add some animations at item deleting

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

@@ -199,7 +199,6 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
     }
 
     override fun deleteFiles(files: ArrayList<File>) {
-        var deletedCnt = 0
         files.filter { it.exists() && it.isImageVideoGif() }
                 .forEach {
                     if (needsStupidWritePermissions(it.absolutePath)) {
@@ -216,27 +215,12 @@ class MediaActivity : SimpleActivity(), MediaAdapter.MediaOperationsListener {
                         it.delete()
                     }
 
-                    if (deleteFromMediaStore(it))
-                        deletedCnt++
+                    deleteFromMediaStore(it)
                 }
 
-        if (deletedCnt == files.size) {
-            updateMediaView()
-        } else {
-            scanFiles(files) {
-                updateMediaView()
-            }
-        }
-    }
-
-    private fun updateMediaView() {
         if (mMedia.isEmpty()) {
             finish()
         }
-
-        if (!isDirEmpty()) {
-            getMedia()
-        }
     }
 
     private fun isSetWallpaperIntent() = intent.getBooleanExtra(SET_WALLPAPER_INTENT, false)

app/src/main/kotlin/com/simplemobiletools/gallery/adapters/MediaAdapter.kt

@@ -191,7 +191,17 @@ class MediaAdapter(val activity: SimpleActivity, var media: MutableList<Medium>,
     private fun deleteFiles() {
         val selections = multiSelector.selectedPositions
         val files = ArrayList<File>(selections.size)
-        selections.forEach { files.add(File(media[it].path)) }
+        val removeMedia = ArrayList<Medium>(selections.size)
+
+        selections.reverse()
+        selections.forEach {
+            val medium = media[it]
+            files.add(File(medium.path))
+            removeMedia.add(medium)
+            notifyItemRemoved(it)
+        }
+
+        media.removeAll(removeMedia)
         listener?.deleteFiles(files)
     }