Fix delete icon color bug

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

@@ -91,7 +91,7 @@ class CameraActivity : BaseActivity(), SensorOrientationListener.Listener {
         usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         binding = ActivityCameraBinding.inflate(layoutInflater)
         setContentView(binding.root)
-        gocryptfsVolume = GocryptfsVolume(intent.getIntExtra("sessionID", -1))
+        gocryptfsVolume = GocryptfsVolume(applicationContext, intent.getIntExtra("sessionID", -1))
         outputDirectory = intent.getStringExtra("path")!!
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

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

@@ -38,14 +38,5 @@ class ConstValues {
         fun isText(path: String): Boolean {
             return isExtensionType("text", path)
         }
-        fun getAssociatedDrawable(path: String): Int {
-            return when {
-                isAudio(path) -> R.drawable.icon_file_audio
-                isImage(path) -> R.drawable.icon_file_image
-                isVideo(path) -> R.drawable.icon_file_video
-                isText(path) -> R.drawable.icon_file_text
-                else -> R.drawable.icon_file_unknown
-            }
-        }
     }
 }

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

@@ -167,7 +167,7 @@ class CreateActivity : VolumeActionActivity() {
         super.onPause()
         //Closing volume if leaving activity while showing dialog
         if (sessionID != -1 && !isStartingExplorer) {
-            GocryptfsVolume(sessionID).close()
+            GocryptfsVolume(applicationContext, sessionID).close()
             finish()
         }
     }

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

@@ -9,7 +9,7 @@ import java.io.FileOutputStream
 import java.io.InputStream
 import java.io.OutputStream
 
-class GocryptfsVolume(var sessionID: Int) {
+class GocryptfsVolume(val applicationContext: Context, var sessionID: Int) {
     private external fun native_close(sessionID: Int)
     private external fun native_is_closed(sessionID: Int): Boolean
     private external fun native_list_dir(sessionID: Int, dir_path: String): MutableList<ExplorerElement>
@@ -47,79 +47,79 @@ class GocryptfsVolume(var sessionID: Int) {
     }
 
     fun close() {
-        synchronized(this){
+        synchronized(applicationContext) {
             native_close(sessionID)
         }
     }
 
     fun isClosed(): Boolean {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_is_closed(sessionID)
         }
     }
 
     fun listDir(dir_path: String): MutableList<ExplorerElement> {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_list_dir(sessionID, dir_path)
         }
     }
 
     fun mkdir(dir_path: String): Boolean {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_mkdir(sessionID, dir_path, ConstValues.DIRECTORY_MODE)
         }
     }
 
     fun rmdir(dir_path: String): Boolean {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_rmdir(sessionID, dir_path)
         }
     }
 
     fun removeFile(file_path: String): Boolean {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_remove_file(sessionID, file_path)
         }
     }
 
     fun pathExists(file_path: String): Boolean {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_path_exists(sessionID, file_path)
         }
     }
 
     fun getSize(file_path: String): Long {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_get_size(sessionID, file_path)
         }
     }
 
     fun closeFile(handleID: Int) {
-        synchronized(this){
+        synchronized(applicationContext) {
             native_close_file(sessionID, handleID)
         }
     }
 
     fun openReadMode(file_path: String): Int {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_open_read_mode(sessionID, file_path)
         }
     }
 
     fun openWriteMode(file_path: String): Int {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_open_write_mode(sessionID, file_path, ConstValues.FILE_MODE)
         }
     }
 
     fun readFile(handleID: Int, offset: Long, buff: ByteArray): Int {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_read_file(sessionID, handleID, offset, buff)
         }
     }
 
     fun writeFile(handleID: Int, offset: Long, buff: ByteArray, buff_size: Int): Int {
-        synchronized(this){
+        synchronized(applicationContext) {
             return native_write_file(sessionID, handleID, offset, buff, buff_size)
         }
     }
@@ -237,4 +237,40 @@ class GocryptfsVolume(var sessionID: Int) {
             null
         }
     }
+
+    fun loadWholeFile(fullPath: String, maxSize: Long? = null): Pair<ByteArray?, Int> {
+        val fileSize = getSize(fullPath)
+        return if (fileSize >= 0) {
+            maxSize?.let {
+                if (fileSize > it) {
+                    return Pair(null, 0)
+                }
+            }
+            try {
+                val fileBuff = ByteArray(fileSize.toInt())
+                val handleID = openReadMode(fullPath)
+                if (handleID == -1) {
+                    Pair(null, 3)
+                } else {
+                    var offset: Long = 0
+                    val ioBuffer = ByteArray(DefaultBS)
+                    var length: Int
+                    while (readFile(handleID, offset, ioBuffer).also { length = it } > 0) {
+                        System.arraycopy(ioBuffer, 0, fileBuff, offset.toInt(), length)
+                        offset += length.toLong()
+                    }
+                    closeFile(handleID)
+                    if (offset == fileBuff.size.toLong()) {
+                        Pair(fileBuff, 0)
+                    } else {
+                        Pair(null, 4)
+                    }
+                }
+            } catch (e: OutOfMemoryError) {
+                Pair(null, 2)
+            }
+        } else {
+            Pair(null, 1)
+        }
+    }
 }

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

@@ -170,7 +170,7 @@ class OpenActivity : VolumeActionActivity() {
                                     if (success){
                                         startExplorer()
                                     } else {
-                                        GocryptfsVolume(sessionID).close()
+                                        GocryptfsVolume(applicationContext, sessionID).close()
                                     }
                                 }
                             }
@@ -257,7 +257,7 @@ class OpenActivity : VolumeActionActivity() {
         if (intent.action == "pick" && !isFinishingIntentionally){
             val sessionID = intent.getIntExtra("sessionID", -1)
             if (sessionID != -1){
-                GocryptfsVolume(sessionID).close()
+                GocryptfsVolume(applicationContext, sessionID).close()
                 RestrictedFileProvider.wipeAll(this)
             }
         }

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

@@ -1,14 +1,18 @@
 package sushi.hardcore.droidfs.adapters
 
-import android.content.Context
+import android.graphics.drawable.Drawable
-import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.LinearLayout
 import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.RecyclerView
-import sushi.hardcore.droidfs.ConstValues.Companion.getAssociatedDrawable
+import com.bumptech.glide.Glide
+import com.bumptech.glide.request.target.DrawableImageViewTarget
+import com.bumptech.glide.request.transition.Transition
+import sushi.hardcore.droidfs.ConstValues
+import sushi.hardcore.droidfs.GocryptfsVolume
 import sushi.hardcore.droidfs.R
 import sushi.hardcore.droidfs.explorers.ExplorerElement
 import sushi.hardcore.droidfs.util.PathUtils
@@ -16,17 +20,17 @@ import java.text.DateFormat
 import java.util.*
 
 class ExplorerElementAdapter(
-    context: Context,
+    val activity: AppCompatActivity,
-    private val onExplorerElementClick: (Int) -> Unit,
+    val gocryptfsVolume: GocryptfsVolume?,
-    private val onExplorerElementLongClick: (Int) -> Unit
+    val onExplorerElementClick: (Int) -> Unit,
+    val onExplorerElementLongClick: (Int) -> Unit
 ) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
-    private val dateFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.getDefault())
+    val dateFormat: DateFormat = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.getDefault())
     var explorerElements = listOf<ExplorerElement>()
         set(value) {
             field = value
             unSelectAll()
         }
-    private val inflater: LayoutInflater = LayoutInflater.from(context)
     val selectedItems: MutableList<Int> = ArrayList()
 
     override fun getItemCount(): Int {
@@ -72,11 +76,7 @@ class ExplorerElementAdapter(
         notifyDataSetChanged()
     }
 
-    open class ExplorerElementViewHolder(
+    open class ExplorerElementViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
-        itemView: View,
-        private val onClick: (Int) -> Boolean,
-        private val onLongClick: (Int) -> Boolean,
-    ) : RecyclerView.ViewHolder(itemView) {
         private val textElementName by lazy {
             itemView.findViewById<TextView>(R.id.text_element_name)
         }
@@ -99,57 +99,87 @@ class ExplorerElementAdapter(
 
         open fun bind(explorerElement: ExplorerElement, position: Int) {
             textElementName.text = explorerElement.name
-            selectableContainer.setOnClickListener {
+            (bindingAdapter as ExplorerElementAdapter?)?.let { adapter ->
-                setBackground(onClick(position))
+                selectableContainer.setOnClickListener {
-            }
+                    setBackground(adapter.onItemClick(position))
-            selectableContainer.setOnLongClickListener {
+                }
-                setBackground(onLongClick(position))
+                selectableContainer.setOnLongClickListener {
-                true
+                    setBackground(adapter.onItemLongClick(position))
+                    true
+                }
             }
         }
     }
 
-    open class RegularElementViewHolder(
+    open class RegularElementViewHolder(itemView: View) : ExplorerElementViewHolder(itemView) {
-        itemView: View,
-        private val dateFormat: DateFormat,
-        onClick: (Int) -> Boolean,
-        onLongClick: (Int) -> Boolean,
-    ) : ExplorerElementViewHolder(itemView, onClick, onLongClick) {
         open fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position)
             textElementSize.text = PathUtils.formatSize(explorerElement.size)
-            textElementMtime.text = dateFormat.format(explorerElement.mTime)
+            (bindingAdapter as ExplorerElementAdapter?)?.let {
+                textElementMtime.text = it.dateFormat.format(explorerElement.mTime)
+            }
             setBackground(isSelected)
         }
     }
 
-    class FileViewHolder(
+    class FileViewHolder(itemView: View) : RegularElementViewHolder(itemView) {
-        itemView: View,
+        var displayThumbnail = true
-        dateFormat: DateFormat,
+        var target: DrawableImageViewTarget? = null
-        onClick: (Int) -> Boolean,
+
-        onLongClick: (Int) -> Boolean,
+        private fun loadThumbnail(fullPath: String) {
-    ) : RegularElementViewHolder(itemView, dateFormat, onClick, onLongClick) {
+            (bindingAdapter as ExplorerElementAdapter?)?.let { adapter ->
+                adapter.gocryptfsVolume?.let { volume ->
+                    displayThumbnail = true
+                    Thread {
+                        volume.loadWholeFile(fullPath, 50_000_000).first?.let {
+                            if (displayThumbnail) {
+                                adapter.activity.runOnUiThread {
+                                    if (displayThumbnail) {
+                                        target = Glide.with(adapter.activity).load(it).into(object : DrawableImageViewTarget(icon) {
+                                            override fun onResourceReady(
+                                                resource: Drawable,
+                                                transition: Transition<in Drawable>?
+                                            ) {
+                                                super.onResourceReady(resource, transition)
+                                                target = null
+                                            }
+                                        })
+                                    }
+                                }
+                            }
+                        }
+                    }.start()
+                }
+            }
+        }
         override fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position, isSelected)
-            icon.setImageResource(getAssociatedDrawable(explorerElement.name))
+            icon.setImageResource(
+                when {
+                    ConstValues.isImage(explorerElement.name) -> {
+                        loadThumbnail(explorerElement.fullPath)
+                        R.drawable.icon_file_image
+                    }
+                    ConstValues.isVideo(explorerElement.name) -> {
+                        loadThumbnail(explorerElement.fullPath)
+                        R.drawable.icon_file_video
+                    }
+                    ConstValues.isText(explorerElement.name) -> R.drawable.icon_file_text
+                    ConstValues.isAudio(explorerElement.name) -> R.drawable.icon_file_audio
+                    else -> R.drawable.icon_file_unknown
+                }
+            )
         }
     }
-    class DirectoryViewHolder(
+
-        itemView: View,
+    class DirectoryViewHolder(itemView: View) : RegularElementViewHolder(itemView) {
-        dateFormat: DateFormat,
-        onClick: (Int) -> Boolean,
-        onLongClick: (Int) -> Boolean,
-    ) : RegularElementViewHolder(itemView, dateFormat, onClick, onLongClick) {
         override fun bind(explorerElement: ExplorerElement, position: Int, isSelected: Boolean) {
             super.bind(explorerElement, position, isSelected)
             icon.setImageResource(R.drawable.icon_folder)
         }
     }
-    class ParentFolderViewHolder(
+
-        itemView: View,
+    class ParentFolderViewHolder(itemView: View): ExplorerElementViewHolder(itemView) {
-        onClick: (Int) -> Boolean,
-        onLongClick: (Int) -> Boolean,
-    ): ExplorerElementViewHolder(itemView, onClick, onLongClick) {
         override fun bind(explorerElement: ExplorerElement, position: Int) {
             super.bind(explorerElement, position)
             textElementSize.text = ""
@@ -158,12 +188,22 @@ class ExplorerElementAdapter(
         }
     }
 
+    override fun onViewDetachedFromWindow(holder: RecyclerView.ViewHolder) {
+        if (holder is FileViewHolder) {
+            //cancel pending thumbnail display
+            holder.displayThumbnail = false
+            holder.target?.let {
+                Glide.with(activity).clear(it)
+            }
+        }
+    }
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
-        val view = inflater.inflate(R.layout.adapter_explorer_element, parent, false)
+        val view = activity.layoutInflater.inflate(R.layout.adapter_explorer_element, parent, false)
         return when (viewType) {
-            ExplorerElement.REGULAR_FILE_TYPE -> FileViewHolder(view, dateFormat, ::onItemClick, ::onItemLongClick)
+            ExplorerElement.REGULAR_FILE_TYPE -> FileViewHolder(view)
-            ExplorerElement.DIRECTORY_TYPE -> DirectoryViewHolder(view, dateFormat, ::onItemClick, ::onItemLongClick)
+            ExplorerElement.DIRECTORY_TYPE -> DirectoryViewHolder(view)
-            ExplorerElement.PARENT_FOLDER_TYPE -> ParentFolderViewHolder(view, ::onItemClick, ::onItemLongClick)
+            ExplorerElement.PARENT_FOLDER_TYPE -> ParentFolderViewHolder(view)
             else -> throw IllegalArgumentException()
         }
     }

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

@@ -1,6 +1,7 @@
 package sushi.hardcore.droidfs.adapters
 
 import android.content.Context
+import android.content.res.ColorStateList
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -8,9 +9,9 @@ import android.widget.BaseAdapter
 import android.widget.ImageView
 import android.widget.TextView
 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.PathUtils
 import sushi.hardcore.droidfs.util.WidgetUtil
 import sushi.hardcore.droidfs.widgets.CustomAlertDialogBuilder
 import sushi.hardcore.droidfs.widgets.NonScrollableColoredBorderListView
@@ -52,6 +53,7 @@ class SavedVolumesAdapter(private val context: Context, private val themeValue:
         val currentVolume = getItem(position)
         volumeNameTextView.text = currentVolume.name
         val deleteImageView = view.findViewById<ImageView>(R.id.delete_imageview)
+        deleteImageView.imageTintList = ColorStateList.valueOf(nonScrollableColoredBorderListView.colorAccent) //fix a strange bug that sometimes displays the icon in white
         deleteImageView.setOnClickListener {
             val dialog = CustomAlertDialogBuilder(context, themeValue)
             dialog.setTitle(R.string.warning)

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

@@ -78,7 +78,7 @@ open class BaseExplorerActivity : BaseActivity() {
         usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         volumeName = intent.getStringExtra("volume_name") ?: ""
         val sessionID = intent.getIntExtra("sessionID", -1)
-        gocryptfsVolume = GocryptfsVolume(sessionID)
+        gocryptfsVolume = GocryptfsVolume(applicationContext, sessionID)
         sortOrderEntries = resources.getStringArray(R.array.sort_orders_entries)
         sortOrderValues = resources.getStringArray(R.array.sort_orders_values)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
@@ -95,7 +95,16 @@ open class BaseExplorerActivity : BaseActivity() {
         setSupportActionBar(toolbar)
         title = ""
         titleText.text = getString(R.string.volume, volumeName)
-        explorerAdapter = ExplorerElementAdapter(this, ::onExplorerItemClick, ::onExplorerItemLongClick)
+        explorerAdapter = ExplorerElementAdapter(
+            this,
+            if (sharedPrefs.getBoolean("thumbnails", true)) {
+                gocryptfsVolume
+            } else {
+                null
+            },
+            ::onExplorerItemClick,
+            ::onExplorerItemLongClick
+        )
         explorerViewModel= ViewModelProvider(this).get(ExplorerViewModel::class.java)
         currentDirectoryPath = explorerViewModel.currentDirectoryPath
         setCurrentPath(currentDirectoryPath)

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

@@ -36,7 +36,7 @@ class ExplorerActivity : BaseExplorerActivity() {
         if (result.resultCode == Activity.RESULT_OK) {
             result.data?.let { resultIntent ->
                 val remoteSessionID = resultIntent.getIntExtra("sessionID", -1)
-                val remoteGocryptfsVolume = GocryptfsVolume(remoteSessionID)
+                val remoteGocryptfsVolume = GocryptfsVolume(applicationContext, remoteSessionID)
                 val path = resultIntent.getStringExtra("path")
                 val operationFiles = ArrayList<OperationFile>()
                 if (path == null){ //multiples elements

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

@@ -86,8 +86,7 @@ class ExplorerActivityPick : BaseExplorerActivity() {
         if (!isFinishingIntentionally && !usf_keep_open){
             val sessionID = intent.getIntExtra("originalSessionID", -1)
             if (sessionID != -1){
-                val v = GocryptfsVolume(sessionID)
+                GocryptfsVolume(applicationContext, sessionID).close()
-                v.close()
             }
             super.closeVolumeOnDestroy()
         }

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

@@ -30,7 +30,7 @@ abstract class FileViewerActivity: BaseActivity() {
         filePath = intent.getStringExtra("path")!!
         originalParentPath = PathUtils.getParentPath(filePath)
         val sessionID = intent.getIntExtra("sessionID", -1)
-        gocryptfsVolume = GocryptfsVolume(sessionID)
+        gocryptfsVolume = GocryptfsVolume(applicationContext, sessionID)
         usf_keep_open = sharedPrefs.getBoolean("usf_keep_open", false)
         foldersFirst = sharedPrefs.getBoolean("folders_first", true)
         windowInsetsController = WindowInsetsControllerCompat(window, window.decorView)
@@ -56,51 +56,20 @@ abstract class FileViewerActivity: BaseActivity() {
     }
 
     protected fun loadWholeFile(path: String): ByteArray? {
-        val fileSize = gocryptfsVolume.getSize(path)
+        val result = gocryptfsVolume.loadWholeFile(path)
-        if (fileSize >= 0){
+        if (result.second != 0) {
-            try {
+            val dialog = CustomAlertDialogBuilder(this, themeValue)
-                val fileBuff = ByteArray(fileSize.toInt())
-                var success = false
-                val handleID = gocryptfsVolume.openReadMode(path)
-                if (handleID != -1) {
-                    var offset: Long = 0
-                    val ioBuffer = ByteArray(GocryptfsVolume.DefaultBS)
-                    var length: Int
-                    while (gocryptfsVolume.readFile(handleID, offset, ioBuffer).also { length = it } > 0){
-                        System.arraycopy(ioBuffer, 0, fileBuff, offset.toInt(), length)
-                        offset += length.toLong()
-                    }
-                    gocryptfsVolume.closeFile(handleID)
-                    success = offset == fileBuff.size.toLong()
-                }
-                if (success){
-                    return fileBuff
-                } else {
-                    CustomAlertDialogBuilder(this, themeValue)
-                        .setTitle(R.string.error)
-                        .setMessage(R.string.read_file_failed)
-                        .setCancelable(false)
-                        .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
-                        .show()
-                }
-            } catch (e: OutOfMemoryError){
-                CustomAlertDialogBuilder(this, themeValue)
-                    .setTitle(R.string.error)
-                    .setMessage(R.string.outofmemoryerror_msg)
-                    .setCancelable(false)
-                    .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
-                    .show()
-            }
-
-        } else {
-            CustomAlertDialogBuilder(this, themeValue)
                 .setTitle(R.string.error)
-                .setMessage(R.string.get_size_failed)
                 .setCancelable(false)
                 .setPositiveButton(R.string.ok) { _, _ -> goBackToExplorer() }
-                .show()
+            when (result.second) {
+                1 -> dialog.setMessage(R.string.get_size_failed)
+                2 -> dialog.setMessage(R.string.outofmemoryerror_msg)
+                else -> dialog.setMessage(R.string.read_file_failed)
+            }
+            dialog.show()
         }
-        return null
+        return result.first
     }
 
     protected fun createPlaylist() {

app/src/main/java/sushi/hardcore/droidfs/widgets/NonScrollableColoredBorderListView.kt

@@ -1,6 +1,7 @@
 package sushi.hardcore.droidfs.widgets
 
 import android.content.Context
+import android.graphics.Color
 import android.graphics.drawable.ColorDrawable
 import android.util.AttributeSet
 import android.util.TypedValue
@@ -14,10 +15,16 @@ class NonScrollableColoredBorderListView: ListView {
     constructor(context: Context, attrs: AttributeSet): super(context, attrs) { applyColor() }
     constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int): super(context, attrs, defStyleAttr) { applyColor() }
 
-    fun applyColor() {
+    val colorAccent: Int
+
+    init {
         val typedValue = TypedValue()
         context.theme.resolveAttribute(R.attr.colorAccent, typedValue, true)
-        divider = ColorDrawable(typedValue.data)
+        colorAccent = typedValue.data
+    }
+
+    fun applyColor() {
+        divider = ColorDrawable(colorAccent)
         dividerHeight = context.resources.displayMetrics.density.toInt()*2
         background = ContextCompat.getDrawable(context, R.drawable.listview_border)
     }

app/src/main/res/drawable/icon_image.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="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
+</vector>

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

@@ -204,4 +204,6 @@
     <string name="encryption_cipher_label">Encryption cipher:</string>
     <string name="theme">Theme</string>
     <string name="theme_summary">Customize app theme</string>
+    <string name="thumbnails">Thumbnails</string>
+    <string name="thumbnails_summary">Show images and videos thumbnails</string>
 </resources>

app/src/main/res/xml/root_preferences.xml

@@ -38,6 +38,13 @@
             android:title="@string/folders_first"
             android:summary="@string/folders_first_summary"/>
 
+        <SwitchPreferenceCompat
+            android:defaultValue="true"
+            android:icon="@drawable/icon_image"
+            android:key="thumbnails"
+            android:title="@string/thumbnails"
+            android:summary="@string/thumbnails_summary"/>
+
         <SwitchPreferenceCompat
             android:defaultValue="true"
             app:icon="@drawable/icon_folder_search"