add some helper menu buttons for emptying and disabling recycle bin

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

@@ -198,6 +198,9 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
             findItem(R.id.unhide_folder).isVisible = isFolderHidden && !mShowAll && mPath != FAVORITES && mPath != RECYCLE_BIN
             findItem(R.id.exclude_folder).isVisible = !mShowAll && mPath != FAVORITES && mPath != RECYCLE_BIN
 
+            findItem(R.id.empty_recycle_bin).isVisible = mPath == RECYCLE_BIN
+            findItem(R.id.empty_disable_recycle_bin).isVisible = mPath == RECYCLE_BIN
+
             findItem(R.id.folder_view).isVisible = mShowAll
             findItem(R.id.open_camera).isVisible = mShowAll
             findItem(R.id.about).isVisible = mShowAll
@@ -219,6 +222,8 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         when (item.itemId) {
             R.id.sort -> showSortingDialog()
             R.id.filter -> showFilterMediaDialog()
+            R.id.empty_recycle_bin -> emptyRecycleBin()
+            R.id.empty_disable_recycle_bin -> emptyAndDisableRecycleBin()
             R.id.toggle_filename -> toggleFilenameVisibility()
             R.id.open_camera -> launchCamera()
             R.id.folder_view -> switchToFolderView()
@@ -418,6 +423,18 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
         }
     }
 
+    private fun emptyRecycleBin() {
+        emptyTheRecycleBin {
+            finish()
+        }
+    }
+
+    private fun emptyAndDisableRecycleBin() {
+        emptyAndDisableTheRecycleBin {
+            finish()
+        }
+    }
+
     private fun toggleFilenameVisibility() {
         config.displayFileNames = !config.displayFileNames
         getMediaAdapter()?.updateDisplayFilenames(config.displayFileNames)

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

@@ -204,3 +204,21 @@ fun BaseSimpleActivity.movePathsInRecycleBin(paths: ArrayList<String>, callback:
         callback?.invoke(pathsCnt == 0)
     }.start()
 }
+
+fun BaseSimpleActivity.emptyTheRecycleBin(callback: () -> Unit) {
+    Thread {
+        filesDir.deleteRecursively()
+        galleryDB.MediumDao().clearRecycleBin()
+        galleryDB.DirectoryDao().deleteRecycleBin()
+        callback()
+    }.start()
+}
+
+fun BaseSimpleActivity.emptyAndDisableTheRecycleBin(callback: () -> Unit) {
+    Thread {
+        emptyTheRecycleBin {
+            config.useRecycleBin = false
+            callback()
+        }
+    }.start()
+}

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

@@ -4,6 +4,7 @@ import android.arch.persistence.room.Dao
 import android.arch.persistence.room.Insert
 import android.arch.persistence.room.OnConflictStrategy.REPLACE
 import android.arch.persistence.room.Query
+import com.simplemobiletools.gallery.helpers.RECYCLE_BIN
 import com.simplemobiletools.gallery.models.Directory
 
 @Dao
@@ -25,4 +26,7 @@ interface DirectoryDao {
 
     @Query("UPDATE directories SET thumbnail = :thumbnail, filename = :name, path = :newPath WHERE path = :oldPath COLLATE NOCASE")
     fun updateDirectoryAfterRename(thumbnail: String, name: String, newPath: String, oldPath: String)
+
+    @Query("DELETE FROM directories WHERE path = \'$RECYCLE_BIN\' COLLATE NOCASE")
+    fun deleteRecycleBin()
 }

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

@@ -37,4 +37,7 @@ interface MediumDao {
 
     @Query("UPDATE media SET deleted_ts = :deletedTS WHERE full_path = :path COLLATE NOCASE")
     fun updateDeleted(path: String, deletedTS: Long)
+
+    @Query("DELETE FROM media WHERE deleted_ts != 0")
+    fun clearRecycleBin()
 }

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

@@ -22,6 +22,14 @@
         android:icon="@drawable/ic_filter"
         android:title="@string/filter_media"
         app:showAsAction="ifRoom"/>
+    <item
+        android:id="@+id/empty_recycle_bin"
+        android:title="@string/empty_recycle_bin"
+        app:showAsAction="never"/>
+    <item
+        android:id="@+id/empty_disable_recycle_bin"
+        android:title="@string/empty_and_disable_recycle_bin"
+        app:showAsAction="never"/>
     <item
         android:id="@+id/folder_view"
         android:title="@string/folder_view"