SavedVolume database & Hidden volume feature

app/build.gradle

@@ -56,6 +56,6 @@ dependencies {
     implementation "com.github.bumptech.glide:glide:4.11.0"
     implementation "com.google.android.exoplayer:exoplayer-core:2.11.7"
     implementation "com.google.android.exoplayer:exoplayer-ui:2.11.7"
-    implementation "com.otaliastudios:cameraview:2.6.3"
+    implementation "com.otaliastudios:cameraview:2.6.4"
     implementation "androidx.biometric:biometric:1.0.1"
 }

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

@@ -29,25 +29,34 @@ class ChangePasswordActivity : VolumeActionActivity() {
         setContentView(R.layout.activity_change_password)
         setupActionBar()
         setupFingerprintStuff()
-        savedVolumesAdapter = SavedVolumesAdapter(this, sharedPrefs)
+        savedVolumesAdapter = SavedVolumesAdapter(this, volumeDatabase)
         if (savedVolumesAdapter.count > 0){
             saved_path_listview.adapter = savedVolumesAdapter
             saved_path_listview.onItemClickListener = OnItemClickListener { _, _, position, _ ->
-                edit_volume_path.setText(savedVolumesAdapter.getItem(position))
+                val volume = savedVolumesAdapter.getItem(position)
+                currentVolumeName = volume.name
+                if (volume.isHidden){
+                    switch_hidden_volume.isChecked = true
+                    edit_volume_name.setText(currentVolumeName)
+                } else {
+                    switch_hidden_volume.isChecked = false
+                    edit_volume_path.setText(currentVolumeName)
+                }
+                onClickSwitchHiddenVolume(switch_hidden_volume)
             }
         } else {
-            WidgetUtil.hide(saved_path_listview)
+            WidgetUtil.hideWithPadding(saved_path_listview)
         }
-        edit_volume_path.addTextChangedListener(object: TextWatcher{
+        val textWatcher = 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) {
-                if (savedVolumesAdapter.isPathSaved(s.toString())){
+                if (volumeDatabase.isVolumeSaved(s.toString())){
                     checkbox_remember_path.isEnabled = false
                     checkbox_remember_path.isChecked = false
-                    if (sharedPrefs.getString(s.toString(), null) != null){
+                    if (volumeDatabase.isHashSaved(s.toString())){
                         edit_old_password.text = null
                         edit_old_password.hint = getString(R.string.hash_saved_hint)
                         edit_old_password.isEnabled = false
@@ -61,7 +70,9 @@ class ChangePasswordActivity : VolumeActionActivity() {
                     edit_old_password.isEnabled = true
                 }
             }
-        })
+        }
+        edit_volume_path.addTextChangedListener(textWatcher)
+        edit_volume_name.addTextChangedListener(textWatcher)
         edit_new_password_confirm.setOnEditorActionListener { v, _, _ ->
             onClickChangePassword(v)
             true
@@ -102,30 +113,27 @@ class ChangePasswordActivity : VolumeActionActivity() {
     }
 
     fun onClickChangePassword(view: View?) {
-        rootCipherDir = edit_volume_path.text.toString()
+        loadVolumePath {
-        if (rootCipherDir.isEmpty()) {
+            val volumeFile = File(currentVolumePath)
-            Toast.makeText(this, R.string.enter_volume_path, Toast.LENGTH_SHORT).show()
+            if (!GocryptfsVolume.isGocryptfsVolume(volumeFile)){
-        } else {
-            val rootCipherDirFile = File(rootCipherDir)
-            if (!GocryptfsVolume.isGocryptfsVolume(rootCipherDirFile)){
                 ColoredAlertDialogBuilder(this)
                     .setTitle(R.string.error)
                     .setMessage(R.string.error_not_a_volume)
                     .setPositiveButton(R.string.ok, null)
                     .show()
-            } else if (!rootCipherDirFile.canWrite()){
+            } else if (!volumeFile.canWrite()){
                 ColoredAlertDialogBuilder(this)
                     .setTitle(R.string.warning)
                     .setMessage(R.string.change_pwd_cant_write_error_msg)
                     .setPositiveButton(R.string.ok, null)
                     .show()
             } else {
-                changePassword(null)
+                changePassword()
             }
         }
     }
 
-    private fun changePassword(givenHash: ByteArray?){
+    private fun changePassword(givenHash: ByteArray? = null){
         val newPassword = edit_new_password.text.toString().toCharArray()
         val newPasswordConfirm = edit_new_password_confirm.text.toString().toCharArray()
         if (!newPassword.contentEquals(newPasswordConfirm)) {
@@ -140,30 +148,38 @@ class ChangePasswordActivity : VolumeActionActivity() {
                     }
                     var changePasswordImmediately = true
                     if (givenHash == null) {
-                        val cipherText = sharedPrefs.getString(rootCipherDir, null)
+                        var volume: Volume? = null
-                        if (cipherText != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { //password hash saved
+                        volumeDatabase.getVolumes().forEach { testVolume ->
-                            stopTask {
+                            if (testVolume.name == currentVolumeName){
-                                loadPasswordHash(cipherText, ::changePassword)
+                                volume = testVolume
+                            }
+                        }
+                        volume?.let {
+                            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
+                                it.hash?.let { hash ->
+                                    it.iv?.let { iv ->
+                                        currentVolumePath = if (it.isHidden){
+                                            PathUtils.pathJoin(filesDir.path, it.name)
+                                        } else {
+                                            it.name
+                                        }
+                                        stopTask {
+                                            loadPasswordHash(hash, iv, ::changePassword)
+                                        }
+                                        changePasswordImmediately = false
+                                    }
+                                }
                             }
-                            changePasswordImmediately = false
                         }
                     }
                     if (changePasswordImmediately) {
-                        if (GocryptfsVolume.changePassword(
+                        if (GocryptfsVolume.changePassword(currentVolumePath, oldPassword, givenHash, newPassword, returnedHash)) {
-                                rootCipherDir,
+                            val volume = Volume(currentVolumeName, switch_hidden_volume.isChecked)
-                                oldPassword,
+                            if (volumeDatabase.isHashSaved(currentVolumeName)) {
-                                givenHash,
+                                volumeDatabase.removeHash(volume)
-                                newPassword,
-                                returnedHash
-                            )
-                        ) {
-                            if (sharedPrefs.getString(rootCipherDir, null) != null) {
-                                val editor = sharedPrefs.edit()
-                                editor.remove(rootCipherDir)
-                                editor.apply()
                             }
                             if (checkbox_remember_path.isChecked) {
-                                savedVolumesAdapter.addVolumePath(rootCipherDir)
+                                volumeDatabase.saveVolume(volume)
                             }
                             if (checkbox_save_password.isChecked && returnedHash != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                                 stopTask {

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

@@ -7,7 +7,7 @@ class ConstValues {
     companion object {
         const val creator = "DroidFS"
         const val gocryptfsConfFilename = "gocryptfs.conf"
-        const val saved_volumes_key = "saved_volumes"
+        const val volumeDatabaseName = "SavedVolumes"
         const val sort_order_key = "sort_order"
         val fakeUri: Uri = Uri.parse("fakeuri://droidfs")
         const val MAX_KERNEL_WRITE = 128*1024

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

@@ -11,10 +11,7 @@ import kotlinx.android.synthetic.main.activity_create.*
 import kotlinx.android.synthetic.main.checkboxes_section.*
 import kotlinx.android.synthetic.main.volume_path_section.*
 import sushi.hardcore.droidfs.explorers.ExplorerActivity
-import sushi.hardcore.droidfs.util.GocryptfsVolume
+import sushi.hardcore.droidfs.util.*
-import sushi.hardcore.droidfs.util.LoadingTask
-import sushi.hardcore.droidfs.util.PathUtils
-import sushi.hardcore.droidfs.util.Wiper
 import sushi.hardcore.droidfs.widgets.ColoredAlertDialogBuilder
 import java.io.File
 import java.util.*
@@ -69,10 +66,7 @@ class CreateActivity : VolumeActionActivity() {
     }
 
     fun onClickCreate(view: View?) {
-        rootCipherDir = edit_volume_path.text.toString()
+        loadVolumePath {
-        if (rootCipherDir.isEmpty()) {
-            Toast.makeText(this, R.string.enter_volume_path, Toast.LENGTH_SHORT).show()
-        } else {
             val password = edit_password.text.toString().toCharArray()
             val passwordConfirm = edit_password_confirm.text.toString().toCharArray()
             if (!password.contentEquals(passwordConfirm)) {
@@ -80,10 +74,10 @@ class CreateActivity : VolumeActionActivity() {
             } else {
                 object: LoadingTask(this, R.string.loading_msg_create){
                     override fun doTask(activity: AppCompatActivity) {
-                        val volumePathFile = File(rootCipherDir)
+                        val volumeFile = File(currentVolumePath)
                         var goodDirectory = false
-                        if (!volumePathFile.isDirectory) {
+                        if (!volumeFile.isDirectory) {
-                            if (volumePathFile.mkdirs()) {
+                            if (volumeFile.mkdirs()) {
                                 goodDirectory = true
                             } else {
                                 stopTask {
@@ -95,10 +89,10 @@ class CreateActivity : VolumeActionActivity() {
                                 }
                             }
                         } else {
-                            val dirContent = volumePathFile.list()
+                            val dirContent = volumeFile.list()
                             if (dirContent != null){
                                 if (dirContent.isEmpty()) {
-                                    if (volumePathFile.canWrite()){
+                                    if (volumeFile.canWrite()){
                                         goodDirectory = true
                                     } else {
                                         stopTask {
@@ -117,26 +111,18 @@ class CreateActivity : VolumeActionActivity() {
                             }
                         }
                         if (goodDirectory) {
-                            if (GocryptfsVolume.createVolume(rootCipherDir, password, GocryptfsVolume.ScryptDefaultLogN, ConstValues.creator)) {
+                            if (GocryptfsVolume.createVolume(currentVolumePath, password, GocryptfsVolume.ScryptDefaultLogN, ConstValues.creator)) {
                                 var returnedHash: ByteArray? = null
                                 if (checkbox_save_password.isChecked){
                                     returnedHash = ByteArray(GocryptfsVolume.KeyLen)
                                 }
-                                sessionID = GocryptfsVolume.init(rootCipherDir, password, null, returnedHash)
+                                sessionID = GocryptfsVolume.init(currentVolumePath, password, null, returnedHash)
                                 if (sessionID != -1) {
                                     if (checkbox_remember_path.isChecked) {
-                                        val oldSavedVolumesPaths = sharedPrefs.getStringSet(ConstValues.saved_volumes_key, HashSet()) as Set<String>
+                                        if (volumeDatabase.isVolumeSaved(currentVolumeName)) {
-                                        val editor = sharedPrefs.edit()
+                                            volumeDatabase.removeVolume(Volume(currentVolumeName))
-                                        val newSavedVolumesPaths = oldSavedVolumesPaths.toMutableList()
-                                        if (oldSavedVolumesPaths.contains(rootCipherDir)) {
-                                            if (sharedPrefs.getString(rootCipherDir, null) != null){
-                                                editor.remove(rootCipherDir)
-                                            }
-                                        } else {
-                                            newSavedVolumesPaths.add(rootCipherDir)
-                                            editor.putStringSet(ConstValues.saved_volumes_key, newSavedVolumesPaths.toSet())
                                         }
-                                        editor.apply()
+                                        volumeDatabase.saveVolume(Volume(currentVolumeName, switch_hidden_volume.isChecked))
                                     }
                                     if (checkbox_save_password.isChecked && returnedHash != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                                         stopTask {
@@ -178,7 +164,7 @@ class CreateActivity : VolumeActionActivity() {
                 .setPositiveButton(R.string.ok) { _, _ ->
                     val intent = Intent(applicationContext, ExplorerActivity::class.java)
                     intent.putExtra("sessionID", sessionID)
-                    intent.putExtra("volume_name", File(rootCipherDir).name)
+                    intent.putExtra("volume_name", File(currentVolumeName).name)
                     startActivity(intent)
                     finish()
                 }

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

@@ -9,7 +9,6 @@ import android.text.TextWatcher
 import android.view.MenuItem
 import android.view.View
 import android.widget.AdapterView.OnItemClickListener
-import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import kotlinx.android.synthetic.main.activity_open.*
 import kotlinx.android.synthetic.main.checkboxes_section.*
@@ -37,30 +36,46 @@ class OpenActivity : VolumeActionActivity() {
         setContentView(R.layout.activity_open)
         setupActionBar()
         setupFingerprintStuff()
-        savedVolumesAdapter = SavedVolumesAdapter(this, sharedPrefs)
+        savedVolumesAdapter = SavedVolumesAdapter(this, volumeDatabase)
         if (savedVolumesAdapter.count > 0){
             saved_path_listview.adapter = savedVolumesAdapter
             saved_path_listview.onItemClickListener = OnItemClickListener { _, _, position, _ ->
-                rootCipherDir = savedVolumesAdapter.getItem(position)
+                val volume = savedVolumesAdapter.getItem(position)
-                edit_volume_path.setText(rootCipherDir)
+                currentVolumeName = volume.name
-                val cipherText = sharedPrefs.getString(rootCipherDir, null)
+                if (volume.isHidden){
-                if (cipherText != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){ //password hash saved
+                    switch_hidden_volume.isChecked = true
-                    loadPasswordHash(cipherText, ::openUsingPasswordHash)
+                    edit_volume_name.setText(currentVolumeName)
+                } else {
+                    switch_hidden_volume.isChecked = false
+                    edit_volume_path.setText(currentVolumeName)
+                }
+                onClickSwitchHiddenVolume(switch_hidden_volume)
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
+                    volume.hash?.let { hash ->
+                        volume.iv?.let { iv ->
+                            currentVolumePath = if (volume.isHidden){
+                                PathUtils.pathJoin(filesDir.path, volume.name)
+                            } else {
+                                volume.name
+                            }
+                            loadPasswordHash(hash, iv, ::openUsingPasswordHash)
+                        }
+                    }
                 }
             }
         } else {
-            WidgetUtil.hide(saved_path_listview)
+            WidgetUtil.hideWithPadding(saved_path_listview)
         }
-        edit_volume_path.addTextChangedListener(object: TextWatcher {
+        val textWatcher = 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) {
-                if (savedVolumesAdapter.isPathSaved(s.toString())){
+                if (volumeDatabase.isVolumeSaved(s.toString())){
                     checkbox_remember_path.isEnabled = false
                     checkbox_remember_path.isChecked = false
-                    if (sharedPrefs.getString(s.toString(), null) != null){
+                    if (volumeDatabase.isHashSaved(s.toString())){
                         checkbox_save_password.isEnabled = false
                         checkbox_save_password.isChecked = false
                     } else {
@@ -71,7 +86,9 @@ class OpenActivity : VolumeActionActivity() {
                     checkbox_save_password.isEnabled = true
                 }
             }
-        })
+        }
+        edit_volume_path.addTextChangedListener(textWatcher)
+        edit_volume_name.addTextChangedListener(textWatcher)
         edit_password.setOnEditorActionListener { v, _, _ ->
             onClickOpen(v)
             true
@@ -116,24 +133,15 @@ class OpenActivity : VolumeActionActivity() {
     }
 
     fun onClickOpen(view: View?) {
-        rootCipherDir = edit_volume_path.text.toString()
+        loadVolumePath {
-        if (rootCipherDir.isEmpty()) {
+            val volumeFile = File(currentVolumePath)
-            Toast.makeText(this, R.string.enter_volume_path, Toast.LENGTH_SHORT).show()
+            if (!GocryptfsVolume.isGocryptfsVolume(volumeFile)){
-        } else {
-            val rootCipherDirFile = File(rootCipherDir)
-            if (!rootCipherDirFile.canRead()) {
-                ColoredAlertDialogBuilder(this)
-                    .setTitle(R.string.error)
-                    .setMessage(R.string.open_cant_read_error)
-                    .setPositiveButton(R.string.ok, null)
-                    .show()
-            } else if (!GocryptfsVolume.isGocryptfsVolume(rootCipherDirFile)){
                 ColoredAlertDialogBuilder(this)
                     .setTitle(R.string.error)
                     .setMessage(R.string.error_not_a_volume)
                     .setPositiveButton(R.string.ok, null)
                     .show()
-            } else if (!rootCipherDirFile.canWrite()) {
+            } else if (!volumeFile.canWrite()) {
                 if ((intent.action == Intent.ACTION_SEND || intent.action == Intent.ACTION_SEND_MULTIPLE) && intent.extras != null) { //import via android share menu
                     ColoredAlertDialogBuilder(this)
                         .setTitle(R.string.error)
@@ -145,7 +153,7 @@ class OpenActivity : VolumeActionActivity() {
                         .setTitle(R.string.warning)
                         .setCancelable(false)
                         .setPositiveButton(R.string.ok) { _, _ -> openVolume() }
-                    if (PathUtils.isPathOnExternalStorage(rootCipherDir, this)){
+                    if (PathUtils.isPathOnExternalStorage(currentVolumeName, this)){
                         dialog.setMessage(R.string.open_on_sdcard_warning)
                     } else {
                         dialog.setMessage(R.string.open_cant_write_warning)
@@ -166,10 +174,10 @@ class OpenActivity : VolumeActionActivity() {
                 if (checkbox_save_password.isChecked){
                     returnedHash = ByteArray(GocryptfsVolume.KeyLen)
                 }
-                sessionID = GocryptfsVolume.init(rootCipherDir, password, null, returnedHash)
+                sessionID = GocryptfsVolume.init(currentVolumePath, password, null, returnedHash)
                 if (sessionID != -1) {
                     if (checkbox_remember_path.isChecked) {
-                        savedVolumesAdapter.addVolumePath(rootCipherDir)
+                        volumeDatabase.saveVolume(Volume(currentVolumeName, switch_hidden_volume.isChecked))
                     }
                     if (checkbox_save_password.isChecked && returnedHash != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
                             stopTask {
@@ -201,7 +209,7 @@ class OpenActivity : VolumeActionActivity() {
     private fun openUsingPasswordHash(passwordHash: ByteArray){
         object : LoadingTask(this, R.string.loading_msg_open){
             override fun doTask(activity: AppCompatActivity) {
-                sessionID = GocryptfsVolume.init(rootCipherDir, null, passwordHash, null)
+                sessionID = GocryptfsVolume.init(currentVolumePath, null, passwordHash, null)
                 if (sessionID != -1){
                     stopTask { startExplorer() }
                 } else {
@@ -236,7 +244,7 @@ class OpenActivity : VolumeActionActivity() {
             explorerIntent = Intent(this, ExplorerActivity::class.java) //default opening
         }
         explorerIntent.putExtra("sessionID", sessionID)
-        explorerIntent.putExtra("volume_name", File(rootCipherDir).name)
+        explorerIntent.putExtra("volume_name", File(currentVolumeName).name)
         startActivity(explorerIntent)
         isFinishingIntentionally = true
         finish()

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

@@ -0,0 +1,3 @@
+package sushi.hardcore.droidfs
+
+class Volume(val name: String, val isHidden: Boolean = false, var hash: ByteArray? = null, var iv: ByteArray? = null)

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

@@ -6,8 +6,8 @@ import android.os.Build
 import android.security.keystore.KeyGenParameterSpec
 import android.security.keystore.KeyPermanentlyInvalidatedException
 import android.security.keystore.KeyProperties
-import android.util.Base64
 import android.view.View
+import android.widget.LinearLayout
 import android.widget.Toast
 import androidx.annotation.RequiresApi
 import androidx.biometric.BiometricManager
@@ -15,6 +15,8 @@ import androidx.biometric.BiometricPrompt
 import androidx.core.content.ContextCompat
 import kotlinx.android.synthetic.main.checkboxes_section.*
 import kotlinx.android.synthetic.main.toolbar.*
+import kotlinx.android.synthetic.main.volume_path_section.*
+import sushi.hardcore.droidfs.util.PathUtils
 import sushi.hardcore.droidfs.util.WidgetUtil
 import sushi.hardcore.droidfs.widgets.ColoredAlertDialogBuilder
 import java.security.KeyStore
@@ -22,7 +24,9 @@ import javax.crypto.*
 import javax.crypto.spec.GCMParameterSpec
 
 open class VolumeActionActivity : BaseActivity() {
-    protected lateinit var rootCipherDir: String
+    protected lateinit var currentVolumeName: String
+    protected lateinit var currentVolumePath: String
+    protected lateinit var volumeDatabase: VolumeDatabase
     private var usf_fingerprint = false
     private var biometricCanAuthenticateCode: Int = -1
     private lateinit var biometricManager: BiometricManager
@@ -30,10 +34,13 @@ open class VolumeActionActivity : BaseActivity() {
     private lateinit var keyStore: KeyStore
     private lateinit var key: SecretKey
     private lateinit var cipher: Cipher
+    private var isCipherReady = false
     private var actionMode: Int? = null
     private lateinit var onAuthenticationResult: (success: Boolean) -> Unit
     private lateinit var onPasswordDecrypted: (password: ByteArray) -> Unit
     private lateinit var dataToProcess: ByteArray
+    private lateinit var originalHiddenVolumeSectionLayoutParams: LinearLayout.LayoutParams
+    private lateinit var originalNormalVolumeSectionLayoutParams: LinearLayout.LayoutParams
     companion object {
         private const val ANDROID_KEY_STORE = "AndroidKeyStore"
         private const val KEY_ALIAS = "Hash Key"
@@ -42,6 +49,10 @@ open class VolumeActionActivity : BaseActivity() {
     }
 
     protected fun setupFingerprintStuff(){
+        originalHiddenVolumeSectionLayoutParams = hidden_volume_section.layoutParams as LinearLayout.LayoutParams
+        originalNormalVolumeSectionLayoutParams = normal_volume_section.layoutParams as LinearLayout.LayoutParams
+        WidgetUtil.hide(hidden_volume_section)
+        volumeDatabase = VolumeDatabase(this)
         usf_fingerprint = sharedPrefs.getBoolean("usf_fingerprint", false)
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && usf_fingerprint) {
             biometricManager = BiometricManager.from(this)
@@ -73,12 +84,7 @@ open class VolumeActionActivity : BaseActivity() {
                                 when (actionMode) {
                                     Cipher.ENCRYPT_MODE -> {
                                         val cipherText = cipherObject.doFinal(dataToProcess)
-                                        val encodedCipherText = Base64.encodeToString(cipherText, 0)
+                                        success = volumeDatabase.addHash(Volume(currentVolumeName, switch_hidden_volume.isChecked, cipherText, cipherObject.iv))
-                                        val encodedIv = Base64.encodeToString(cipherObject.iv, 0)
-                                        val sharedPrefsEditor = sharedPrefs.edit()
-                                        sharedPrefsEditor.putString(rootCipherDir, "$encodedIv:$encodedCipherText")
-                                        sharedPrefsEditor.apply()
-                                        success = true
                                     }
                                     Cipher.DECRYPT_MODE -> {
                                         try {
@@ -117,7 +123,7 @@ open class VolumeActionActivity : BaseActivity() {
                 biometricPrompt = BiometricPrompt(this, executor, callback)
             }
         } else {
-            WidgetUtil.hide(checkbox_save_password)
+            WidgetUtil.hideWithPadding(checkbox_save_password)
         }
     }
 
@@ -182,6 +188,7 @@ open class VolumeActionActivity : BaseActivity() {
             keyGenerator.generateKey()
         }
         cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES+"/"+KeyProperties.BLOCK_MODE_GCM+"/"+KeyProperties.ENCRYPTION_PADDING_NONE)
+        isCipherReady = true
     }
 
     private fun alertKeyPermanentlyInvalidatedException(){
@@ -198,14 +205,14 @@ open class VolumeActionActivity : BaseActivity() {
     @RequiresApi(Build.VERSION_CODES.M)
     protected fun savePasswordHash(plainText: ByteArray, onAuthenticationResult: (success: Boolean) -> Unit){
         val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()
-            .setTitle(rootCipherDir)
+            .setTitle(currentVolumeName)
             .setSubtitle(getString(R.string.encrypt_action_description))
             .setDescription(getString(R.string.fingerprint_instruction))
             .setNegativeButtonText(getString(R.string.cancel))
             .setDeviceCredentialAllowed(false)
             .setConfirmationRequired(false)
             .build()
-        if (!::cipher.isInitialized){
+        if (!isCipherReady){
             prepareCipher()
         }
         actionMode = Cipher.ENCRYPT_MODE
@@ -220,9 +227,9 @@ open class VolumeActionActivity : BaseActivity() {
     }
 
     @RequiresApi(Build.VERSION_CODES.M)
-    protected fun loadPasswordHash(cipherText: String, onPasswordDecrypted: (password: ByteArray) -> Unit){
+    protected fun loadPasswordHash(cipherText: ByteArray, iv: ByteArray, onPasswordDecrypted: (password: ByteArray) -> Unit){
         val biometricPromptInfo = BiometricPrompt.PromptInfo.Builder()
-            .setTitle(rootCipherDir)
+            .setTitle(currentVolumeName)
             .setSubtitle(getString(R.string.decrypt_action_description))
             .setDescription(getString(R.string.fingerprint_instruction))
             .setNegativeButtonText(getString(R.string.cancel))
@@ -231,12 +238,10 @@ open class VolumeActionActivity : BaseActivity() {
             .build()
         this.onPasswordDecrypted = onPasswordDecrypted
         actionMode = Cipher.DECRYPT_MODE
-        if (!::cipher.isInitialized){
+        if (!isCipherReady){
             prepareCipher()
         }
-        val encodedElements = cipherText.split(":")
+        dataToProcess = cipherText
-        dataToProcess = Base64.decode(encodedElements[1], 0)
-        val iv = Base64.decode(encodedElements[0], 0)
         val gcmSpec = GCMParameterSpec(GCM_TAG_LEN, iv)
         try {
             cipher.init(Cipher.DECRYPT_MODE, key, gcmSpec)
@@ -248,15 +253,40 @@ open class VolumeActionActivity : BaseActivity() {
 
     private fun resetHashStorage() {
         keyStore.deleteEntry(KEY_ALIAS)
-        val savedVolumePaths = sharedPrefs.getStringSet(ConstValues.saved_volumes_key, HashSet<String>()) as Set<String>
+        volumeDatabase.getVolumes().forEach { volume ->
-        val sharedPrefsEditor = sharedPrefs.edit()
+            volumeDatabase.removeHash(volume)
-        for (path in savedVolumePaths){
-            val savedHash = sharedPrefs.getString(path, null)
-            if (savedHash != null){
-                sharedPrefsEditor.remove(path)
-            }
         }
-        sharedPrefsEditor.apply()
+        isCipherReady = false
         Toast.makeText(this, R.string.hash_storage_reset, Toast.LENGTH_SHORT).show()
     }
+
+    protected fun loadVolumePath(callback: () -> Unit){
+        currentVolumeName = if (switch_hidden_volume.isChecked){
+            edit_volume_name.text.toString()
+        } else {
+            edit_volume_path.text.toString()
+        }
+        if (currentVolumeName.isEmpty()) {
+            Toast.makeText(this, if (switch_hidden_volume.isChecked) {R.string.enter_volume_name} else {R.string.enter_volume_path}, Toast.LENGTH_SHORT).show()
+        } else if (switch_hidden_volume.isChecked && currentVolumeName.contains("/")){
+            Toast.makeText(this, R.string.error_slash_in_name, Toast.LENGTH_SHORT).show()
+        } else {
+            currentVolumePath = if (switch_hidden_volume.isChecked) {
+                PathUtils.pathJoin(filesDir.path, currentVolumeName)
+            } else {
+                currentVolumeName
+            }
+            callback()
+        }
+    }
+
+    fun onClickSwitchHiddenVolume(view: View){
+        if (switch_hidden_volume.isChecked){
+            WidgetUtil.show(hidden_volume_section, originalHiddenVolumeSectionLayoutParams)
+            WidgetUtil.hide(normal_volume_section)
+        } else {
+            WidgetUtil.show(normal_volume_section, originalNormalVolumeSectionLayoutParams)
+            WidgetUtil.hide(hidden_volume_section)
+        }
+    }
 }

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

@@ -0,0 +1,96 @@
+package sushi.hardcore.droidfs
+
+import android.content.ContentValues
+import android.content.Context
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteOpenHelper
+
+class VolumeDatabase(context: Context): SQLiteOpenHelper(context,
+    ConstValues.volumeDatabaseName, null, 3) {
+    companion object {
+        const val TABLE_NAME = "Volumes"
+        const val COLUMN_NAME = "name"
+        const val COLUMN_HIDDEN = "hidden"
+        const val COLUMN_HASH = "hash"
+        const val COLUMN_IV = "iv"
+
+        private fun contentValuesFromVolume(volume: Volume): ContentValues {
+            val contentValues = ContentValues()
+            contentValues.put(COLUMN_NAME, volume.name)
+            contentValues.put(COLUMN_HIDDEN, volume.isHidden)
+            contentValues.put(COLUMN_HASH, volume.hash)
+            contentValues.put(COLUMN_IV, volume.iv)
+            return contentValues
+        }
+    }
+    override fun onCreate(db: SQLiteDatabase) {
+        db.execSQL(
+            "CREATE TABLE IF NOT EXISTS $TABLE_NAME ($COLUMN_NAME TEXT PRIMARY KEY, $COLUMN_HIDDEN SHORT, $COLUMN_HASH BLOB, $COLUMN_IV BLOB);"
+        )
+    }
+
+    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {}
+
+    fun isVolumeSaved(volumeName: String): Boolean {
+        val cursor = readableDatabase.query(TABLE_NAME, arrayOf(COLUMN_NAME), "$COLUMN_NAME=?", arrayOf(volumeName), null, null, null)
+        val result = cursor.count > 0
+        cursor.close()
+        return result
+    }
+
+    fun saveVolume(volume: Volume): Boolean {
+        if (!isVolumeSaved(volume.name)){
+            return (writableDatabase.insert(TABLE_NAME, null, contentValuesFromVolume(volume)) == 0.toLong())
+        }
+        return false
+    }
+
+    fun getVolumes(): List<Volume> {
+        val list: MutableList<Volume> = ArrayList()
+        val cursor = readableDatabase.rawQuery("SELECT * FROM $TABLE_NAME", null)
+        while (cursor.moveToNext()){
+            list.add(
+                Volume(
+                    cursor.getString(cursor.getColumnIndex(COLUMN_NAME)),
+                    cursor.getShort(cursor.getColumnIndex(COLUMN_HIDDEN)) == 1.toShort(),
+                    cursor.getBlob(cursor.getColumnIndex(COLUMN_HASH)),
+                    cursor.getBlob(cursor.getColumnIndex(COLUMN_IV))
+                )
+            )
+        }
+        cursor.close()
+        return list
+    }
+
+    fun isHashSaved(volumeName: String): Boolean {
+        val cursor = readableDatabase.query(TABLE_NAME, arrayOf(COLUMN_NAME, COLUMN_HASH), "$COLUMN_NAME=?", arrayOf(volumeName), null, null, null)
+        var isHashSaved = false
+        if (cursor.moveToNext()){
+            if (cursor.getBlob(cursor.getColumnIndex(COLUMN_HASH)) != null){
+                isHashSaved = true
+            }
+        }
+        cursor.close()
+        return isHashSaved
+    }
+
+    fun addHash(volume: Volume): Boolean {
+        return writableDatabase.update(TABLE_NAME, contentValuesFromVolume(volume), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
+    }
+
+    fun removeHash(volume: Volume): Boolean {
+        return writableDatabase.update(
+            TABLE_NAME, contentValuesFromVolume(
+            Volume(
+                volume.name,
+                volume.isHidden,
+                null,
+                null
+            )
+        ), "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
+    }
+
+    fun removeVolume(volume: Volume): Boolean {
+        return writableDatabase.delete(TABLE_NAME, "$COLUMN_NAME=?", arrayOf(volume.name)) > 0
+    }
+}

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

@@ -1,86 +1,99 @@
 package sushi.hardcore.droidfs.adapters
 
 import android.content.Context
-import android.content.SharedPreferences
-import android.content.SharedPreferences.Editor
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.BaseAdapter
 import android.widget.ImageView
 import android.widget.TextView
-import sushi.hardcore.droidfs.ConstValues
 import sushi.hardcore.droidfs.R
+import sushi.hardcore.droidfs.util.PathUtils
+import sushi.hardcore.droidfs.Volume
+import sushi.hardcore.droidfs.VolumeDatabase
 import sushi.hardcore.droidfs.util.WidgetUtil
 import sushi.hardcore.droidfs.widgets.ColoredAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.NonScrollableColoredBorderListView
-import java.util.*
+import java.io.File
 
-class SavedVolumesAdapter(val context: Context, private val sharedPrefs: SharedPreferences) : BaseAdapter() {
+class SavedVolumesAdapter(private val context: Context, private val volumeDatabase: VolumeDatabase) : BaseAdapter() {
     private val inflater: LayoutInflater = LayoutInflater.from(context)
     private lateinit var nonScrollableColoredBorderListView: NonScrollableColoredBorderListView
-    private val savedVolumesPaths: MutableList<String> = ArrayList()
-    private val sharedPrefsEditor: Editor = sharedPrefs.edit()
-
-    init {
-        val savedVolumesPathsSet = sharedPrefs.getStringSet(ConstValues.saved_volumes_key, HashSet()) as Set<String>
-        for (volume_path in savedVolumesPathsSet) {
-            savedVolumesPaths.add(volume_path)
-        }
-    }
-
-    private fun updateSharedPrefs() {
-        val savedVolumesPathsSet = savedVolumesPaths.toSet()
-        sharedPrefsEditor.remove(ConstValues.saved_volumes_key)
-        sharedPrefsEditor.putStringSet(ConstValues.saved_volumes_key, savedVolumesPathsSet)
-        sharedPrefsEditor.apply()
-    }
 
     override fun getCount(): Int {
-        return savedVolumesPaths.size
+        return volumeDatabase.getVolumes().size
     }
 
-    override fun getItem(position: Int): String {
+    override fun getItem(position: Int): Volume {
-        return savedVolumesPaths[position]
+        return volumeDatabase.getVolumes()[position]
     }
 
     override fun getItemId(position: Int): Long {
         return 0
     }
 
+    private fun deletePasswordHash(volume: Volume){
+        volumeDatabase.removeHash(volume)
+        volume.hash = null
+        volume.iv = null
+    }
+
+    private fun deleteVolumeData(volume: Volume, parent: ViewGroup){
+        volumeDatabase.removeVolume(volume)
+        refresh(parent)
+    }
+
     override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
         if (!::nonScrollableColoredBorderListView.isInitialized){
             nonScrollableColoredBorderListView = parent as NonScrollableColoredBorderListView
         }
         val view: View = convertView ?: inflater.inflate(R.layout.adapter_saved_volume, parent, false)
-        val volumeNameTextview = view.findViewById<TextView>(R.id.volume_name_textview)
+        val volumeNameTextView = view.findViewById<TextView>(R.id.volume_name_textview)
         val currentVolume = getItem(position)
-        volumeNameTextview.text = currentVolume
+        volumeNameTextView.text = currentVolume.name
-        val deleteImageview = view.findViewById<ImageView>(R.id.delete_imageview)
+        val deleteImageView = view.findViewById<ImageView>(R.id.delete_imageview)
-        deleteImageview.setOnClickListener {
+        deleteImageView.setOnClickListener {
-            val volumePath = savedVolumesPaths[position]
             val dialog = ColoredAlertDialogBuilder(context)
             dialog.setTitle(R.string.warning)
-            if (sharedPrefs.getString(volumePath, null) != null){
+            if (currentVolume.isHidden){
-                dialog.setMessage(context.getString(R.string.delete_hash_or_all))
+                if (currentVolume.hash != null) {
-                dialog.setPositiveButton(context.getString(R.string.delete_all)) { _, _ ->
+                    dialog.setMessage(R.string.hidden_volume_delete_question_hash)
-                    savedVolumesPaths.removeAt(position)
+                    dialog.setPositiveButton(R.string.password_hash){ _, _ ->
-                    sharedPrefsEditor.remove(volumePath)
+                        deletePasswordHash(currentVolume)
-                    updateSharedPrefs()
+                    }
-                    refresh(parent)
+                    dialog.setNegativeButton(R.string.password_hash_and_path){ _, _ ->
-                }
+                        deleteVolumeData(currentVolume, parent)
-                dialog.setNegativeButton(context.getString(R.string.delete_hash)) { _, _ ->
+                    }
-                    sharedPrefsEditor.remove(volumePath)
+                    dialog.setNeutralButton(R.string.whole_volume){ _, _ ->
-                    sharedPrefsEditor.apply()
+                        PathUtils.recursiveRemoveDirectory(File(PathUtils.pathJoin(context.filesDir.path, currentVolume.name)))
+                        deleteVolumeData(currentVolume, parent)
+                    }
+                } else {
+                    dialog.setMessage(R.string.hidden_volume_delete_question)
+                    dialog.setPositiveButton(R.string.path_only){ _, _ ->
+                        deleteVolumeData(currentVolume, parent)
+                    }
+                    dialog.setNegativeButton(R.string.whole_volume){ _, _ ->
+                        PathUtils.recursiveRemoveDirectory(File(PathUtils.pathJoin(context.filesDir.path, currentVolume.name)))
+                        deleteVolumeData(currentVolume, parent)
+                    }
                 }
             } else {
-                dialog.setMessage(context.getString(R.string.ask_delete_volume_path))
+                if (currentVolume.hash != null) {
-                dialog.setPositiveButton(R.string.ok) {_, _ ->
+                    dialog.setMessage(R.string.delete_hash_or_all)
-                    savedVolumesPaths.removeAt(position)
+                    dialog.setNegativeButton(R.string.password_hash_and_path) { _, _ ->
-                    updateSharedPrefs()
+                        deleteVolumeData(currentVolume, parent)
-                    refresh(parent)
+                    }
+                    dialog.setPositiveButton(R.string.password_hash) { _, _ ->
+                        deletePasswordHash(currentVolume)
+                    }
+                } else {
+                    dialog.setMessage(R.string.ask_delete_volume_path)
+                    dialog.setPositiveButton(R.string.ok) {_, _ ->
+                        deleteVolumeData(currentVolume, parent)
+                    }
+                    dialog.setNegativeButton(R.string.cancel, null)
                 }
-                dialog.setNegativeButton(R.string.cancel, null)
             }
             dialog.show()
         }
@@ -90,20 +103,9 @@ class SavedVolumesAdapter(val context: Context, private val sharedPrefs: SharedP
     private fun refresh(parent: ViewGroup) {
         notifyDataSetChanged()
         if (count == 0){
-            WidgetUtil.hide(parent)
+            WidgetUtil.hideWithPadding(parent)
         } else {
             nonScrollableColoredBorderListView.layoutParams.height = nonScrollableColoredBorderListView.computeHeight()
         }
     }
-
-    fun isPathSaved(volume_path: String): Boolean {
-        return savedVolumesPaths.contains(volume_path)
-    }
-
-    fun addVolumePath(volume_path: String) {
-        if (!isPathSaved(volume_path)) {
-            savedVolumesPaths.add(volume_path)
-            updateSharedPrefs()
-        }
-    }
 }

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

@@ -160,4 +160,19 @@ object PathUtils {
         val split: Array<String?> = docId.split(":").toTypedArray()
         return if (split.size >= 2 && split[1] != null) split[1] else File.separator
     }
+
+    fun recursiveRemoveDirectory(rootDirectory: File): Boolean {
+        rootDirectory.listFiles()?.forEach { item ->
+            if (item.isDirectory) {
+                if (!recursiveRemoveDirectory(item)){
+                    return false
+                }
+            } else {
+                if (!item.delete()) {
+                    return false
+                }
+            }
+        }
+        return rootDirectory.delete()
+    }
 }

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

@@ -1,13 +1,20 @@
 package sushi.hardcore.droidfs.util
 
 import android.view.View
-import android.view.ViewGroup
 import android.widget.LinearLayout
 
 object WidgetUtil {
-    fun hide(view: View){
+    fun hideWithPadding(view: View){
         view.visibility = View.INVISIBLE
         view.setPadding(0, 0, 0, 0)
         view.layoutParams = LinearLayout.LayoutParams(0, 0)
     }
+    fun hide(view: View){
+        view.visibility = View.INVISIBLE
+        view.layoutParams = LinearLayout.LayoutParams(0, 0)
+    }
+    fun show(view: View, layoutParams: LinearLayout.LayoutParams){
+        view.visibility = View.VISIBLE
+        view.layoutParams = layoutParams
+    }
 }

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

@@ -1,29 +1,69 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
+    android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:orientation="vertical">
 
-    <TextView
+    <androidx.appcompat.widget.SwitchCompat
-        android:layout_width="@dimen/create_activity_label_width"
+        android:id="@+id/switch_hidden_volume"
-        android:layout_height="match_parent"
+        android:layout_width="wrap_content"
-        android:gravity="center_vertical"
-        android:text="@string/volume_path"
-        android:textSize="@dimen/edit_text_label_text_size" />
-
-    <sushi.hardcore.droidfs.widgets.ColoredEditText
-        android:id="@+id/edit_volume_path"
-        android:layout_width="0dp"
-        android:layout_weight="0.5"
         android:layout_height="wrap_content"
-        android:inputType="text"
+        android:text="@string/hidden_volume"
-        android:maxLines="1"/>
+        app:switchPadding="10dp"
+        android:layout_gravity="center_horizontal"
+        android:onClick="onClickSwitchHiddenVolume"/>
 
-    <sushi.hardcore.droidfs.widgets.ColoredImageButton
+    <LinearLayout
-        android:layout_width="@dimen/image_button_size"
+        android:id="@+id/normal_volume_section"
-        android:layout_height="@dimen/image_button_size"
+        android:layout_width="match_parent"
-        android:onClick="pickDirectory"
+        android:layout_height="match_parent">
-        android:scaleType="fitCenter"
+
-        android:background="#00000000"
+        <TextView
-        android:src="@drawable/icon_folder" />
+            android:layout_width="@dimen/create_activity_label_width"
+            android:layout_height="match_parent"
+            android:gravity="center_vertical"
+            android:text="@string/volume_path"
+            android:textSize="@dimen/edit_text_label_text_size" />
+
+        <sushi.hardcore.droidfs.widgets.ColoredEditText
+            android:id="@+id/edit_volume_path"
+            android:layout_width="0dp"
+            android:layout_weight="0.5"
+            android:layout_height="wrap_content"
+            android:inputType="text"
+            android:maxLines="1"/>
+
+        <sushi.hardcore.droidfs.widgets.ColoredImageButton
+            android:layout_width="@dimen/image_button_size"
+            android:layout_height="@dimen/image_button_size"
+            android:onClick="pickDirectory"
+            android:scaleType="fitCenter"
+            android:background="#00000000"
+            android:src="@drawable/icon_folder" />
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:id="@+id/hidden_volume_section"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <TextView
+            android:layout_width="@dimen/create_activity_label_width"
+            android:layout_height="match_parent"
+            android:gravity="center_vertical"
+            android:text="@string/volume_name"
+            android:textSize="@dimen/edit_text_label_text_size" />
+
+        <sushi.hardcore.droidfs.widgets.ColoredEditText
+            android:id="@+id/edit_volume_name"
+            android:layout_width="0dp"
+            android:layout_weight="0.5"
+            android:layout_height="wrap_content"
+            android:inputType="text"
+            android:maxLines="1"/>
+
+    </LinearLayout>
 
 </LinearLayout>

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

@@ -9,6 +9,7 @@
     <string name="password">Password:</string>
     <string name="password_confirm">Password (confirmation):</string>
     <string name="volume_path">Volume Path:</string>
+    <string name="volume_name">Volume Name:</string>
     <string name="import_files">Import/Encrypt files</string>
     <string name="mkdir">Create folder</string>
     <string name="dir_empty">Directory Empty</string>
@@ -42,6 +43,7 @@
     <string name="get_size_failed">Failed to retrieve file size.</string>
     <string name="parent_folder">Parent Folder</string>
     <string name="enter_volume_path">Please enter the volume path</string>
+    <string name="enter_volume_name">Please enter the volume name</string>
     <string name="external_open">Open with external app</string>
     <string name="single_delete_confirm">Are you sure you want to delete %s ?</string>
     <string name="multiple_delete_confirm">Are you sure you want to delete these %s items ?</string>
@@ -76,10 +78,14 @@
     <string name="fingerprint_instruction">Please touch the fingerprint sensor</string>
     <string name="open_failed_hash_msg">Failed to open the volume. The password may have changed.</string>
     <string name="authentication_failed">Authentication failed</string>
-    <string name="delete_hash_or_all">Delete only password hash or all saved volume data ? (This won\'t delete the volume itself)</string>
+    <string name="delete_hash_or_all">Delete only the password hash or the password hash and the saved path ? (This won\'t delete the volume itself)</string>
-    <string name="delete_all">Delete all</string>
+    <string name="password_hash_and_path">Password hash and path</string>
-    <string name="delete_hash">Delete password hash</string>
+    <string name="password_hash">Password hash</string>
     <string name="ask_delete_volume_path">Are you sure you want to forget this volume path ? (This won\'t delete the volume itself)</string>
+    <string name="hidden_volume_delete_question_hash">Delete only the password hash, the password hash and the saved path, or the WHOLE volume (including its content) ?</string>
+    <string name="whole_volume">Whole volume</string>
+    <string name="hidden_volume_delete_question">Delete only the path or the whole volume ITSELF (including its content) ?</string>
+    <string name="path_only">Path only</string>
     <string name="illegal_block_size_exception">IllegalBlockSizeException</string>
     <string name="illegal_block_size_exception_msg">This can happen if you have added a new fingerprint. Resetting hash storage can solve this problem.</string>
     <string name="reset_hash_storage">Reset hash storage</string>
@@ -167,7 +173,6 @@
     <string name="open_on_sdcard_warning">DroidFS can\'t write on removable SD cards. Opening volume with read-only access.</string>
     <string name="open_cant_write_warning">DroidFS doesn\'t have write access to this path. Opening volume with read-only access.</string>
     <string name="open_cant_write_error_msg">DroidFS doesn\'t have write access to this path. Please try another volume.</string>
-    <string name="open_cant_read_error">DroidFS doesn\'t have read access to this path. You can try to move the volume to a readable location.</string>
     <string name="change_pwd_cant_write_error_msg">DroidFS doesn\'t have write access to this path. You can try to move the volume to a writable location.</string>
     <string name="change_pwd_on_sdcard_error_msg">DroidFS can\'t write on removable SD cards, please move the volume to internal storage.</string>
     <string name="slideshow_stopped">Slideshow stopped</string>
@@ -185,4 +190,6 @@
     <string name="usf_read_doc">You should read it carefully before enabling any of these options.</string>
     <string name="usf_doc">Unsafe features documentation</string>
     <string name="error_retrieving_filename">Unable to retrieve file name for URI: %s</string>
+    <string name="hidden_volume">Hidden Volume</string>
+    <string name="error_slash_in_name">Volume name cannot contain slashes</string>
 </resources>

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

@@ -1,63 +1,61 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
-    <PreferenceCategory
+    <PreferenceCategory android:title="@string/ui">
-        android:title="@string/ui">
 
         <SwitchPreference
+            android:defaultValue="false"
             android:icon="@drawable/icon_screenshot"
             android:key="usf_screenshot"
-            android:title="@string/usf_screenshot"
+            android:title="@string/usf_screenshot" />
-            android:defaultValue="false"/>
 
     </PreferenceCategory>
 
-    <PreferenceCategory
+    <PreferenceCategory android:title="@string/explorer">
-        android:title="@string/explorer">
 
         <SwitchPreference
-            android:icon="@drawable/icon_open_in_new"
+            android:defaultValue="false"
-            android:key="usf_open"
-            android:title="@string/usf_open"
-            android:defaultValue="false"/>
-        <SwitchPreference
             android:icon="@drawable/icon_decrypt"
             android:key="usf_decrypt"
-            android:title="@string/usf_decrypt"
+            android:title="@string/usf_decrypt" />
-            android:defaultValue="false"/>
         <SwitchPreference
+            android:defaultValue="false"
+            android:icon="@drawable/icon_open_in_new"
+            android:key="usf_open"
+            android:title="@string/usf_open" />
+        <SwitchPreference
+            android:defaultValue="false"
             android:icon="@drawable/icon_share"
             android:key="usf_share"
-            android:title="@string/usf_share"
+            android:title="@string/usf_share" />
-            android:defaultValue="false"/>
 
         <SwitchPreference
+            android:defaultValue="false"
             android:icon="@drawable/icon_decrypt"
             android:key="usf_keep_open"
-            android:title="@string/usf_keep_open"
+            android:title="@string/usf_keep_open" />
-            android:defaultValue="false"/>
 
     </PreferenceCategory>
 
-    <PreferenceCategory
+    <PreferenceCategory android:title="@string/usf_volume_management">
-        android:title="@string/usf_volume_management">
 
         <SwitchPreference
+            android:defaultValue="false"
             android:icon="@drawable/icon_fingerprint"
             android:key="usf_fingerprint"
-            android:title="@string/usf_fingerprint"
+            android:title="@string/usf_fingerprint" />
-            android:defaultValue="false"/>
 
     </PreferenceCategory>
 
-    <PreferenceCategory
+    <PreferenceCategory android:title="@string/about">
-        android:title="@string/about">
 
         <Preference
-            android:title="@string/usf_doc"
+            android:icon="@drawable/icon_notes"
             android:summary="@string/usf_read_doc"
-            android:icon="@drawable/icon_notes">
+            android:title="@string/usf_doc">
-            <intent android:action="android.intent.action.VIEW" android:data="https://github.com/hardcore-sushi/DroidFS#unsafe-features"/>
+            <intent
+                android:action="android.intent.action.VIEW"
+                android:data="https://github.com/hardcore-sushi/DroidFS#unsafe-features" />
         </Preference>
 
     </PreferenceCategory>