLE
+    private fun launchPickDirectory() {
+        app.isStartingExternalApp = true
+        PathUtils.safePickDirectory(pickDirectory, requireContext(), theme)
+    }
+
+    private fun updateUi(volumeName: CharSequence = binding.editVolumeName.text) {
+        var warning = -1
+        fun updateWarning() {
+            if (warning == -1) {
+                binding.textWarning.isVisible = false
+            } else {
+                binding.textWarning.isVisible = true
+                binding.textWarning.text = getString(warning)
+            }
         }
+
+        val hidden = binding.switchHiddenVolume.isChecked
+        binding.editVolumeName.isVisible = hidden || inputViewModel.showEditText
+        binding.buttonPickDirectory.isVisible = !hidden
+        binding.textOr.isVisible = !hidden && !inputViewModel.showEditText
+        binding.buttonEnterPath.isVisible = !hidden && !inputViewModel.showEditText
+        if (hidden) {
+            binding.textLabel.text = getString(R.string.volume_name_label)
+            binding.editVolumeName.hint = getString(R.string.volume_name_hint)
+        } else {
+            binding.textLabel.text = getString(R.string.volume_path_label)
+            binding.editVolumeName.hint = getString(R.string.volume_path_hint)
+        }
+        if (hidden && volumeName.contains(PathUtils.SEPARATOR)) {
+            warning = R.string.error_slash_in_name
+        }
+        // exit early if possible to avoid filesystem queries
+        if (volumeName.isEmpty() || warning != -1 || (!hidden && !inputViewModel.showEditText)) {
+            binding.buttonAction.isVisible = false
+            binding.switchRemember.isVisible = false
+            updateWarning()
+            return
+        }
+        val path = File(getCurrentVolumePath())
+        volumeAction = if (path.isDirectory) {
+            if (path.list()?.isEmpty() == true) {
+                Action.CREATE
+            } else if (pickMode || !binding.switchRemember.isChecked) {
+                Action.OPEN
+            } else {
+                Action.ADD
+            }
+        } else {
+            Action.CREATE
+        }
+        val valid = !(volumeAction == Action.CREATE && pickMode)
+        binding.switchRemember.isVisible = valid
+        binding.buttonAction.isVisible = valid
+        if (valid) {
+            binding.buttonAction.text = getString(volumeAction!!.getStringResId())
+            currentVolumeData = if (volumeAction == Action.CREATE) {
+                null
+            } else {
+                volumeDatabase.getVolume(volumeName.toString(), hidden)
+            }
+            if (currentVolumeData != null) {
+                warning = R.string.volume_alread_saved
+            }
+        } else {
+            warning = R.string.choose_existing_volume
+        }
+        updateWarning()
     }
 
     private fun onDirectoryPicked(uri: Uri) {
         val path = PathUtils.getFullPathFromTreeUri(uri, requireContext())
-        if (path != null)
-            binding.editVolumeName.setText(path)
-        else
-            CustomAlertDialogBuilder(requireContext(), themeValue)
+        if (path == null) {
+            CustomAlertDialogBuilder(requireContext(), theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.path_error)
                 .setPositiveButton(R.string.ok, null)
                 .show()
+        } else {
+            inputViewModel.showEditText = true
+            binding.editVolumeName.setText(path)
+        }
     }
 
     private fun getCurrentVolumePath(): String {
         return if (binding.switchHiddenVolume.isChecked)
-            SavedVolume.getHiddenVolumeFullPath(requireContext().filesDir.path, binding.editVolumeName.text.toString())
+            VolumeData.getHiddenVolumeFullPath(filesDir, binding.editVolumeName.text.toString())
         else
             binding.editVolumeName.text.toString()
     }
 
-    private fun onPathSelected(isVolumeAlreadySaved: Boolean, volumeAction: Action?) {
-        if (isVolumeAlreadySaved) {
-            (activity as AddVolumeActivity).onSelectedAlreadySavedVolume()
-        } else {
-            if (binding.switchHiddenVolume.isChecked && volumeAction == Action.CREATE) {
-                CustomAlertDialogBuilder(requireContext(), themeValue)
+    private fun onPathSelected() {
+        if (binding.switchRemember.isChecked != originalRememberVolume) {
+            with(sharedPrefs.edit()) {
+                putBoolean(Constants.REMEMBER_VOLUME_KEY, binding.switchRemember.isChecked)
+                apply()
+            }
+        }
+        if (currentVolumeData == null) { // volume not known
+            val currentVolumeValue = binding.editVolumeName.text.toString()
+            val isHidden = binding.switchHiddenVolume.isChecked
+            if (isHidden && currentVolumeValue.contains(PathUtils.SEPARATOR)) {
+                Toast.makeText(requireContext(), R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
+            } else if (isHidden && volumeAction == Action.CREATE) {
+                CustomAlertDialogBuilder(requireContext(), theme)
                     .setTitle(R.string.warning)
                     .setMessage(R.string.hidden_volume_warning)
                     .setPositiveButton(R.string.ok) { _, _ ->
-                        addVolume(volumeAction)
+                        onNewVolumeSelected(currentVolumeValue, isHidden)
                     }
                     .show()
             } else {
-                addVolume(volumeAction)
+                onNewVolumeSelected(currentVolumeValue, isHidden)
+            }
+        } else {
+            with (activity as AddVolumeActivity) {
+                if (volumeAction!! == Action.OPEN) {
+                    openVolume(currentVolumeData!!, true)
+                } else {
+                    onVolumeAdded()
+                }
             }
         }
     }
 
-    private fun addVolume(volumeAction: Action?) {
-        val currentVolumeValue = binding.editVolumeName.text.toString()
-        val isHidden = binding.switchHiddenVolume.isChecked
-        if (currentVolumeValue.isEmpty()) {
-            Toast.makeText(
-                requireContext(),
-                if (isHidden) R.string.enter_volume_name else R.string.enter_volume_path,
-                Toast.LENGTH_SHORT
-            ).show()
-        } else if (isHidden && currentVolumeValue.contains(PathUtils.SEPARATOR)) {
-            Toast.makeText(requireContext(), R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
-        } else {
-            val volumePath = getCurrentVolumePath()
-            when (volumeAction!!) {
-                Action.CREATE -> {
-                    val volumeFile = File(volumePath)
-                    var goodDirectory = false
-                    if (volumeFile.isFile) {
-                        Toast.makeText(requireContext(), R.string.error_is_file, Toast.LENGTH_SHORT).show()
-                    } else if (volumeFile.isDirectory) {
-                        val dirContent = volumeFile.list()
-                        if (dirContent != null) {
-                            if (dirContent.isEmpty()) {
-                                if (volumeFile.canWrite())
-                                    goodDirectory = true
-                                else
-                                    errorDirectoryNotWritable(volumePath)
-                            } else
-                                Toast.makeText(requireContext(), R.string.dir_not_empty, Toast.LENGTH_SHORT).show()
-                        } else
-                            Toast.makeText(requireContext(), R.string.listdir_null_error_msg, Toast.LENGTH_SHORT).show()
-                    } else {
-                        if (File(PathUtils.getParentPath(volumePath)).canWrite())
+    private fun onNewVolumeSelected(currentVolumeValue: String, isHidden: Boolean) {
+        val volumePath = getCurrentVolumePath()
+        if (volumeAction!! == Action.CREATE) {
+            val volumeFile = File(volumePath)
+            var goodDirectory = false
+            if (volumeFile.isFile) {
+                Toast.makeText(requireContext(), R.string.error_is_file, Toast.LENGTH_SHORT).show()
+            } else if (volumeFile.isDirectory) {
+                val dirContent = volumeFile.list()
+                if (dirContent != null) {
+                    if (dirContent.isEmpty()) {
+                        if (volumeFile.canWrite()) {
                             goodDirectory = true
-                        else
+                        } else {
                             errorDirectoryNotWritable(volumePath)
-                    }
-                    if (goodDirectory)
-                        (activity as AddVolumeActivity).createVolume(volumePath, isHidden)
-                }
-                Action.ADD -> {
-                    val volumeType = EncryptedVolume.getVolumeType(volumePath)
-                    if (volumeType < 0) {
-                        CustomAlertDialogBuilder(requireContext(), themeValue)
-                            .setTitle(R.string.error)
-                            .setMessage(R.string.error_not_a_volume)
-                            .setPositiveButton(R.string.ok, null)
-                            .show()
-                    } else if (!File(volumePath).canWrite()) {
-                        val dialog = CustomAlertDialogBuilder(requireContext(), themeValue)
-                            .setTitle(R.string.warning)
-                            .setCancelable(false)
-                            .setPositiveButton(R.string.ok) { _, _ -> addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType) }
-                        if (PathUtils.isPathOnExternalStorage(volumePath, requireContext()))
-                            dialog.setView(
-                                DialogSdcardErrorBinding.inflate(layoutInflater).apply {
-                                    path.text = PathUtils.getPackageDataFolder(requireContext())
-                                    footer.text = getString(R.string.sdcard_error_add_footer)
-                                }.root
-                            )
-                        else
-                            dialog.setMessage(R.string.add_cant_write_warning)
-                        dialog.show()
+                        }
                     } else {
-                        addVolume(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType)
+                        Toast.makeText(requireContext(), R.string.dir_not_empty, Toast.LENGTH_SHORT)
+                            .show()
                     }
+                } else {
+                    Toast.makeText(
+                        requireContext(),
+                        R.string.listdir_null_error_msg,
+                        Toast.LENGTH_SHORT
+                    ).show()
                 }
+            } else {
+                if (File(PathUtils.getParentPath(volumePath)).canWrite()) {
+                    goodDirectory = true
+                } else {
+                    errorDirectoryNotWritable(volumePath)
+                }
+            }
+            if (goodDirectory) {
+                (activity as AddVolumeActivity).createVolume(
+                    volumePath,
+                    isHidden,
+                    binding.switchRemember.isChecked
+                )
+            }
+        } else {
+            val volumeType = EncryptedVolume.getVolumeType(volumePath)
+            if (volumeType < 0) {
+                CustomAlertDialogBuilder(requireContext(), theme)
+                    .setTitle(R.string.error)
+                    .setMessage(R.string.error_not_a_volume)
+                    .setPositiveButton(R.string.ok, null)
+                    .show()
+            } else if (!File(volumePath).canWrite()) {
+                val dialog = CustomAlertDialogBuilder(requireContext(), theme)
+                    .setTitle(R.string.warning)
+                    .setCancelable(false)
+                    .setPositiveButton(R.string.ok) { _, _ -> onExistingVolumeSelected(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType) }
+                if (PathUtils.isPathOnExternalStorage(volumePath, requireContext())) {
+                    dialog.setView(
+                        DialogSdcardErrorBinding.inflate(layoutInflater).apply {
+                            path.text = PathUtils.getPackageDataFolder(requireContext())
+                            footer.text = getString(R.string.sdcard_error_add_footer)
+                        }.root
+                    )
+                } else {
+                    dialog.setMessage(R.string.add_cant_write_warning)
+                }
+                dialog.show()
+            } else {
+                onExistingVolumeSelected(if (isHidden) currentVolumeValue else volumePath, isHidden, volumeType)
             }
         }
     }
 
     // called when the user tries to create a volume in a non-writable directory
     private fun errorDirectoryNotWritable(volumePath: String) {
-        val dialog = CustomAlertDialogBuilder(requireContext(), themeValue)
+        val dialog = CustomAlertDialogBuilder(requireContext(), theme)
             .setTitle(R.string.error)
             .setPositiveButton(R.string.ok, null)
         @SuppressLint("InflateParams")
@@ -269,8 +392,17 @@ class SelectPathFragment: Fragment() {
         dialog.show()
     }
 
-    private fun addVolume(volumeName: String, isHidden: Boolean, volumeType: Byte) {
-        volumeDatabase.saveVolume(SavedVolume(volumeName, isHidden, volumeType))
-        (activity as AddVolumeActivity).onVolumeAdded(false)
+    private fun onExistingVolumeSelected(volumeName: String, isHidden: Boolean, volumeType: Byte) {
+        val volumeData = VolumeData(VolumeData.newUuid(), volumeName, isHidden, volumeType)
+        if (binding.switchRemember.isChecked) {
+            volumeDatabase.saveVolume(volumeData)
+        }
+        with (activity as AddVolumeActivity) {
+            if (volumeAction!! == Action.OPEN) {
+                openVolume(volumeData, binding.switchRemember.isChecked)
+            } else {
+                onVolumeAdded()
+            }
+        }
     }
 }

app/src/main/java/sushi/hardcore/droidfs/content_providers/ExternalProvider.kt

@@ -1,122 +0,0 @@
-package sushi.hardcore.droidfs.content_providers
-
-import android.content.Context
-import android.content.Intent
-import android.net.Uri
-import android.webkit.MimeTypeMap
-import androidx.appcompat.app.AppCompatActivity
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import sushi.hardcore.droidfs.LoadingTask
-import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.filesystems.EncryptedVolume
-import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
-import java.io.File
-
-object ExternalProvider {
-    private const val content_type_all = "*/*"
-    private var storedFiles = HashSet<Uri>()
-    private fun getContentType(filename: String, previous_content_type: String?): String {
-        if (content_type_all != previous_content_type) {
-            var contentType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(filename).extension)
-            if (contentType == null) {
-                contentType = content_type_all
-            }
-            if (previous_content_type == null) {
-                return contentType
-            } else if (previous_content_type != contentType) {
-                return content_type_all
-            }
-        }
-        return previous_content_type
-    }
-
-    private fun exportFile(context: Context, encryptedVolume: EncryptedVolume, file_path: String, previous_content_type: String?): Pair<Uri?, String?> {
-        val fileName = File(file_path).name
-        val tmpFileUri = RestrictedFileProvider.newFile(fileName)
-        if (tmpFileUri != null){
-            storedFiles.add(tmpFileUri)
-            if (encryptedVolume.exportFile(context, file_path, tmpFileUri)) {
-                return Pair(tmpFileUri, getContentType(fileName, previous_content_type))
-            }
-        }
-        return Pair(null, null)
-    }
-
-    fun share(activity: AppCompatActivity, themeValue: String, encryptedVolume: EncryptedVolume, file_paths: List<String>) {
-        var contentType: String? = null
-        val uris = ArrayList<Uri>(file_paths.size)
-        object : LoadingTask<String?>(activity, themeValue, R.string.loading_msg_export) {
-            override suspend fun doTask(): String? {
-                for (path in file_paths) {
-                    val result = exportFile(activity, encryptedVolume, path, contentType)
-                    contentType = if (result.first != null) {
-                        uris.add(result.first!!)
-                        result.second
-                    } else {
-                        return path
-                    }
-                }
-                return null
-            }
-        }.startTask(activity.lifecycleScope) { failedItem ->
-            if (failedItem == null) {
-                val shareIntent = Intent()
-                shareIntent.type = contentType
-                if (uris.size == 1) {
-                    shareIntent.action = Intent.ACTION_SEND
-                    shareIntent.putExtra(Intent.EXTRA_STREAM, uris[0])
-                } else {
-                    shareIntent.action = Intent.ACTION_SEND_MULTIPLE
-                    shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris)
-                }
-                activity.startActivity(Intent.createChooser(shareIntent, activity.getString(R.string.share_chooser)))
-            } else {
-                CustomAlertDialogBuilder(activity, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(activity.getString(R.string.export_failed, failedItem))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-            }
-        }
-    }
-
-    fun open(activity: AppCompatActivity, themeValue: String, encryptedVolume: EncryptedVolume, file_path: String) {
-        object : LoadingTask<Intent?>(activity, themeValue, R.string.loading_msg_export) {
-            override suspend fun doTask(): Intent? {
-                val result = exportFile(activity, encryptedVolume, file_path, null)
-                return if (result.first != null) {
-                    Intent(Intent.ACTION_VIEW).apply {
-                        setDataAndType(result.first, result.second)
-                    }
-                } else {
-                    null
-                }
-            }
-        }.startTask(activity.lifecycleScope) { openIntent ->
-            if (openIntent == null) {
-                CustomAlertDialogBuilder(activity, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(activity.getString(R.string.export_failed, file_path))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-            } else {
-                activity.startActivity(openIntent)
-            }
-        }
-    }
-
-    fun removeFilesAsync(context: Context) = GlobalScope.launch(Dispatchers.IO) {
-        val success = HashSet<Uri>(storedFiles.size)
-        for (uri in storedFiles) {
-            if (context.contentResolver.delete(uri, null, null) == 1) {
-                success.add(uri)
-            }
-        }
-        for (uri in success) {
-            storedFiles.remove(uri)
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/content_providers/RestrictedFileProvider.kt

@@ -1,194 +0,0 @@
-package sushi.hardcore.droidfs.content_providers
-
-import android.content.ContentProvider
-import android.content.ContentValues
-import android.content.Context
-import android.database.Cursor
-import android.database.MatrixCursor
-import android.database.sqlite.SQLiteDatabase
-import android.database.sqlite.SQLiteOpenHelper
-import android.net.Uri
-import android.os.ParcelFileDescriptor
-import android.provider.MediaStore
-import sushi.hardcore.droidfs.BuildConfig
-import sushi.hardcore.droidfs.util.SQLUtil.appendSelectionArgs
-import sushi.hardcore.droidfs.util.SQLUtil.concatenateWhere
-import sushi.hardcore.droidfs.util.Wiper
-import java.io.File
-import java.util.*
-import java.util.regex.Pattern
-
-class RestrictedFileProvider: ContentProvider() {
-    companion object {
-        private const val DB_NAME = "temporary_files.db"
-        private const val TABLE_FILES = "files"
-        private const val DB_VERSION = 3
-        private var dbHelper: RestrictedDatabaseHelper? = null
-        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".temporary_provider"
-        private val CONTENT_URI: Uri = Uri.parse("content://$AUTHORITY")
-        const val TEMPORARY_FILES_DIR_NAME = "temp"
-        private val UUID_PATTERN = Pattern.compile("[a-fA-F0-9-]+")
-
-        private lateinit var tempFilesDir: File
-
-        internal class TemporaryFileColumns {
-            companion object {
-                const val COLUMN_UUID = "uuid"
-                const val COLUMN_NAME = "name"
-            }
-        }
-
-        internal class RestrictedDatabaseHelper(context: Context?): SQLiteOpenHelper(context, DB_NAME, null, DB_VERSION) {
-            override fun onCreate(db: SQLiteDatabase) {
-                db.execSQL(
-                    "CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
-                            TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
-                            TemporaryFileColumns.COLUMN_NAME + " TEXT" +
-                            ");"
-                )
-            }
-
-            override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
-                if (oldVersion == 1) {
-                    db.execSQL("DROP TABLE IF EXISTS files")
-                    db.execSQL(
-                        "CREATE TABLE IF NOT EXISTS " + TABLE_FILES + " (" +
-                                TemporaryFileColumns.COLUMN_UUID + " TEXT PRIMARY KEY, " +
-                                TemporaryFileColumns.COLUMN_NAME + " TEXT" +
-                                ");"
-                    )
-                }
-            }
-        }
-
-        fun newFile(fileName: String): Uri? {
-            val uuid = UUID.randomUUID().toString()
-            val file = File(tempFilesDir, uuid)
-            return if (file.createNewFile()){
-                val contentValues = ContentValues()
-                contentValues.put(TemporaryFileColumns.COLUMN_UUID, uuid)
-                contentValues.put(TemporaryFileColumns.COLUMN_NAME, fileName)
-                if (dbHelper?.writableDatabase?.insert(TABLE_FILES, null, contentValues)?.toInt() != -1){
-                    Uri.withAppendedPath(CONTENT_URI, uuid)
-                } else {
-                    null
-                }
-            } else {
-                null
-            }
-        }
-
-        fun wipeAll(context: Context) {
-            tempFilesDir.listFiles()?.let{
-                for (file in it) {
-                    Wiper.wipe(file)
-                }
-            }
-            dbHelper?.close()
-            context.deleteDatabase(DB_NAME)
-        }
-
-        private fun isValidUUID(uuid: String): Boolean {
-            return UUID_PATTERN.matcher(uuid).matches()
-        }
-
-        private fun getUuidFromUri(uri: Uri): String? {
-            val uuid = uri.lastPathSegment
-            if (uuid != null) {
-                if (isValidUUID(uuid)) {
-                    return uuid
-                }
-            }
-            return null
-        }
-
-        private fun getFileFromUUID(uuid: String): File? {
-            if (isValidUUID(uuid)){
-                return File(tempFilesDir, uuid)
-            }
-            return null
-        }
-
-        private fun getFileFromUri(uri: Uri): File? {
-            getUuidFromUri(uri)?.let {
-                return getFileFromUUID(it)
-            }
-            return null
-        }
-    }
-
-    override fun onCreate(): Boolean {
-        context?.let {
-            dbHelper = RestrictedDatabaseHelper(it)
-            tempFilesDir = File(it.cacheDir, TEMPORARY_FILES_DIR_NAME)
-            return tempFilesDir.mkdirs()
-        }
-        return false
-    }
-
-    override fun insert(uri: Uri, values: ContentValues?): Uri? {
-        throw RuntimeException("Operation not supported")
-    }
-
-    override fun update(uri: Uri, values: ContentValues?, selection: String?, selectionArgs: Array<String>?): Int {
-        throw RuntimeException("Operation not supported")
-    }
-
-    override fun query(uri: Uri, projection: Array<String>?, selection: String?, selectionArgs: Array<String>?, sortOrder: String?): Cursor? {
-        var resultCursor: MatrixCursor? = null
-        val temporaryFile = getFileFromUri(uri)
-        temporaryFile?.let{
-            val fileName = dbHelper?.readableDatabase?.query(TABLE_FILES, arrayOf(TemporaryFileColumns.COLUMN_NAME), TemporaryFileColumns.COLUMN_UUID + "=?", arrayOf(uri.lastPathSegment), null, null, null)
-            fileName?.let{
-                if (fileName.moveToNext()) {
-                    resultCursor = MatrixCursor(
-                        arrayOf(
-                            MediaStore.MediaColumns.DISPLAY_NAME,
-                            MediaStore.MediaColumns.SIZE
-                        )
-                    )
-                    resultCursor!!.newRow()
-                        .add(fileName.getString(0))
-                        .add(temporaryFile.length())
-                }
-                fileName.close()
-            }
-        }
-        return resultCursor
-    }
-
-    override fun delete(uri: Uri, givenSelection: String?, givenSelectionArgs: Array<String>?): Int {
-        val uuid = getUuidFromUri(uri)
-        uuid?.let{
-            val selection = concatenateWhere(givenSelection ?: "" , TemporaryFileColumns.COLUMN_UUID + "=?")
-            val selectionArgs = appendSelectionArgs(givenSelectionArgs, arrayOf(it))
-
-            val files = dbHelper?.readableDatabase?.query(TABLE_FILES, arrayOf(TemporaryFileColumns.COLUMN_UUID), selection, selectionArgs, null, null, null)
-            if (files != null) {
-                while (files.moveToNext()) {
-                    getFileFromUUID(files.getString(0))?.let { file ->
-                        Wiper.wipe(file)
-                    }
-                }
-                files.close()
-                return dbHelper?.writableDatabase?.delete(TABLE_FILES, selection, selectionArgs) ?: 0
-            }
-        }
-        return 0
-    }
-
-    override fun getType(uri: Uri): String {
-        return "application/octet-stream"
-    }
-
-    override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {
-        if (("w" in mode && callingPackage == BuildConfig.APPLICATION_ID) || "w" !in mode) {
-            getFileFromUri(uri)?.let{
-                return ParcelFileDescriptor.open(it, ParcelFileDescriptor.parseMode(mode))
-            }
-        } else {
-            throw SecurityException("Read-only access")
-        }
-        return null
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/content_providers/TemporaryFileProvider.kt

@@ -0,0 +1,147 @@
+package sushi.hardcore.droidfs.content_providers
+
+import android.content.ContentProvider
+import android.content.ContentValues
+import android.content.Intent
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.net.Uri
+import android.os.ParcelFileDescriptor
+import android.provider.OpenableColumns
+import android.util.Log
+import android.webkit.MimeTypeMap
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.BuildConfig
+import sushi.hardcore.droidfs.EncryptedFileProvider
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
+import sushi.hardcore.droidfs.util.AndroidUtils
+import sushi.hardcore.droidfs.util.Wiper
+import java.io.File
+import java.util.UUID
+
+class TemporaryFileProvider : ContentProvider() {
+    private inner class ProvidedFile(
+        val file: EncryptedFileProvider.ExportedFile,
+        val size: Long,
+        val volumeId: Int
+    )
+
+    companion object {
+        private const val TAG = "TemporaryFileProvider"
+        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".temporary_provider"
+        private val BASE_URI: Uri = Uri.parse("content://$AUTHORITY")
+
+        lateinit var instance: TemporaryFileProvider
+            private set
+    }
+
+    private val usfSafWriteDelegate = AndroidUtils.LiveBooleanPreference("usf_saf_write", false)
+    private val usfSafWrite by usfSafWriteDelegate
+    private lateinit var volumeManager: VolumeManager
+    lateinit var encryptedFileProvider: EncryptedFileProvider
+    private val files = HashMap<Uri, ProvidedFile>()
+
+    override fun onCreate(): Boolean {
+        return context?.let {
+            volumeManager = (it.applicationContext as VolumeManagerApp).volumeManager
+            usfSafWriteDelegate.init(it)
+            encryptedFileProvider = EncryptedFileProvider(it)
+            instance = this
+            val tmpFilesDir = EncryptedFileProvider.getTmpFilesDir(it)
+            val success = tmpFilesDir.mkdirs()
+            // wipe any additional files not previously deleted
+            GlobalScope.launch(Dispatchers.IO) {
+                tmpFilesDir.listFiles()?.onEach { f -> Wiper.wipe(f) }
+            }
+            success
+        } ?: false
+    }
+
+    fun exportFile(
+        exportedFile: EncryptedFileProvider.ExportedFile,
+        size: Long,
+        volumeId: Int
+    ): Uri? {
+        if (!encryptedFileProvider.exportFile(exportedFile, volumeManager.getVolume(volumeId)!!)) {
+            return null
+        }
+        return Uri.withAppendedPath(BASE_URI, UUID.randomUUID().toString()).also {
+            files[it] = ProvidedFile(exportedFile, size, volumeId)
+        }
+    }
+
+    override fun query(
+        uri: Uri,
+        projection: Array<String>?,
+        selection: String?,
+        selectionArgs: Array<String>?,
+        sortOrder: String?
+    ): Cursor? {
+        val file = files[uri] ?: return null
+        return MatrixCursor(arrayOf(OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE), 1).apply {
+            addRow(arrayOf(File(file.file.path).name, file.size))
+        }
+    }
+
+    override fun insert(uri: Uri, values: ContentValues?): Uri? {
+        throw UnsupportedOperationException("Operation not supported")
+    }
+
+    override fun update(
+        uri: Uri,
+        values: ContentValues?,
+        selection: String?,
+        selectionArgs: Array<String>?
+    ): Int {
+        throw UnsupportedOperationException("Operation not supported")
+    }
+
+    override fun delete(uri: Uri, selection: String?, selectionArgs: Array<out String>?): Int {
+        return if (files.remove(uri)?.file?.also { it.free() } == null) 0 else 1
+    }
+
+    override fun getType(uri: Uri): String = files[uri]?.file?.path?.let {
+        MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(it).extension)
+    } ?: "application/octet-stream"
+
+    override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {
+        files[uri]?.let { file ->
+            val encryptedVolume = volumeManager.getVolume(file.volumeId) ?: run {
+                Log.e(TAG, "Volume closed for $uri")
+                return null
+            }
+            val result = encryptedFileProvider.openFile(
+                file.file,
+                mode,
+                encryptedVolume,
+                volumeManager.getCoroutineScope(file.volumeId),
+                false,
+                usfSafWrite,
+            )
+            when (result.second) {
+                EncryptedFileProvider.Error.SUCCESS -> return result.first!!
+                EncryptedFileProvider.Error.WRITE_ACCESS_DENIED -> Log.e(
+                    TAG,
+                    "Unauthorized write access requested from $callingPackage to $uri"
+                )
+
+                else -> result.second.log()
+            }
+        }
+        return null
+    }
+
+    // this must not be cancelled
+    fun wipe() = GlobalScope.launch(Dispatchers.IO) {
+        context!!.revokeUriPermission(BASE_URI, Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+        synchronized(this@TemporaryFileProvider) {
+            for (i in files.values) {
+                i.file.free()
+            }
+            files.clear()
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/content_providers/VolumeProvider.kt

@@ -0,0 +1,294 @@
+package sushi.hardcore.droidfs.content_providers
+
+import android.content.Context
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.os.CancellationSignal
+import android.os.ParcelFileDescriptor
+import android.provider.DocumentsContract
+import android.provider.DocumentsProvider
+import android.util.Log
+import android.webkit.MimeTypeMap
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.BuildConfig
+import sushi.hardcore.droidfs.EncryptedFileProvider
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeData
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.Stat
+import sushi.hardcore.droidfs.util.AndroidUtils
+import sushi.hardcore.droidfs.util.PathUtils
+import java.io.File
+
+class VolumeProvider: DocumentsProvider() {
+    companion object {
+        private const val TAG = "DocumentsProvider"
+        private const val AUTHORITY = BuildConfig.APPLICATION_ID + ".volume_provider"
+        private val DEFAULT_ROOT_PROJECTION = arrayOf(
+            DocumentsContract.Root.COLUMN_ROOT_ID,
+            DocumentsContract.Root.COLUMN_FLAGS,
+            DocumentsContract.Root.COLUMN_ICON,
+            DocumentsContract.Root.COLUMN_TITLE,
+            DocumentsContract.Root.COLUMN_DOCUMENT_ID,
+        )
+        private val DEFAULT_DOCUMENT_PROJECTION = arrayOf(
+            DocumentsContract.Document.COLUMN_DOCUMENT_ID,
+            DocumentsContract.Document.COLUMN_DISPLAY_NAME,
+            DocumentsContract.Document.COLUMN_MIME_TYPE,
+            DocumentsContract.Document.COLUMN_FLAGS,
+            DocumentsContract.Document.COLUMN_SIZE,
+            DocumentsContract.Document.COLUMN_LAST_MODIFIED,
+        )
+
+        fun notifyRootsChanged(context: Context) {
+            context.contentResolver.notifyChange(DocumentsContract.buildRootsUri(AUTHORITY), null)
+        }
+    }
+
+    private val usfExposeDelegate = AndroidUtils.LiveBooleanPreference("usf_expose", false)
+    private val usfExpose by usfExposeDelegate
+    private val usfSafWriteDelegate = AndroidUtils.LiveBooleanPreference("usf_saf_write", false)
+    private val usfSafWrite by usfSafWriteDelegate
+    private lateinit var volumeManager: VolumeManager
+    private val volumes = HashMap<String, Pair<Int, VolumeData>>()
+    private lateinit var encryptedFileProvider: EncryptedFileProvider
+
+    override fun onCreate(): Boolean {
+        val context = (context ?: return false)
+        AndroidUtils.LiveBooleanPreference.init(context, usfExposeDelegate, usfSafWriteDelegate)
+        volumeManager = (context.applicationContext as VolumeManagerApp).volumeManager
+        encryptedFileProvider = EncryptedFileProvider(context)
+        return true
+    }
+
+    override fun queryRoots(projection: Array<out String>?): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_ROOT_PROJECTION)
+        if (!usfExpose) return cursor
+        volumes.clear()
+        for (volume in volumeManager.listVolumes()) {
+            var flags = DocumentsContract.Root.FLAG_LOCAL_ONLY or DocumentsContract.Root.FLAG_SUPPORTS_IS_CHILD
+            if (usfSafWrite && volume.second.canWrite(context!!.filesDir.path)) {
+                flags = flags or DocumentsContract.Root.FLAG_SUPPORTS_CREATE
+            }
+            cursor.newRow().apply {
+                add(DocumentsContract.Root.COLUMN_ROOT_ID, volume.second.name)
+                add(DocumentsContract.Root.COLUMN_FLAGS, flags)
+                add(DocumentsContract.Root.COLUMN_ICON, R.drawable.icon_document_provider)
+                add(DocumentsContract.Root.COLUMN_TITLE, volume.second.name)
+                add(DocumentsContract.Root.COLUMN_DOCUMENT_ID, volume.second.uuid)
+            }
+            volumes[volume.second.uuid] = volume
+        }
+        return cursor
+    }
+
+    internal data class DocumentData(
+        val rootId: String,
+        val volumeId: Int,
+        val volumeData: VolumeData,
+        val encryptedVolume: EncryptedVolume,
+        val path: String
+    ) {
+        fun child(childPath: String) = DocumentData(rootId, volumeId, volumeData, encryptedVolume, childPath)
+    }
+
+    private fun parseDocumentId(documentId: String): DocumentData? {
+        val splits = documentId.split("/", limit = 2)
+        if (splits.size > 2) {
+            return null
+        } else {
+            volumes[splits[0]]?.let {
+                val encryptedVolume = volumeManager.getVolume(it.first) ?: return null
+                val path = "/"+if (splits.size == 2) {
+                    splits[1]
+                } else {
+                    ""
+                }
+                return DocumentData(splits[0], it.first, it.second, encryptedVolume, path)
+            }
+        }
+        return null
+    }
+
+    override fun isChildDocument(parentDocumentId: String, documentId: String): Boolean {
+        if (!usfExpose) return false
+        val parent = parseDocumentId(parentDocumentId) ?: return false
+        val child = parseDocumentId(documentId) ?: return false
+        return parent.rootId == child.rootId && PathUtils.isChildOf(child.path, parent.path)
+    }
+
+    private fun addDocumentRow(cursor: MatrixCursor, volumeData: VolumeData, documentId: String, name: String, stat: Stat) {
+        val isDirectory = stat.type == Stat.S_IFDIR
+        var flags = 0
+        if (usfSafWrite && volumeData.canWrite(context!!.filesDir.path)) {
+            flags = flags or DocumentsContract.Document.FLAG_SUPPORTS_DELETE or DocumentsContract.Document.FLAG_SUPPORTS_RENAME
+            if (isDirectory) {
+                flags = flags or DocumentsContract.Document.FLAG_DIR_SUPPORTS_CREATE
+            } else if (stat.type == Stat.S_IFREG) {
+                flags = flags or DocumentsContract.Document.FLAG_SUPPORTS_WRITE
+            }
+        }
+        val mimeType = if (isDirectory) {
+            DocumentsContract.Document.MIME_TYPE_DIR
+        } else {
+            MimeTypeMap.getSingleton().getMimeTypeFromExtension(File(name).extension)
+                ?: "application/octet-stream"
+        }
+        cursor.newRow().apply {
+            add(DocumentsContract.Document.COLUMN_DOCUMENT_ID, documentId)
+            add(DocumentsContract.Document.COLUMN_DISPLAY_NAME, name)
+            add(DocumentsContract.Document.COLUMN_MIME_TYPE, mimeType)
+            add(DocumentsContract.Document.COLUMN_FLAGS, flags)
+            add(DocumentsContract.Document.COLUMN_SIZE, stat.size)
+            add(DocumentsContract.Document.COLUMN_LAST_MODIFIED, stat.mTime)
+        }
+    }
+
+    override fun queryDocument(documentId: String, projection: Array<out String>?): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_DOCUMENT_PROJECTION)
+        if (!usfExpose) return cursor
+        val document = parseDocumentId(documentId) ?: return cursor
+        document.encryptedVolume.getAttr(document.path)?.let { stat ->
+            val name = if (document.path == "/") {
+                document.volumeData.shortName
+            } else {
+                File(document.path).name
+            }
+            addDocumentRow(cursor, document.volumeData, documentId, name, stat)
+        }
+        return cursor
+    }
+
+    override fun queryChildDocuments(
+        parentDocumentId: String,
+        projection: Array<out String>?,
+        sortOrder: String?
+    ): Cursor {
+        val cursor = MatrixCursor(projection ?: DEFAULT_DOCUMENT_PROJECTION)
+        if (!usfExpose) return cursor
+        val document = parseDocumentId(parentDocumentId) ?: return cursor
+        document.encryptedVolume.readDir(document.path)?.let { content ->
+            for (i in content) {
+                if (i.isParentFolder) continue
+                addDocumentRow(cursor, document.volumeData, document.rootId+i.fullPath, i.name, i.stat)
+            }
+        }
+        return cursor
+    }
+
+    class LazyExportedFile(
+        private val encryptedFileProvider: EncryptedFileProvider,
+        private val encryptedVolume: EncryptedVolume,
+        path: String,
+    ) : EncryptedFileProvider.ExportedFile(path) {
+
+        private val exportedFile: EncryptedFileProvider.ExportedFile by lazy {
+            val size = encryptedVolume.getAttr(path)?.size ?: run {
+                Log.e(TAG, "stat() failed")
+                throw RuntimeException("stat() failed")
+            }
+            val exportedFile = encryptedFileProvider.createFile(path, size) ?: run {
+                Log.e(TAG, "Can't create exported file")
+                throw RuntimeException("Can't create exported file")
+            }
+            if (!encryptedFileProvider.exportFile(exportedFile, encryptedVolume)) {
+                Log.e(TAG, "File export failed")
+                throw RuntimeException("File export failed")
+            }
+            exportedFile
+        }
+
+        override fun open(mode: Int, furtive: Boolean) = exportedFile.open(mode, furtive)
+        override fun free() = exportedFile.free()
+    }
+
+    override fun openDocument(
+        documentId: String,
+        mode: String,
+        signal: CancellationSignal?
+    ): ParcelFileDescriptor? {
+        if (!usfExpose) return null
+        val document = parseDocumentId(documentId) ?: return null
+
+        val lazyExportedFile = LazyExportedFile(encryptedFileProvider, document.encryptedVolume, document.path)
+
+        val result = encryptedFileProvider.openFile(
+            lazyExportedFile,
+            mode,
+            document.encryptedVolume,
+            volumeManager.getCoroutineScope(document.volumeId),
+            true,
+            usfSafWrite,
+        )
+        when (result.second) {
+            EncryptedFileProvider.Error.SUCCESS -> return result.first!!
+            EncryptedFileProvider.Error.WRITE_ACCESS_DENIED -> Log.e(TAG, "Unauthorized write access requested from $callingPackage")
+            else -> result.second.log()
+        }
+        return null
+    }
+
+    override fun createDocument(
+        parentDocumentId: String,
+        mimeType: String?,
+        displayName: String
+    ): String? {
+        if (!usfExpose || !usfSafWrite) return null
+        val document = parseDocumentId(parentDocumentId) ?: return null
+        val path = PathUtils.pathJoin(document.path, displayName)
+        var success = false
+        if (mimeType == DocumentsContract.Document.MIME_TYPE_DIR) {
+            success = document.encryptedVolume.mkdir(path)
+        } else {
+            val f = document.encryptedVolume.openFileWriteMode(path)
+            if (f != -1L) {
+                document.encryptedVolume.closeFile(f)
+                success = true
+            }
+        }
+        return if (success) {
+            document.rootId+path
+        } else {
+            null
+        }
+    }
+
+    override fun deleteDocument(documentId: String) {
+        if (!usfExpose || !usfSafWrite) return
+
+        fun recursiveRemoveDirectory(document: DocumentData) {
+            document.encryptedVolume.readDir(document.path)?.forEach { e ->
+                val childPath = PathUtils.pathJoin(document.path, e.name)
+                if (e.isDirectory) {
+                    recursiveRemoveDirectory(document.child(childPath))
+                } else  {
+                    document.encryptedVolume.deleteFile(childPath)
+                }
+                revokeDocumentPermission(document.rootId+childPath)
+            }
+            document.encryptedVolume.rmdir(document.path)
+        }
+
+        val document = parseDocumentId(documentId) ?: return
+        document.encryptedVolume.getAttr(document.path)?.let { stat ->
+            if (stat.type == Stat.S_IFDIR) {
+                recursiveRemoveDirectory(document)
+            } else {
+                document.encryptedVolume.deleteFile(document.path)
+            }
+        }
+    }
+
+    override fun renameDocument(documentId: String, displayName: String): String {
+        if (!usfExpose || !usfSafWrite) return documentId
+        val document = parseDocumentId(documentId) ?: return documentId
+        val newPath = PathUtils.pathJoin(PathUtils.getParentPath(document.path), displayName)
+        return if (document.encryptedVolume.rename(document.path, newPath)) {
+            document.rootId+newPath
+        } else {
+            documentId
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/explorers/BaseExplorerActivity.kt

@@ -1,19 +1,17 @@
 package sushi.hardcore.droidfs.explorers
 
-import android.content.ComponentName
-import android.content.Context
 import android.content.Intent
-import android.content.ServiceConnection
 import android.net.Uri
 import android.os.Bundle
-import android.os.IBinder
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import android.widget.ImageButton
+import android.widget.ProgressBar
 import android.widget.TextView
 import android.widget.Toast
-import androidx.core.content.ContextCompat
+import androidx.activity.addCallback
+import androidx.core.view.isVisible
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.lifecycleScope
@@ -22,26 +20,36 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.cancelAndJoin
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
 import sushi.hardcore.droidfs.BaseActivity
-import sushi.hardcore.droidfs.ConstValues
-import sushi.hardcore.droidfs.ConstValues.isAudio
-import sushi.hardcore.droidfs.ConstValues.isImage
-import sushi.hardcore.droidfs.ConstValues.isPDF
-import sushi.hardcore.droidfs.ConstValues.isText
-import sushi.hardcore.droidfs.ConstValues.isVideo
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.EncryptedFileProvider
+import sushi.hardcore.droidfs.FileShare
+import sushi.hardcore.droidfs.FileTypes
+import sushi.hardcore.droidfs.LoadingTask
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.adapters.ExplorerElementAdapter
 import sushi.hardcore.droidfs.adapters.OpenAsDialogAdapter
-import sushi.hardcore.droidfs.content_providers.ExternalProvider
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
+import sushi.hardcore.droidfs.content_providers.TemporaryFileProvider
 import sushi.hardcore.droidfs.file_operations.FileOperationService
 import sushi.hardcore.droidfs.file_operations.OperationFile
-import sushi.hardcore.droidfs.file_viewers.*
+import sushi.hardcore.droidfs.file_operations.TaskResult
+import sushi.hardcore.droidfs.file_viewers.AudioPlayer
+import sushi.hardcore.droidfs.file_viewers.ImageViewer
+import sushi.hardcore.droidfs.file_viewers.PdfViewer
+import sushi.hardcore.droidfs.file_viewers.TextEditor
+import sushi.hardcore.droidfs.file_viewers.VideoPlayer
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.UIUtils
+import sushi.hardcore.droidfs.util.finishOnClose
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
 
@@ -51,6 +59,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     private var foldersFirst = true
     private var mapFolders = true
     private var currentSortOrderIndex = 0
+    protected var volumeId = -1
     protected lateinit var encryptedVolume: EncryptedVolume
     private lateinit var volumeName: String
     private lateinit var explorerViewModel: ExplorerViewModel
@@ -60,38 +69,42 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             explorerViewModel.currentDirectoryPath = value
         }
     protected lateinit var fileOperationService: FileOperationService
+    protected val activityScope = MainScope()
+    private var directoryLoadingTask: Job? = null
     protected lateinit var explorerElements: MutableList<ExplorerElement>
     protected lateinit var explorerAdapter: ExplorerElementAdapter
-    private var isCreating = true
-    protected var isStartingActivity = false
+    protected lateinit var app: VolumeManagerApp
     private var usf_open = false
-    protected var usf_keep_open = false
     private lateinit var linearLayoutManager: LinearLayoutManager
     private var isUsingListLayout = true
     private lateinit var layoutIcon: ImageButton
     private lateinit var titleText: TextView
     private lateinit var recycler_view_explorer: RecyclerView
     private lateinit var refresher: SwipeRefreshLayout
+    private lateinit var loader: ProgressBar
     private lateinit var textDirEmpty: TextView
     private lateinit var currentPathText: TextView
     private lateinit var numberOfFilesText: TextView
     private lateinit var numberOfFoldersText: TextView
     private lateinit var totalSizeText: TextView
+    protected val fileShare by lazy { FileShare(this) }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        app = application as VolumeManagerApp
         usf_open = sharedPrefs.getBoolean("usf_open", false)
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
-        volumeName = intent.getStringExtra("volume_name") ?: ""
-        encryptedVolume = intent.getParcelableExtra("volume")!!
+        volumeName = intent.getStringExtra("volumeName") ?: ""
+        volumeId = intent.getIntExtra("volumeId", -1)
+        encryptedVolume = app.volumeManager.getVolume(volumeId)!!.also { finishOnClose(it) }
         sortOrderEntries = resources.getStringArray(R.array.sort_orders_entries)
         sortOrderValues = resources.getStringArray(R.array.sort_orders_values)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         mapFolders = sharedPrefs.getBoolean("map_folders", true)
-        currentSortOrderIndex = resources.getStringArray(R.array.sort_orders_values).indexOf(sharedPrefs.getString(ConstValues.SORT_ORDER_KEY, "name"))
+        currentSortOrderIndex = resources.getStringArray(R.array.sort_orders_values).indexOf(sharedPrefs.getString(Constants.SORT_ORDER_KEY, "name"))
         init()
         recycler_view_explorer = findViewById(R.id.recycler_view_explorer)
         refresher = findViewById(R.id.refresher)
+        loader = findViewById(R.id.loader)
         textDirEmpty = findViewById(R.id.text_dir_empty)
         currentPathText = findViewById(R.id.current_path_text)
         numberOfFilesText = findViewById(R.id.number_of_files_text)
@@ -112,16 +125,28 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 null
             },
             this,
-            sharedPrefs.getLong(ConstValues.THUMBNAIL_MAX_SIZE_KEY, ConstValues.DEFAULT_THUMBNAIL_MAX_SIZE)*1000,
+            sharedPrefs.getLong(Constants.THUMBNAIL_MAX_SIZE_KEY, Constants.DEFAULT_THUMBNAIL_MAX_SIZE)*1000,
         )
         explorerViewModel = ViewModelProvider(this).get(ExplorerViewModel::class.java)
         currentDirectoryPath = explorerViewModel.currentDirectoryPath
-        setCurrentPath(currentDirectoryPath)
         linearLayoutManager = LinearLayoutManager(this@BaseExplorerActivity)
         recycler_view_explorer.adapter = explorerAdapter
         isUsingListLayout = sharedPrefs.getBoolean("useListLayout", true)
         layoutIcon = findViewById(R.id.layout_icon)
         setRecyclerViewLayout()
+        onBackPressedDispatcher.addCallback(this) {
+            if (explorerAdapter.selectedItems.isEmpty()) {
+                val parentPath = PathUtils.getParentPath(currentDirectoryPath)
+                if (parentPath == currentDirectoryPath) {
+                    isEnabled = false
+                    onBackPressedDispatcher.onBackPressed()
+                } else {
+                    setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
+                }
+            } else {
+                unselectAll()
+            }
+        }
         layoutIcon.setOnClickListener {
             isUsingListLayout = !isUsingListLayout
             setRecyclerViewLayout()
@@ -157,42 +182,63 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     }
 
     protected open fun init() {
-        setContentView(R.layout.activity_explorer_base)
+        setContentView(R.layout.activity_explorer)
     }
 
-    protected open fun bindFileOperationService(){
-        Intent(this, FileOperationService::class.java).also {
-            bindService(it, object : ServiceConnection {
-                override fun onServiceConnected(className: ComponentName, service: IBinder) {
-                    val binder = service as FileOperationService.LocalBinder
-                    fileOperationService = binder.getService()
-                    binder.setEncryptedVolume(encryptedVolume)
-                }
-                override fun onServiceDisconnected(arg0: ComponentName) {
-
-                }
-            }, Context.BIND_AUTO_CREATE)
+    protected open fun bindFileOperationService() {
+        FileOperationService.bind(this) {
+            fileOperationService = it
         }
     }
 
-    private fun startFileViewer(cls: Class<*>, filePath: String){
+    private fun startFileViewer(cls: Class<*>, filePath: String) {
         val intent = Intent(this, cls).apply {
             putExtra("path", filePath)
-            putExtra("volume", encryptedVolume)
+            putExtra("volumeId", volumeId)
             putExtra("sortOrder", sortOrderValues[currentSortOrderIndex])
         }
-        isStartingActivity = true
         startActivity(intent)
     }
 
-    private fun openWithExternalApp(fullPath: String){
-        isStartingActivity = true
-        ExternalProvider.open(this, themeValue, encryptedVolume, fullPath)
+    protected fun onExportFailed(errorResId: Int) {
+        CustomAlertDialogBuilder(this, theme)
+            .setTitle(R.string.error)
+            .setMessage(getString(R.string.tmp_export_failed, getString(errorResId)))
+            .setPositiveButton(R.string.ok, null)
+            .show()
     }
 
-    private fun showOpenAsDialog(path: String) {
+    private fun openWithExternalApp(path: String, size: Long) {
+        app.isExporting = true
+        val exportedFile = TemporaryFileProvider.instance.encryptedFileProvider.createFile(path, size)
+        if (exportedFile == null) {
+            onExportFailed(R.string.export_failed_create)
+            return
+        }
+        val msg = when (exportedFile) {
+            is EncryptedFileProvider.ExportedMemFile -> R.string.export_mem
+            is EncryptedFileProvider.ExportedDiskFile -> R.string.export_disk
+            else -> R.string.loading_msg_export
+        }
+        object : LoadingTask<Pair<Intent?, Int?>>(this, theme, msg) {
+            override suspend fun doTask(): Pair<Intent?, Int?> {
+                return fileShare.openWith(exportedFile, size, volumeId)
+            }
+        }.startTask(lifecycleScope) { (intent, error) ->
+            if (intent == null) {
+                onExportFailed(error!!)
+            } else {
+                app.isStartingExternalApp = true
+                startActivity(intent)
+            }
+            app.isExporting = false
+        }
+    }
+
+    private fun showOpenAsDialog(explorerElement: ExplorerElement) {
+        val path = explorerElement.fullPath
         val adapter = OpenAsDialogAdapter(this, usf_open)
-        CustomAlertDialogBuilder(this, themeValue)
+        CustomAlertDialogBuilder(this, theme)
             .setSingleChoiceItems(adapter, -1) { dialog, which ->
                 when (adapter.getItem(which)) {
                     "image" -> startFileViewer(ImageViewer::class.java, path)
@@ -201,7 +247,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                     "pdf" -> startFileViewer(PdfViewer::class.java, path)
                     "text" -> startFileViewer(TextEditor::class.java, path)
                     "external" -> if (usf_open) {
-                        openWithExternalApp(path)
+                        openWithExternalApp(path, explorerElement.stat.size)
                     }
                 }
                 dialog.dismiss()
@@ -211,6 +257,27 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             .show()
     }
 
+    protected fun createNewFile(callback: (Long) -> Unit) {
+        EditTextDialog(this, R.string.enter_file_name) {
+            if (it.isEmpty()) {
+                Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
+                createNewFile(callback)
+            } else {
+                val filePath = PathUtils.pathJoin(currentDirectoryPath, it)
+                val handleID = encryptedVolume.openFileWriteMode(filePath)
+                if (handleID == -1L) {
+                    CustomAlertDialogBuilder(this, theme)
+                        .setTitle(R.string.error)
+                        .setMessage(R.string.file_creation_failed)
+                        .setPositiveButton(R.string.ok, null)
+                        .show()
+                } else {
+                    callback(handleID)
+                }
+            }
+        }.show()
+    }
+
     private fun setVolumeNameTitle() {
         titleText.text = getString(R.string.volume, volumeName)
     }
@@ -233,22 +300,22 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 explorerElements[position].isParentFolder -> {
                     setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
                 }
-                isImage(fullPath) -> {
+                FileTypes.isImage(fullPath) -> {
                     startFileViewer(ImageViewer::class.java, fullPath)
                 }
-                isVideo(fullPath) -> {
+                FileTypes.isVideo(fullPath) -> {
                     startFileViewer(VideoPlayer::class.java, fullPath)
                 }
-                isText(fullPath) -> {
+                FileTypes.isText(fullPath) -> {
                     startFileViewer(TextEditor::class.java, fullPath)
                 }
-                isPDF(fullPath) -> {
+                FileTypes.isPDF(fullPath) -> {
                     startFileViewer(PdfViewer::class.java, fullPath)
                 }
-                isAudio(fullPath) -> {
+                FileTypes.isAudio(fullPath) -> {
                     startFileViewer(AudioPlayer::class.java, fullPath)
                 }
-                else -> showOpenAsDialog(fullPath)
+                else -> showOpenAsDialog(explorerElements[position])
             }
         }
         invalidateOptionsMenu()
@@ -263,19 +330,16 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         invalidateOptionsMenu()
     }
 
-    private fun displayExplorerElements(totalSize: Long) {
-        totalSizeText.text = getString(R.string.total_size, PathUtils.formatSize(totalSize))
-        synchronized(this) {
-            ExplorerElement.sortBy(sortOrderValues[currentSortOrderIndex], foldersFirst, explorerElements)
-        }
+    private fun displayExplorerElements() {
+        ExplorerElement.sortBy(sortOrderValues[currentSortOrderIndex], foldersFirst, explorerElements)
         unselectAll(false)
+        loader.isVisible = false
+        recycler_view_explorer.isVisible = true
         explorerAdapter.explorerElements = explorerElements
-        val sharedPrefsEditor = sharedPrefs.edit()
-        sharedPrefsEditor.putString(ConstValues.SORT_ORDER_KEY, sortOrderValues[currentSortOrderIndex])
-        sharedPrefsEditor.apply()
     }
 
-    private fun recursiveSetSize(directory: ExplorerElement) {
+    private suspend fun recursiveSetSize(directory: ExplorerElement) {
+        yield()
         for (child in encryptedVolume.readDir(directory.fullPath) ?: return) {
             if (child.isDirectory) {
                 recursiveSetSize(child)
@@ -299,15 +363,16 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    protected fun setCurrentPath(path: String, onDisplayed: (() -> Unit)? = null) {
-        synchronized(this) {
-            explorerElements = encryptedVolume.readDir(path) ?: return
-            if (path != "/") {
-                explorerElements.add(
-                    0,
-                    ExplorerElement("..", Stat.parentFolderStat(), parentPath = currentDirectoryPath)
-                )
-            }
+    protected fun setCurrentPath(path: String, onDisplayed: (() -> Unit)? = null) = lifecycleScope.launch {
+        directoryLoadingTask?.cancelAndJoin()
+        recycler_view_explorer.isVisible = false
+        loader.isVisible = true
+        explorerElements = encryptedVolume.readDir(path) ?: return@launch
+        if (path != "/") {
+            explorerElements.add(
+                0,
+                ExplorerElement("..", Stat.parentFolderStat(), parentPath = currentDirectoryPath)
+            )
         }
         textDirEmpty.visibility = if (explorerElements.size == 0) View.VISIBLE else View.GONE
         currentDirectoryPath = path
@@ -315,55 +380,47 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         displayNumberOfElements(numberOfFilesText, R.string.one_file, R.string.multiple_files, explorerElements.count { it.isRegularFile })
         displayNumberOfElements(numberOfFoldersText, R.string.one_folder, R.string.multiple_folders, explorerElements.count { it.isDirectory })
         if (mapFolders) {
-            lifecycleScope.launch {
-                var totalSize: Long = 0
-                withContext(Dispatchers.IO) {
-                    synchronized(this@BaseExplorerActivity) {
-                        for (element in explorerElements) {
-                            if (element.isDirectory) {
-                                recursiveSetSize(element)
-                            }
-                            totalSize += element.stat.size
-                        }
+            var totalSize: Long = 0
+            directoryLoadingTask = launch(Dispatchers.IO) {
+                for (element in explorerElements) {
+                    if (element.isDirectory) {
+                        recursiveSetSize(element)
                     }
+                    totalSize += element.stat.size
                 }
-                displayExplorerElements(totalSize)
-                onDisplayed?.invoke()
             }
+            directoryLoadingTask!!.join()
+            displayExplorerElements()
+            totalSizeText.text = getString(R.string.total_size, PathUtils.formatSize(totalSize))
+            onDisplayed?.invoke()
         } else {
-            displayExplorerElements(explorerElements.filter { !it.isParentFolder }.sumOf { it.stat.size })
+            displayExplorerElements()
+            totalSizeText.text = getString(
+                R.string.total_size,
+                PathUtils.formatSize(explorerElements.filter { !it.isParentFolder }.sumOf { it.stat.size })
+            )
             onDisplayed?.invoke()
         }
     }
 
-    private fun askCloseVolume() {
-        CustomAlertDialogBuilder(this, themeValue)
+    private fun askLockVolume() {
+        CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
-                .setMessage(R.string.ask_close_volume)
-                .setPositiveButton(R.string.ok) { _, _ -> closeVolumeOnUserExit() }
+                .setMessage(R.string.ask_lock_volume)
+                .setPositiveButton(R.string.ok) { _, _ ->
+                    app.volumeManager.closeVolume(volumeId)
+                    finish()
+                }
                 .setNegativeButton(R.string.cancel, null)
                 .show()
     }
 
-    override fun onBackPressed() {
-        if (explorerAdapter.selectedItems.isEmpty()) {
-            val parentPath = PathUtils.getParentPath(currentDirectoryPath)
-            if (parentPath == currentDirectoryPath) {
-                askCloseVolume()
-            } else {
-                setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
-            }
-        } else {
-            unselectAll()
-        }
-    }
-
     private fun createFolder(folderName: String){
         if (folderName.isEmpty()) {
             Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
         } else {
             if (!encryptedVolume.mkdir(PathUtils.pathJoin(currentDirectoryPath, folderName))) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(R.string.error_mkdir)
                         .setPositiveButton(R.string.ok, null)
@@ -381,10 +438,10 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }.show()
     }
 
-    protected fun checkPathOverwrite(items: ArrayList<OperationFile>, dstDirectoryPath: String, callback: (ArrayList<OperationFile>?) -> Unit) {
+    protected fun checkPathOverwrite(items: List<OperationFile>, dstDirectoryPath: String, callback: (List<OperationFile>?) -> Unit) {
         val srcDirectoryPath = items[0].parentPath
         var ready = true
-        for (i in 0 until items.size) {
+        for (i in items.indices) {
             val testDstPath: String
             if (items[i].dstPath == null){
                 testDstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].srcPath))
@@ -400,7 +457,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 }
             }
             if (!ready){
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.warning)
                     .setMessage(getString(
                         if (items[i].isDirectory) {
@@ -418,7 +475,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                         with(EditTextDialog(this, R.string.enter_new_name) {
                             items[i].dstPath = PathUtils.pathJoin(dstDirectoryPath, PathUtils.getRelativePath(srcDirectoryPath, items[i].parentPath), it)
                             if (items[i].isDirectory) {
-                                for (j in 0 until items.size){
+                                for (j in items.indices) {
                                     if (PathUtils.isChildOf(items[j].srcPath, items[i].srcPath)) {
                                         items[j].dstPath = PathUtils.pathJoin(items[i].dstPath!!, PathUtils.getRelativePath(items[i].srcPath, items[j].srcPath))
                                     }
@@ -445,12 +502,38 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    protected fun importFilesFromUris(uris: List<Uri>, callback: (String?) -> Unit) {
+    protected fun onTaskResult(
+        result: TaskResult<out String?>,
+        failedErrorMessage: Int,
+        successMessage: Int = -1,
+        onSuccess: (() -> Unit)? = null,
+    ) {
+        when (result.state) {
+            TaskResult.State.SUCCESS -> {
+                if (onSuccess == null) {
+                    Toast.makeText(this, successMessage, Toast.LENGTH_SHORT).show()
+                } else {
+                    onSuccess()
+                }
+            }
+            TaskResult.State.FAILED -> {
+                CustomAlertDialogBuilder(this, theme)
+                    .setTitle(R.string.error)
+                    .setMessage(getString(failedErrorMessage, result.failedItem))
+                    .setPositiveButton(R.string.ok, null)
+                    .show()
+            }
+            TaskResult.State.ERROR -> result.showErrorAlertDialog(this, theme)
+            TaskResult.State.CANCELLED -> {}
+        }
+    }
+
+    protected fun importFilesFromUris(uris: List<Uri>, callback: () -> Unit) {
         val items = ArrayList<OperationFile>()
         for (uri in uris) {
             val fileName = PathUtils.getFilenameFromURI(this, uri)
             if (fileName == null) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.error_retrieving_filename, uri))
                         .setPositiveButton(R.string.ok, null)
@@ -464,13 +547,10 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         if (items.size > 0) {
             checkPathOverwrite(items, currentDirectoryPath) { checkedItems ->
                 checkedItems?.let {
-                    lifecycleScope.launch {
-                        val taskResult = fileOperationService.importFilesFromUris(checkedItems.map { it.dstPath!! }, uris)
-                        if (taskResult.cancelled) {
-                            setCurrentPath(currentDirectoryPath)
-                        } else {
-                            callback(taskResult.failedItem)
-                        }
+                    activityScope.launch {
+                        val result = fileOperationService.importFilesFromUris(volumeId, checkedItems.map { it.dstPath!! }, uris)
+                        onTaskResult(result, R.string.import_failed, onSuccess = callback)
+                        setCurrentPath(currentDirectoryPath)
                     }
                 }
             }
@@ -482,7 +562,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
         } else {
             if (!encryptedVolume.rename(PathUtils.pathJoin(currentDirectoryPath, old_name), PathUtils.pathJoin(currentDirectoryPath, new_name))) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.rename_failed, old_name))
                         .setPositiveButton(R.string.ok, null)
@@ -495,14 +575,6 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    private fun setMenuIconTint(menu: Menu, iconColor: Int, menuItemId: Int, drawableId: Int) {
-        menu.findItem(menuItemId)?.let {
-            it.icon = ContextCompat.getDrawable(this, drawableId)?.apply {
-                setTint(iconColor)
-            }
-        }
-    }
-
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menu.findItem(R.id.rename).isVisible = false
         menu.findItem(R.id.open_as)?.isVisible = false
@@ -510,11 +582,12 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             menu.findItem(R.id.external_open)?.isVisible = false
         }
         val noItemSelected = explorerAdapter.selectedItems.isEmpty()
-        val iconColor = ContextCompat.getColor(this, R.color.neutralIconTint)
-        setMenuIconTint(menu, iconColor, R.id.sort, R.drawable.icon_sort)
-        setMenuIconTint(menu, iconColor, R.id.decrypt, R.drawable.icon_decrypt)
-        setMenuIconTint(menu, iconColor, R.id.share, R.drawable.icon_share)
+        with(UIUtils.getMenuIconNeutralTint(this, menu)) {
+            applyTo(R.id.sort, R.drawable.icon_sort)
+            applyTo(R.id.share, R.drawable.icon_share)
+        }
         menu.findItem(R.id.sort).isVisible = noItemSelected
+        menu.findItem(R.id.lock).isVisible = noItemSelected
         menu.findItem(R.id.close).isVisible = noItemSelected
         supportActionBar?.setDisplayHomeAsUpEnabled(!noItemSelected)
         if (!noItemSelected) {
@@ -538,11 +611,17 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 true
             }
             R.id.sort -> {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                         .setTitle(R.string.sort_order)
                         .setSingleChoiceItems(sortOrderEntries, currentSortOrderIndex) { dialog, which ->
                             currentSortOrderIndex = which
-                            setCurrentPath(currentDirectoryPath)
+                            // displayExplorerElements must not be called if directoryLoadingTask is active
+                            if (directoryLoadingTask?.isActive != true) {
+                                displayExplorerElements()
+                            }
+                            val sharedPrefsEditor = sharedPrefs.edit()
+                            sharedPrefsEditor.putString(Constants.SORT_ORDER_KEY, sortOrderValues[currentSortOrderIndex])
+                            sharedPrefsEditor.apply()
                             dialog.dismiss()
                         }
                         .setNegativeButton(R.string.cancel, null)
@@ -560,75 +639,41 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 true
             }
             R.id.open_as -> {
-                showOpenAsDialog(
-                    PathUtils.pathJoin(
-                        currentDirectoryPath,
-                        explorerElements[explorerAdapter.selectedItems.first()].name
-                    )
-                )
+                showOpenAsDialog(explorerElements[explorerAdapter.selectedItems.first()])
                 true
             }
             R.id.external_open -> {
                 if (usf_open){
-                    openWithExternalApp(
-                        PathUtils.pathJoin(
-                            currentDirectoryPath,
-                            explorerElements[explorerAdapter.selectedItems.first()].name
-                        )
-                    )
+                    val explorerElement = explorerElements[explorerAdapter.selectedItems.first()]
+                    openWithExternalApp(explorerElement.fullPath, explorerElement.stat.size)
                     unselectAll()
                 }
                 true
             }
             R.id.close -> {
-                askCloseVolume()
+                finish()
+                true
+            }
+            R.id.lock -> {
+                askLockVolume()
                 true
             }
             else -> super.onOptionsItemSelected(item)
         }
     }
 
-    protected open fun closeVolumeOnUserExit() {
-        finish()
-    }
-
-    protected open fun closeVolumeOnDestroy() {
-        if (!encryptedVolume.isClosed()) {
-            encryptedVolume.close()
-        }
-        RestrictedFileProvider.wipeAll(this) //additional security
-    }
-
     override fun onDestroy() {
         super.onDestroy()
         if (!isChangingConfigurations) { //activity won't be recreated
-            closeVolumeOnDestroy()
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!isChangingConfigurations){
-            if (isStartingActivity){
-                isStartingActivity = false
-            } else if (!usf_keep_open){
-                finish()
-            }
+            activityScope.cancel()
         }
     }
 
     override fun onResume() {
         super.onResume()
-        if (isCreating){
-            isCreating = false
-        } else {
-            if (encryptedVolume.isClosed()) {
-                finish()
-            } else {
-                isStartingActivity = false
-                ExternalProvider.removeFilesAsync(this)
-                setCurrentPath(currentDirectoryPath)
-            }
+        if (app.isStartingExternalApp) {
+            TemporaryFileProvider.instance.wipe()
         }
+        setCurrentPath(currentDirectoryPath)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivity.kt

@@ -6,18 +6,18 @@ import android.net.Uri
 import android.view.Menu
 import android.view.MenuItem
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.documentfile.provider.DocumentFile
 import androidx.lifecycle.lifecycleScope
+import com.google.android.material.floatingactionbutton.FloatingActionButton
 import kotlinx.coroutines.launch
 import sushi.hardcore.droidfs.CameraActivity
+import sushi.hardcore.droidfs.LoadingTask
 import sushi.hardcore.droidfs.MainActivity
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.adapters.IconTextDialogAdapter
-import sushi.hardcore.droidfs.content_providers.ExternalProvider
-import sushi.hardcore.droidfs.databinding.ActivityExplorerBinding
 import sushi.hardcore.droidfs.file_operations.OperationFile
-import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.Stat
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
@@ -32,177 +32,171 @@ class ExplorerActivity : BaseExplorerActivity() {
     private var usf_share = false
     private var currentItemAction = ItemsActions.NONE
     private val itemsToProcess = ArrayList<OperationFile>()
-    private lateinit var binding: ActivityExplorerBinding
     private val pickFromOtherVolumes = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
         if (result.resultCode == Activity.RESULT_OK) {
             result.data?.let { resultIntent ->
-                val remoteEncryptedVolume = resultIntent.getParcelableExtra<EncryptedVolume>("volume")!!
+                val srcVolumeId = resultIntent.getIntExtra("volumeId", -1)
+                val srcEncryptedVolume = app.volumeManager.getVolume(srcVolumeId)!!
                 val path = resultIntent.getStringExtra("path")
-                val operationFiles = ArrayList<OperationFile>()
                 if (path == null){ //multiples elements
                     val paths = resultIntent.getStringArrayListExtra("paths")
                     val types = resultIntent.getIntegerArrayListExtra("types")
                     if (types != null && paths != null){
-                        for (i in paths.indices) {
-                            operationFiles.add(
-                                OperationFile(paths[i], types[i])
-                            )
-                            if (types[i] == Stat.S_IFDIR) {
-                                remoteEncryptedVolume.recursiveMapFiles(paths[i])?.forEach {
-                                    operationFiles.add(OperationFile.fromExplorerElement(it))
+                        object : LoadingTask<List<OperationFile>>(this, theme, R.string.discovering_files) {
+                            override suspend fun doTask(): List<OperationFile> {
+                                val operationFiles = ArrayList<OperationFile>()
+                                for (i in paths.indices) {
+                                    operationFiles.add(OperationFile(paths[i], types[i]))
+                                    if (types[i] == Stat.S_IFDIR) {
+                                        srcEncryptedVolume.recursiveMapFiles(paths[i])?.forEach {
+                                            operationFiles.add(OperationFile.fromExplorerElement(it))
+                                        }
+                                    }
                                 }
+                                return operationFiles
                             }
+                        }.startTask(lifecycleScope) { operationFiles ->
+                            importFilesFromVolume(srcVolumeId, operationFiles)
                         }
                     }
                 } else {
-                    operationFiles.add(
-                        OperationFile(path, Stat.S_IFREG)
-                    )
-                }
-                if (operationFiles.size > 0){
-                    checkPathOverwrite(operationFiles, currentDirectoryPath) { items ->
-                        if (items == null) {
-                            remoteEncryptedVolume.close()
-                        } else {
-                            lifecycleScope.launch {
-                                val failedItem = fileOperationService.copyElements(items, remoteEncryptedVolume)
-                                if (failedItem == null) {
-                                    Toast.makeText(this@ExplorerActivity, R.string.success_import, Toast.LENGTH_SHORT).show()
-                                } else {
-                                    CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                                        .setTitle(R.string.error)
-                                        .setMessage(getString(R.string.import_failed, failedItem))
-                                        .setPositiveButton(R.string.ok, null)
-                                        .show()
-                                }
-                                setCurrentPath(currentDirectoryPath)
-                                remoteEncryptedVolume.close()
-                            }
-                        }
-                    }
-                } else {
-                    remoteEncryptedVolume.close()
+                    importFilesFromVolume(srcVolumeId, arrayListOf(OperationFile(path, Stat.S_IFREG)))
                 }
             }
         }
     }
     private val pickFiles = registerForActivityResult(ActivityResultContracts.OpenMultipleDocuments()) { uris ->
         if (uris != null) {
-            importFilesFromUris(uris){ failedItem ->
-                onImportComplete(failedItem, uris)
+            for (uri in uris) {
+                try {
+                    contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+                } catch (e: SecurityException) {
+                    e.printStackTrace()
+                }
+            }
+            importFilesFromUris(uris) {
+                onImportComplete(uris)
             }
         }
     }
     private val pickExportDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { uri ->
         if (uri != null) {
-            lifecycleScope.launch {
-                val result = fileOperationService.exportFiles(uri, explorerAdapter.selectedItems.map { i -> explorerElements[i] })
-                if (!result.cancelled) {
-                    if (result.failedItem == null) {
-                        Toast.makeText(this@ExplorerActivity, R.string.success_export, Toast.LENGTH_SHORT).show()
-                    } else {
-                        CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                            .setTitle(R.string.error)
-                            .setMessage(getString(R.string.export_failed, result.failedItem))
-                            .setPositiveButton(R.string.ok, null)
-                            .show()
-                    }
-                }
+            contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+            val items = explorerAdapter.selectedItems.map { i -> explorerElements[i] }
+            activityScope.launch {
+                val result = fileOperationService.exportFiles(volumeId, items, uri)
+                onTaskResult(result, R.string.export_failed, R.string.success_export)
             }
         }
         unselectAll()
     }
     private val pickImportDirectory = registerForActivityResult(ActivityResultContracts.OpenDocumentTree()) { rootUri ->
         rootUri?.let {
+            contentResolver.takePersistableUriPermission(it, Intent.FLAG_GRANT_READ_URI_PERMISSION)
             val tree = DocumentFile.fromTreeUri(this, it)!! //non-null after Lollipop
             val operation = OperationFile(PathUtils.pathJoin(currentDirectoryPath, tree.name!!), Stat.S_IFDIR)
             checkPathOverwrite(arrayListOf(operation), currentDirectoryPath) { checkedOperation ->
                 checkedOperation?.let {
-                    lifecycleScope.launch {
-                        val result = fileOperationService.importDirectory(checkedOperation[0].dstPath!!, tree)
-                        if (result.taskResult.cancelled) {
-                            setCurrentPath(currentDirectoryPath)
-                        } else {
-                            onImportComplete(result.taskResult.failedItem, result.uris, tree)
+                    activityScope.launch {
+                        val result = fileOperationService.importDirectory(volumeId, checkedOperation[0].dstPath!!, tree)
+                        onTaskResult(result.taskResult, R.string.import_failed) {
+                            onImportComplete(result.uris, tree)
                         }
+                        setCurrentPath(currentDirectoryPath)
                     }
                 }
             }
         }
     }
 
-    private fun onImportComplete(failedItem: String?, urisToWipe: List<Uri>, rootFile: DocumentFile? = null) {
-        if (failedItem == null){
-            CustomAlertDialogBuilder(this, themeValue)
-                .setTitle(R.string.success_import)
-                .setMessage("""
-                                ${getString(R.string.success_import_msg)}
-                                ${getString(R.string.ask_for_wipe)}
-                                """.trimIndent())
-                .setPositiveButton(R.string.yes) { _, _ ->
-                    lifecycleScope.launch {
-                        val errorMsg = fileOperationService.wipeUris(urisToWipe, rootFile)
-                        if (errorMsg == null) {
-                            Toast.makeText(this@ExplorerActivity, R.string.wipe_successful, Toast.LENGTH_SHORT).show()
-                        } else {
-                            CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                                .setTitle(R.string.error)
-                                .setMessage(getString(R.string.wipe_failed, errorMsg))
-                                .setPositiveButton(R.string.ok, null)
-                                .show()
-                        }
-                    }
+    private fun importFilesFromVolume(srcVolumeId: Int, operationFiles: List<OperationFile>) {
+        checkPathOverwrite(operationFiles, currentDirectoryPath) { items ->
+            if (items != null) {
+                // stop loading thumbnails while writing files
+                explorerAdapter.loadThumbnails = false
+                activityScope.launch {
+                    onTaskResult(
+                        fileOperationService.copyElements(
+                            volumeId,
+                            items,
+                            srcVolumeId
+                        ), R.string.import_failed, R.string.success_import
+                    )
+                    explorerAdapter.loadThumbnails = true
+                    setCurrentPath(currentDirectoryPath)
                 }
-                .setNegativeButton(R.string.no, null)
-                .show()
-        } else {
-            CustomAlertDialogBuilder(this, themeValue)
-                .setTitle(R.string.error)
-                .setMessage(getString(R.string.import_failed, failedItem))
-                .setPositiveButton(R.string.ok, null)
-                .show()
+            }
         }
-        setCurrentPath(currentDirectoryPath)
+
+    }
+
+    private fun onImportComplete(urisToWipe: List<Uri>, rootFile: DocumentFile? = null) {
+        CustomAlertDialogBuilder(this, theme)
+            .setTitle(R.string.success_import)
+            .setMessage("""
+                            ${getString(R.string.success_import_msg)}
+                            ${getString(R.string.ask_for_wipe)}
+                            """.trimIndent())
+            .setPositiveButton(R.string.yes) { _, _ ->
+                activityScope.launch {
+                    onTaskResult(
+                        fileOperationService.wipeUris(urisToWipe, rootFile),
+                        R.string.wipe_failed,
+                        R.string.wipe_successful,
+                    )
+                }
+            }
+            .setNegativeButton(R.string.no, null)
+            .show()
     }
 
     override fun init() {
-        binding = ActivityExplorerBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-        binding.fab.setOnClickListener {
+        super.init()
+        onBackPressedDispatcher.addCallback(this) {
+            if (currentItemAction != ItemsActions.NONE) {
+                cancelItemAction()
+                invalidateOptionsMenu()
+            } else {
+                isEnabled = false
+                onBackPressedDispatcher.onBackPressed()
+                isEnabled = true
+            }
+        }
+        findViewById<FloatingActionButton>(R.id.fab).setOnClickListener {
             if (currentItemAction != ItemsActions.NONE){
                 openDialogCreateFolder()
             } else {
                 val adapter = IconTextDialogAdapter(this)
                 adapter.items = listOf(
-                    listOf("importFromOtherVolumes", R.string.import_from_other_volume, R.drawable.icon_transfert),
+                    listOf("importFromOtherVolumes", R.string.import_from_other_volume, R.drawable.icon_transfer),
                     listOf("importFiles", R.string.import_files, R.drawable.icon_encrypt),
                     listOf("importFolder", R.string.import_folder, R.drawable.icon_import_folder),
                     listOf("createFile", R.string.new_file, R.drawable.icon_file_unknown),
                     listOf("createFolder", R.string.mkdir, R.drawable.icon_create_new_folder),
                     listOf("camera", R.string.camera, R.drawable.icon_photo)
                 )
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setSingleChoiceItems(adapter, -1){ thisDialog, which ->
                         when (adapter.getItem(which)){
                             "importFromOtherVolumes" -> {
                                 val intent = Intent(this, MainActivity::class.java)
                                 intent.action = "pick"
-                                intent.putExtra("volume", encryptedVolume)
-                                isStartingActivity = true
                                 pickFromOtherVolumes.launch(intent)
                             }
                             "importFiles" -> {
-                                isStartingActivity = true
+                                app.isStartingExternalApp = true
                                 pickFiles.launch(arrayOf("*/*"))
                             }
                             "importFolder" -> {
-                                isStartingActivity = true
+                                app.isStartingExternalApp = true
                                 pickImportDirectory.launch(null)
                             }
                             "createFile" -> {
-                                EditTextDialog(this, R.string.enter_file_name) {
-                                    createNewFile(it)
-                                }.show()
+                                createNewFile {
+                                    encryptedVolume.closeFile(it)
+                                    setCurrentPath(currentDirectoryPath)
+                                    invalidateOptionsMenu()
+                                }
                             }
                             "createFolder" -> {
                                 openDialogCreateFolder()
@@ -210,8 +204,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                             "camera" -> {
                                 val intent = Intent(this, CameraActivity::class.java)
                                 intent.putExtra("path", currentDirectoryPath)
-                                intent.putExtra("volume", encryptedVolume)
-                                isStartingActivity = true
+                                intent.putExtra("volumeId", volumeId)
                                 startActivity(intent)
                             }
                         }
@@ -231,31 +224,12 @@ class ExplorerActivity : BaseExplorerActivity() {
         cancelItemAction()
     }
 
-    private fun createNewFile(fileName: String){
-        if (fileName.isEmpty()) {
-            Toast.makeText(this, R.string.error_filename_empty, Toast.LENGTH_SHORT).show()
-        } else {
-            val filePath = PathUtils.pathJoin(currentDirectoryPath, fileName)
-            val handleID = encryptedVolume.openFile(filePath)
-            if (handleID == -1L) {
-                CustomAlertDialogBuilder(this, themeValue)
-                        .setTitle(R.string.error)
-                        .setMessage(R.string.file_creation_failed)
-                        .setPositiveButton(R.string.ok, null)
-                        .show()
-            } else {
-                encryptedVolume.closeFile(handleID)
-                setCurrentPath(currentDirectoryPath)
-                invalidateOptionsMenu()
-            }
-        }
-    }
-
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.explorer, menu)
         val result = super.onCreateOptionsMenu(menu)
         if (currentItemAction != ItemsActions.NONE) {
             menu.findItem(R.id.validate).isVisible = true
+            menu.findItem(R.id.lock).isVisible = false
             menu.findItem(R.id.close).isVisible = false
             supportActionBar?.setDisplayHomeAsUpEnabled(true)
         } else {
@@ -306,11 +280,6 @@ class ExplorerActivity : BaseExplorerActivity() {
             R.id.copy -> {
                 for (i in explorerAdapter.selectedItems){
                     itemsToProcess.add(OperationFile.fromExplorerElement(explorerElements[i]))
-                    if (explorerElements[i].isDirectory){
-                        encryptedVolume.recursiveMapFiles(explorerElements[i].fullPath)?.forEach {
-                            itemsToProcess.add(OperationFile.fromExplorerElement(it))
-                        }
-                    }
                 }
                 currentItemAction = ItemsActions.COPY
                 unselectAll()
@@ -318,26 +287,31 @@ class ExplorerActivity : BaseExplorerActivity() {
             }
             R.id.validate -> {
                 if (currentItemAction == ItemsActions.COPY){
-                    checkPathOverwrite(itemsToProcess, currentDirectoryPath){ items ->
-                        items?.let {
-                            lifecycleScope.launch {
-                                val failedItem = fileOperationService.copyElements(it.toMutableList() as ArrayList<OperationFile>)
-                                if (!isFinishing) {
-                                    if (failedItem == null) {
-                                        Toast.makeText(this@ExplorerActivity, R.string.copy_success, Toast.LENGTH_SHORT).show()
-                                    } else {
-                                        CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                                            .setTitle(R.string.error)
-                                            .setMessage(getString(R.string.copy_failed, failedItem))
-                                            .setPositiveButton(R.string.ok, null)
-                                            .show()
-                                    }
+                    object : LoadingTask<List<OperationFile>>(this, theme, R.string.discovering_files) {
+                        override suspend fun doTask(): List<OperationFile> {
+                            val items = itemsToProcess.toMutableList()
+                            itemsToProcess.filter { it.isDirectory }.forEach { dir ->
+                                encryptedVolume.recursiveMapFiles(dir.srcPath)?.forEach {
+                                    items.add(OperationFile.fromExplorerElement(it))
+                                }
+                            }
+                            return items
+                        }
+                    }.startTask(lifecycleScope) { items ->
+                        checkPathOverwrite(items, currentDirectoryPath) {
+                            it?.let { checkedItems ->
+                                activityScope.launch {
+                                    onTaskResult(
+                                        fileOperationService.copyElements(volumeId, checkedItems),
+                                        R.string.copy_failed,
+                                        R.string.copy_success,
+                                    )
                                     setCurrentPath(currentDirectoryPath)
                                 }
                             }
+                            cancelItemAction()
+                            invalidateOptionsMenu()
                         }
-                        cancelItemAction()
-                        invalidateOptionsMenu()
                     }
                 } else if (currentItemAction == ItemsActions.MOVE){
                     itemsToProcess.forEach {
@@ -351,17 +325,12 @@ class ExplorerActivity : BaseExplorerActivity() {
                         toMove,
                         toClean,
                     ) {
-                        lifecycleScope.launch {
-                            val failedItem = fileOperationService.moveElements(toMove, toClean)
-                            if (failedItem == null) {
-                                Toast.makeText(this@ExplorerActivity, R.string.move_success, Toast.LENGTH_SHORT).show()
-                            } else {
-                                CustomAlertDialogBuilder(this@ExplorerActivity, themeValue)
-                                    .setTitle(R.string.error)
-                                    .setMessage(getString(R.string.move_failed, failedItem))
-                                    .setPositiveButton(R.string.ok, null)
-                                    .show()
-                            }
+                        activityScope.launch {
+                            onTaskResult(
+                                fileOperationService.moveElements(volumeId, toMove, toClean),
+                                R.string.move_success,
+                                R.string.move_failed,
+                            )
                             setCurrentPath(currentDirectoryPath)
                         }
                         cancelItemAction()
@@ -372,9 +341,22 @@ class ExplorerActivity : BaseExplorerActivity() {
             }
             R.id.delete -> {
                 val size = explorerAdapter.selectedItems.size
-                val dialog = CustomAlertDialogBuilder(this, themeValue)
+                val dialog = CustomAlertDialogBuilder(this, theme)
                 dialog.setTitle(R.string.warning)
-                dialog.setPositiveButton(R.string.ok) { _, _ -> removeSelectedItems() }
+                dialog.setPositiveButton(R.string.ok) { _, _ ->
+                    val items = explorerAdapter.selectedItems.map { i -> explorerElements[i] }
+                    activityScope.launch {
+                        fileOperationService.removeElements(volumeId, items)?.let { failedItem ->
+                            CustomAlertDialogBuilder(this@ExplorerActivity, theme)
+                                .setTitle(R.string.error)
+                                .setMessage(getString(R.string.remove_failed, failedItem))
+                                .setPositiveButton(R.string.ok, null)
+                                .show()
+                        }
+                        setCurrentPath(currentDirectoryPath) //refresh
+                    }
+                    unselectAll()
+                }
                 dialog.setNegativeButton(R.string.cancel, null)
                 if (size > 1) {
                     dialog.setMessage(getString(R.string.multiple_delete_confirm, explorerAdapter.selectedItems.size.toString()))
@@ -388,17 +370,30 @@ class ExplorerActivity : BaseExplorerActivity() {
                 true
             }
             R.id.share -> {
-                val paths: MutableList<String> = ArrayList()
-                for (i in explorerAdapter.selectedItems) {
-                    paths.add(explorerElements[i].fullPath)
+                val files = explorerAdapter.selectedItems.map { i ->
+                    explorerElements[i].let {
+                        Pair(it.fullPath, it.stat.size)
+                    }
+                }
+                app.isExporting = true
+                object : LoadingTask<Pair<Intent?, Int?>>(this, theme, R.string.loading_msg_export) {
+                    override suspend fun doTask(): Pair<Intent?, Int?> {
+                        return fileShare.share(files, volumeId)
+                    }
+                }.startTask(lifecycleScope) { (intent, error) ->
+                    if (intent == null) {
+                        onExportFailed(error!!)
+                    } else {
+                        app.isStartingExternalApp = true
+                        startActivity(Intent.createChooser(intent, getString(R.string.share_chooser)))
+                    }
+                    app.isExporting = false
                 }
-                isStartingActivity = true
-                ExternalProvider.share(this, themeValue, encryptedVolume, paths)
                 unselectAll()
                 true
             }
             R.id.decrypt -> {
-                isStartingActivity = true
+                app.isStartingExternalApp = true
                 pickExportDirectory.launch(null)
                 true
             }
@@ -414,7 +409,7 @@ class ExplorerActivity : BaseExplorerActivity() {
     private fun checkMoveOverwrite(items: List<OperationFile>, callback: (List<OperationFile>?) -> Unit) {
         for (item in items) {
             if (encryptedVolume.pathExists(item.dstPath!!) && !item.overwriteConfirmed) {
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.warning)
                     .setMessage(
                         getString(
@@ -493,38 +488,4 @@ class ExplorerActivity : BaseExplorerActivity() {
             itemsToProcess.clear()
         }
     }
-
-    override fun onBackPressed() {
-        if (currentItemAction != ItemsActions.NONE) {
-            cancelItemAction()
-            invalidateOptionsMenu()
-        } else {
-            super.onBackPressed()
-        }
-    }
-
-    private fun removeSelectedItems() {
-        var failedItem: String? = null
-        for (i in explorerAdapter.selectedItems) {
-            val element = explorerAdapter.explorerElements[i]
-            val fullPath = PathUtils.pathJoin(currentDirectoryPath, element.name)
-            if (element.isDirectory) {
-                val result = encryptedVolume.recursiveRemoveDirectory(fullPath)
-                result?.let{ failedItem = it }
-            } else {
-                if (!encryptedVolume.deleteFile(fullPath)) {
-                    failedItem = fullPath
-                }
-            }
-            if (failedItem != null) {
-                CustomAlertDialogBuilder(this, themeValue)
-                        .setTitle(R.string.error)
-                        .setMessage(getString(R.string.remove_failed, failedItem))
-                        .setPositiveButton(R.string.ok, null)
-                        .show()
-                break
-            }
-        }
-        setCurrentPath(currentDirectoryPath) //refresh
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityDrop.kt

@@ -2,19 +2,21 @@ package sushi.hardcore.droidfs.explorers
 
 import android.content.Intent
 import android.net.Uri
+import android.os.Build
 import android.view.Menu
 import android.view.MenuItem
+import com.google.android.material.floatingactionbutton.FloatingActionButton
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.databinding.ActivityExplorerDropBinding
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
+import java.nio.CharBuffer
+import java.nio.charset.StandardCharsets
 
 class ExplorerActivityDrop : BaseExplorerActivity() {
-    private lateinit var binding: ActivityExplorerDropBinding
 
     override fun init() {
-        binding = ActivityExplorerDropBinding.inflate(layoutInflater)
-        setContentView(binding.root)
-        binding.fab.setOnClickListener {
+        super.init()
+        findViewById<FloatingActionButton>(R.id.fab).setOnClickListener {
             openDialogCreateFolder()
         }
     }
@@ -30,35 +32,54 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
         return when (item.itemId) {
             R.id.validate -> {
                 val extras = intent.extras
-                val errorMsg: String? = if (extras != null && extras.containsKey(Intent.EXTRA_STREAM)) {
+                val success = if (extras != null && extras.containsKey(Intent.EXTRA_STREAM)) {
                     when (intent.action) {
                         Intent.ACTION_SEND -> {
-                            val uri = intent.getParcelableExtra<Uri>(Intent.EXTRA_STREAM)
+                            val uri = IntentUtils.getParcelableExtra<Uri>(intent, Intent.EXTRA_STREAM)
                             if (uri == null) {
-                                getString(R.string.share_intent_parsing_failed)
+                                false
                             } else {
                                 importFilesFromUris(listOf(uri), ::onImported)
-                                null
+                                true
                             }
                         }
                         Intent.ACTION_SEND_MULTIPLE -> {
-                            val uris = intent.getParcelableArrayListExtra<Uri>(Intent.EXTRA_STREAM)
+                            val uris: List<Uri>? = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+                                intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM, Uri::class.java)
+                            } else {
+                                @Suppress("Deprecation")
+                                intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM)
+                            }
                             if (uris != null) {
                                 importFilesFromUris(uris, ::onImported)
-                                null
+                                true
                             } else {
-                                getString(R.string.share_intent_parsing_failed)
+                                false
                             }
                         }
-                        else -> getString(R.string.share_intent_parsing_failed)
+                        else -> false
                     }
+                } else if ((intent.clipData?.itemCount ?: 0) > 0) {
+                    val byteBuffer = StandardCharsets.UTF_8.encode(CharBuffer.wrap(intent.clipData!!.getItemAt(0).text))
+                    val byteArray = ByteArray(byteBuffer.remaining())
+                    byteBuffer.get(byteArray)
+                    val size = byteArray.size.toLong()
+                    createNewFile {
+                        var offset = 0L
+                        while (offset < size) {
+                            offset += encryptedVolume.write(it, offset, byteArray, offset, size-offset)
+                        }
+                        encryptedVolume.closeFile(it)
+                        onImported()
+                    }
+                    true
                 } else {
-                    getString(R.string.share_intent_parsing_failed)
+                    false
                 }
-                errorMsg?.let {
-                    CustomAlertDialogBuilder(this, themeValue)
+                if (!success) {
+                    CustomAlertDialogBuilder(this, theme)
                             .setTitle(R.string.error)
-                            .setMessage(it)
+                            .setMessage(R.string.share_intent_parsing_failed)
                             .setPositiveButton(R.string.ok, null)
                             .show()
                 }
@@ -68,23 +89,15 @@ class ExplorerActivityDrop : BaseExplorerActivity() {
         }
     }
 
-    private fun onImported(failedItem: String?){
+    private fun onImported() {
         setCurrentPath(currentDirectoryPath)
-        if (failedItem == null) {
-            CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.success_import)
-                    .setMessage(R.string.success_import_msg)
-                    .setCancelable(false)
-                    .setPositiveButton(R.string.ok){_, _ ->
-                        finish()
-                    }
-                    .show()
-        } else {
-            CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(getString(R.string.import_failed, failedItem))
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-        }
+        CustomAlertDialogBuilder(this, theme)
+            .setTitle(R.string.success_import)
+            .setMessage(R.string.success_import_msg)
+            .setCancelable(false)
+            .setPositiveButton(R.string.ok) { _, _ ->
+                finish()
+            }
+            .show()
     }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerActivityPick.kt

@@ -6,14 +6,15 @@ import android.view.Menu
 import android.view.MenuItem
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
 
 class ExplorerActivityPick : BaseExplorerActivity() {
     private var resultIntent = Intent()
     private var isFinishingIntentionally = false
     override fun init() {
-        super.init()
-        resultIntent.putExtra("volume", encryptedVolume)
+        setContentView(R.layout.activity_explorer_pick)
+        resultIntent.putExtra("volumeId", volumeId)
     }
 
     override fun bindFileOperationService() {
@@ -21,21 +22,18 @@ class ExplorerActivityPick : BaseExplorerActivity() {
     }
 
     override fun onExplorerElementClick(position: Int) {
-        val wasSelecting = explorerAdapter.selectedItems.isNotEmpty()
         if (explorerAdapter.selectedItems.isEmpty()) {
-            if (!wasSelecting) {
-                val fullPath = PathUtils.pathJoin(currentDirectoryPath, explorerElements[position].name)
-                when {
-                    explorerElements[position].isDirectory -> {
-                        setCurrentPath(fullPath)
-                    }
-                    explorerElements[position].isParentFolder -> {
-                        setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
-                    }
-                    else -> {
-                        resultIntent.putExtra("path", fullPath)
-                        returnActivityResult()
-                    }
+            val fullPath = PathUtils.pathJoin(currentDirectoryPath, explorerElements[position].name)
+            when {
+                explorerElements[position].isDirectory -> {
+                    setCurrentPath(fullPath)
+                }
+                explorerElements[position].isParentFolder -> {
+                    setCurrentPath(PathUtils.getParentPath(currentDirectoryPath))
+                }
+                else -> {
+                    resultIntent.putExtra("path", fullPath)
+                    returnActivityResult()
                 }
             }
         }
@@ -80,17 +78,4 @@ class ExplorerActivityPick : BaseExplorerActivity() {
         isFinishingIntentionally = true
         finish()
     }
-
-    override fun closeVolumeOnDestroy() {
-        if (!isFinishingIntentionally && !usf_keep_open){
-            intent.getParcelableExtra<EncryptedVolume>("destinationVolume")?.let { it.close() }
-            super.closeVolumeOnDestroy()
-        }
-    }
-
-    override fun closeVolumeOnUserExit() {
-        isFinishingIntentionally = true
-        super.closeVolumeOnUserExit()
-        super.closeVolumeOnDestroy()
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerElement.kt

@@ -6,7 +6,7 @@ import sushi.hardcore.droidfs.util.PathUtils
 import java.text.Collator
 
 class ExplorerElement(val name: String, val stat: Stat, val parentPath: String) {
-    val fullPath: String = PathUtils.pathJoin(parentPath, name)
+    val fullPath: String = PathUtils.pathJoin(parentPath.ifEmpty { "/" }, name)
     val collationKey = Collator.getInstance().getCollationKeyForFileName(fullPath)
 
     val isDirectory: Boolean

app/src/main/java/sushi/hardcore/droidfs/explorers/ExplorerRouter.kt

@@ -0,0 +1,27 @@
+package sushi.hardcore.droidfs.explorers
+
+import android.content.Context
+import android.content.Intent
+import sushi.hardcore.droidfs.util.IntentUtils
+
+class ExplorerRouter(private val context: Context, private val intent: Intent) {
+    var pickMode = intent.action == "pick"
+    var dropMode = (intent.action == Intent.ACTION_SEND || intent.action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null
+
+    fun getExplorerIntent(volumeId: Int, volumeShortName: String): Intent {
+        var explorerIntent: Intent? = null
+        if (dropMode) { //import via android share menu
+            explorerIntent = Intent(context, ExplorerActivityDrop::class.java)
+            IntentUtils.forwardIntent(intent, explorerIntent)
+        } else if (pickMode) {
+            explorerIntent = Intent(context, ExplorerActivityPick::class.java)
+            explorerIntent.flags = Intent.FLAG_ACTIVITY_FORWARD_RESULT
+        }
+        if (explorerIntent == null) {
+            explorerIntent = Intent(context, ExplorerActivity::class.java) //default opening
+        }
+        explorerIntent.putExtra("volumeId", volumeId)
+        explorerIntent.putExtra("volumeName", volumeShortName)
+        return explorerIntent
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/file_operations/FileOperationNotification.kt

@@ -1,5 +0,0 @@
-package sushi.hardcore.droidfs.file_operations
-
-import androidx.core.app.NotificationCompat
-
-class FileOperationNotification(val notificationBuilder: NotificationCompat.Builder, val notificationId: Int)

app/src/main/java/sushi/hardcore/droidfs/file_operations/FileOperationService.kt

@@ -1,54 +1,182 @@
 package sushi.hardcore.droidfs.file_operations
 
+import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.PendingIntent
 import android.app.Service
+import android.content.ComponentName
+import android.content.Context
 import android.content.Intent
+import android.content.ServiceConnection
+import android.content.pm.ServiceInfo
 import android.net.Uri
 import android.os.Binder
 import android.os.Build
 import android.os.Bundle
 import android.os.IBinder
+import android.provider.Settings
+import android.util.Log
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
+import androidx.core.app.ServiceCompat
+import androidx.core.content.ContextCompat
 import androidx.documentfile.provider.DocumentFile
-import kotlinx.coroutines.*
-import sushi.hardcore.droidfs.ConstValues
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.yield
+import sushi.hardcore.droidfs.BaseActivity
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.NotificationBroadcastReceiver
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.VolumeManager
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.explorers.ExplorerElement
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.filesystems.Stat
+import sushi.hardcore.droidfs.util.AndroidUtils
+import sushi.hardcore.droidfs.util.ObjRef
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.util.Wiper
+import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 import java.io.FileNotFoundException
+import kotlin.coroutines.resume
+import kotlin.coroutines.suspendCoroutine
 
+/**
+ * Foreground service for file operations.
+ *
+ * Clients **must** bind to it using the [bind] method.
+ *
+ * This implementation is not thread-safe. It must only be called from the main UI thread.
+ */
 class FileOperationService : Service() {
-    companion object {
-        const val NOTIFICATION_CHANNEL_ID = "FileOperations"
-        const val ACTION_CANCEL = "file_operation_cancel"
-    }
-
-    private val binder = LocalBinder()
-    private lateinit var encryptedVolume: EncryptedVolume
-    private lateinit var notificationManager: NotificationManagerCompat
-    private val tasks = HashMap<Int, Job>()
-    private var lastNotificationId = 0
 
     inner class LocalBinder : Binder() {
         fun getService(): FileOperationService = this@FileOperationService
-        fun setEncryptedVolume(volume: EncryptedVolume) {
-            encryptedVolume = volume
+    }
+
+    inner class PendingTask<T>(
+        val title: Int,
+        val total: Int?,
+        private val getTask: (Int) -> Deferred<T>,
+        private val onStart: (taskId: Int, job: Deferred<T>) -> Unit,
+    ) {
+        fun start(taskId: Int): Deferred<T> = getTask(taskId).also { onStart(taskId, it) }
+    }
+
+    companion object {
+        const val TAG = "FileOperationService"
+        const val NOTIFICATION_CHANNEL_ID = "FileOperations"
+        const val ACTION_CANCEL = "file_operation_cancel"
+
+        /**
+         * Bind to the service.
+         *
+         * Registers an [ActivityResultLauncher] in the provided activity to request notification permission. Consequently, the activity must not yet be started.
+         *
+         * The activity must stay running while calling the service's methods.
+         *
+         * If multiple activities bind simultaneously, only the latest one will be used by the service.
+         */
+        fun bind(activity: BaseActivity, onBound: (FileOperationService) -> Unit) {
+            val helper = AndroidUtils.NotificationPermissionHelper(activity)
+            lateinit var service: FileOperationService
+            val serviceConnection = object : ServiceConnection {
+                override fun onServiceConnected(className: ComponentName, binder: IBinder) {
+                    onBound((binder as FileOperationService.LocalBinder).getService().also {
+                        service = it
+                        it.notificationPermissionHelpers.addLast(helper)
+                    })
+                }
+                override fun onServiceDisconnected(arg0: ComponentName) {}
+            }
+            activity.lifecycle.addObserver(object : DefaultLifecycleObserver {
+                override fun onDestroy(owner: LifecycleOwner) {
+                    activity.unbindService(serviceConnection)
+                    service.notificationPermissionHelpers.removeLast()
+                }
+            })
+            activity.bindService(
+                Intent(activity, FileOperationService::class.java),
+                serviceConnection,
+                Context.BIND_AUTO_CREATE
+            )
         }
     }
 
-    override fun onBind(p0: Intent?): IBinder {
-        return binder
+    private var isStarted = false
+    private val binder = LocalBinder()
+    private lateinit var volumeManger: VolumeManager
+    private var serviceScope = MainScope()
+    private val notificationPermissionHelpers = ArrayDeque<AndroidUtils.NotificationPermissionHelper<BaseActivity>>(2)
+    private var askForNotificationPermission = true
+    private lateinit var notificationManager: NotificationManagerCompat
+    private val notifications = HashMap<Int, NotificationCompat.Builder>()
+    private var foregroundNotificationId = -1
+    private val tasks = HashMap<Int, Job>()
+    private var newTaskId = 1
+    private var pendingTask: PendingTask<*>? = null
+
+    override fun onCreate() {
+        volumeManger = (application as VolumeManagerApp).volumeManager
     }
 
-    private fun showNotification(message: Int, total: Int?): FileOperationNotification {
-        ++lastNotificationId
-        if (!::notificationManager.isInitialized){
+    override fun onBind(p0: Intent?): IBinder = binder
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        startPendingTask { id, notification ->
+            // on service start, the pending task is the foreground task
+            setForeground(id, notification)
+        }
+        isStarted = true
+        return START_NOT_STICKY
+    }
+
+    override fun onDestroy() {
+        isStarted = false
+    }
+
+    private fun processPendingTask() {
+        if (isStarted) {
+            startPendingTask { id, notification ->
+                if (foregroundNotificationId == -1) {
+                    // service started but not in foreground yet
+                    setForeground(id, notification)
+                } else {
+                    // already running in foreground, just add a new notification
+                    notificationManager.notify(id, notification)
+                }
+            }
+        } else {
+            ContextCompat.startForegroundService(
+                this,
+                Intent(this, FileOperationService::class.java)
+            )
+        }
+    }
+
+    /**
+     * Start the pending task and create an associated notification.
+     */
+    private fun startPendingTask(showNotification: (id: Int, Notification) -> Unit) {
+        val task = pendingTask
+        pendingTask = null
+        if (task == null) {
+            Log.w(TAG, "Started without pending task")
+            return
+        }
+        if (!::notificationManager.isInitialized) {
             notificationManager = NotificationManagerCompat.from(this)
         }
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
@@ -61,90 +189,219 @@ class FileOperationService : Service() {
             )
         }
         val notificationBuilder = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
-        notificationBuilder
-                .setContentTitle(getString(message))
-                .setSmallIcon(R.mipmap.icon_launcher)
-                .setOngoing(true)
-                .addAction(NotificationCompat.Action(
-                    R.drawable.icon_close,
-                    getString(R.string.cancel),
-                    PendingIntent.getBroadcast(
-                        this,
-                        0,
-                        Intent(this, NotificationBroadcastReceiver::class.java).apply {
-                            val bundle = Bundle()
-                            bundle.putBinder("binder", LocalBinder())
-                            bundle.putInt("notificationId", lastNotificationId)
-                            putExtra("bundle", bundle)
-                            action = ACTION_CANCEL
-                        },
-                        PendingIntent.FLAG_UPDATE_CURRENT
-                    )
-                ))
-        if (total != null) {
+            .setContentTitle(getString(task.title))
+            .setSmallIcon(R.drawable.ic_notification)
+            .setOngoing(true)
+            .addAction(NotificationCompat.Action(
+                R.drawable.icon_close,
+                getString(R.string.cancel),
+                PendingIntent.getBroadcast(
+                    this,
+                    newTaskId,
+                    Intent(this, NotificationBroadcastReceiver::class.java).apply {
+                        putExtra("bundle", Bundle().apply {
+                            putBinder("binder", LocalBinder())
+                            putInt("taskId", newTaskId)
+                        })
+                        action = ACTION_CANCEL
+                    },
+                    PendingIntent.FLAG_IMMUTABLE
+                )
+            ))
+        if (task.total != null) {
             notificationBuilder
-                .setContentText("0/$total")
-                .setProgress(total, 0, false)
+                .setContentText("0/${task.total}")
+                .setProgress(task.total, 0, false)
         } else {
             notificationBuilder
                 .setContentText(getString(R.string.discovering_files))
                 .setProgress(0, 0, true)
         }
-        notificationManager.notify(lastNotificationId, notificationBuilder.build())
-        return FileOperationNotification(notificationBuilder, lastNotificationId)
+        showNotification(newTaskId, notificationBuilder.build())
+        notifications[newTaskId] = notificationBuilder
+        tasks[newTaskId] = task.start(newTaskId)
+        newTaskId++
     }
 
-    private fun updateNotificationProgress(notification: FileOperationNotification, progress: Int, total: Int){
-        notification.notificationBuilder
+    private fun setForeground(id: Int, notification: Notification) {
+        ServiceCompat.startForeground(this, id, notification,
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC
+            } else {
+                0
+            }
+        )
+        foregroundNotificationId = id
+    }
+
+    private fun updateNotificationProgress(taskId: Int, progress: Int, total: Int) {
+        val notificationBuilder = notifications[taskId] ?: return
+        notificationBuilder
                 .setProgress(total, progress, false)
                 .setContentText("$progress/$total")
-        notificationManager.notify(notification.notificationId, notification.notificationBuilder.build())
+        notificationManager.notify(taskId, notificationBuilder.build())
     }
 
-    private fun cancelNotification(notification: FileOperationNotification){
-        notificationManager.cancel(notification.notificationId)
+    fun cancelOperation(taskId: Int) {
+        tasks[taskId]?.cancel()
     }
 
-    fun cancelOperation(notificationId: Int){
-        tasks[notificationId]?.cancel()
+    private fun getEncryptedVolume(volumeId: Int): EncryptedVolume {
+        return volumeManger.getVolume(volumeId) ?: throw IllegalArgumentException("Invalid volumeId: $volumeId")
     }
 
-    open class TaskResult<T>(val cancelled: Boolean, val failedItem: T?)
-
-    private suspend fun <T> waitForTask(notification: FileOperationNotification, task: Deferred<T>): TaskResult<T> {
-        tasks[notification.notificationId] = task
-        return try {
-            TaskResult(false, task.await())
-        } catch (e: CancellationException) {
-            TaskResult(true, null)
-        } finally {
-            cancelNotification(notification)
+    /**
+     *  Wait on a task, returning the appropriate [TaskResult].
+     *
+     *  This method also performs cleanup and foreground state management so it must be always used.
+     */
+    private suspend fun <T> waitForTask(
+        taskId: Int,
+        task: Deferred<T>,
+        onCancelled: (suspend () -> Unit)?,
+    ): TaskResult<out T> {
+        return coroutineScope {
+            withContext(serviceScope.coroutineContext) {
+                try {
+                    TaskResult.completed(task.await())
+                } catch (e: CancellationException) {
+                    onCancelled?.invoke()
+                    TaskResult.cancelled()
+                } catch (e: Throwable) {
+                    e.printStackTrace()
+                    TaskResult.error(e.localizedMessage)
+                } finally {
+                    notificationManager.cancel(taskId)
+                    notifications.remove(taskId)
+                    tasks.remove(taskId)
+                    if (tasks.size == 0) {
+                        // last task finished, remove from foreground state but don't stop the service
+                        ServiceCompat.stopForeground(this@FileOperationService, ServiceCompat.STOP_FOREGROUND_REMOVE)
+                        foregroundNotificationId = -1
+                    } else if (taskId == foregroundNotificationId) {
+                        // foreground task finished, falling back to the next one
+                        val entry = notifications.entries.first()
+                        setForeground(entry.key, entry.value.build())
+                    }
+                }
+            }
         }
     }
 
-    private fun copyFile(srcPath: String, dstPath: String, remoteEncryptedVolume: EncryptedVolume = encryptedVolume): Boolean {
+    /**
+     * Create and run a new task until completion.
+     *
+     * Handles notification permission request, service startup and notification management.
+     *
+     * Overrides [pendingTask] without checking! (safe if user is not insanely fast)
+     */
+    private suspend fun <T> newTask(
+        title: Int,
+        total: Int?,
+        getTask: (taskId: Int) -> Deferred<T>,
+        onCancelled: (suspend () -> Unit)?,
+    ): TaskResult<out T> {
+        val startedTask = suspendCoroutine { continuation ->
+            val task = PendingTask(title, total, getTask) { taskId, job ->
+                continuation.resume(Pair(taskId, job))
+            }
+            pendingTask = task
+            if (askForNotificationPermission) {
+                with (notificationPermissionHelpers.last()) {
+                    askAndRun { granted ->
+                        if (granted) {
+                            processPendingTask()
+                        } else {
+                            CustomAlertDialogBuilder(activity, activity.theme)
+                                .setTitle(R.string.warning)
+                                .setMessage(R.string.notification_denied_msg)
+                                .setPositiveButton(R.string.settings) { _, _ ->
+                                    (application as VolumeManagerApp).isStartingExternalApp = true
+                                    activity.startActivity(
+                                        Intent(
+                                            Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+                                            Uri.fromParts("package", packageName, null)
+                                        )
+                                    )
+                                }
+                                .setNegativeButton(R.string.later, null)
+                                .setOnDismissListener { processPendingTask() }
+                                .show()
+                        }
+                    }
+                }
+                askForNotificationPermission = false // only ask once per service instance
+                return@suspendCoroutine
+            }
+            processPendingTask()
+        }
+        return waitForTask(startedTask.first, startedTask.second, onCancelled)
+    }
+
+    private suspend fun <T> volumeTask(
+        title: Int,
+        total: Int?,
+        volumeId: Int,
+        task: suspend (taskId: Int, encryptedVolume: EncryptedVolume) -> T
+    ): TaskResult<out T> {
+        return newTask(title, total, { taskId ->
+            volumeManger.getCoroutineScope(volumeId).async {
+                task(taskId, getEncryptedVolume(volumeId))
+            }
+        }, null)
+    }
+
+    private suspend fun <T> globalTask(
+        title: Int,
+        total: Int?,
+        task: suspend (taskId: Int) -> T,
+        onCancelled: (suspend () -> Unit)? = null,
+    ): TaskResult<out T> {
+        return newTask(title, total, { taskId ->
+            serviceScope.async(Dispatchers.IO) {
+                task(taskId)
+            }
+        }, if (onCancelled == null) {
+            null
+        } else {
+            {
+                serviceScope.launch(Dispatchers.IO) {
+                    onCancelled()
+                }
+            }
+        })
+    }
+
+    private suspend fun copyFile(
+        encryptedVolume: EncryptedVolume,
+        srcPath: String,
+        dstPath: String,
+        srcEncryptedVolume: EncryptedVolume = encryptedVolume,
+    ): Boolean {
         var success = true
-        val srcFileHandle = remoteEncryptedVolume.openFile(srcPath)
+        val srcFileHandle = srcEncryptedVolume.openFileReadMode(srcPath)
         if (srcFileHandle != -1L) {
-            val dstFileHandle = encryptedVolume.openFile(dstPath)
+            val dstFileHandle = encryptedVolume.openFileWriteMode(dstPath)
             if (dstFileHandle != -1L) {
                 var offset: Long = 0
-                val ioBuffer = ByteArray(ConstValues.IO_BUFF_SIZE)
-                var length: Int
-                while (remoteEncryptedVolume.read(srcFileHandle, ioBuffer, offset).also { length = it } > 0) {
-                    val written = encryptedVolume.write(dstFileHandle, offset, ioBuffer, length).toLong()
-                    if (written == length.toLong()) {
+                val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
+                var length: Long
+                while (srcEncryptedVolume.read(srcFileHandle, offset, ioBuffer, 0, ioBuffer.size.toLong()).also { length = it.toLong() } > 0) {
+                    yield()
+                    val written = encryptedVolume.write(dstFileHandle, offset, ioBuffer, 0, length).toLong()
+                    if (written == length) {
                         offset += written
                     } else {
                         success = false
                         break
                     }
                 }
+                encryptedVolume.truncate(dstPath, offset)
                 encryptedVolume.closeFile(dstFileHandle)
             } else {
                 success = false
             }
-            remoteEncryptedVolume.closeFile(srcFileHandle)
+            srcEncryptedVolume.closeFile(srcFileHandle)
         } else {
             success = false
         }
@@ -152,41 +409,36 @@ class FileOperationService : Service() {
     }
 
     suspend fun copyElements(
-        items: ArrayList<OperationFile>,
-        remoteEncryptedVolume: EncryptedVolume = encryptedVolume
-    ): String? = coroutineScope {
-        val notification = showNotification(R.string.file_op_copy_msg, items.size)
-        val task = async {
+        volumeId: Int,
+        items: List<OperationFile>,
+        srcVolumeId: Int = volumeId,
+    ): TaskResult<out String?> {
+        val srcEncryptedVolume = getEncryptedVolume(srcVolumeId)
+        return volumeTask(R.string.file_op_copy_msg, items.size, volumeId) { taskId, encryptedVolume ->
             var failedItem: String? = null
-            for (i in 0 until items.size) {
-                withContext(Dispatchers.IO) {
-                    if (items[i].isDirectory) {
-                        if (!encryptedVolume.pathExists(items[i].dstPath!!)) {
-                            if (!encryptedVolume.mkdir(items[i].dstPath!!)) {
-                                failedItem = items[i].srcPath
-                            }
-                        }
-                    } else {
-                        if (!copyFile(items[i].srcPath, items[i].dstPath!!, remoteEncryptedVolume)) {
+            for (i in items.indices) {
+                yield()
+                if (items[i].isDirectory) {
+                    if (!encryptedVolume.pathExists(items[i].dstPath!!)) {
+                        if (!encryptedVolume.mkdir(items[i].dstPath!!)) {
                             failedItem = items[i].srcPath
                         }
                     }
+                } else if (!copyFile(encryptedVolume, items[i].srcPath, items[i].dstPath!!, srcEncryptedVolume)) {
+                    failedItem = items[i].srcPath
                 }
                 if (failedItem == null) {
-                    updateNotificationProgress(notification, i+1, items.size)
+                    updateNotificationProgress(taskId, i+1, items.size)
                 } else {
                     break
                 }
             }
             failedItem
         }
-        // treat cancellation as success
-        waitForTask(notification, task).failedItem
     }
 
-    suspend fun moveElements(toMove: List<OperationFile>, toClean: List<String>): String? = coroutineScope {
-        val notification = showNotification(R.string.file_op_move_msg, toMove.size)
-        val task = async(Dispatchers.IO) {
+    suspend fun moveElements(volumeId: Int, toMove: List<OperationFile>, toClean: List<String>): TaskResult<out String?> {
+        return volumeTask(R.string.file_op_move_msg, toMove.size, volumeId) { taskId, encryptedVolume ->
             val total = toMove.size+toClean.size
             var failedItem: String? = null
             for ((i, item) in toMove.withIndex()) {
@@ -194,7 +446,7 @@ class FileOperationService : Service() {
                     failedItem = item.srcPath
                     break
                 } else {
-                    updateNotificationProgress(notification, i+1, total)
+                    updateNotificationProgress(taskId, i+1, total)
                 }
             }
             if (failedItem == null) {
@@ -203,34 +455,32 @@ class FileOperationService : Service() {
                         failedItem = folderPath
                         break
                     } else {
-                        updateNotificationProgress(notification, toMove.size+i+1, total)
+                        updateNotificationProgress(taskId, toMove.size+i+1, total)
                     }
                 }
             }
             failedItem
         }
-        // treat cancellation as success
-        waitForTask(notification, task).failedItem
     }
 
     private suspend fun importFilesFromUris(
+        encryptedVolume: EncryptedVolume,
         dstPaths: List<String>,
         uris: List<Uri>,
-        notification: FileOperationNotification,
+        taskId: Int,
     ): String? {
         var failedIndex = -1
         for (i in dstPaths.indices) {
-            withContext(Dispatchers.IO) {
-                try {
-                    if (!encryptedVolume.importFile(this@FileOperationService, uris[i], dstPaths[i])) {
-                        failedIndex = i
-                    }
-                } catch (e: FileNotFoundException) {
+            yield()
+            try {
+                if (!encryptedVolume.importFile(this@FileOperationService, uris[i], dstPaths[i])) {
                     failedIndex = i
                 }
+            } catch (e: FileNotFoundException) {
+                failedIndex = i
             }
             if (failedIndex == -1) {
-                updateNotificationProgress(notification, i+1, dstPaths.size)
+                updateNotificationProgress(taskId, i+1, dstPaths.size)
             } else {
                 return uris[failedIndex].toString()
             }
@@ -238,94 +488,75 @@ class FileOperationService : Service() {
         return null
     }
 
-    suspend fun importFilesFromUris(dstPaths: List<String>, uris: List<Uri>): TaskResult<String?> = coroutineScope {
-        val notification = showNotification(R.string.file_op_import_msg, dstPaths.size)
-        val task = async {
-            importFilesFromUris(dstPaths, uris, notification)
+    suspend fun importFilesFromUris(volumeId: Int, dstPaths: List<String>, uris: List<Uri>): TaskResult<out String?> {
+        return volumeTask(R.string.file_op_import_msg, dstPaths.size, volumeId) { taskId, encryptedVolume ->
+            importFilesFromUris(encryptedVolume, dstPaths, uris, taskId)
         }
-        waitForTask(notification, task)
     }
 
     /**
      * Map the content of an unencrypted directory to prepare its import
      *
      * Contents of dstFiles and srcUris, at the same index, will match each other
-     *
-     * @return false if cancelled early, true otherwise.
      */
-    private fun recursiveMapDirectoryForImport(
+    private suspend fun recursiveMapDirectoryForImport(
         rootSrcDir: DocumentFile,
         rootDstPath: String,
         dstFiles: ArrayList<String>,
         srcUris: ArrayList<Uri>,
         dstDirs: ArrayList<String>,
-        scope: CoroutineScope,
-    ): Boolean {
+    ) {
         dstDirs.add(rootDstPath)
         for (child in rootSrcDir.listFiles()) {
-            if (!scope.isActive) {
-                return false
-            }
+            yield()
             child.name?.let { name ->
                 val subPath = PathUtils.pathJoin(rootDstPath, name)
                 if (child.isDirectory) {
-                    if (!recursiveMapDirectoryForImport(child, subPath, dstFiles, srcUris, dstDirs, scope)) {
-                        return false
-                    }
-                }
-                else if (child.isFile) {
+                    recursiveMapDirectoryForImport(child, subPath, dstFiles, srcUris, dstDirs)
+                } else if (child.isFile) {
                     srcUris.add(child.uri)
                     dstFiles.add(subPath)
                 }
             }
         }
-        return true
     }
 
-    class ImportDirectoryResult(val taskResult: TaskResult<String?>, val uris: List<Uri>)
+    class ImportDirectoryResult(val taskResult: TaskResult<out String?>, val uris: List<Uri>)
 
     suspend fun importDirectory(
+        volumeId: Int,
         rootDstPath: String,
         rootSrcDir: DocumentFile,
-    ): ImportDirectoryResult = coroutineScope {
-        val notification = showNotification(R.string.file_op_import_msg, null)
+    ): ImportDirectoryResult {
         val srcUris = arrayListOf<Uri>()
-        val task = async {
+        return ImportDirectoryResult(volumeTask(R.string.file_op_import_msg, null, volumeId) { taskId, encryptedVolume ->
             var failedItem: String? = null
             val dstFiles = arrayListOf<String>()
             val dstDirs = arrayListOf<String>()
-
-            withContext(Dispatchers.IO) {
-                if (!recursiveMapDirectoryForImport(rootSrcDir, rootDstPath, dstFiles, srcUris, dstDirs, this)) {
-                    return@withContext
-                }
-
-                // create destination folders so the new files can use them
-                for (dir in dstDirs) {
-                    if (!encryptedVolume.mkdir(dir)) {
-                        failedItem = dir
-                        break
-                    }
+            recursiveMapDirectoryForImport(rootSrcDir, rootDstPath, dstFiles, srcUris, dstDirs)
+            // create destination folders so the new files can use them
+            for (dir in dstDirs) {
+                // if directory creation fails, check if it was already present
+                if (!encryptedVolume.mkdir(dir) && encryptedVolume.getAttr(dir)?.type != Stat.S_IFDIR) {
+                    failedItem = dir
+                    break
                 }
             }
             if (failedItem == null) {
-                failedItem = importFilesFromUris(dstFiles, srcUris, notification)
+                failedItem = importFilesFromUris(encryptedVolume, dstFiles, srcUris, taskId)
             }
             failedItem
-        }
-        ImportDirectoryResult(waitForTask(notification, task), srcUris)
+        }, srcUris)
     }
 
-    suspend fun wipeUris(uris: List<Uri>, rootFile: DocumentFile? = null): String? = coroutineScope {
-        val notification = showNotification(R.string.file_op_wiping_msg, uris.size)
-        val task = async {
+    suspend fun wipeUris(uris: List<Uri>, rootFile: DocumentFile? = null): TaskResult<out String?> {
+        return globalTask(R.string.file_op_wiping_msg, uris.size, { taskId ->
             var errorMsg: String? = null
             for (i in uris.indices) {
-                withContext(Dispatchers.IO) {
-                    errorMsg = Wiper.wipe(this@FileOperationService, uris[i])
-                }
+                yield()
+                errorMsg = Wiper.wipe(this@FileOperationService, uris[i])
                 if (errorMsg == null) {
-                    updateNotificationProgress(notification, i+1, uris.size)
+                    updateNotificationProgress(taskId, i+1, uris.size)
                 } else {
                     break
                 }
@@ -334,12 +565,10 @@ class FileOperationService : Service() {
                 rootFile?.delete()
             }
             errorMsg
-        }
-        // treat cancellation as success
-        waitForTask(notification, task).failedItem
+        })
     }
 
-    private fun exportFileInto(srcPath: String, treeDocumentFile: DocumentFile): Boolean {
+    private fun exportFileInto(encryptedVolume: EncryptedVolume, srcPath: String, treeDocumentFile: DocumentFile): Boolean {
         val outputStream = treeDocumentFile.createFile("*/*", File(srcPath).name)?.uri?.let {
             contentResolver.openOutputStream(it)
         }
@@ -350,25 +579,20 @@ class FileOperationService : Service() {
         }
     }
 
-    private fun recursiveExportDirectory(
+    private suspend fun recursiveExportDirectory(
+        encryptedVolume: EncryptedVolume,
         plain_directory_path: String,
         treeDocumentFile: DocumentFile,
-        scope: CoroutineScope
     ): String? {
         treeDocumentFile.createDirectory(File(plain_directory_path).name)?.let { childTree ->
             val explorerElements = encryptedVolume.readDir(plain_directory_path) ?: return null
             for (e in explorerElements) {
-                if (!scope.isActive) {
-                    return null
-                }
+                yield()
                 val fullPath = PathUtils.pathJoin(plain_directory_path, e.name)
                 if (e.isDirectory) {
-                    val failedItem = recursiveExportDirectory(fullPath, childTree, scope)
-                    failedItem?.let { return it }
-                } else {
-                    if (!exportFileInto(fullPath, childTree)){
-                        return fullPath
-                    }
+                    recursiveExportDirectory(encryptedVolume, fullPath, childTree)?.let { return it }
+                } else if (!exportFileInto(encryptedVolume, fullPath, childTree)) {
+                    return fullPath
                 }
             }
             return null
@@ -376,62 +600,94 @@ class FileOperationService : Service() {
         return treeDocumentFile.name
     }
 
-    suspend fun exportFiles(uri: Uri, items: List<ExplorerElement>): TaskResult<String?> = coroutineScope {
-        val notification = showNotification(R.string.file_op_export_msg, items.size)
-        val task = async {
-            contentResolver.takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
+    suspend fun exportFiles(volumeId: Int, items: List<ExplorerElement>, uri: Uri): TaskResult<out String?> {
+        return volumeTask(R.string.file_op_export_msg, items.size, volumeId) { taskId, encryptedVolume ->
             val treeDocumentFile = DocumentFile.fromTreeUri(this@FileOperationService, uri)!!
             var failedItem: String? = null
             for (i in items.indices) {
-                withContext(Dispatchers.IO) {
-                    failedItem = if (items[i].isDirectory) {
-                        recursiveExportDirectory(items[i].fullPath, treeDocumentFile, this)
+                yield()
+                failedItem = if (items[i].isDirectory) {
+                    recursiveExportDirectory(encryptedVolume, items[i].fullPath, treeDocumentFile)
+                } else {
+                    if (exportFileInto(encryptedVolume, items[i].fullPath, treeDocumentFile)) {
+                        null
                     } else {
-                        if (exportFileInto(items[i].fullPath, treeDocumentFile)) null else items[i].fullPath
+                        items[i].fullPath
                     }
                 }
                 if (failedItem == null) {
-                    updateNotificationProgress(notification, i+1, items.size)
+                    updateNotificationProgress(taskId, i+1, items.size)
                 } else {
                     break
                 }
             }
             failedItem
         }
-        waitForTask(notification, task)
     }
 
-    private fun recursiveCountChildElements(rootDirectory: DocumentFile, scope: CoroutineScope): Int {
-        if (!scope.isActive) {
-            return 0
+    private suspend fun recursiveRemoveDirectory(encryptedVolume: EncryptedVolume, path: String): String? {
+        encryptedVolume.readDir(path)?.let { elements ->
+            for (e in elements) {
+                yield()
+                val fullPath = PathUtils.pathJoin(path, e.name)
+                if (e.isDirectory) {
+                    recursiveRemoveDirectory(encryptedVolume, fullPath)?.let { return it }
+                } else if (!encryptedVolume.deleteFile(fullPath)) {
+                    return fullPath
+                }
+            }
         }
+        return if (!encryptedVolume.rmdir(path)) {
+            path
+        } else {
+            null
+        }
+    }
+
+    suspend fun removeElements(volumeId: Int, items: List<ExplorerElement>): String? {
+        return volumeTask(R.string.file_op_delete_msg, items.size, volumeId) { taskId, encryptedVolume ->
+            var failedItem: String? = null
+            for ((i, element) in items.withIndex()) {
+                yield()
+                if (element.isDirectory) {
+                    recursiveRemoveDirectory(encryptedVolume, element.fullPath)?.let { failedItem = it }
+                } else if (!encryptedVolume.deleteFile(element.fullPath)) {
+                    failedItem = element.fullPath
+                }
+                if (failedItem == null) {
+                    updateNotificationProgress(taskId, i + 1, items.size)
+                } else {
+                    break
+                }
+            }
+            failedItem
+        }.failedItem // treat cancellation as success
+    }
+
+    private suspend fun recursiveCountChildElements(rootDirectory: DocumentFile): Int {
+        yield()
         val children = rootDirectory.listFiles()
         var count = children.size
         for (child in children) {
             if (child.isDirectory) {
-                count += recursiveCountChildElements(child, scope)
+                count += recursiveCountChildElements(child)
             }
         }
         return count
     }
 
-    internal class ObjRef<T>(var value: T)
-
-    private fun recursiveCopyVolume(
+    private suspend fun recursiveCopyVolume(
         src: DocumentFile,
         dst: DocumentFile,
         dstRootDirectory: ObjRef<DocumentFile?>?,
-        notification: FileOperationNotification,
+        taskId: Int,
         total: Int,
-        scope: CoroutineScope,
         progress: ObjRef<Int> = ObjRef(0)
     ): DocumentFile? {
         val dstDir = dst.createDirectory(src.name ?: return src) ?: return src
         dstRootDirectory?.let { it.value = dstDir }
         for (child in src.listFiles()) {
-            if (!scope.isActive) {
-                return null
-            }
+            yield()
             if (child.isFile) {
                 val dstFile = dstDir.createFile("", child.name ?: return child) ?: return child
                 val outputStream = contentResolver.openOutputStream(dstFile.uri)
@@ -442,29 +698,25 @@ class FileOperationService : Service() {
                 inputStream.close()
                 if (written != child.length()) return child
             } else {
-                recursiveCopyVolume(child, dstDir, null, notification, total, scope, progress)?.let { return it }
+                recursiveCopyVolume(child, dstDir, null, taskId, total, progress)?.let { return it }
             }
             progress.value++
-            updateNotificationProgress(notification, progress.value, total)
+            updateNotificationProgress(taskId, progress.value, total)
         }
         return null
     }
 
-    class CopyVolumeResult(val taskResult: TaskResult<DocumentFile?>, val dstRootDirectory: DocumentFile?)
+    class CopyVolumeResult(val taskResult: TaskResult<out DocumentFile?>, val dstRootDirectory: DocumentFile?)
 
-    suspend fun copyVolume(src: DocumentFile, dst: DocumentFile): CopyVolumeResult = coroutineScope {
-        val notification = showNotification(R.string.copy_volume_notification, null)
+    suspend fun copyVolume(src: DocumentFile, dst: DocumentFile): CopyVolumeResult {
         val dstRootDirectory = ObjRef<DocumentFile?>(null)
-        val task = async(Dispatchers.IO) {
-            val total = recursiveCountChildElements(src, this)
-            if (isActive) {
-                updateNotificationProgress(notification, 0, total)
-                recursiveCopyVolume(src, dst, dstRootDirectory, notification, total, this)
-            } else {
-                null
-            }
-        }
-        // treat cancellation as success
-        CopyVolumeResult(waitForTask(notification, task), dstRootDirectory.value)
+        val result = globalTask(R.string.copy_volume_notification, null, { taskId ->
+            val total = recursiveCountChildElements(src)
+            updateNotificationProgress(taskId, 0, total)
+            recursiveCopyVolume(src, dst, dstRootDirectory, taskId, total)
+        }, {
+            dstRootDirectory.value?.delete()
+        })
+        return CopyVolumeResult(result, dstRootDirectory.value)
     }
 }

app/src/main/java/sushi/hardcore/droidfs/file_operations/NotificationBroadcastReceiver.kt

@@ -1,19 +0,0 @@
-package sushi.hardcore.droidfs.file_operations
-
-import android.content.BroadcastReceiver
-import android.content.Context
-import android.content.Intent
-
-class NotificationBroadcastReceiver: BroadcastReceiver() {
-    override fun onReceive(context: Context, intent: Intent) {
-        if (intent.action == FileOperationService.ACTION_CANCEL){
-            intent.getBundleExtra("bundle")?.let { bundle ->
-                (bundle.getBinder("binder") as FileOperationService.LocalBinder?)?.let { binder ->
-                    val notificationId = bundle.getInt("notificationId")
-                    val service = binder.getService()
-                    service.cancelOperation(notificationId)
-                }
-            }
-        }
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/file_operations/TaskResult.kt

@@ -0,0 +1,47 @@
+package sushi.hardcore.droidfs.file_operations
+
+import android.content.Context
+import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
+import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
+
+class TaskResult<T> private constructor(val state: State, val failedItem: T?, val errorMessage: String?) {
+    enum class State {
+        SUCCESS,
+        /**
+         * Task completed but failed
+         */
+        FAILED,
+        /**
+         * Task thrown an exception
+         */
+        ERROR,
+        CANCELLED,
+    }
+
+    fun showErrorAlertDialog(context: Context, theme: Theme) {
+        CustomAlertDialogBuilder(context, theme)
+            .setTitle(R.string.error)
+            .setMessage(context.getString(R.string.task_failed, errorMessage))
+            .setPositiveButton(R.string.ok, null)
+            .show()
+    }
+
+    companion object {
+        fun <T> completed(failedItem: T?): TaskResult<T> {
+            return if (failedItem == null) {
+                TaskResult(State.SUCCESS, null, null)
+            } else {
+                TaskResult(State.FAILED, failedItem, null)
+            }
+        }
+
+        fun <T> error(errorMessage: String?): TaskResult<T> {
+            return TaskResult(State.ERROR, null, errorMessage)
+        }
+
+        fun <T> cancelled(): TaskResult<T> {
+            return TaskResult(State.CANCELLED, null, null)
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/file_viewers/AudioPlayer.kt

@@ -1,8 +1,11 @@
 package sushi.hardcore.droidfs.file_viewers
 
-import com.google.android.exoplayer2.ExoPlayer
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.ExoPlayer
 import sushi.hardcore.droidfs.databinding.ActivityAudioPlayerBinding
 
+@OptIn(UnstableApi::class)
 class AudioPlayer: MediaPlayer(){
     private lateinit var binding: ActivityAudioPlayerBinding
 

app/src/main/java/sushi/hardcore/droidfs/file_viewers/EncryptedVolumeDataSource.kt

@@ -1,27 +1,37 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.net.Uri
-import com.google.android.exoplayer2.upstream.DataSource
-import com.google.android.exoplayer2.upstream.DataSpec
-import com.google.android.exoplayer2.upstream.TransferListener
-import sushi.hardcore.droidfs.ConstValues
+import androidx.media3.common.C
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DataSource
+import androidx.media3.datasource.DataSpec
+import androidx.media3.datasource.TransferListener
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
-import kotlin.math.ceil
 import kotlin.math.min
 
-class EncryptedVolumeDataSource(private val encryptedVolume: EncryptedVolume, private val filePath: String): DataSource {
+@OptIn(UnstableApi::class)
+class EncryptedVolumeDataSource(private val encryptedVolume: EncryptedVolume, private val filePath: String):
+    DataSource {
     private var fileHandle = -1L
-    private var fileSize: Long = -1
     private var fileOffset: Long = 0
+    private var bytesRemaining: Long = -1
+
     override fun open(dataSpec: DataSpec): Long {
+        fileHandle = encryptedVolume.openFileReadMode(filePath)
         fileOffset = dataSpec.position
-        fileHandle = encryptedVolume.openFile(filePath)
-        fileSize = encryptedVolume.getAttr(filePath)!!.size
-        return fileSize
+        val fileSize = encryptedVolume.getAttr(filePath)!!.size
+        bytesRemaining = if (dataSpec.length == C.LENGTH_UNSET.toLong()) {
+            fileSize - fileOffset
+        } else {
+            min(fileSize, dataSpec.length)
+        }
+        return bytesRemaining
     }
 
     override fun getUri(): Uri {
-        return ConstValues.FAKE_URI
+        return Constants.FAKE_URI
     }
 
     override fun close() {
@@ -33,23 +43,22 @@ class EncryptedVolumeDataSource(private val encryptedVolume: EncryptedVolume, pr
     }
 
     override fun read(buffer: ByteArray, offset: Int, readLength: Int): Int {
-        if (fileOffset >= fileSize){
-            return -1
+        val originalOffset = fileOffset
+        while (fileOffset < originalOffset+readLength && encryptedVolume.read(
+                fileHandle,
+                fileOffset,
+                buffer,
+                offset+(fileOffset-originalOffset),
+                (originalOffset+readLength)-fileOffset
+            ).also { fileOffset += it } > 0
+        ) {}
+        val totalRead = fileOffset-originalOffset
+        bytesRemaining -= totalRead
+        return if (totalRead == 0L) {
+            C.RESULT_END_OF_INPUT
+        } else {
+            totalRead.toInt()
         }
-        var totalRead = 0
-        for (i in 0 until ceil(readLength.toDouble()/ConstValues.MAX_KERNEL_WRITE).toInt()){
-            val tmpReadLength = min(readLength-totalRead, ConstValues.MAX_KERNEL_WRITE)
-            val tmpBuff = if (fileOffset+tmpReadLength > fileSize){
-                ByteArray((fileSize-fileOffset).toInt())
-            } else {
-                ByteArray(tmpReadLength)
-            }
-            val read = encryptedVolume.read(fileHandle, tmpBuff, fileOffset)
-            System.arraycopy(tmpBuff, 0, buffer, offset+totalRead, read)
-            fileOffset += read
-            totalRead += read
-        }
-        return totalRead
     }
 
     class Factory(private val encryptedVolume: EncryptedVolume, private val filePath: String): DataSource.Factory {

app/src/main/java/sushi/hardcore/droidfs/file_viewers/FileViewerActivity.kt

@@ -1,16 +1,29 @@
 package sushi.hardcore.droidfs.file_viewers
 
+import android.os.Build
 import android.os.Bundle
 import android.view.View
+import android.view.WindowInsets
+import android.widget.FrameLayout
+import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
+import androidx.core.view.updateLayoutParams
+import androidx.core.view.updateMargins
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import sushi.hardcore.droidfs.BaseActivity
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.FileTypes
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
+import sushi.hardcore.droidfs.VolumeManagerApp
 import sushi.hardcore.droidfs.explorers.ExplorerElement
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.finishOnClose
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 
 abstract class FileViewerActivity: BaseActivity() {
@@ -19,67 +32,103 @@ abstract class FileViewerActivity: BaseActivity() {
     private lateinit var originalParentPath: String
     private lateinit var windowInsetsController: WindowInsetsControllerCompat
     private var windowTypeMask = 0
-    private var isFinishingIntentionally = false
-    private var usf_keep_open = false
     private var foldersFirst = true
     private var wasMapped = false
     protected val mappedPlaylist = mutableListOf<ExplorerElement>()
     protected var currentPlaylistIndex = -1
-    private val legacyMod by lazy {
-        sharedPrefs.getBoolean("legacyMod", false)
-    }
+    private val isLegacyFullscreen = Build.VERSION.SDK_INT <= Build.VERSION_CODES.R
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         filePath = intent.getStringExtra("path")!!
         originalParentPath = PathUtils.getParentPath(filePath)
-        encryptedVolume = intent.getParcelableExtra("volume")!!
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
+        encryptedVolume = (application as VolumeManagerApp).volumeManager.getVolume(
+            intent.getIntExtra("volumeId", -1)
+        )!!
+        finishOnClose(encryptedVolume)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         windowInsetsController = WindowInsetsControllerCompat(window, window.decorView)
         windowInsetsController.addOnControllableInsetsChangedListener { _, typeMask ->
             windowTypeMask = typeMask
         }
-        hideSystemUi()
+        windowInsetsController.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_DEFAULT
         viewFile()
     }
 
+    open fun showPartialSystemUi() {
+        if (isLegacyFullscreen) {
+            @Suppress("Deprecation")
+            window.decorView.systemUiVisibility =
+                View.SYSTEM_UI_FLAG_FULLSCREEN or
+                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+        } else {
+            windowInsetsController.hide(WindowInsetsCompat.Type.statusBars())
+            windowInsetsController.show(WindowInsetsCompat.Type.navigationBars())
+        }
+    }
+
     open fun hideSystemUi() {
-        if (legacyMod) {
+        if (isLegacyFullscreen) {
             @Suppress("Deprecation")
             window.decorView.systemUiVisibility =
                 View.SYSTEM_UI_FLAG_LOW_PROFILE or
-                View.SYSTEM_UI_FLAG_FULLSCREEN
+                View.SYSTEM_UI_FLAG_FULLSCREEN or
+                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
+                View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
         } else {
-            windowInsetsController.hide(WindowInsetsCompat.Type.statusBars())
+            windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                window.setDecorFitsSystemWindows(false)
+            }
+        }
+    }
+
+    protected fun applyNavigationBarMargin(root: View) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            ViewCompat.setOnApplyWindowInsetsListener(root) { _, insets ->
+                root.updateLayoutParams<FrameLayout.LayoutParams> {
+                    val newInsets = insets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars())
+                    this.updateMargins(
+                        left = newInsets.left,
+                        top = newInsets.top,
+                        right = newInsets.right,
+                        bottom = newInsets.bottom
+                    )
+                }
+                insets
+            }
+        } else {
+            root.fitsSystemWindows = true
         }
     }
 
     abstract fun getFileType(): String
     abstract fun viewFile()
 
-    override fun onUserInteraction() {
-        super.onUserInteraction()
-        if (windowTypeMask and WindowInsetsCompat.Type.statusBars() == 0) {
-            hideSystemUi()
-        }
-    }
-
-    protected fun loadWholeFile(path: String, fileSize: Long? = null): ByteArray? {
-        val result = encryptedVolume.loadWholeFile(path, size = fileSize)
-        if (result.second != 0) {
-            val dialog = CustomAlertDialogBuilder(this, themeValue)
-                .setTitle(R.string.error)
-                .setCancelable(false)
-                .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
-            when (result.second) {
-                1 -> dialog.setMessage(R.string.get_size_failed)
-                2 -> dialog.setMessage(R.string.outofmemoryerror_msg)
-                else -> dialog.setMessage(R.string.read_file_failed)
+    protected fun loadWholeFile(path: String, fileSize: Long? = null, callback: (ByteArray) -> Unit) {
+        lifecycleScope.launch(Dispatchers.IO) {
+            val result = encryptedVolume.loadWholeFile(path, size = fileSize)
+            if (isActive) {
+                withContext(Dispatchers.Main) {
+                    if (result.second == 0) {
+                        callback(result.first!!)
+                    } else {
+                        val dialog = CustomAlertDialogBuilder(this@FileViewerActivity, theme)
+                            .setTitle(R.string.error)
+                            .setCancelable(false)
+                            .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
+                        when (result.second) {
+                            1 -> dialog.setMessage(R.string.get_size_failed)
+                            2 -> dialog.setMessage(R.string.outofmemoryerror_msg)
+                            3 -> dialog.setMessage(R.string.read_file_failed)
+                            4 -> dialog.setMessage(R.string.io_error)
+                        }
+                        dialog.show()
+                    }
+                }
             }
-            dialog.show()
         }
-        return result.first
     }
 
     protected fun createPlaylist() {
@@ -87,7 +136,7 @@ abstract class FileViewerActivity: BaseActivity() {
             encryptedVolume.recursiveMapFiles(originalParentPath)?.let { elements ->
                 for (e in elements) {
                     if (e.isRegularFile) {
-                        if (ConstValues.isExtensionType(getFileType(), e.name) || filePath == e.fullPath) {
+                        if (FileTypes.isExtensionType(getFileType(), e.name) || filePath == e.fullPath) {
                             mappedPlaylist.add(e)
                         }
                     }
@@ -127,27 +176,6 @@ abstract class FileViewerActivity: BaseActivity() {
     }
 
     protected fun goBackToExplorer() {
-        isFinishingIntentionally = true
         finish()
     }
-
-    override fun onDestroy() {
-        super.onDestroy()
-        if (!isFinishingIntentionally) {
-            encryptedVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!usf_keep_open) {
-            finish()
-        }
-    }
-
-    override fun onBackPressed() {
-        super.onBackPressed()
-        isFinishingIntentionally = true
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/ImageViewer.kt

@@ -1,9 +1,7 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.content.res.Configuration
-import android.content.res.Resources
 import android.graphics.Bitmap
-import android.graphics.BitmapFactory
 import android.graphics.Matrix
 import android.graphics.drawable.Drawable
 import android.os.Handler
@@ -11,12 +9,14 @@ import android.view.MotionEvent
 import android.view.View
 import android.view.WindowManager
 import android.widget.Toast
-import androidx.exifinterface.media.ExifInterface
+import androidx.activity.addCallback
+import androidx.activity.viewModels
+import androidx.lifecycle.ViewModel
 import com.bumptech.glide.Glide
 import com.bumptech.glide.RequestBuilder
 import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool
 import com.bumptech.glide.load.resource.bitmap.BitmapTransformation
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.databinding.ActivityImageViewerBinding
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
@@ -33,19 +33,23 @@ class ImageViewer: FileViewerActivity() {
         private const val MIN_SWIPE_DISTANCE = 150
     }
 
+    class ImageViewModel : ViewModel() {
+        var imageBytes: ByteArray? = null
+        var rotationAngle: Float = 0f
+    }
+
     private lateinit var fileName: String
     private lateinit var handler: Handler
-    private var bitmap: Bitmap? = null
+    private val imageViewModel: ImageViewModel by viewModels()
     private var requestBuilder: RequestBuilder<Drawable>? = null
     private var x1 = 0F
     private var x2 = 0F
     private var slideshowActive = false
-    private var originalOrientation: Float = 0f
-    private var rotationAngle: Float = 0F
     private var orientationTransformation: OrientationTransformation? = null
     private val hideUI = Runnable {
         binding.actionButtons.visibility = View.GONE
         binding.topBar.visibility = View.GONE
+        hideSystemUi()
     }
     private val slideshowNext = Runnable {
         if (slideshowActive){
@@ -63,6 +67,8 @@ class ImageViewer: FileViewerActivity() {
         binding = ActivityImageViewerBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.hide()
+        showPartialSystemUi()
+        applyNavigationBarMargin(binding.root)
         handler = Handler(mainLooper)
         binding.imageViewer.setOnInteractionListener(object : ZoomableImageView.OnInteractionListener {
             override fun onSingleTap(event: MotionEvent?) {
@@ -70,6 +76,7 @@ class ImageViewer: FileViewerActivity() {
                 if (binding.actionButtons.visibility == View.GONE) {
                     binding.actionButtons.visibility = View.VISIBLE
                     binding.topBar.visibility = View.VISIBLE
+                    showPartialSystemUi()
                     handler.postDelayed(hideUI, hideDelay)
                 } else {
                     hideUI.run()
@@ -94,7 +101,7 @@ class ImageViewer: FileViewerActivity() {
             }
         })
         binding.imageDelete.setOnClickListener {
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .keepFullScreen()
                 .setTitle(R.string.warning)
                 .setPositiveButton(R.string.ok) { _, _ ->
@@ -105,10 +112,10 @@ class ImageViewer: FileViewerActivity() {
                         if (mappedPlaylist.size == 0) { //deleted all images of the playlist
                             goBackToExplorer()
                         } else {
-                            loadImage()
+                            loadImage(true)
                         }
                     } else {
-                        CustomAlertDialogBuilder(this, themeValue)
+                        CustomAlertDialogBuilder(this, theme)
                             .keepFullScreen()
                             .setTitle(R.string.error)
                             .setMessage(getString(R.string.remove_failed, fileName))
@@ -123,7 +130,7 @@ class ImageViewer: FileViewerActivity() {
         binding.imageButtonSlideshow.setOnClickListener {
             if (!slideshowActive){
                 slideshowActive = true
-                handler.postDelayed(slideshowNext, ConstValues.SLIDESHOW_DELAY)
+                handler.postDelayed(slideshowNext, Constants.SLIDESHOW_DELAY)
                 window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
                 hideUI.run()
                 Toast.makeText(this, R.string.slideshow_started, Toast.LENGTH_SHORT).show()
@@ -143,64 +150,39 @@ class ImageViewer: FileViewerActivity() {
                 swipeImage(-1F)
             }
         }
-        binding.imageRotateRight.setOnClickListener {
-            rotationAngle += 90
-            rotateImage()
+        binding.imageRotateRight.setOnClickListener { onClickRotate(90f) }
+        binding.imageRotateLeft.setOnClickListener { onClickRotate(-90f) }
+        onBackPressedDispatcher.addCallback(this) {
+            if (slideshowActive) {
+                stopSlideshow()
+            } else {
+                askSaveRotation {
+                    isEnabled = false
+                    onBackPressedDispatcher.onBackPressed()
+                }
+            }
         }
-        binding.imageRotateLeft.setOnClickListener {
-            rotationAngle -= 90
-            rotateImage()
-        }
-        loadImage()
+        loadImage(false)
         handler.postDelayed(hideUI, hideDelay)
     }
 
-    private fun loadImage(){
-        bitmap = null
-        requestBuilder = null
-        loadWholeFile(filePath)?.let {
-            val displayWithGlide = if (it.size < 5_000_000) {
-                true
-            } else {
-                bitmap = BitmapFactory.decodeByteArray(it, 0, it.size)
-                if (bitmap == null) {
-                    true
-                } else {
-                    val orientation = ExifInterface(ByteArrayInputStream(it)).getAttributeInt(
-                        ExifInterface.TAG_ORIENTATION,
-                        ExifInterface.ORIENTATION_NORMAL
-                    )
-                    originalOrientation = when (orientation) {
-                        ExifInterface.ORIENTATION_ROTATE_90 -> 90f
-                        ExifInterface.ORIENTATION_ROTATE_180 -> 180f
-                        ExifInterface.ORIENTATION_ROTATE_270 -> 270f
-                        else -> 0f
-                    }
-                    val displayMetrics = Resources.getSystem().displayMetrics
-                    if (displayMetrics.widthPixels < bitmap!!.width || displayMetrics.heightPixels < bitmap!!.height) {
-                        val newWidth: Int
-                        val newHeight: Int
-                        if (displayMetrics.widthPixels > displayMetrics.heightPixels) {
-                            newWidth = displayMetrics.widthPixels
-                            newHeight = bitmap!!.height*displayMetrics.widthPixels/bitmap!!.width
-                        } else {
-                            newHeight = displayMetrics.heightPixels
-                            newWidth = bitmap!!.width*displayMetrics.heightPixels/bitmap!!.height
-                        }
-                        bitmap = Bitmap.createScaledBitmap(bitmap!!, newWidth, newHeight, false)
-                    }
-                    Glide.with(this).load(bitmap).transform(OrientationTransformation(originalOrientation)).into(binding.imageViewer)
-                    false
-                }
-            }
-            if (displayWithGlide) {
-                originalOrientation = 0f
+    private fun loadImage(newImage: Boolean) {
+        fileName = File(filePath).name
+        binding.textFilename.text = fileName
+        if (newImage || imageViewModel.imageBytes == null) {
+            loadWholeFile(filePath) {
+                imageViewModel.imageBytes = it
                 requestBuilder = Glide.with(this).load(it)
                 requestBuilder?.into(binding.imageViewer)
+                imageViewModel.rotationAngle = 0f
+            }
+        } else {
+            requestBuilder = Glide.with(this).load(imageViewModel.imageBytes)
+            if (imageViewModel.rotationAngle.mod(360f) != 0f) {
+                rotateImage()
+            } else {
+                requestBuilder?.into(binding.imageViewer)
             }
-            fileName = File(filePath).name
-            binding.textFilename.text = fileName
-            rotationAngle = originalOrientation
         }
     }
 
@@ -210,14 +192,20 @@ class ImageViewer: FileViewerActivity() {
         handler.postDelayed(hideUI, hideDelay)
     }
 
+    private fun onClickRotate(angle: Float) {
+        imageViewModel.rotationAngle += angle
+        binding.imageViewer.restoreZoomNormal()
+        rotateImage()
+    }
+
     private fun swipeImage(deltaX: Float, slideshowSwipe: Boolean = false){
         playlistNext(deltaX < 0)
-        loadImage()
-        if (slideshowActive){
+        loadImage(true)
+        if (slideshowActive) {
             if (!slideshowSwipe) { //reset slideshow delay if user swipes
                 handler.removeCallbacks(slideshowNext)
             }
-            handler.postDelayed(slideshowNext, ConstValues.SLIDESHOW_DELAY)
+            handler.postDelayed(slideshowNext, Constants.SLIDESHOW_DELAY)
         }
     }
 
@@ -227,14 +215,6 @@ class ImageViewer: FileViewerActivity() {
         Toast.makeText(this, R.string.slideshow_stopped, Toast.LENGTH_SHORT).show()
     }
 
-    override fun onBackPressed() {
-        if (slideshowActive){
-            stopSlideshow()
-        } else {
-            askSaveRotation { super.onBackPressed() }
-        }
-    }
-
     class OrientationTransformation(private val orientation: Float): BitmapTransformation() {
 
         lateinit var bitmap: Bitmap
@@ -252,15 +232,14 @@ class ImageViewer: FileViewerActivity() {
         }
     }
 
-    private fun rotateImage(){
-        binding.imageViewer.restoreZoomNormal()
-        orientationTransformation = OrientationTransformation(rotationAngle)
-        (requestBuilder ?: Glide.with(this).load(bitmap)).transform(orientationTransformation).into(binding.imageViewer)
+    private fun rotateImage() {
+        orientationTransformation = OrientationTransformation(imageViewModel.rotationAngle)
+        requestBuilder?.transform(orientationTransformation)?.into(binding.imageViewer)
     }
 
     private fun askSaveRotation(callback: () -> Unit){
-        if (rotationAngle.mod(360f) != originalOrientation && !slideshowActive) {
-            CustomAlertDialogBuilder(this, themeValue)
+        if (imageViewModel.rotationAngle.mod(360f) != 0f && !slideshowActive) {
+            CustomAlertDialogBuilder(this, theme)
                 .keepFullScreen()
                 .setTitle(R.string.warning)
                 .setMessage(R.string.ask_save_img_rotated)
@@ -273,13 +252,13 @@ class ImageViewer: FileViewerActivity() {
                                     Bitmap.CompressFormat.PNG
                                 } else {
                                     Bitmap.CompressFormat.JPEG
-                                }, 100, outputStream) == true
+                                }, 90, outputStream) == true
                         ){
                             if (encryptedVolume.importFile(ByteArrayInputStream(outputStream.toByteArray()), filePath)) {
                                 Toast.makeText(this, R.string.image_saved_successfully, Toast.LENGTH_SHORT).show()
                                 callback()
                             } else {
-                                CustomAlertDialogBuilder(this, themeValue)
+                                CustomAlertDialogBuilder(this, theme)
                                     .keepFullScreen()
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.file_write_failed)
@@ -287,7 +266,7 @@ class ImageViewer: FileViewerActivity() {
                                     .show()
                             }
                         } else {
-                            CustomAlertDialogBuilder(this, themeValue)
+                            CustomAlertDialogBuilder(this, theme)
                                 .keepFullScreen()
                                 .setTitle(R.string.error)
                                 .setMessage(R.string.bitmap_compress_failed)

app/src/main/java/sushi/hardcore/droidfs/file_viewers/MediaPlayer.kt

@@ -1,16 +1,22 @@
 package sushi.hardcore.droidfs.file_viewers
 
 import android.view.WindowManager
-import com.google.android.exoplayer2.*
-import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory
-import com.google.android.exoplayer2.source.MediaSource
-import com.google.android.exoplayer2.source.ProgressiveMediaSource
-import com.google.android.exoplayer2.video.VideoSize
-import sushi.hardcore.droidfs.ConstValues
+import androidx.annotation.OptIn
+import androidx.media3.common.MediaItem
+import androidx.media3.common.PlaybackException
+import androidx.media3.common.Player
+import androidx.media3.common.VideoSize
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.exoplayer.source.MediaSource
+import androidx.media3.exoplayer.source.ProgressiveMediaSource
+import androidx.media3.extractor.DefaultExtractorsFactory
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 
+@OptIn(UnstableApi::class)
 abstract class MediaPlayer: FileViewerActivity() {
     private lateinit var player: ExoPlayer
 
@@ -27,7 +33,7 @@ abstract class MediaPlayer: FileViewerActivity() {
     private fun createMediaSource(filePath: String): MediaSource {
         val dataSourceFactory = EncryptedVolumeDataSource.Factory(encryptedVolume, filePath)
         return ProgressiveMediaSource.Factory(dataSourceFactory, DefaultExtractorsFactory())
-            .createMediaSource(MediaItem.fromUri(ConstValues.FAKE_URI))
+            .createMediaSource(MediaItem.fromUri(Constants.FAKE_URI))
     }
 
     private fun initializePlayer(){
@@ -45,7 +51,7 @@ abstract class MediaPlayer: FileViewerActivity() {
                 onVideoSizeChanged(videoSize.width, videoSize.height)
             }
             override fun onPlayerError(error: PlaybackException) {
-                CustomAlertDialogBuilder(this@MediaPlayer, themeValue)
+                CustomAlertDialogBuilder(this@MediaPlayer, theme)
                         .setTitle(R.string.error)
                         .setMessage(getString(R.string.playing_failed, error.errorCodeName))
                         .setCancelable(false)
@@ -59,9 +65,10 @@ abstract class MediaPlayer: FileViewerActivity() {
                     window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
                 }
             }
-            override fun onPositionDiscontinuity(reason: Int) {
-                if (player.currentMediaItemIndex != currentPlaylistIndex) {
-                    playlistNext(player.currentMediaItemIndex == (currentPlaylistIndex+1) % mappedPlaylist.size)
+
+            override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
+                if (player.repeatMode != Player.REPEAT_MODE_ONE) {
+                    playlistNext(player.currentMediaItemIndex == (currentPlaylistIndex + 1) % mappedPlaylist.size)
                     refreshFileName()
                 }
             }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/PdfViewer.kt

@@ -7,11 +7,10 @@ import java.io.ByteArrayInputStream
 import java.io.File
 
 class PdfViewer: FileViewerActivity() {
-    private lateinit var pdfViewer: PdfViewer
-
-    override fun hideSystemUi() {
-        //don't hide system ui
+    init {
+        applyCustomTheme = false
     }
+    private lateinit var pdfViewer: PdfViewer
 
     override fun getFileType(): String {
         return "pdf"
@@ -22,12 +21,12 @@ class PdfViewer: FileViewerActivity() {
         val fileName = File(filePath).name
         title = fileName
         val fileSize = encryptedVolume.getAttr(filePath)?.size
-        loadWholeFile(filePath, fileSize)?.let {
+        loadWholeFile(filePath, fileSize) {
             pdfViewer.loadPdf(ByteArrayInputStream(it), fileName, fileSize)
         }
     }
 
-    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
         pdfViewer.onCreateOptionMenu(menu)
         return super.onCreateOptionsMenu(menu)
     }
@@ -37,7 +36,12 @@ class PdfViewer: FileViewerActivity() {
         pdfViewer.onResume()
     }
 
-    override fun onPrepareOptionsMenu(menu: Menu?): Boolean {
+    override fun onDestroy() {
+        super.onDestroy()
+        pdfViewer.onDestroy()
+    }
+
+    override fun onPrepareOptionsMenu(menu: Menu): Boolean {
         return pdfViewer.onPrepareOptionsMenu(menu)
     }
 

app/src/main/java/sushi/hardcore/droidfs/file_viewers/TextEditor.kt

@@ -7,10 +7,9 @@ import android.view.Menu
 import android.view.MenuItem
 import android.widget.EditText
 import android.widget.Toast
-import sushi.hardcore.droidfs.ConstValues
+import androidx.activity.addCallback
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
-import java.io.ByteArrayInputStream
 import java.io.File
 
 class TextEditor: FileViewerActivity() {
@@ -18,21 +17,23 @@ class TextEditor: FileViewerActivity() {
     private lateinit var editor: EditText
     private var changedSinceLastSave = false
     private var wordWrap = true
-    override fun hideSystemUi() {
-        //don't hide system ui
-    }
 
     override fun getFileType(): String {
         return "text"
     }
 
     override fun viewFile() {
-        loadWholeFile(filePath)?.let {
-            fileName = File(filePath).name
+        fileName = File(filePath).name
+        title = fileName
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+        loadWholeFile(filePath) {
             try {
                 loadLayout(String(it))
+                onBackPressedDispatcher.addCallback(this) {
+                    checkSaveAndExit()
+                }
             } catch (e: OutOfMemoryError){
-                CustomAlertDialogBuilder(this, themeValue)
+                CustomAlertDialogBuilder(this, theme)
                     .setTitle(R.string.error)
                     .setMessage(R.string.outofmemoryerror_msg)
                     .setCancelable(false)
@@ -47,8 +48,6 @@ class TextEditor: FileViewerActivity() {
         } else {
             setContentView(R.layout.activity_text_editor)
         }
-        title = fileName
-        supportActionBar?.setDisplayHomeAsUpEnabled(true)
         editor = findViewById(R.id.text_editor)
         editor.setText(fileContent)
         editor.addTextChangedListener(object: TextWatcher {
@@ -68,25 +67,14 @@ class TextEditor: FileViewerActivity() {
     private fun save(): Boolean{
         var success = false
         val content = editor.text.toString().toByteArray()
-        val fileHandle = encryptedVolume.openFile(filePath)
+        val fileHandle = encryptedVolume.openFileWriteMode(filePath)
         if (fileHandle != -1L) {
-            val buff = ByteArrayInputStream(content)
             var offset: Long = 0
-            val ioBuffer = ByteArray(ConstValues.IO_BUFF_SIZE)
-            var length: Int
-            while (buff.read(ioBuffer).also { length = it } > 0) {
-                val written = encryptedVolume.write(fileHandle, offset, ioBuffer, length).toLong()
-                if (written == length.toLong()) {
-                    offset += written
-                } else {
-                    break
-                }
-            }
+            while (offset < content.size && encryptedVolume.write(fileHandle, offset, content, offset, content.size.toLong()).also { offset += it } > 0) {}
             if (offset == content.size.toLong()){
                 success = encryptedVolume.truncate(filePath, offset)
             }
             encryptedVolume.closeFile(fileHandle)
-            buff.close()
         }
         if (success){
             Toast.makeText(this, getString(R.string.file_saved), Toast.LENGTH_SHORT).show()
@@ -98,7 +86,7 @@ class TextEditor: FileViewerActivity() {
 
     private fun checkSaveAndExit(){
         if (changedSinceLastSave){
-            CustomAlertDialogBuilder(this, themeValue)
+            CustomAlertDialogBuilder(this, theme)
                 .setTitle(R.string.warning)
                 .setMessage(R.string.ask_save)
                 .setPositiveButton(R.string.save) { _, _ ->
@@ -139,8 +127,4 @@ class TextEditor: FileViewerActivity() {
         }
         return true
     }
-
-    override fun onBackPressed() {
-        checkSaveAndExit()
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/file_viewers/VideoPlayer.kt

@@ -2,7 +2,9 @@ package sushi.hardcore.droidfs.file_viewers
 
 import android.content.pm.ActivityInfo
 import android.content.res.Configuration
-import com.google.android.exoplayer2.ExoPlayer
+import android.view.View
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.ui.PlayerView
 import sushi.hardcore.droidfs.databinding.ActivityVideoPlayerBinding
 
 class VideoPlayer: MediaPlayer() {
@@ -15,10 +17,16 @@ class VideoPlayer: MediaPlayer() {
     override fun viewFile() {
         binding = ActivityVideoPlayerBinding.inflate(layoutInflater)
         setContentView(binding.root)
+        applyNavigationBarMargin(binding.root)
         binding.videoPlayer.doubleTapOverlay = binding.doubleTapOverlay
-        binding.videoPlayer.setControllerVisibilityListener { visibility ->
+        binding.videoPlayer.setControllerVisibilityListener(PlayerView.ControllerVisibilityListener { visibility ->
             binding.topBar.visibility = visibility
-        }
+            if (visibility == View.VISIBLE) {
+                showPartialSystemUi()
+            } else {
+                hideSystemUi()
+            }
+        })
         binding.rotateButton.setOnClickListener {
             requestedOrientation =
                 if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {

app/src/main/java/sushi/hardcore/droidfs/filesystems/CryfsVolume.kt

@@ -1,8 +1,9 @@
 package sushi.hardcore.droidfs.filesystems
 
-import android.os.Parcel
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.util.ObjRef
 import sushi.hardcore.droidfs.util.PathUtils
 
 class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
@@ -16,14 +17,25 @@ class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
         private external fun nativeInit(
             baseDir: String,
             localStateDir: String,
-            password: ByteArray,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?,
             createBaseDir: Boolean,
-            cipher: String?
+            cipher: String?,
+            errorCode: ObjRef<Int?>,
         ): Long
+        private external fun nativeChangeEncryptionKey(
+            baseDir: String,
+            localStateDir: String,
+            currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ObjRef<ByteArray?>?
+        ): Boolean
         private external fun nativeCreate(fusePtr: Long, path: String, mode: Int): Long
         private external fun nativeOpen(fusePtr: Long, path: String, flags: Int): Long
-        private external fun nativeRead(fusePtr: Long, fileHandle: Long, buffer: ByteArray, offset: Long): Int
-        private external fun nativeWrite(fusePtr: Long, fileHandle: Long, offset: Long, buffer: ByteArray, size: Int): Int
+        private external fun nativeRead(fusePtr: Long, fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int
+        private external fun nativeWrite(fusePtr: Long, fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int
         private external fun nativeTruncate(fusePtr: Long, path: String, size: Long): Boolean
         private external fun nativeDeleteFile(fusePtr: Long, path: String): Boolean
         private external fun nativeCloseFile(fusePtr: Long, fileHandle: Long): Boolean
@@ -36,35 +48,63 @@ class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
         private external fun nativeIsClosed(fusePtr: Long): Boolean
 
         fun getLocalStateDir(filesDir: String): String {
-            return PathUtils.pathJoin(filesDir, ConstValues.CRYFS_LOCAL_STATE_DIR)
+            return PathUtils.pathJoin(filesDir, Constants.CRYFS_LOCAL_STATE_DIR)
         }
 
-        private fun init(baseDir: String, localStateDir: String, password: ByteArray, createBaseDir: Boolean, cipher: String?): CryfsVolume? {
-            val fusePtr = nativeInit(baseDir, localStateDir, password, createBaseDir, cipher)
-            return if (fusePtr == 0L) {
-                null
+        private fun init(
+            baseDir: String,
+            localStateDir: String,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?,
+            createBaseDir: Boolean,
+            cipher: String?
+        ): InitResult {
+            val errorCode = ObjRef<Int?>(null)
+            val fusePtr = nativeInit(baseDir, localStateDir, password, givenHash, returnedHash, createBaseDir, cipher, errorCode)
+            val result = InitResult.Builder()
+            if (fusePtr == 0L) {
+                result.errorCode = errorCode.value ?: 0
+                result.errorStringId = when (errorCode.value) {
+                    // Values from src/cryfs/impl/ErrorCodes.h
+                    11 -> {
+                        result.worthRetry = true
+                        R.string.wrong_password
+                    }
+                    16 -> R.string.inaccessible_base_dir
+                    19 -> R.string.config_load_error
+                    20 -> R.string.filesystem_id_changed
+                    else -> 0
+                }
             } else {
-                CryfsVolume(fusePtr)
+                result.volume = CryfsVolume(fusePtr)
             }
+            return result.build()
         }
 
-        fun create(baseDir: String, localStateDir: String, password: ByteArray, cipher: String?): Boolean {
-            return init(baseDir, localStateDir, password, true, cipher)?.also { it.close() } != null
+        fun create(baseDir: String, localStateDir: String, password: ByteArray, returnedHash: ObjRef<ByteArray?>?, cipher: String?): EncryptedVolume? {
+            return init(baseDir, localStateDir, password, null, returnedHash, true, cipher).volume
         }
 
-        fun init(baseDir: String, localStateDir: String, password: ByteArray): CryfsVolume? {
-            return init(baseDir, localStateDir, password, false, null)
+        fun init(baseDir: String, localStateDir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ObjRef<ByteArray?>?): InitResult {
+            return init(baseDir, localStateDir, password, givenHash, returnedHash, false, null)
+        }
+
+        fun changePassword(
+            baseDir: String, filesDir: String, currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ObjRef<ByteArray?>?
+        ): Boolean {
+            return nativeChangeEncryptionKey(baseDir, getLocalStateDir(filesDir), currentPassword, givenHash, newPassword, returnedHash)
         }
     }
 
-    constructor(parcel: Parcel) : this(parcel.readLong())
-
-    override fun writeToParcel(parcel: Parcel, flags: Int) = with(parcel) {
-        writeByte(CRYFS_VOLUME_TYPE)
-        writeLong(fusePtr)
+    override fun openFileReadMode(path: String): Long {
+        return nativeOpen(fusePtr, path, 0)
     }
 
-    override fun openFile(path: String): Long {
+    override fun openFileWriteMode(path: String): Long {
         val fileHandle = nativeOpen(fusePtr, path, 0)
         return if (fileHandle == -1L) {
             nativeCreate(fusePtr, path, 0)
@@ -73,12 +113,12 @@ class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
         }
     }
 
-    override fun read(fileHandle: Long, buffer: ByteArray, offset: Long): Int {
-        return nativeRead(fusePtr, fileHandle, buffer, offset)
+    override fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int {
+        return nativeRead(fusePtr, fileHandle, fileOffset, buffer, dstOffset, length)
     }
 
-    override fun write(fileHandle: Long, offset: Long, buffer: ByteArray, size: Int): Int {
-        return nativeWrite(fusePtr, fileHandle, offset, buffer, size)
+    override fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int {
+        return nativeWrite(fusePtr, fileHandle, fileOffset, buffer, srcOffset, length)
     }
 
     override fun truncate(path: String, size: Long): Boolean {

app/src/main/java/sushi/hardcore/droidfs/filesystems/EncryptedVolume.kt

@@ -2,34 +2,47 @@ package sushi.hardcore.droidfs.filesystems
 
 import android.content.Context
 import android.net.Uri
-import android.os.Parcel
-import android.os.Parcelable
-import sushi.hardcore.droidfs.ConstValues
-import sushi.hardcore.droidfs.SavedVolume
+import sushi.hardcore.droidfs.Constants
+import sushi.hardcore.droidfs.VolumeData
 import sushi.hardcore.droidfs.explorers.ExplorerElement
-import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.util.ObjRef
+import sushi.hardcore.droidfs.util.Observable
 import java.io.File
 import java.io.FileOutputStream
 import java.io.InputStream
 import java.io.OutputStream
 
-abstract class EncryptedVolume: Parcelable {
+abstract class EncryptedVolume: Observable<EncryptedVolume.Observer>() {
+
+    interface Observer {
+        fun onClose()
+    }
+
+    class InitResult(
+        val errorCode: Int,
+        val errorStringId: Int,
+        val worthRetry: Boolean,
+        val volume: EncryptedVolume?,
+    ) {
+        class Builder {
+            var errorCode = 0
+            var errorStringId = 0
+            var worthRetry = false
+            var volume: EncryptedVolume? = null
+
+            fun build() = InitResult(errorCode, errorStringId, worthRetry, volume)
+        }
+    }
+
     companion object {
         const val GOCRYPTFS_VOLUME_TYPE: Byte = 0
         const val CRYFS_VOLUME_TYPE: Byte = 1
 
-        @JvmField
-        val CREATOR = object : Parcelable.Creator<EncryptedVolume> {
-            override fun createFromParcel(parcel: Parcel): EncryptedVolume {
-                return when (parcel.readByte()) {
-                    GOCRYPTFS_VOLUME_TYPE -> GocryptfsVolume(parcel)
-                    CRYFS_VOLUME_TYPE -> CryfsVolume(parcel)
-                    else -> throw invalidVolumeType()
-                }
-            }
-            override fun newArray(size: Int) = arrayOfNulls<EncryptedVolume>(size)
-        }
-
+        /**
+         * Get the type of a volume.
+         *
+         * @return The volume type or -1 if the path is not recognized as a volume
+         */
         fun getVolumeType(path: String): Byte {
             return if (File(path, GocryptfsVolume.CONFIG_FILE_NAME).isFile) {
                 GOCRYPTFS_VOLUME_TYPE
@@ -40,13 +53,26 @@ abstract class EncryptedVolume: Parcelable {
             }
         }
 
-        fun init(volume: SavedVolume, filesDir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): EncryptedVolume? {
+        fun init(
+            volume: VolumeData,
+            filesDir: String,
+            password: ByteArray?,
+            givenHash: ByteArray?,
+            returnedHash: ObjRef<ByteArray?>?
+        ): InitResult {
             return when (volume.type) {
                 GOCRYPTFS_VOLUME_TYPE -> {
-                    GocryptfsVolume.init(volume.getFullPath(filesDir), password, givenHash, returnedHash)
+                    GocryptfsVolume.init(
+                        volume.getFullPath(filesDir),
+                        password,
+                        givenHash,
+                        returnedHash?.apply {
+                            value = ByteArray(GocryptfsVolume.KeyLen)
+                        }?.value
+                    )
                 }
                 CRYFS_VOLUME_TYPE -> {
-                    CryfsVolume.init(volume.getFullPath(filesDir), CryfsVolume.getLocalStateDir(filesDir), password!!)
+                    CryfsVolume.init(volume.getFullPath(filesDir), CryfsVolume.getLocalStateDir(filesDir), password, givenHash, returnedHash)
                 }
                 else -> throw invalidVolumeType()
             }
@@ -57,12 +83,12 @@ abstract class EncryptedVolume: Parcelable {
         }
     }
 
-    override fun describeContents() = 0
-
-    abstract fun openFile(path: String): Long
-    abstract fun read(fileHandle: Long, buffer: ByteArray, offset: Long): Int
-    abstract fun write(fileHandle: Long, offset: Long, buffer: ByteArray, size: Int): Int
+    abstract fun openFileReadMode(path: String): Long
+    abstract fun openFileWriteMode(path: String): Long
+    abstract fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int
+    abstract fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int
     abstract fun closeFile(fileHandle: Long): Boolean
+    // Due to gocryptfs internals, truncate requires the file to be open before it is called
     abstract fun truncate(path: String, size: Long): Boolean
     abstract fun deleteFile(path: String): Boolean
     abstract fun readDir(path: String): MutableList<ExplorerElement>?
@@ -70,18 +96,23 @@ abstract class EncryptedVolume: Parcelable {
     abstract fun rmdir(path: String): Boolean
     abstract fun getAttr(path: String): Stat?
     abstract fun rename(srcPath: String, dstPath: String): Boolean
-    abstract fun close()
+    protected abstract fun close()
     abstract fun isClosed(): Boolean
 
+    fun closeVolume() {
+        observers.forEach { it.onClose() }
+        close()
+    }
+
     fun pathExists(path: String): Boolean {
         return getAttr(path) != null
     }
 
     fun exportFile(fileHandle: Long, os: OutputStream): Boolean {
         var offset: Long = 0
-        val ioBuffer = ByteArray(ConstValues.IO_BUFF_SIZE)
+        val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
         var length: Int
-        while (read(fileHandle, ioBuffer, offset).also { length = it } > 0) {
+        while (read(fileHandle, offset, ioBuffer, 0, ioBuffer.size.toLong()).also { length = it } > 0) {
             os.write(ioBuffer, 0, length)
             offset += length.toLong()
         }
@@ -91,7 +122,7 @@ abstract class EncryptedVolume: Parcelable {
 
     fun exportFile(src_path: String, os: OutputStream): Boolean {
         var success = false
-        val srcfileHandle = openFile(src_path)
+        val srcfileHandle = openFileReadMode(src_path)
         if (srcfileHandle != -1L) {
             success = exportFile(srcfileHandle, os)
             closeFile(srcfileHandle)
@@ -112,22 +143,22 @@ abstract class EncryptedVolume: Parcelable {
     }
 
     fun importFile(inputStream: InputStream, dst_path: String): Boolean {
-        val dstfileHandle = openFile(dst_path)
+        val dstfileHandle = openFileWriteMode(dst_path)
         if (dstfileHandle != -1L) {
             var success = true
             var offset: Long = 0
-            val ioBuffer = ByteArray(ConstValues.IO_BUFF_SIZE)
-            var length: Int
-            while (inputStream.read(ioBuffer).also { length = it } > 0) {
-                val written = write(dstfileHandle, offset, ioBuffer, length).toLong()
-                if (written == length.toLong()) {
+            val ioBuffer = ByteArray(Constants.IO_BUFF_SIZE)
+            var length: Long
+            while (inputStream.read(ioBuffer).also { length = it.toLong() } > 0) {
+                val written = write(dstfileHandle, offset, ioBuffer, 0, length).toLong()
+                if (written == length) {
                     offset += written
                 } else {
-                    inputStream.close()
                     success = false
                     break
                 }
             }
+            truncate(dst_path, offset)
             closeFile(dstfileHandle)
             inputStream.close()
             return success
@@ -153,17 +184,12 @@ abstract class EncryptedVolume: Parcelable {
             }
             try {
                 val fileBuff = ByteArray(fileSize.toInt())
-                val fileHandle = openFile(fullPath)
+                val fileHandle = openFileReadMode(fullPath)
                 if (fileHandle == -1L) {
                     Pair(null, 3)
                 } else {
                     var offset: Long = 0
-                    val ioBuffer = ByteArray(ConstValues.IO_BUFF_SIZE)
-                    var length: Int
-                    while (read(fileHandle, ioBuffer, offset).also { length = it } > 0) {
-                        System.arraycopy(ioBuffer, 0, fileBuff, offset.toInt(), length)
-                        offset += length.toLong()
-                    }
+                    while (offset < fileSize && read(fileHandle, offset, fileBuff, offset, fileSize-offset).also { offset += it } > 0) {}
                     closeFile(fileHandle)
                     if (offset == fileBuff.size.toLong()) {
                         Pair(fileBuff, 0)
@@ -190,25 +216,4 @@ abstract class EncryptedVolume: Parcelable {
         }
         return result
     }
-
-    fun recursiveRemoveDirectory(path: String): String? {
-        readDir(path)?.let { elements ->
-            for (e in elements) {
-                val fullPath = PathUtils.pathJoin(path, e.name)
-                if (e.isDirectory) {
-                    val result = recursiveRemoveDirectory(fullPath)
-                    result?.let { return it }
-                } else {
-                    if (!deleteFile(fullPath)) {
-                        return fullPath
-                    }
-                }
-            }
-        }
-        return if (!rmdir(path)) {
-            path
-        } else {
-            null
-        }
-    }
 }

app/src/main/java/sushi/hardcore/droidfs/filesystems/GocryptfsVolume.kt

@@ -1,7 +1,10 @@
 package sushi.hardcore.droidfs.filesystems
 
-import android.os.Parcel
+import android.util.Log
+import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.explorers.ExplorerElement
+import sushi.hardcore.droidfs.util.ObjRef
+import kotlin.math.min
 
 class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
     private external fun native_close(sessionID: Int)
@@ -9,8 +12,8 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
     private external fun native_list_dir(sessionID: Int, dir_path: String): MutableList<ExplorerElement>?
     private external fun native_open_read_mode(sessionID: Int, file_path: String): Int
     private external fun native_open_write_mode(sessionID: Int, file_path: String, mode: Int): Int
-    private external fun native_read_file(sessionID: Int, handleID: Int, offset: Long, buff: ByteArray): Int
-    private external fun native_write_file(sessionID: Int, handleID: Int, offset: Long, buff: ByteArray, buff_size: Int): Int
+    private external fun native_read_file(sessionID: Int, handleID: Int, fileOffset: Long, buff: ByteArray, dstOffset: Long, length: Int): Int
+    private external fun native_write_file(sessionID: Int, handleID: Int, fileOffset: Long, buff: ByteArray, srcOffset: Long, length: Int): Int
     private external fun native_truncate(sessionID: Int, path: String, offset: Long): Boolean
     private external fun native_close_file(sessionID: Int, handleID: Int)
     private external fun native_remove_file(sessionID: Int, file_path: String): Boolean
@@ -21,34 +24,91 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
 
     companion object {
         const val KeyLen = 32
-        const val ScryptDefaultLogN = 16
+        private const val ScryptDefaultLogN = 16
+        private const val VOLUME_CREATOR = "DroidFS"
+        private const val MAX_KERNEL_WRITE = 128*1024
         const val CONFIG_FILE_NAME = "gocryptfs.conf"
-        external fun createVolume(root_cipher_dir: String, password: ByteArray, plainTextNames: Boolean, xchacha: Int, logN: Int, creator: String, returnedHash: ByteArray?): Boolean
+        private external fun nativeCreateVolume(
+            root_cipher_dir: String,
+            password: ByteArray,
+            plainTextNames: Boolean,
+            xchacha: Int,
+            logN: Int,
+            creator: String,
+            returnedHash: ByteArray?,
+        ): Int
         private external fun nativeInit(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): Int
-        external fun changePassword(root_cipher_dir: String, old_password: CharArray?, givenHash: ByteArray?, new_password: CharArray, returnedHash: ByteArray?): Boolean
+        external fun changePassword(
+            root_cipher_dir: String,
+            currentPassword: ByteArray?,
+            givenHash: ByteArray?,
+            newPassword: ByteArray,
+            returnedHash: ByteArray?
+        ): Boolean
 
-        fun init(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): GocryptfsVolume? {
-            val sessionId = nativeInit(root_cipher_dir, password, givenHash, returnedHash)
-            return if (sessionId == -1) {
-                null
-            } else {
-                GocryptfsVolume(sessionId)
+        fun createAndOpenVolume(
+            root_cipher_dir: String,
+            password: ByteArray,
+            plainTextNames: Boolean,
+            xchacha: Int,
+            returnedHash: ByteArray?,
+            volume: ObjRef<EncryptedVolume?>
+        ): Boolean {
+            return when (val result = nativeCreateVolume(
+                root_cipher_dir,
+                password,
+                plainTextNames,
+                xchacha,
+                ScryptDefaultLogN,
+                VOLUME_CREATOR,
+                returnedHash,
+            )) {
+                -1 -> {
+                    Log.e("gocryptfs", "Failed to open volume after creation")
+                    true
+                }
+                -2 -> false
+                else -> {
+                    volume.value = GocryptfsVolume(result)
+                    true
+                }
             }
         }
 
+        fun init(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): InitResult {
+            val sessionId = nativeInit(root_cipher_dir, password, givenHash, returnedHash)
+            val result = InitResult.Builder()
+            if (sessionId < 0) {
+                result.errorCode = sessionId
+                result.errorStringId = when (sessionId) {
+                    -1 -> R.string.config_load_error
+                    -2 -> {
+                        result.worthRetry = true
+                        R.string.wrong_password
+                    }
+                    else -> 0
+                }
+            } else {
+                result.volume = GocryptfsVolume(sessionId)
+            }
+            return result.build()
+        }
+
         init {
             System.loadLibrary("gocryptfs_jni")
         }
     }
 
-    constructor(parcel: Parcel) : this(parcel.readInt())
-
-    override fun openFile(path: String): Long {
-        return native_open_write_mode(sessionID, path, 0).toLong()
+    override fun openFileReadMode(path: String): Long {
+        return native_open_read_mode(sessionID, path).toLong()
     }
 
-    override fun read(fileHandle: Long, buffer: ByteArray, offset: Long): Int {
-        return native_read_file(sessionID, fileHandle.toInt(), offset, buffer)
+    override fun openFileWriteMode(path: String): Long {
+        return native_open_write_mode(sessionID, path, 384).toLong() // 0600
+    }
+
+    override fun read(fileHandle: Long, fileOffset: Long, buffer: ByteArray, dstOffset: Long, length: Long): Int {
+        return native_read_file(sessionID, fileHandle.toInt(), fileOffset, buffer, dstOffset, min(length.toInt(), MAX_KERNEL_WRITE))
     }
 
     override fun readDir(path: String): MutableList<ExplorerElement>? {
@@ -59,11 +119,6 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
         return native_get_attr(sessionID, path)
     }
 
-    override fun writeToParcel(parcel: Parcel, flags: Int) = with(parcel) {
-        writeByte(GOCRYPTFS_VOLUME_TYPE)
-        writeInt(sessionID)
-    }
-
     override fun close() {
         native_close(sessionID)
     }
@@ -73,7 +128,7 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
     }
 
     override fun mkdir(path: String): Boolean {
-        return native_mkdir(sessionID, path, 0)
+        return native_mkdir(sessionID, path, 448) // 0700
     }
 
     override fun rmdir(path: String): Boolean {
@@ -85,8 +140,8 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
         return true
     }
 
-    override fun write(fileHandle: Long, offset: Long, buffer: ByteArray, size: Int): Int {
-        return native_write_file(sessionID, fileHandle.toInt(), offset, buffer, size)
+    override fun write(fileHandle: Long, fileOffset: Long, buffer: ByteArray, srcOffset: Long, length: Long): Int {
+        return native_write_file(sessionID, fileHandle.toInt(), fileOffset, buffer, srcOffset, min(length.toInt(), MAX_KERNEL_WRITE))
     }
 
     override fun truncate(path: String, size: Long): Boolean {

app/src/main/java/sushi/hardcore/droidfs/filesystems/Stat.kt

@@ -1,14 +1,17 @@
 package sushi.hardcore.droidfs.filesystems
 
-class Stat(val type: Int, var size: Long, val mTime: Long) {
+class Stat(mode: Int, var size: Long, val mTime: Long) {
     companion object {
+        private const val S_IFMT = 0xF000
         const val S_IFDIR = 0x4000
         const val S_IFREG = 0x8000
         const val S_IFLNK = 0xA000
-        const val PARENT_FOLDER_TYPE = -1
+        const val PARENT_FOLDER_TYPE = 0xE000
 
         fun parentFolderStat(): Stat {
             return Stat(PARENT_FOLDER_TYPE, -1, -1)
         }
     }
+
+    val type = mode and S_IFMT
 }

app/src/main/java/sushi/hardcore/droidfs/util/AndroidUtils.kt

@@ -0,0 +1,110 @@
+package sushi.hardcore.droidfs.util
+
+import android.Manifest
+import android.app.Activity
+import android.app.ActivityManager
+import android.content.Context
+import android.content.SharedPreferences
+import android.content.pm.PackageManager
+import android.os.Build
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.preference.PreferenceManager
+import kotlin.reflect.KProperty
+
+object AndroidUtils {
+    fun isServiceRunning(context: Context, serviceClass: Class<*>): Boolean {
+        val manager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        @Suppress("DEPRECATION")
+        for (service in manager.getRunningServices(Int.MAX_VALUE)) {
+            if (serviceClass.name == service.service.className) {
+                return true
+            }
+        }
+        return false
+    }
+
+    /**
+     * A [Manifest.permission.POST_NOTIFICATIONS] permission helper.
+     *
+     * Must be initialized before [Activity.onCreate].
+     */
+    class NotificationPermissionHelper<out A: AppCompatActivity>(val activity: A) {
+        private var listener: ((Boolean) -> Unit)? = null
+        private val launcher = activity.registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
+            listener?.invoke(granted)
+            listener = null
+        }
+
+        /**
+         * Ask for notification permission if required and run the provided callback.
+         *
+         * The callback is run as soon as the user dismisses the permission dialog,
+         * no matter if the permission has been granted or not.
+         *
+         * If this function is called again before the user answered the dialog from the
+         * previous call, the previous callback won't be triggered.
+         *
+         * @param onDialogDismiss argument set to `true` if the permission is granted or
+         * not required, `false` otherwise
+         */
+        fun askAndRun(onDialogDismiss: (Boolean) -> Unit) {
+            assert(listener == null)
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+                if (ContextCompat.checkSelfPermission(activity, Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
+                    listener = onDialogDismiss
+                    launcher.launch(Manifest.permission.POST_NOTIFICATIONS)
+                    return
+                }
+            }
+            onDialogDismiss(true)
+        }
+    }
+
+    /**
+     * Property delegate mirroring the state of a boolean value in shared preferences.
+     *
+     * [init] **must** be called before accessing the delegated property.
+     */
+    class LiveBooleanPreference(
+        private val key: String,
+        private val defaultValue: Boolean = false,
+        private val onChange: ((value: Boolean) -> Unit)? = null
+    ) {
+        private lateinit var sharedPreferences: SharedPreferences
+        private var value = defaultValue
+        private val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
+            if (key == this.key) {
+                reload()
+                onChange?.invoke(value)
+            }
+        }
+
+        fun init(context: Context) = init(PreferenceManager.getDefaultSharedPreferences(context))
+
+        fun init(sharedPreferences: SharedPreferences) {
+            this.sharedPreferences = sharedPreferences
+            reload()
+            sharedPreferences.registerOnSharedPreferenceChangeListener(listener)
+        }
+
+        private fun reload() {
+            value = sharedPreferences.getBoolean(key, defaultValue)
+        }
+
+        operator fun getValue(thisRef: Any, property: KProperty<*>) = value
+
+        companion object {
+            fun init(context: Context, vararg liveBooleanPreferences: LiveBooleanPreference) {
+                init(PreferenceManager.getDefaultSharedPreferences(context), *liveBooleanPreferences)
+            }
+
+            fun init(sharedPreferences: SharedPreferences, vararg liveBooleanPreferences: LiveBooleanPreference) {
+                for (i in liveBooleanPreferences) {
+                    i.init(sharedPreferences)
+                }
+            }
+        }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/util/Compat.kt

@@ -0,0 +1,23 @@
+package sushi.hardcore.droidfs.util
+
+import android.os.Build
+import android.os.Bundle
+import android.os.Parcelable
+
+object Compat {
+    inline fun <reified T: Parcelable> getParcelable(bundle: Bundle, name: String): T? {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            bundle.getParcelable(name, T::class.java)
+        } else {
+            @Suppress("Deprecation")
+            bundle.getParcelable(name)
+        }
+    }
+
+   val MEMFD_CREATE_MINIMUM_KERNEL_VERSION = Version("3.17")
+
+    fun isMemFileSupported(): Boolean {
+        val kernel = System.getProperty("os.version") ?: return false
+        return Version(kernel) >= MEMFD_CREATE_MINIMUM_KERNEL_VERSION
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/util/IntentUtils.kt

@@ -0,0 +1,21 @@
+package sushi.hardcore.droidfs.util
+
+import android.content.Intent
+import android.os.Build
+import android.os.Parcelable
+
+object IntentUtils {
+    inline fun <reified T: Parcelable> getParcelableExtra(intent: Intent, name: String): T? {
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            intent.getParcelableExtra(name, T::class.java)
+        } else {
+            @Suppress("Deprecation")
+            intent.getParcelableExtra(name)
+        }
+    }
+
+    fun forwardIntent(sourceIntent: Intent, targetIntent: Intent) {
+        targetIntent.action = sourceIntent.action
+        sourceIntent.extras?.let { targetIntent.putExtras(it) }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/util/ObjRef.kt

@@ -0,0 +1,3 @@
+package sushi.hardcore.droidfs.util
+
+class ObjRef<T>(var value: T)

app/src/main/java/sushi/hardcore/droidfs/util/Observable.kt

@@ -0,0 +1,21 @@
+package sushi.hardcore.droidfs.util
+
+import android.app.Activity
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+
+abstract class Observable<T> {
+    protected val observers = mutableListOf<T>()
+
+    fun observe(observer: T) {
+        observers.add(observer)
+    }
+}
+
+fun Activity.finishOnClose(encryptedVolume: EncryptedVolume) {
+    encryptedVolume.observe(object : EncryptedVolume.Observer {
+        override fun onClose() {
+            finish()
+            // no need to remove observer as the EncryptedVolume will be destroyed
+        }
+    })
+}

app/src/main/java/sushi/hardcore/droidfs/util/PathUtils.kt

@@ -3,12 +3,16 @@ package sushi.hardcore.droidfs.util
 import android.content.ActivityNotFoundException
 import android.content.Context
 import android.net.Uri
+import android.os.Build
+import android.os.Environment
 import android.os.storage.StorageManager
 import android.provider.DocumentsContract
 import android.provider.OpenableColumns
+import android.util.Log
 import androidx.activity.result.ActivityResultLauncher
 import androidx.core.content.ContextCompat
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.Theme
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
 import java.text.DecimalFormat
@@ -18,6 +22,7 @@ import kotlin.math.pow
 
 object PathUtils {
     const val SEPARATOR = '/'
+    const val PATH_RESOLVER_TAG = "PATH RESOLVER"
 
     fun getParentPath(path: String): String {
         val strippedPath = if (path.endsWith(SEPARATOR)) {
@@ -95,11 +100,47 @@ object PathUtils {
         return "Android/data/${context.packageName}/"
     }
 
-    private fun getExternalStoragePath(context: Context): List<String> {
+    private fun getExternalStoragePath(context: Context, name: String): String? {
+        for (dir in ContextCompat.getExternalFilesDirs(context, null)) {
+            Log.d(PATH_RESOLVER_TAG, "External dir: $dir")
+            if (Environment.isExternalStorageRemovable(dir)) {
+                Log.d(PATH_RESOLVER_TAG, "isExternalStorageRemovable")
+                val path = dir.path.split("/Android")[0]
+                if (File(path).name == name) {
+                    return path
+                }
+            }
+        }
+        Log.d(PATH_RESOLVER_TAG, "getExternalFilesDirs failed")
+        // Don't risk to be killed by SELinux on newer Android versions
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.Q) {
+            try {
+                val process = ProcessBuilder("mount").redirectErrorStream(true).start().apply { waitFor() }
+                process.inputStream.readBytes().decodeToString().split("\n").forEach { line ->
+                    if (line.startsWith("/dev/block/vold")) {
+                        Log.d(PATH_RESOLVER_TAG, "mount: $line")
+                        val fields = line.split(" ")
+                        if (fields.size >= 3) {
+                            val path = fields[2]
+                            if (File(path).name == name) {
+                                return path
+                            }
+                        }
+                    }
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+            Log.d(PATH_RESOLVER_TAG, "mount processing failed")
+        }
+        return null
+    }
+
+    private fun getExternalStoragesPaths(context: Context): List<String> {
         val externalPaths: MutableList<String> = ArrayList()
         ContextCompat.getExternalFilesDirs(context, null).forEach {
-            val rootPath = it.path.substring(0, it.path.indexOf(getPackageDataFolder(context)+"files"))
-            if (!rootPath.endsWith("/0/")){ //not primary storage
+            if (Environment.isExternalStorageRemovable(it)) {
+                val rootPath = it.path.substring(0, it.path.indexOf(getPackageDataFolder(context)+"files"))
                 externalPaths.add(rootPath)
             }
         }
@@ -107,7 +148,7 @@ object PathUtils {
     }
 
     fun isPathOnExternalStorage(path: String, context: Context): Boolean {
-        getExternalStoragePath(context).forEach {
+        getExternalStoragesPaths(context).forEach {
             if (path.startsWith(it)){
                 return true
             }
@@ -116,18 +157,23 @@ object PathUtils {
     }
 
     private const val PRIMARY_VOLUME_NAME = "primary"
-    fun getFullPathFromTreeUri(treeUri: Uri?, context: Context): String? {
-        if (treeUri == null) return null
+    fun getFullPathFromTreeUri(treeUri: Uri, context: Context): String? {
         if ("content".equals(treeUri.scheme, ignoreCase = true)) {
             val vId = getVolumeIdFromTreeUri(treeUri)
-            var volumePath = getVolumePath(vId, context) ?: return null
-            if (volumePath.endsWith(File.separator))
-                volumePath = volumePath.substring(0, volumePath.length - 1)
-            var documentPath = getDocumentPathFromTreeUri(treeUri)
-            if (documentPath!!.endsWith(File.separator))
-                documentPath = documentPath.substring(0, documentPath.length - 1)
+            Log.d(PATH_RESOLVER_TAG, "Volume Id: $vId")
+            var volumePath = getVolumePath(vId ?: return null, context)
+            Log.d(PATH_RESOLVER_TAG, "Volume Path: $volumePath")
+            if (volumePath == null) {
+                volumePath = if (vId == "primary") {
+                    Environment.getExternalStorageDirectory().path
+                } else {
+                    getExternalStoragePath(context, vId) ?: "/storage/$vId"
+                }
+            }
+            val documentPath = getDocumentPathFromTreeUri(treeUri)!!
+            Log.d(PATH_RESOLVER_TAG, "Document Path: $documentPath")
             return if (documentPath.isNotEmpty()) {
-                pathJoin(volumePath, documentPath)
+                pathJoin(volumePath!!, documentPath)
             } else volumePath
         } else if ("file".equals(treeUri.scheme, ignoreCase = true)) {
             return treeUri.path
@@ -135,7 +181,7 @@ object PathUtils {
         return null
     }
 
-    private fun getVolumePath(volumeId: String?, context: Context): String? {
+    private fun getVolumePath(volumeId: String, context: Context): String? {
         return try {
             val mStorageManager = context.getSystemService(Context.STORAGE_SERVICE) as StorageManager
             val storageVolumeClazz = Class.forName("android.os.storage.StorageVolume")
@@ -185,11 +231,11 @@ object PathUtils {
         return rootDirectory.delete()
     }
 
-     fun safePickDirectory(directoryPicker: ActivityResultLauncher<Uri>, context: Context, themeValue: String) {
+     fun safePickDirectory(directoryPicker: ActivityResultLauncher<Uri?>, context: Context, theme: Theme) {
         try {
             directoryPicker.launch(null)
         } catch (e: ActivityNotFoundException) {
-            CustomAlertDialogBuilder(context, themeValue)
+            CustomAlertDialogBuilder(context, theme)
                 .setTitle(R.string.error)
                 .setMessage(R.string.open_tree_failed)
                 .setPositiveButton(R.string.ok, null)

app/src/main/java/sushi/hardcore/droidfs/util/UIUtils.kt

@@ -0,0 +1,42 @@
+package sushi.hardcore.droidfs.util
+
+import android.content.Context
+import android.view.Menu
+import android.widget.EditText
+import androidx.core.content.ContextCompat
+import sushi.hardcore.droidfs.R
+import java.nio.CharBuffer
+import java.nio.charset.StandardCharsets
+import java.util.*
+
+object UIUtils {
+    fun encodeEditTextContent(editText: EditText): ByteArray {
+        val charArray = CharArray(editText.text.length)
+        editText.text.getChars(0, editText.text.length, charArray, 0)
+        val byteBuffer = StandardCharsets.UTF_8.encode(CharBuffer.wrap(charArray))
+        Arrays.fill(charArray, Char.MIN_VALUE)
+        val byteArray = ByteArray(byteBuffer.remaining())
+        byteBuffer.get(byteArray)
+        Wiper.wipe(byteBuffer)
+        return byteArray
+    }
+
+    class MenuIconColor(
+        private val context: Context,
+        private val menu: Menu,
+        private val color: Int
+    ) {
+        fun applyTo(menuItemId: Int, drawableId: Int) {
+            menu.findItem(menuItemId)?.let {
+                it.icon = ContextCompat.getDrawable(context, drawableId)?.apply {
+                    setTint(color)
+                }
+            }
+        }
+    }
+
+    fun getMenuIconNeutralTint(context: Context, menu: Menu) = MenuIconColor(
+        context, menu,
+        ContextCompat.getColor(context, R.color.neutralIconTint),
+    )
+}

app/src/main/java/sushi/hardcore/droidfs/util/Version.kt

@@ -0,0 +1,29 @@
+package sushi.hardcore.droidfs.util
+
+import java.lang.Integer.max
+
+class Version(inputVersion: String) : Comparable<Version> {
+    private val version: String
+
+    init {
+        val regex = "[0-9]+(\\.[0-9]+)*".toRegex()
+        val match = regex.find(inputVersion) ?: throw IllegalArgumentException("Invalid version format")
+        version = match.value
+    }
+
+    fun split() = version.split(".").toTypedArray()
+
+    override fun compareTo(other: Version) =
+        (split() to other.split()).let { (split, otherSplit) ->
+            val length = max(split.size, otherSplit.size)
+            for (i in 0 until length) {
+                val part = if (i < split.size) split[i].toInt() else 0
+                val otherPart = if (i < otherSplit.size) otherSplit[i].toInt() else 0
+                if (part < otherPart) return -1
+                if (part > otherPart) return 1
+            }
+            0
+        }
+
+    override fun toString() = version
+}

app/src/main/java/sushi/hardcore/droidfs/util/WidgetUtil.kt

@@ -1,18 +0,0 @@
-package sushi.hardcore.droidfs.util
-
-import android.widget.EditText
-import java.nio.CharBuffer
-import java.nio.charset.StandardCharsets
-import java.util.*
-
-object WidgetUtil {
-    fun encodeEditTextContent(editText: EditText): ByteArray {
-        val charArray = CharArray(editText.text.length)
-        editText.text.getChars(0, editText.text.length, charArray, 0)
-        val byteArray = StandardCharsets.UTF_8.encode(
-            CharBuffer.wrap(charArray)
-        ).array()
-        Arrays.fill(charArray, Char.MIN_VALUE)
-        return byteArray
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/util/Wiper.kt

@@ -4,14 +4,25 @@ import android.content.Context
 import android.net.Uri
 import android.provider.OpenableColumns
 import androidx.documentfile.provider.DocumentFile
-import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 import java.io.File
 import java.io.FileOutputStream
+import java.nio.ByteBuffer
 import java.util.*
 import kotlin.math.ceil
 
 object Wiper {
+    fun wipe(byteBuffer: ByteBuffer) {
+        if (byteBuffer.hasArray()) {
+            Arrays.fill(byteBuffer.array(), Byte.MIN_VALUE)
+        } else {
+            for (i in 0 until byteBuffer.limit()) {
+                byteBuffer.put(i, Byte.MIN_VALUE)
+            }
+        }
+    }
+
     private const val buff_size = 4096
     fun wipe(context: Context, uri: Uri): String? {
         val cursor = context.contentResolver.query(uri, null, null, null, null)
@@ -25,11 +36,11 @@ object Wiper {
                 val buff = ByteArray(buff_size)
                 Arrays.fill(buff, 0.toByte())
                 val writes = ceil(size.toDouble() / buff_size).toInt()
-                for (i in 0 until ConstValues.WIPE_PASSES) {
+                for (i in 0 until Constants.WIPE_PASSES) {
                     for (j in 0 until writes) {
                         os.write(buff)
                     }
-                    if (i < ConstValues.WIPE_PASSES - 1) {
+                    if (i < Constants.WIPE_PASSES - 1) {
                         //reopening to flush and seek
                         os.close()
                         os = context.contentResolver.openOutputStream(uri)!!
@@ -57,11 +68,11 @@ object Wiper {
             val buff = ByteArray(buff_size)
             Arrays.fill(buff, 0.toByte())
             val writes = ceil(size.toDouble() / buff_size).toInt()
-            for (i in 0 until ConstValues.WIPE_PASSES) {
+            for (i in 0 until Constants.WIPE_PASSES) {
                 for (j in 0 until writes) {
                     os.write(buff)
                 }
-                if (i < ConstValues.WIPE_PASSES - 1) {
+                if (i < Constants.WIPE_PASSES - 1) {
                     //reopening to flush and seek
                     os.close()
                     os = FileOutputStream(file)

app/src/main/java/sushi/hardcore/droidfs/video_recording/AsynchronousSeekableWriter.kt

@@ -0,0 +1,68 @@
+package sushi.hardcore.droidfs.video_recording
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.launch
+import sushi.hardcore.droidfs.Constants
+import java.nio.ByteBuffer
+
+class AsynchronousSeekableWriter(private val internalWriter: SeekableWriter): SeekableWriter {
+
+    internal enum class Operation { WRITE, SEEK, CLOSE }
+
+    internal class Task(
+        val operation: Operation,
+        val buffer: ByteArray? = null,
+        val offset: Long? = null,
+    )
+
+    private val channel = Channel<Task>(Channel.UNLIMITED)
+
+    private fun flush(buffer: ByteBuffer) {
+        internalWriter.write(buffer.array(), buffer.position())
+        buffer.position(0)
+    }
+
+    fun start() {
+        CoroutineScope(Dispatchers.IO).launch {
+            val buffer = ByteBuffer.allocate(Constants.IO_BUFF_SIZE)
+            while (true) {
+                val task = channel.receive()
+                when (task.operation) {
+                    Operation.WRITE -> {
+                        if (task.buffer!!.size > buffer.remaining()) {
+                            flush(buffer)
+                        }
+                        buffer.put(task.buffer)
+                    }
+                    Operation.SEEK -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.seek(task.offset!!)
+                    }
+                    Operation.CLOSE -> {
+                        if (buffer.position() > 0) {
+                            flush(buffer)
+                        }
+                        internalWriter.close()
+                        break
+                    }
+                }
+            }
+        }
+    }
+
+    override fun write(buffer: ByteArray, size: Int) {
+        channel.trySend(Task(Operation.WRITE, buffer)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun seek(offset: Long) {
+        channel.trySend(Task(Operation.SEEK, offset = offset)).exceptionOrNull()?.let { throw it }
+    }
+
+    override fun close() {
+        channel.trySend(Task(Operation.CLOSE)).exceptionOrNull()?.let { throw it }
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/FFmpegMuxer.kt

@@ -0,0 +1,91 @@
+package sushi.hardcore.droidfs.video_recording
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import androidx.camera.video.MediaMuxer
+import java.nio.ByteBuffer
+
+class FFmpegMuxer(val writer: SeekableWriter): MediaMuxer {
+    external fun allocContext(): Long
+    external fun addVideoTrack(formatContext: Long, bitrate: Int, frameRate: Int, width: Int, height: Int, orientationHint: Int): Int
+    external fun addAudioTrack(formatContext: Long, bitrate: Int, sampleRate: Int, channelCount: Int): Int
+    external fun writeHeaders(formatContext: Long): Int
+    external fun writePacket(formatContext: Long, buffer: ByteArray, pts: Long, streamIndex: Int, isKeyFrame: Boolean)
+    external fun writeTrailer(formatContext: Long)
+    external fun release(formatContext: Long)
+
+    var formatContext: Long?
+
+    var orientation = 0
+    private var videoTrackIndex: Int? = null
+    private var audioTrackIndex: Int? = null
+    private var firstPts: Long? = null
+
+    init {
+        System.loadLibrary("mux")
+        formatContext = allocContext()
+    }
+
+    override fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo) {
+        val byteArray = ByteArray(bufferInfo.size)
+        buffer.get(byteArray)
+        if (firstPts == null) {
+            firstPts = bufferInfo.presentationTimeUs
+        }
+        writePacket(
+            formatContext!!, byteArray, bufferInfo.presentationTimeUs - firstPts!!, trackIndex,
+            bufferInfo.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0
+        )
+    }
+
+    override fun addTrack(mediaFormat: MediaFormat): Int {
+        val mime = mediaFormat.getString("mime")!!.split('/')
+        val bitrate = mediaFormat.getInteger("bitrate")
+        return if (mime[0] == "audio") {
+            addAudioTrack(
+                formatContext!!,
+                bitrate,
+                mediaFormat.getInteger("sample-rate"),
+                mediaFormat.getInteger("channel-count")
+            ).also {
+                audioTrackIndex = it
+            }
+        } else {
+            addVideoTrack(
+                formatContext!!,
+                bitrate,
+                mediaFormat.getInteger("frame-rate"),
+                mediaFormat.getInteger("width"),
+                mediaFormat.getInteger("height"),
+                orientation
+            ).also {
+               videoTrackIndex = it
+            }
+        }
+    }
+
+    override fun start() {
+        writeHeaders(formatContext!!)
+    }
+    override fun stop() {
+        writeTrailer(formatContext!!)
+    }
+
+    override fun setOrientationHint(degree: Int) {
+        orientation = degree
+    }
+
+    override fun release() {
+        writer.close()
+        release(formatContext!!)
+        firstPts = null
+        formatContext = null
+    }
+
+    fun writePacket(buff: ByteArray) {
+        writer.write(buff, buff.size)
+    }
+    fun seek(offset: Long) {
+        writer.seek(offset)
+    }
+}

app/src/main/java/sushi/hardcore/droidfs/video_recording/MediaMuxer.kt

@@ -1,94 +0,0 @@
-package sushi.hardcore.droidfs.video_recording
-
-import android.media.MediaCodec
-import android.media.MediaFormat
-import java.nio.ByteBuffer
-
-class MediaMuxer(val writer: SeekableWriter) {
-    external fun allocContext(): Long
-    external fun addVideoTrack(formatContext: Long, bitrate: Int, width: Int, height: Int, orientationHint: Int): Int
-    external fun addAudioTrack(formatContext: Long, bitrate: Int, sampleRate: Int, channelCount: Int): Int
-    external fun writeHeaders(formatContext: Long): Int
-    external fun writePacket(formatContext: Long, buffer: ByteArray, pts: Long, streamIndex: Int, isKeyFrame: Boolean)
-    external fun writeTrailer(formatContext: Long)
-    external fun release(formatContext: Long)
-
-    companion object {
-        const val VIDEO_TRACK_INDEX = 0
-        const val AUDIO_TRACK_INDEX = 1
-    }
-
-    var formatContext: Long?
-
-    var orientationHint = 0
-    var realVideoTrackIndex: Int? = null
-    var audioFrameSize: Int? = null
-    var firstPts: Long? = null
-    private var audioPts = 0L
-
-    init {
-        System.loadLibrary("mux")
-        formatContext = allocContext()
-    }
-
-    fun writeSampleData(trackIndex: Int, buffer: ByteBuffer, bufferInfo: MediaCodec.BufferInfo) {
-        val byteArray = ByteArray(bufferInfo.size)
-        buffer.get(byteArray)
-        if (firstPts == null) {
-            firstPts = bufferInfo.presentationTimeUs
-        }
-        if (trackIndex == AUDIO_TRACK_INDEX) {
-            writePacket(formatContext!!, byteArray, audioPts, -1, false)
-            audioPts += audioFrameSize!!
-        } else {
-            writePacket(
-                formatContext!!, byteArray, bufferInfo.presentationTimeUs - firstPts!!, realVideoTrackIndex!!,
-                bufferInfo.flags and MediaCodec.BUFFER_FLAG_KEY_FRAME != 0
-            )
-        }
-    }
-
-    fun addTrack(format: MediaFormat): Int {
-        val mime = format.getString("mime")!!.split('/')
-        val bitrate = format.getInteger("bitrate")
-        return if (mime[0] == "audio") {
-            audioFrameSize = addAudioTrack(
-                formatContext!!,
-                bitrate,
-                format.getInteger("sample-rate"),
-                format.getInteger("channel-count")
-            )
-            AUDIO_TRACK_INDEX
-        } else {
-            realVideoTrackIndex = addVideoTrack(
-                formatContext!!,
-                bitrate,
-                format.getInteger("width"),
-                format.getInteger("height"),
-                orientationHint
-            )
-            VIDEO_TRACK_INDEX
-        }
-    }
-
-    fun start() {
-        writeHeaders(formatContext!!)
-    }
-    fun stop() {
-        writeTrailer(formatContext!!)
-    }
-    fun release() {
-        writer.close()
-        release(formatContext!!)
-        firstPts = null
-        audioPts = 0
-        formatContext = null
-    }
-
-    fun writePacket(buff: ByteArray) {
-        writer.write(buff)
-    }
-    fun seek(offset: Long) {
-        writer.seek(offset)
-    }
-}

app/src/main/java/sushi/hardcore/droidfs/video_recording/SeekableWriter.kt

@@ -1,7 +1,7 @@
 package sushi.hardcore.droidfs.video_recording
 
 interface SeekableWriter {
-    fun write(byteArray: ByteArray)
+    fun write(buffer: ByteArray, size: Int)
     fun seek(offset: Long)
     fun close()
 }