lets just move the deleted file into the recycle bin when appropriate

app/src/main/kotlin/com/simplemobiletools/gallery/activities/MainActivity.kt

@@ -275,7 +275,7 @@ class MainActivity : SimpleActivity(), DirectoryAdapter.DirOperationsListener {
             if (newFolder.exists() && newFolder.isDirectory) {
                 if (newFolder.list()?.isEmpty() == true) {
                     toast(String.format(getString(R.string.deleting_folder), config.tempFolderPath), Toast.LENGTH_LONG)
-                    tryDeleteFileDirItem(newFolder.toFileDirItem(applicationContext), true)
+                    tryDeleteFileDirItem(newFolder.toFileDirItem(applicationContext), true, true)
                 }
             }
             config.tempFolderPath = ""

app/src/main/kotlin/com/simplemobiletools/gallery/activities/MediaActivity.kt

@@ -490,7 +490,7 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
     private fun deleteDirectoryIfEmpty() {
         val fileDirItem = FileDirItem(mPath, mPath.getFilenameFromPath())
         if (config.deleteEmptyFolders && !fileDirItem.isDownloadsFolder() && fileDirItem.isDirectory && fileDirItem.getProperFileCount(applicationContext, true) == 0) {
-            tryDeleteFileDirItem(fileDirItem, true)
+            tryDeleteFileDirItem(fileDirItem, true, true)
         }
     }
 

app/src/main/kotlin/com/simplemobiletools/gallery/activities/PhotoVideoActivity.kt

@@ -95,7 +95,7 @@ open class PhotoVideoActivity : SimpleActivity(), ViewPagerFragment.FragmentList
             else -> TYPE_RAWS
         }
 
-        mMedium = Medium(null, getFilenameFromUri(mUri!!), mUri.toString(), mUri!!.path.getParentPath(), 0, 0, file.length(), type, false, 0)
+        mMedium = Medium(null, getFilenameFromUri(mUri!!), mUri.toString(), mUri!!.path.getParentPath(), 0, 0, file.length(), type, false, 0L)
         supportActionBar?.title = mMedium!!.name
         bundle.putSerializable(MEDIUM, mMedium)
 

app/src/main/kotlin/com/simplemobiletools/gallery/activities/ViewPagerActivity.kt

@@ -589,7 +589,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
                 }
 
                 if (getDoesFilePathExist(newPath)) {
-                    tryDeleteFileDirItem(FileDirItem(newPath, newPath.getFilenameFromPath()))
+                    tryDeleteFileDirItem(FileDirItem(newPath, newPath.getFilenameFromPath()), false, true)
                 }
 
                 copyFile(tmpPath, newPath)
@@ -618,7 +618,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
         } catch (e: Exception) {
             showErrorToast(e)
         } finally {
-            tryDeleteFileDirItem(tmpFileDirItem)
+            tryDeleteFileDirItem(tmpFileDirItem, false, true)
         }
     }
 
@@ -837,9 +837,23 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     }
 
     private fun deleteConfirmed() {
-        val path = getCurrentMedia()[mPos].path
+        val path = getCurrentMedia().getOrNull(mPos)?.path ?: return
-        tryDeleteFileDirItem(FileDirItem(path, path.getFilenameFromPath())) {
+        if (config.useRecycleBin) {
+            Thread {
+                movePathInRecycleBin(path) {
+                    if (it) {
+                        galleryDB.MediumDao().updateDeleted(path, System.currentTimeMillis())
                         refreshViewPager()
+                    } else {
+                        toast(R.string.unknown_error_occurred)
+                    }
+                }
+            }.start()
+        } else {
+            val fileDirItem = FileDirItem(path, path.getFilenameFromPath())
+            tryDeleteFileDirItem(fileDirItem, false, true) {
+                refreshViewPager()
+            }
         }
     }
 
@@ -926,7 +940,7 @@ class ViewPagerActivity : SimpleActivity(), ViewPager.OnPageChangeListener, View
     private fun deleteDirectoryIfEmpty() {
         val fileDirItem = FileDirItem(mDirectory, mDirectory.getFilenameFromPath(), getIsPathDirectory(mDirectory))
         if (config.deleteEmptyFolders && !fileDirItem.isDownloadsFolder() && fileDirItem.isDirectory && fileDirItem.getProperFileCount(applicationContext, true) == 0) {
-            tryDeleteFileDirItem(fileDirItem, true)
+            tryDeleteFileDirItem(fileDirItem, true, true)
         }
 
         scanPathRecursively(mDirectory)

app/src/main/kotlin/com/simplemobiletools/gallery/extensions/Activity.kt

@@ -133,7 +133,7 @@ fun BaseSimpleActivity.removeNoMedia(path: String, callback: (() -> Unit)? = nul
         return
     }
 
-    tryDeleteFileDirItem(file.toFileDirItem(applicationContext)) {
+    tryDeleteFileDirItem(file.toFileDirItem(applicationContext), false, false) {
         callback?.invoke()
     }
 }
@@ -168,12 +168,31 @@ fun BaseSimpleActivity.tryCopyMoveFilesTo(fileDirItems: ArrayList<FileDirItem>,
     }
 }
 
-fun BaseSimpleActivity.tryDeleteFileDirItem(fileDirItem: FileDirItem, allowDeleteFolder: Boolean = false, callback: ((wasSuccess: Boolean) -> Unit)? = null) {
+fun BaseSimpleActivity.tryDeleteFileDirItem(fileDirItem: FileDirItem, allowDeleteFolder: Boolean = false, deleteFromDatabase: Boolean,
+                                            callback: ((wasSuccess: Boolean) -> Unit)? = null) {
     deleteFile(fileDirItem, allowDeleteFolder) {
         callback?.invoke(it)
 
+        if (deleteFromDatabase) {
             Thread {
                 galleryDB.MediumDao().deleteMediumPath(fileDirItem.path)
             }.start()
         }
+    }
+}
+
+fun BaseSimpleActivity.movePathInRecycleBin(path: String, callback: (success: Boolean) -> Unit) {
+    val file = File(path)
+    val internalFile = File(filesDir, path)
+    return try {
+        file.copyRecursively(internalFile, true)
+        val fileDirItem = FileDirItem(path, path.getFilenameFromPath())
+        tryDeleteFileDirItem(fileDirItem, getIsPathDirectory(path), false) {
+            Thread {
+                callback(it)
+            }.start()
+        }
+    } catch (ignored: Exception) {
+        callback(false)
+    }
 }

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/MediaFetcher.kt

@@ -224,7 +224,7 @@ class MediaFetcher(val context: Context) {
 
             val path = file.absolutePath
             val isFavorite = favoritePaths.contains(path)
-            val medium = Medium(null, filename, path, file.parent, lastModified, dateTaken, size, type, isFavorite, 0)
+            val medium = Medium(null, filename, path, file.parent, lastModified, dateTaken, size, type, isFavorite, 0L)
             media.add(medium)
         }
         return media
@@ -281,7 +281,7 @@ class MediaFetcher(val context: Context) {
 
             val path = Uri.decode(file.uri.toString().replaceFirst("${context.config.OTGTreeUri}/document/${context.config.OTGPartition}%3A", OTG_PATH))
             val isFavorite = favoritePaths.contains(path)
-            val medium = Medium(null, filename, path, folder, dateModified, dateTaken, size, type, isFavorite, 0)
+            val medium = Medium(null, filename, path, folder, dateModified, dateTaken, size, type, isFavorite, 0L)
             media.add(medium)
         }
 

app/src/main/kotlin/com/simplemobiletools/gallery/interfaces/MediumDao.kt

@@ -34,4 +34,7 @@ interface MediumDao {
 
     @Query("UPDATE media SET is_favorite = :isFavorite WHERE full_path = :path COLLATE NOCASE")
     fun updateFavorite(path: String, isFavorite: Boolean)
+
+    @Query("UPDATE media SET deleted_ts = :deletedTS WHERE full_path = :path COLLATE NOCASE")
+    fun updateDeleted(path: String, deletedTS: Long)
 }

app/src/main/kotlin/com/simplemobiletools/gallery/models/Medium.kt

@@ -26,7 +26,7 @@ data class Medium(
         @ColumnInfo(name = "size") val size: Long,
         @ColumnInfo(name = "type") val type: Int,
         @ColumnInfo(name = "is_favorite") var isFavorite: Boolean,
-        @ColumnInfo(name = "deleted_ts") var deletedTS: Int) : Serializable, ThumbnailItem() {
+        @ColumnInfo(name = "deleted_ts") var deletedTS: Long) : Serializable, ThumbnailItem() {
 
     companion object {
         private const val serialVersionUID = -6553149366975655L

app/src/main/kotlin/com/simplemobiletools/gallery/receivers/RefreshMediaReceiver.kt

@@ -19,7 +19,7 @@ class RefreshMediaReceiver : BroadcastReceiver() {
 
         Thread {
             val medium = Medium(null, path.getFilenameFromPath(), path, path.getParentPath(), System.currentTimeMillis(), System.currentTimeMillis(),
-                    File(path).length(), getFileType(path), false, 0)
+                    File(path).length(), getFileType(path), false, 0L)
             context.galleryDB.MediumDao().insert(medium)
         }.start()
     }