Multi volume openings

app/build.gradle

@@ -88,9 +88,11 @@ dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.9.0'
-    implementation "androidx.appcompat:appcompat:1.6.0"
+    implementation "androidx.appcompat:appcompat:1.6.1"
     implementation "androidx.constraintlayout:constraintlayout:2.1.4"
-    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1"
+    def lifecycle_version = "2.5.1"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-process:$lifecycle_version"
 
     implementation "androidx.sqlite:sqlite-ktx:2.3.0"
     implementation "androidx.preference:preference-ktx:1.2.0"

app/src/main/AndroidManifest.xml

@@ -30,7 +30,8 @@
         android:label="@string/app_name"
         android:requestLegacyExternalStorage="true"
         android:supportsRtl="true"
-        android:theme="@style/BaseTheme">
+        android:theme="@style/BaseTheme"
+        android:name=".VolumeManagerApp">
         <activity android:name=".MainActivity" android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

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

@@ -4,7 +4,6 @@ import android.content.SharedPreferences
 import android.os.Bundle
 import android.view.WindowManager
 import androidx.appcompat.app.AppCompatActivity
-import androidx.preference.PreferenceManager
 
 open class BaseActivity: AppCompatActivity() {
     protected lateinit var sharedPrefs: SharedPreferences
@@ -13,7 +12,7 @@ open class BaseActivity: AppCompatActivity() {
     private var shouldCheckTheme = true
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this)
+        sharedPrefs = (application as VolumeManagerApp).sharedPreferences
         themeValue = sharedPrefs.getString(Constants.THEME_VALUE_KEY, Constants.DEFAULT_THEME_VALUE)!!
         if (shouldCheckTheme && applyCustomTheme) {
             when (themeValue) {

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

@@ -17,7 +17,6 @@ import android.view.animation.RotateAnimation
 import android.widget.ImageView
 import android.widget.RelativeLayout
 import android.widget.Toast
-import androidx.activity.addCallback
 import androidx.annotation.RequiresApi
 import androidx.camera.camera2.interop.Camera2CameraInfo
 import androidx.camera.core.*
@@ -29,7 +28,6 @@ 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.IntentUtils
@@ -63,14 +61,11 @@ 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 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
@@ -92,7 +87,6 @@ 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()
@@ -103,7 +97,6 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
             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 {
@@ -220,7 +213,6 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 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)
                     }
                 }
@@ -280,17 +272,11 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                 else -> false
             }
         }
-        onBackPressedDispatcher.addCallback(this) {
-            isFinishingIntentionally = true
-            isEnabled = false
-            onBackPressedDispatcher.onBackPressed()
-        }
     }
 
     @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) {
@@ -301,10 +287,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                         .setTitle(R.string.error)
                         .setMessage(R.string.camera_perm_needed)
                         .setCancelable(false)
-                        .setPositiveButton(R.string.ok) { _, _ ->
+                        .setPositiveButton(R.string.ok) { _, _ -> finish() }.show()
-                            isFinishingIntentionally = true
-                            finish()
-                        }.show()
                 }
                 AUDIO_PERMISSION_REQUEST_CODE -> if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     if (videoCapture != null) {
@@ -431,10 +414,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
                                     .setTitle(R.string.error)
                                     .setMessage(R.string.picture_save_failed)
                                     .setCancelable(false)
-                                    .setPositiveButton(R.string.ok) { _, _ ->
+                                    .setPositiveButton(R.string.ok) { _, _ -> finish() }
-                                        isFinishingIntentionally = true
-                                        finish()
-                                    }
                                     .show()
                             }
                         }
@@ -485,33 +465,19 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         }
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        if (!isFinishingIntentionally) {
-            encryptedVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
-
-    override fun onStop() {
-        super.onStop()
-        if (!isFinishing && !usf_keep_open){
-            finish()
-        }
-    }
-
     override fun onPause() {
         super.onPause()
         sensorOrientationListener.remove(this)
-        if (!isAskingPermissions && !usf_keep_open) {
-            finish()
-        }
     }
 
     override fun onResume() {
         super.onResume()
+        if (encryptedVolume.isClosed()) {
+            finish()
+        } else {
             sensorOrientationListener.addListener(this)
         }
+    }
 
     override fun onOrientationChange(newOrientation: Int) {
         val realOrientation = when (newOrientation) {

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

@@ -20,12 +20,10 @@ 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.databinding.ActivityMainBinding
 import sushi.hardcore.droidfs.databinding.DialogDeleteVolumeBinding
 import sushi.hardcore.droidfs.explorers.ExplorerRouter
 import sushi.hardcore.droidfs.file_operations.FileOperationService
-import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
@@ -33,11 +31,15 @@ import sushi.hardcore.droidfs.widgets.EditTextDialog
 import java.io.File
 
 class MainActivity : BaseActivity(), VolumeAdapter.Listener {
+    companion object {
+        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 lateinit var volumeOpener: VolumeOpener
-    private var usfKeepOpen: Boolean = false
     private var addVolume = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
         if ((explorerRouter.pickMode || explorerRouter.dropMode) && result.resultCode != AddVolumeActivity.RESULT_USER_BACK) {
             setResult(result.resultCode, result.data) // forward result
@@ -54,7 +56,6 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
     }
     private lateinit var fileOperationService: FileOperationService
     private lateinit var explorerRouter: ExplorerRouter
-    private var shouldCloseVolume = true // used when launched to pick file from another volume
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -80,10 +81,12 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 .show()
         }
         explorerRouter = ExplorerRouter(this, intent)
+        volumeManager = (application as VolumeManagerApp).volumeManager
         volumeDatabase = VolumeDatabase(this)
         volumeAdapter = VolumeAdapter(
             this,
             volumeDatabase,
+            (application as VolumeManagerApp).volumeManager,
             !explorerRouter.pickMode && !explorerRouter.dropMode,
             !explorerRouter.dropMode,
             this,
@@ -100,30 +103,31 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
             addVolume.launch(Intent(this, AddVolumeActivity::class.java).also {
                 if (explorerRouter.dropMode || explorerRouter.pickMode) {
                     IntentUtils.forwardIntent(intent, it)
-                    shouldCloseVolume = false
                 }
             })
         }
-        usfKeepOpen = sharedPrefs.getBoolean("usf_keep_open", false)
         volumeOpener = VolumeOpener(this)
-        volumeOpener.defaultVolumeName?.let { name ->
-            try {
-                openVolume(volumeAdapter.volumes.first { it.name == name })
-            } catch (e: NoSuchElementException) {
-                unsetDefaultVolume()
-            }
-        }
         onBackPressedDispatcher.addCallback(this) {
             if (volumeAdapter.selectedItems.isNotEmpty()) {
                 unselectAll()
             } else {
-                if (explorerRouter.pickMode) {
-                    shouldCloseVolume = false
-                }
                 isEnabled = false
                 onBackPressedDispatcher.onBackPressed()
             }
         }
+        volumeOpener.defaultVolumeName?.let { name ->
+            val state = savedInstanceState?.getBoolean(OPEN_DEFAULT_VOLUME)
+            if (state == true || state == null) {
+                val volumeData = volumeAdapter.volumes.first { it.name == name }
+                if (!volumeManager.isOpen(volumeData)) {
+                    try {
+                        openVolume(volumeData)
+                    } catch (e: NoSuchElementException) {
+                        unsetDefaultVolume()
+                    }
+                }
+            }
+        }
         Intent(this, FileOperationService::class.java).also {
             bindService(it, object : ServiceConnection {
                 override fun onServiceConnected(className: ComponentName, service: IBinder) {
@@ -148,6 +152,11 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         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) {
         title = if (size == 0) {
             getString(R.string.app_name)
@@ -179,6 +188,11 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         invalidateOptionsMenu()
     }
 
+    private fun removeVolume(volume: VolumeData) {
+        volumeManager.getVolumeId(volume)?.let { volumeManager.closeVolume(it) }
+        volumeDatabase.removeVolume(volume.name)
+    }
+
     private fun removeVolumes(volumes: List<VolumeData>, i: Int = 0, doDeleteVolumeContent: Boolean? = null) {
         if (i < volumes.size) {
             if (volumes[i].isHidden) {
@@ -196,12 +210,12 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                         .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 {
@@ -213,11 +227,11 @@ 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 {
@@ -241,9 +255,6 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         return when (item.itemId) {
             android.R.id.home -> {
                 if (explorerRouter.pickMode || explorerRouter.dropMode) {
-                    if (explorerRouter.pickMode) {
-                        shouldCloseVolume = false
-                    }
                     finish()
                 } else {
                     unselectAll()
@@ -255,6 +266,15 @@ 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)
@@ -325,6 +345,9 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         menu.findItem(R.id.settings).isVisible = !explorerRouter.pickMode && !explorerRouter.dropMode
         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.delete_password_hash).isVisible =
             isSelecting &&
@@ -456,11 +479,8 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
                 volumeAdapter.refresh()
             }
 
-            override fun onVolumeOpened(encryptedVolume: EncryptedVolume, volumeShortName: String) {
+            override fun onVolumeOpened(id: Int) {
-                startActivity(explorerRouter.getExplorerIntent(encryptedVolume, volumeShortName))
+                startActivity(explorerRouter.getExplorerIntent(id, volume.shortName))
-                if (explorerRouter.pickMode) {
-                    shouldCloseVolume = false
-                }
                 if (explorerRouter.dropMode || explorerRouter.pickMode) {
                     finish()
                 }
@@ -468,18 +488,8 @@ class MainActivity : BaseActivity(), VolumeAdapter.Listener {
         })
     }
 
-    override fun onResume() {
-        super.onResume()
-        shouldCloseVolume = true
-    }
-
     override fun onStop() {
         super.onStop()
         volumeOpener.wipeSensitive()
-        if (explorerRouter.pickMode && !usfKeepOpen && shouldCloseVolume) {
-            IntentUtils.getParcelableExtra<EncryptedVolume>(intent, "volume")?.close()
-            RestrictedFileProvider.wipeAll(this)
-            finish()
-        }
     }
 }

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

@@ -44,6 +44,17 @@ class VolumeData(val name: String, val isHidden: Boolean = false, val type: Byte
         }
     }
 
+    override fun equals(other: Any?): Boolean {
+        if (other !is VolumeData) {
+            return false
+        }
+        return other.name == name && other.isHidden == isHidden
+    }
+
+    override fun hashCode(): Int {
+        return name.hashCode()+isHidden.hashCode()
+    }
+
     companion object {
         const val VOLUMES_DIRECTORY = "volumes"
 

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

@@ -0,0 +1,42 @@
+package sushi.hardcore.droidfs
+
+import sushi.hardcore.droidfs.filesystems.EncryptedVolume
+
+class VolumeManager {
+    private var id = 0
+    private val volumes = HashMap<Int, EncryptedVolume>()
+    private val volumesData = HashMap<VolumeData, Int>()
+
+    fun insert(volume: EncryptedVolume, data: VolumeData): Int {
+        volumes[id] = volume
+        volumesData[data] = id
+        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 closeVolume(id: Int) {
+        volumes.remove(id)?.let { volume ->
+            volume.close()
+            volumesData.filter { it.value == id }.forEach {
+                volumesData.remove(it.key)
+            }
+        }
+    }
+
+    fun closeAll() {
+        volumes.forEach { it.value.close() }
+        volumes.clear()
+        volumesData.clear()
+    }
+}

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

@@ -0,0 +1,49 @@
+package sushi.hardcore.droidfs
+
+import android.app.Application
+import android.content.SharedPreferences
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.ProcessLifecycleOwner
+import androidx.preference.PreferenceManager
+import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
+
+class VolumeManagerApp : Application(), DefaultLifecycleObserver {
+    companion object {
+        private const val USF_KEEP_OPEN_KEY = "usf_keep_open"
+    }
+
+    lateinit var sharedPreferences: SharedPreferences
+    private val sharedPreferencesListener = SharedPreferences.OnSharedPreferenceChangeListener { _, key ->
+        if (key == USF_KEEP_OPEN_KEY) {
+            reloadUsfKeepOpen()
+        }
+    }
+    private var usfKeepOpen = false
+    var isStartingExternalApp = false
+    val volumeManager = VolumeManager()
+
+    override fun onCreate() {
+        super<Application>.onCreate()
+        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
+        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this).apply {
+            registerOnSharedPreferenceChangeListener(sharedPreferencesListener)
+        }
+        reloadUsfKeepOpen()
+    }
+
+    private fun reloadUsfKeepOpen() {
+        usfKeepOpen = sharedPreferences.getBoolean(USF_KEEP_OPEN_KEY, false)
+    }
+
+    override fun onResume(owner: LifecycleOwner) {
+        isStartingExternalApp = false
+    }
+
+    override fun onStop(owner: LifecycleOwner) {
+        if (!isStartingExternalApp && !usfKeepOpen) {
+            volumeManager.closeAll()
+            RestrictedFileProvider.wipeAll(applicationContext)
+        }
+    }
+}

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

@@ -22,7 +22,7 @@ class VolumeOpener(
 ) {
     interface VolumeOpenerCallbacks {
         fun onHashStorageReset() {}
-        fun onVolumeOpened(encryptedVolume: EncryptedVolume, volumeShortName: String)
+        fun onVolumeOpened(id: Int)
     }
 
     private val volumeDatabase = VolumeDatabase(activity)
@@ -31,6 +31,7 @@ class VolumeOpener(
     var themeValue = sharedPrefs.getString(Constants.THEME_VALUE_KEY, Constants.DEFAULT_THEME_VALUE)!!
     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) {
@@ -40,6 +41,8 @@ class VolumeOpener(
 
     @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
@@ -71,7 +74,7 @@ class VolumeOpener(
                                             .setPositiveButton(R.string.ok, null)
                                             .show()
                                     } else {
-                                    callbacks.onVolumeOpened(encryptedVolume, volume.shortName)
+                                        callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
                                     }
                                 }
                             }
@@ -89,6 +92,9 @@ class VolumeOpener(
             if (askForPassword) {
                 askForPassword(volume, isVolumeSaved, callbacks)
             }
+        } else {
+            callbacks.onVolumeOpened(volumeId)
+        }
     }
 
     fun wipeSensitive() {
@@ -188,7 +194,7 @@ class VolumeOpener(
                         override fun onPasswordHashDecrypted(hash: ByteArray) {}
                         override fun onPasswordHashSaved() {
                             Arrays.fill(returnedHash.value!!, 0)
-                            callbacks.onVolumeOpened(encryptedVolume, volume.shortName)
+                            callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
                         }
                         private var isClosed = false
                         override fun onFailed(pending: Boolean) {
@@ -201,7 +207,7 @@ class VolumeOpener(
                     }
                     fingerprintProtector.savePasswordHash(volume, returnedHash.value!!)
                 } else {
-                    callbacks.onVolumeOpened(encryptedVolume, volume.shortName)
+                    callbacks.onVolumeOpened(volumeManager.insert(encryptedVolume, volume))
                 }
             }
         }

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

@@ -8,15 +8,18 @@ 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.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,
@@ -80,16 +83,12 @@ 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) {
+            itemView.findViewById<ImageView>(R.id.icon_unlocked).isVisible = volumeManager.isOpen(volume)
-                View.GONE
+            itemView.findViewById<ImageView>(R.id.icon_fingerprint).isVisible = volume.encryptedHash != null
-            } else {
-                View.VISIBLE
-            }
             itemView.findViewById<TextView>(R.id.text_info).text = context.getString(
                 if (volume.canWrite(context.filesDir.path)) {
                     R.string.volume_type

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

@@ -4,11 +4,8 @@ import android.os.Bundle
 import android.view.MenuItem
 import androidx.activity.addCallback
 import sushi.hardcore.droidfs.*
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.databinding.ActivityAddVolumeBinding
 import sushi.hardcore.droidfs.explorers.ExplorerRouter
-import sushi.hardcore.droidfs.filesystems.EncryptedVolume
-import sushi.hardcore.droidfs.util.IntentUtils
 
 class AddVolumeActivity: BaseActivity() {
 
@@ -19,15 +16,12 @@ class AddVolumeActivity: BaseActivity() {
     private lateinit var binding: ActivityAddVolumeBinding
     private lateinit var explorerRouter: ExplorerRouter
     private lateinit var volumeOpener: VolumeOpener
-    private var usfKeepOpen = false
-    var shouldCloseVolume = true // used when launched to pick file from another volume
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         binding = ActivityAddVolumeBinding.inflate(layoutInflater)
         setContentView(binding.root)
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
-        usfKeepOpen = sharedPrefs.getBoolean("usf_keep_open", false)
         explorerRouter = ExplorerRouter(this, intent)
         volumeOpener = VolumeOpener(this)
         if (savedInstanceState == null) {
@@ -41,7 +35,6 @@ class AddVolumeActivity: BaseActivity() {
         }
         onBackPressedDispatcher.addCallback(this) {
             setResult(RESULT_USER_BACK)
-            shouldCloseVolume = false
             isEnabled = false
             onBackPressedDispatcher.onBackPressed()
         }
@@ -53,7 +46,6 @@ class AddVolumeActivity: BaseActivity() {
                 supportFragmentManager.popBackStack()
             else {
                 setResult(RESULT_USER_BACK)
-                shouldCloseVolume = false
                 finish()
             }
         }
@@ -70,21 +62,19 @@ class AddVolumeActivity: BaseActivity() {
         )
     }
 
-    fun startExplorer(encryptedVolume: EncryptedVolume, volumeShortName: String) {
+    fun startExplorer(volumeId: Int, volumeShortName: String) {
-        startActivity(explorerRouter.getExplorerIntent(encryptedVolume, volumeShortName))
+        startActivity(explorerRouter.getExplorerIntent(volumeId, volumeShortName))
-        shouldCloseVolume = false
         finish()
     }
 
     fun onVolumeSelected(volume: VolumeData, rememberVolume: Boolean) {
         if (rememberVolume) {
             setResult(RESULT_USER_BACK)
-            shouldCloseVolume = false
             finish()
         } else {
             volumeOpener.openVolume(volume, false, object : VolumeOpener.VolumeOpenerCallbacks {
-                override fun onVolumeOpened(encryptedVolume: EncryptedVolume, volumeShortName: String) {
+                override fun onVolumeOpened(id: Int) {
-                    startExplorer(encryptedVolume, volumeShortName)
+                    startExplorer(id, volume.shortName)
                 }
             })
         }
@@ -106,18 +96,4 @@ class AddVolumeActivity: BaseActivity() {
             .addToBackStack(null)
             .commit()
     }
-
-    override fun onStart() {
-        super.onStart()
-        shouldCloseVolume = true
-    }
-
-    override fun onStop() {
-        super.onStop()
-        if (explorerRouter.pickMode && !usfKeepOpen && shouldCloseVolume) {
-            IntentUtils.getParcelableExtra<EncryptedVolume>(intent, "volume")?.close()
-            RestrictedFileProvider.wipeAll(this)
-            finish()
-        }
-    }
 }

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

@@ -158,11 +158,7 @@ class CreateVolumeFragment: Fragment() {
             } else {
                 null
             }
-            val encryptedVolume = if (rememberVolume) {
+            val encryptedVolume = ObjRef<EncryptedVolume?>(null)
-                null
-            } else {
-                ObjRef<EncryptedVolume?>(null)
-            }
             object: LoadingTask<Byte>(requireActivity() as AppCompatActivity, themeValue, R.string.loading_msg_create) {
                 private fun generateResult(success: Boolean, volumeType: Byte): Byte {
                     return if (success) {
@@ -223,6 +219,9 @@ class CreateVolumeFragment: Fragment() {
                             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 (isVolumeSaved && binding.checkboxSavePassword.isChecked && returnedHash != null) {
                         fingerprintProtector!!.let {
@@ -235,31 +234,31 @@ class CreateVolumeFragment: Fragment() {
                                 override fun onPasswordHashDecrypted(hash: ByteArray) {} // shouldn't happen here
                                 override fun onPasswordHashSaved() {
                                     Arrays.fill(returnedHash.value!!, 0)
-                                    onVolumeCreated(encryptedVolume?.value, volume.shortName)
+                                    onVolumeCreated(volumeId, volume.shortName)
                                 }
                                 override fun onFailed(pending: Boolean) {
                                     if (!pending) {
                                         Arrays.fill(returnedHash.value!!, 0)
-                                        onVolumeCreated(encryptedVolume?.value, volume.shortName)
+                                        onVolumeCreated(volumeId, volume.shortName)
                                     }
                                 }
                             }
                             it.savePasswordHash(volume, returnedHash.value!!)
                         }
                     } else {
-                        onVolumeCreated(encryptedVolume?.value, volume.shortName)
+                        onVolumeCreated(volumeId, volume.shortName)
                     }
                 }
             }
         }
     }
 
-    private fun onVolumeCreated(encryptedVolume: EncryptedVolume?, volumeShortName: String) {
+    private fun onVolumeCreated(id: Int?, volumeShortName: String) {
         (activity as AddVolumeActivity).apply {
-            if (rememberVolume || encryptedVolume == null) {
+            if (rememberVolume || id == null) {
                 finish()
             } else {
-                startExplorer(encryptedVolume, volumeShortName)
+                startExplorer(id, volumeShortName)
             }
         }
     }

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

@@ -24,6 +24,7 @@ import sushi.hardcore.droidfs.Constants
 import sushi.hardcore.droidfs.R
 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
@@ -62,6 +63,7 @@ class SelectPathFragment: Fragment() {
         if (uri != null)
             onDirectoryPicked(uri)
     }
+    private lateinit var app: VolumeManagerApp
     private var themeValue = Constants.DEFAULT_THEME_VALUE
     private lateinit var volumeDatabase: VolumeDatabase
     private lateinit var filesDir: String
@@ -81,6 +83,7 @@ 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
@@ -105,6 +108,7 @@ class SelectPathFragment: Fragment() {
                 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) {
@@ -119,6 +123,7 @@ class SelectPathFragment: Fragment() {
                 ) {
                     launchPickDirectory()
                 } else {
+                    app.isStartingExternalApp = true
                     askStoragePermissions.launch(
                         arrayOf(
                             Manifest.permission.READ_EXTERNAL_STORAGE,
@@ -149,7 +154,7 @@ class SelectPathFragment: Fragment() {
     }
 
     private fun launchPickDirectory() {
-        (activity as AddVolumeActivity).shouldCloseVolume = false
+        app.isStartingExternalApp = true
         PathUtils.safePickDirectory(pickDirectory, requireContext(), themeValue)
     }
 

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

@@ -15,7 +15,7 @@ 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.UUID
 import java.util.regex.Pattern
 
 class RestrictedFileProvider: ContentProvider() {

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

@@ -13,6 +13,7 @@ import android.view.View
 import android.widget.ImageButton
 import android.widget.TextView
 import android.widget.Toast
+import androidx.activity.addCallback
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
@@ -22,20 +23,15 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import kotlinx.coroutines.*
-import sushi.hardcore.droidfs.BaseActivity
+import sushi.hardcore.droidfs.*
-import sushi.hardcore.droidfs.Constants
-import sushi.hardcore.droidfs.FileTypes
-import sushi.hardcore.droidfs.R
 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.file_operations.FileOperationService
 import sushi.hardcore.droidfs.file_operations.OperationFile
 import sushi.hardcore.droidfs.file_viewers.*
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.filesystems.Stat
-import sushi.hardcore.droidfs.util.IntentUtils
 import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.EditTextDialog
@@ -46,6 +42,7 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     private var foldersFirst = true
     private var mapFolders = true
     private var currentSortOrderIndex = 0
+    private var volumeId = -1
     protected lateinit var encryptedVolume: EncryptedVolume
     private lateinit var volumeName: String
     private lateinit var explorerViewModel: ExplorerViewModel
@@ -58,10 +55,8 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
     protected val taskScope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
     protected lateinit var explorerElements: MutableList<ExplorerElement>
     protected lateinit var explorerAdapter: ExplorerElementAdapter
-    private var isCreating = true
+    protected lateinit var app: VolumeManagerApp
-    protected var isStartingActivity = false
     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
@@ -76,10 +71,11 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
 
     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("volumeName") ?: ""
-        volumeName = intent.getStringExtra("volume_name") ?: ""
+        volumeId = intent.getIntExtra("volumeId", -1)
-        encryptedVolume = IntentUtils.getParcelableExtra(intent, "volume")!!
+        encryptedVolume = app.volumeManager.getVolume(volumeId)!!
         sortOrderEntries = resources.getStringArray(R.array.sort_orders_entries)
         sortOrderValues = resources.getStringArray(R.array.sort_orders_values)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
@@ -118,6 +114,19 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         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()
@@ -177,12 +186,11 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
             putExtra("volume", encryptedVolume)
             putExtra("sortOrder", sortOrderValues[currentSortOrderIndex])
         }
-        isStartingActivity = true
         startActivity(intent)
     }
 
     private fun openWithExternalApp(fullPath: String) {
-        isStartingActivity = true
+        app.isStartingExternalApp = true
         ExternalProvider.open(this, themeValue, encryptedVolume, fullPath)
     }
 
@@ -332,28 +340,18 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         }
     }
 
-    private fun askCloseVolume() {
+    private fun askLockVolume() {
         CustomAlertDialogBuilder(this, themeValue)
                 .setTitle(R.string.warning)
-                .setMessage(R.string.ask_close_volume)
+                .setMessage(R.string.ask_lock_volume)
-                .setPositiveButton(R.string.ok) { _, _ -> closeVolumeOnUserExit() }
+                .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()
@@ -508,9 +506,9 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
         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)
         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) {
@@ -577,55 +575,33 @@ open class BaseExplorerActivity : BaseActivity(), ExplorerElementAdapter.Listene
                 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() {
-        taskScope.cancel()
-        if (!encryptedVolume.isClosed()) {
-            encryptedVolume.close()
-        }
-        RestrictedFileProvider.wipeAll(this) //additional security
-    }
-
     override fun onDestroy() {
         super.onDestroy()
         if (!isChangingConfigurations) { //activity won't be recreated
-            closeVolumeOnDestroy()
+            taskScope.cancel()
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!isChangingConfigurations){
-            if (isStartingActivity){
-                isStartingActivity = false
-            } else if (!usf_keep_open){
-                finish()
-            }
         }
     }
 
     override fun onResume() {
         super.onResume()
-        if (isCreating){
+        if (app.isStartingExternalApp) {
-            isCreating = false
+            ExternalProvider.removeFilesAsync(this)
-        } else {
+        }
         if (encryptedVolume.isClosed()) {
             finish()
         } else {
-                isStartingActivity = false
-                ExternalProvider.removeFilesAsync(this)
             setCurrentPath(currentDirectoryPath)
         }
     }
 }
-}

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

@@ -6,6 +6,7 @@ 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 com.google.android.material.floatingactionbutton.FloatingActionButton
@@ -60,9 +61,7 @@ class ExplorerActivity : BaseExplorerActivity() {
                 }
                 if (operationFiles.size > 0){
                     checkPathOverwrite(operationFiles, currentDirectoryPath) { items ->
-                        if (items == null) {
+                        if (items != null) {
-                            remoteEncryptedVolume.close()
-                        } else {
                             // stop loading thumbnails while writing files
                             explorerAdapter.loadThumbnails = false
                             taskScope.launch {
@@ -78,12 +77,9 @@ class ExplorerActivity : BaseExplorerActivity() {
                                 }
                                 explorerAdapter.loadThumbnails = true
                                 setCurrentPath(currentDirectoryPath)
-                                remoteEncryptedVolume.close()
                             }
                         }
                     }
-                } else {
-                    remoteEncryptedVolume.close()
                 }
             }
         }
@@ -169,6 +165,16 @@ class ExplorerActivity : BaseExplorerActivity() {
 
     override fun init() {
         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()
@@ -189,15 +195,14 @@ class ExplorerActivity : BaseExplorerActivity() {
                                 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" -> {
@@ -212,7 +217,6 @@ class ExplorerActivity : BaseExplorerActivity() {
                                 val intent = Intent(this, CameraActivity::class.java)
                                 intent.putExtra("path", currentDirectoryPath)
                                 intent.putExtra("volume", encryptedVolume)
-                                isStartingActivity = true
                                 startActivity(intent)
                             }
                         }
@@ -257,6 +261,7 @@ class ExplorerActivity : BaseExplorerActivity() {
         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 {
@@ -405,13 +410,13 @@ class ExplorerActivity : BaseExplorerActivity() {
                 for (i in explorerAdapter.selectedItems) {
                     paths.add(explorerElements[i].fullPath)
                 }
-                isStartingActivity = true
+                app.isStartingExternalApp = true
                 ExternalProvider.share(this, themeValue, encryptedVolume, paths)
                 unselectAll()
                 true
             }
             R.id.decrypt -> {
-                isStartingActivity = true
+                app.isStartingExternalApp = true
                 pickExportDirectory.launch(null)
                 true
             }
@@ -506,13 +511,4 @@ class ExplorerActivity : BaseExplorerActivity() {
             itemsToProcess.clear()
         }
     }
-
-    override fun onBackPressed() {
-        if (currentItemAction != ItemsActions.NONE) {
-            cancelItemAction()
-            invalidateOptionsMenu()
-        } else {
-            super.onBackPressed()
-        }
-    }
 }

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

@@ -22,9 +22,7 @@ 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 -> {
@@ -39,7 +37,6 @@ class ExplorerActivityPick : BaseExplorerActivity() {
                 }
             }
         }
-        }
         invalidateOptionsMenu()
     }
 
@@ -81,17 +78,4 @@ class ExplorerActivityPick : BaseExplorerActivity() {
         isFinishingIntentionally = true
         finish()
     }
-
-    override fun closeVolumeOnDestroy() {
-        if (!isFinishingIntentionally && !usf_keep_open){
-            IntentUtils.getParcelableExtra<EncryptedVolume>(intent, "destinationVolume")?.close()
-            super.closeVolumeOnDestroy()
-        }
-    }
-
-    override fun closeVolumeOnUserExit() {
-        isFinishingIntentionally = true
-        super.closeVolumeOnUserExit()
-        super.closeVolumeOnDestroy()
-    }
 }

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

@@ -9,7 +9,7 @@ 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(encryptedVolume: EncryptedVolume, volumeShortName: String): Intent {
+    fun getExplorerIntent(volumeId: Int, volumeShortName: String): Intent {
         var explorerIntent: Intent? = null
         if (dropMode) { //import via android share menu
             explorerIntent = Intent(context, ExplorerActivityDrop::class.java)
@@ -22,8 +22,8 @@ class ExplorerRouter(private val context: Context, private val intent: Intent) {
         if (explorerIntent == null) {
             explorerIntent = Intent(context, ExplorerActivity::class.java) //default opening
         }
-        explorerIntent.putExtra("volume", encryptedVolume)
+        explorerIntent.putExtra("volumeId", volumeId)
-        explorerIntent.putExtra("volume_name", volumeShortName)
+        explorerIntent.putExtra("volumeName", volumeShortName)
         return explorerIntent
     }
 }

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

@@ -2,7 +2,6 @@ package sushi.hardcore.droidfs.file_viewers
 
 import android.os.Bundle
 import android.view.View
-import androidx.activity.addCallback
 import androidx.core.content.ContextCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
@@ -14,7 +13,6 @@ import kotlinx.coroutines.withContext
 import sushi.hardcore.droidfs.BaseActivity
 import sushi.hardcore.droidfs.FileTypes
 import sushi.hardcore.droidfs.R
-import sushi.hardcore.droidfs.content_providers.RestrictedFileProvider
 import sushi.hardcore.droidfs.explorers.ExplorerElement
 import sushi.hardcore.droidfs.filesystems.EncryptedVolume
 import sushi.hardcore.droidfs.util.IntentUtils
@@ -27,8 +25,6 @@ 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>()
@@ -43,17 +39,11 @@ abstract class FileViewerActivity: BaseActivity() {
         filePath = intent.getStringExtra("path")!!
         originalParentPath = PathUtils.getParentPath(filePath)
         encryptedVolume = IntentUtils.getParcelableExtra(intent, "volume")!!
-        usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         windowInsetsController = WindowInsetsControllerCompat(window, window.decorView)
         windowInsetsController.addOnControllableInsetsChangedListener { _, typeMask ->
             windowTypeMask = typeMask
         }
-        onBackPressedDispatcher.addCallback(this) {
-            isFinishingIntentionally = true
-            isEnabled = false
-            onBackPressedDispatcher.onBackPressed()
-        }
         if (fullscreenMode) {
             fixNavBarColor()
             hideSystemUi()
@@ -156,21 +146,12 @@ abstract class FileViewerActivity: BaseActivity() {
     }
 
     protected fun goBackToExplorer() {
-        isFinishingIntentionally = true
         finish()
     }
 
-    override fun onDestroy() {
+    override fun onResume() {
-        super.onDestroy()
+        super.onResume()
-        if (!isFinishingIntentionally) {
+        if (encryptedVolume.isClosed()) {
-            encryptedVolume.close()
-            RestrictedFileProvider.wipeAll(this)
-        }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        if (!usf_keep_open) {
             finish()
         }
     }

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

@@ -7,6 +7,7 @@ import android.view.Menu
 import android.view.MenuItem
 import android.widget.EditText
 import android.widget.Toast
+import androidx.activity.addCallback
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import java.io.File
@@ -29,6 +30,9 @@ class TextEditor: FileViewerActivity() {
         loadWholeFile(filePath) {
             try {
                 loadLayout(String(it))
+                onBackPressedDispatcher.addCallback(this) {
+                    checkSaveAndExit()
+                }
             } catch (e: OutOfMemoryError){
                 CustomAlertDialogBuilder(this, themeValue)
                     .setTitle(R.string.error)
@@ -124,8 +128,4 @@ class TextEditor: FileViewerActivity() {
         }
         return true
     }
-
-    override fun onBackPressed() {
-        checkSaveAndExit()
-    }
 }

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

@@ -67,13 +67,9 @@ class CryfsVolume(private val fusePtr: Long): EncryptedVolume() {
             }
         }
 
-        fun create(baseDir: String, localStateDir: String, password: ByteArray, returnedHash: ObjRef<ByteArray?>?, cipher: String?, volume: ObjRef<EncryptedVolume?>?): Boolean {
+        fun create(baseDir: String, localStateDir: String, password: ByteArray, returnedHash: ObjRef<ByteArray?>?, cipher: String?, volume: ObjRef<EncryptedVolume?>): Boolean {
             return init(baseDir, localStateDir, password, null, returnedHash, true, cipher)?.also {
-                if (volume == null) {
-                    it.close()
-                } else {
                 volume.value = it
-                }
             } != null
         }
 

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

@@ -36,7 +36,6 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
             logN: Int,
             creator: String,
             returnedHash: ByteArray?,
-            openAfterCreation: Boolean,
         ): Int
         private external fun nativeInit(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): Int
         external fun changePassword(
@@ -53,22 +52,28 @@ class GocryptfsVolume(private val sessionID: Int): EncryptedVolume() {
             plainTextNames: Boolean,
             xchacha: Int,
             returnedHash: ByteArray?,
-            volume: ObjRef<EncryptedVolume?>?
+            volume: ObjRef<EncryptedVolume?>
         ): Boolean {
-            val openAfterCreation = volume != null
+            return when (val result = nativeCreateVolume(
-            val result = nativeCreateVolume(root_cipher_dir, password, plainTextNames, xchacha, ScryptDefaultLogN, VOLUME_CREATOR, returnedHash, openAfterCreation)
+                root_cipher_dir,
-            return if (!openAfterCreation) {
+                password,
-                result == 1
+                plainTextNames,
-            } else if (result == -1) {
+                xchacha,
+                ScryptDefaultLogN,
+                VOLUME_CREATOR,
+                returnedHash,
+            )) {
+                -1 -> {
                     Log.e("gocryptfs", "Failed to open volume after creation")
                     true
-            } else if (result == -2) {
+                }
-                false
+                -2 -> false
-            } else {
+                else -> {
-                volume!!.value = GocryptfsVolume(result)
+                    volume.value = GocryptfsVolume(result)
                     true
                 }
             }
+        }
 
         fun init(root_cipher_dir: String, password: ByteArray?, givenHash: ByteArray?, returnedHash: ByteArray?): GocryptfsVolume? {
             val sessionId = nativeInit(root_cipher_dir, password, givenHash, returnedHash)

app/src/main/native/gocryptfs_jni.c

@@ -1,8 +1,6 @@
 #include <jni.h>
-#include <stdio.h>
 #include <malloc.h>
 #include <string.h>
-#include <sys/stat.h>
 #include "libgocryptfs.h"
 
 const int KeyLen = 32;
@@ -15,38 +13,34 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeCre
                                                                              jint xchacha,
                                                                              jint logN,
                                                                              jstring jcreator,
-                                                                             jbyteArray jreturned_hash,
+                                                                             jbyteArray jreturned_hash) {
-                                                                             jboolean open_after_creation) {
     const char* root_cipher_dir = (*env)->GetStringUTFChars(env, jroot_cipher_dir, NULL);
     const char* creator = (*env)->GetStringUTFChars(env, jcreator, NULL);
     GoString gofilename = {root_cipher_dir, strlen(root_cipher_dir)}, gocreator = {creator, strlen(creator)};
 
-    const size_t password_len = (*env)->GetArrayLength(env, jpassword);
+    const size_t password_len = (const size_t) (*env)->GetArrayLength(env, jpassword);
     jbyte* password = (*env)->GetByteArrayElements(env, jpassword, NULL);
     GoSlice go_password = {password, password_len, password_len};
 
     size_t returned_hash_len;
     GoSlice go_returned_hash;
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
         go_returned_hash.data = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
-    } else if (open_after_creation) {
+    } else {
         returned_hash_len = KeyLen;
         go_returned_hash.data = malloc(KeyLen);
-    } else {
-        returned_hash_len = 0;
-        go_returned_hash.data = NULL;
     }
     go_returned_hash.len = returned_hash_len;
     go_returned_hash.cap = returned_hash_len;
 
-    GoUint8 result = gcf_create_volume(gofilename, go_password, plainTextNames, xchacha, logN, gocreator, go_returned_hash);
+    GoUint8 result = gcf_create_volume(gofilename, go_password, plainTextNames, (GoInt8) xchacha, logN, gocreator, go_returned_hash);
 
     (*env)->ReleaseByteArrayElements(env, jpassword, password, 0);
     (*env)->ReleaseStringUTFChars(env, jcreator, creator);
 
     GoInt sessionID = -2;
-    if (result && open_after_creation) {
+    if (result) {
         GoSlice null_slice = {NULL, 0, 0};
         sessionID = gcf_init(gofilename, null_slice, go_returned_hash, null_slice);
     }
@@ -55,14 +49,14 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeCre
 
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
         (*env)->ReleaseByteArrayElements(env, jreturned_hash, go_returned_hash.data, 0);
-    } else if (open_after_creation) {
+    } else {
         for (unsigned int i=0; i<returned_hash_len; ++i) {
             ((unsigned char*) go_returned_hash.data)[i] = 0;
         }
         free(go_returned_hash.data);
     }
 
-    return sessionID*open_after_creation+result*!open_after_creation;
+    return sessionID;
 }
 
 JNIEXPORT jint JNICALL
@@ -81,13 +75,13 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeIni
     jbyte* given_hash;
     GoSlice go_given_hash = {NULL, 0, 0};
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        password_len = (*env)->GetArrayLength(env, jpassword);
+        password_len = (size_t) (*env)->GetArrayLength(env, jpassword);
         password = (*env)->GetByteArrayElements(env, jpassword, NULL);
         go_password.data = password;
         go_password.len = password_len;
         go_password.cap = password_len;
     } else {
-        given_hash_len = (*env)->GetArrayLength(env, jgiven_hash);
+        given_hash_len = (size_t) (*env)->GetArrayLength(env, jgiven_hash);
         given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
         go_given_hash.data = given_hash;
         go_given_hash.len = given_hash_len;
@@ -98,7 +92,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_nativeIni
     jbyte* returned_hash;
     GoSlice go_returned_hash = {NULL, 0, 0};
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)){
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
         returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
         go_returned_hash.data = returned_hash;
         go_returned_hash.len = returned_hash_len;
@@ -145,20 +139,20 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_changePas
     jbyte* given_hash;
     GoSlice go_given_hash = {NULL, 0, 0};
     if ((*env)->IsSameObject(env, jgiven_hash, NULL)){
-        old_password_len = (*env)->GetArrayLength(env, jold_password);
+        old_password_len = (size_t) (*env)->GetArrayLength(env, jold_password);
         old_password = (*env)->GetByteArrayElements(env, jold_password, NULL);
         go_old_password.data = old_password;
         go_old_password.len = old_password_len;
         go_old_password.cap = old_password_len;
     } else {
-        given_hash_len = (*env)->GetArrayLength(env, jgiven_hash);
+        given_hash_len = (size_t) (*env)->GetArrayLength(env, jgiven_hash);
         given_hash = (*env)->GetByteArrayElements(env, jgiven_hash, NULL);
         go_given_hash.data = given_hash;
         go_given_hash.len = given_hash_len;
         go_given_hash.cap = given_hash_len;
     }
 
-    size_t new_password_len = (*env)->GetArrayLength(env, jnew_password);
+    size_t new_password_len = (size_t) (*env)->GetArrayLength(env, jnew_password);
     jbyte* new_password = (*env)->GetByteArrayElements(env, jnew_password, NULL);
     GoSlice go_new_password = {new_password, new_password_len, new_password_len};
 
@@ -166,7 +160,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_00024Companion_changePas
     jbyte* returned_hash;
     GoSlice go_returned_hash = {NULL, 0, 0};
     if (!(*env)->IsSameObject(env, jreturned_hash, NULL)) {
-        returned_hash_len = (*env)->GetArrayLength(env, jreturned_hash);
+        returned_hash_len = (size_t) (*env)->GetArrayLength(env, jreturned_hash);
         returned_hash = (*env)->GetByteArrayElements(env, jreturned_hash, NULL);
         go_returned_hash.data = returned_hash;
         go_returned_hash.len = returned_hash_len;
@@ -303,7 +297,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1open_1write_1mod
     const char* file_path = (*env)->GetStringUTFChars(env, jfile_path, NULL);
     GoString go_file_path = {file_path, strlen(file_path)};
 
-    GoInt handleID = gcf_open_write_mode(sessionID, go_file_path, mode);
+    GoInt handleID = gcf_open_write_mode(sessionID, go_file_path, (GoUint32) mode);
 
     (*env)->ReleaseStringUTFChars(env, jfile_path, file_path);
 
@@ -317,7 +311,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1write_1file(JNIE
     jbyte* buff = (*env)->GetByteArrayElements(env, jbuff, NULL);
     GoSlice go_buff = {buff+src_offset, length, length};
 
-    int written = gcf_write_file(sessionID, handleID, file_offset, go_buff);
+    int written = gcf_write_file(sessionID, handleID, (GoUint64) file_offset, go_buff);
 
     (*env)->ReleaseByteArrayElements(env, jbuff, buff, 0);
 
@@ -331,7 +325,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1read_1file(JNIEn
     jbyte* buff = (*env)->GetByteArrayElements(env, jbuff, NULL);
     GoSlice go_buff = {buff+dst_offset, length, length};
 
-    int read = gcf_read_file(sessionID, handleID, file_offset, go_buff);
+    int read = gcf_read_file(sessionID, handleID, (GoUint64) file_offset, go_buff);
 
     (*env)->ReleaseByteArrayElements(env, jbuff, buff, 0);
     return read;
@@ -345,7 +339,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1truncate(JNIEnv
     const char* path = (*env)->GetStringUTFChars(env, jpath, NULL);
     GoString go_path = {path, strlen(path)};
 
-    GoUint8 result = gcf_truncate(sessionID, go_path, offset);
+    GoUint8 result = gcf_truncate(sessionID, go_path, (GoUint64) offset);
 
     (*env)->ReleaseStringUTFChars(env, jpath, path);
     return result;
@@ -377,7 +371,7 @@ Java_sushi_hardcore_droidfs_filesystems_GocryptfsVolume_native_1mkdir(JNIEnv *en
     const char* dir_path = (*env)->GetStringUTFChars(env, jdir_path, NULL);
     GoString go_dir_path = {dir_path, strlen(dir_path)};
 
-    GoUint8 result = gcf_mkdir(sessionID, go_dir_path, mode);
+    GoUint8 result = gcf_mkdir(sessionID, go_dir_path, (GoUint32) mode);
 
     (*env)->ReleaseStringUTFChars(env, jdir_path, dir_path);
 

app/src/main/res/drawable/icon_decrypt.xml

@@ -1,4 +0,0 @@
-<vector android:height="24dp" android:viewportHeight="500"
-    android:viewportWidth="500" android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
-    <path android:fillColor="?attr/colorAccent" android:pathData="M68.29,431.711c0,20.078 16.264,36.34 36.343,36.34h290.734c20.078,0 36.345,-16.262 36.345,-36.34V250c0,-20.079 -16.267,-36.342 -36.345,-36.342H177.317v-63.597c0,-40.157 32.525,-72.685 72.683,-72.685c40.158,0 72.685,32.528 72.685,72.685v4.541c0,12.538 10.176,22.715 22.711,22.715c12.537,0 22.717,-10.177 22.717,-22.715v-4.541c0,-65.232 -52.882,-118.111 -118.112,-118.111c-65.24,0 -118.111,52.879 -118.111,118.111v63.597h-27.256c-20.079,0 -36.343,16.263 -36.343,36.342V431.711zM213.658,313.599c0,-20.078 16.263,-36.341 36.342,-36.341s36.341,16.263 36.341,36.341c0,12.812 -6.634,24.079 -16.625,30.529c0,0 3.55,21.446 7.542,46.699c0,7.538 -6.087,13.625 -13.629,13.625h-27.258c-7.541,0 -13.627,-6.087 -13.627,-13.625l7.542,-46.699C220.294,337.678 213.658,326.41 213.658,313.599z"/>
-</vector>

app/src/main/res/drawable/icon_lock.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM15.1,8L8.9,8L8.9,6c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2z"/>
+</vector>

app/src/main/res/drawable/icon_lock_open.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="?attr/colorAccent" android:pathData="M12,17c1.1,0 2,-0.9 2,-2s-0.9,-2 -2,-2 -2,0.9 -2,2 0.9,2 2,2zM18,8h-1L17,6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6h1.9c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2L6,8c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2L20,10c0,-1.1 -0.9,-2 -2,-2zM18,20L6,20L6,10h12v10z"/>
+</vector>

app/src/main/res/layout/adapter_volume.xml

@@ -8,21 +8,23 @@
     <RelativeLayout
         android:id="@+id/selectable_container"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="match_parent"
         android:background="?attr/selectableItemBackground"
-        tools:ignore="UselessParent">
+        tools:ignore="UselessParent"
+        android:paddingEnd="4dp">
 
         <ImageView
             android:id="@+id/image_icon"
             android:layout_width="50dp"
-            android:layout_height="50dp"/>
+            android:layout_height="50dp"
+            android:src="@drawable/icon_volume"/>
 
         <LinearLayout
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:orientation="vertical"
             android:layout_toEndOf="@id/image_icon"
-            android:layout_toStartOf="@id/icon_fingerprint">
+            android:layout_toStartOf="@id/layout_icons">
 
             <TextView
                 android:id="@+id/text_volume_name"
@@ -63,6 +65,21 @@
 
         </LinearLayout>
 
+        <LinearLayout
+            android:id="@+id/layout_icons"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:gravity="center_vertical"
+            android:layout_alignParentEnd="true">
+
+            <ImageView
+                android:id="@+id/icon_unlocked"
+                android:layout_width="30dp"
+                android:layout_height="30dp"
+                android:src="@drawable/icon_lock_open"
+                android:contentDescription="@string/volume_unlocked"
+                android:visibility="gone"/>
+
             <ImageView
                 android:id="@+id/icon_fingerprint"
                 android:layout_width="26dp"
@@ -70,9 +87,9 @@
                 android:src="@drawable/icon_fingerprint"
                 android:contentDescription="@string/password_hash_saved"
                 android:visibility="gone"
-            android:layout_alignParentEnd="true"
+                android:layout_marginStart="5dp"/>
-            android:layout_marginTop="11dp"
+
-            android:layout_marginEnd="5dp"/>
+        </LinearLayout>
 
     </RelativeLayout>
 

app/src/main/res/menu/explorer.xml

@@ -30,9 +30,8 @@
 
     <item
         android:id="@+id/decrypt"
-        app:showAsAction="ifRoom"
+        app:showAsAction="never"
         android:visible="false"
-        android:icon="@drawable/icon_decrypt"
         android:title="@string/decrypt_files"/>
 
     <item
@@ -72,6 +71,12 @@
         android:title="@string/sort_by"
         android:icon="@drawable/icon_sort"/>
 
+    <item
+        android:id="@+id/lock"
+        app:showAsAction="ifRoom"
+        android:title="@string/lock_volume"
+        android:icon="@drawable/icon_lock"/>
+
     <item
         android:id="@+id/close"
         app:showAsAction="ifRoom"

app/src/main/res/menu/explorer_drop.xml

@@ -19,6 +19,12 @@
         android:title="@string/sort_by"
         android:icon="@drawable/icon_sort"/>
 
+    <item
+        android:id="@+id/lock"
+        app:showAsAction="ifRoom"
+        android:title="@string/lock_volume"
+        android:icon="@drawable/icon_lock"/>
+
     <item
         android:id="@+id/close"
         app:showAsAction="ifRoom"

app/src/main/res/menu/explorer_pick.xml

@@ -38,6 +38,12 @@
         android:title="@string/sort_by"
         android:icon="@drawable/icon_sort"/>
 
+    <item
+        android:id="@+id/lock"
+        app:showAsAction="ifRoom"
+        android:title="@string/lock_volume"
+        android:icon="@drawable/icon_lock"/>
+
     <item
         android:id="@+id/close"
         app:showAsAction="ifRoom"

app/src/main/res/menu/main_activity.xml

@@ -9,6 +9,13 @@
         android:title="@string/select_all"
         android:icon="@drawable/icon_select_all"/>
 
+    <item
+        android:id="@+id/lock"
+        app:showAsAction="ifRoom"
+        android:visible="false"
+        android:title="@string/lock"
+        android:icon="@drawable/icon_lock"/>
+
     <item
         android:id="@+id/remove"
         app:showAsAction="ifRoom"

app/src/main/res/values-ar/strings.xml

@@ -11,7 +11,6 @@
     <string name="mkdir">إنشاء مجلد</string>
     <string name="dir_empty">مجلد فارغ</string>
     <string name="warning">تحذير !</string>
-    <string name="ask_close_volume">هل تريد إغلاق المجلد المشفر ?</string>
     <string name="ok">حسنا</string>
     <string name="cancel">إلغاء</string>
     <string name="enter_folder_name">اسم المجلد:</string>

app/src/main/res/values-es/strings.xml

@@ -11,7 +11,6 @@
     <string name="mkdir">Crear carpeta</string>
     <string name="dir_empty">Directorio vacío</string>
     <string name="warning">¡Advertencia!</string>
-    <string name="ask_close_volume">¿Estás seguro de que quieres cerrar este volumen?</string>
     <string name="ok">Aceptar</string>
     <string name="cancel">Cancelar</string>
     <string name="enter_folder_name">Nombre de la carpeta:</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -11,7 +11,6 @@
     <string name="mkdir">Criar pasta</string>
     <string name="dir_empty">Pasta vazia</string>
     <string name="warning">Aviso!</string>
-    <string name="ask_close_volume">Tem certeza que quer fechar este volume?</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancelar</string>
     <string name="enter_folder_name">Nome da pasta:</string>

app/src/main/res/values-ru/strings.xml

@@ -10,7 +10,6 @@
     <string name="mkdir">Создать папку</string>
     <string name="dir_empty">Пусто</string>
     <string name="warning">Предупреждение!</string>
-    <string name="ask_close_volume">Закрыть том?</string>
     <string name="cancel">Отмена</string>
     <string name="enter_folder_name">Имя папки:</string>
     <string name="error">Ошибка</string>

app/src/main/res/values/strings.xml

@@ -11,7 +11,7 @@
     <string name="mkdir">Create folder</string>
     <string name="dir_empty">Directory Empty</string>
     <string name="warning">Warning !</string>
-    <string name="ask_close_volume">Are you sure you want to close this volume ?</string>
+    <string name="ask_lock_volume">Are you sure you want to lock this volume ?</string>
     <string name="ok">OK</string>
     <string name="cancel">Cancel</string>
     <string name="enter_folder_name">Folder Name:</string>
@@ -253,4 +253,7 @@
     <string name="remember_volume">Remember volume</string>
     <string name="open_volume">Open volume</string>
     <string name="choose_existing_volume">Please choose an existing volume</string>
+    <string name="volume_unlocked">Volume unlocked</string>
+    <string name="lock_volume">Lock volume</string>
+    <string name="lock">Lock</string>
 </resources>

app/src/main/res/xml/unsafe_features_preferences.xml

@@ -15,7 +15,7 @@
 
         <SwitchPreference
             android:defaultValue="false"
-            android:icon="@drawable/icon_decrypt"
+            android:icon="@drawable/icon_lock_open"
             android:key="usf_decrypt"
             android:title="@string/usf_decrypt" />
         <SwitchPreference
@@ -31,7 +31,7 @@
 
         <SwitchPreference
             android:defaultValue="false"
-            android:icon="@drawable/icon_decrypt"
+            android:icon="@drawable/icon_lock_open"
             android:key="usf_keep_open"
             android:title="@string/usf_keep_open" />
 

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.4.1'
+        classpath 'com.android.tools.build:gradle:7.4.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }