adding buttons to the videoplayer for going to next/prev file

app/src/main/kotlin/com/simplemobiletools/gallery/pro/activities/VideoPlayerActivity.kt

@@ -161,6 +161,8 @@ open class VideoPlayerActivity : SimpleActivity(), SeekBar.OnSeekBarChangeListen
         video_curr_time.setOnClickListener { skip(false) }
         video_duration.setOnClickListener { skip(true) }
         video_toggle_play_pause.setOnClickListener { togglePlayPause() }
+        video_next_file.setOnClickListener { }
+        video_prev_file.setOnClickListener { }
 
         video_player_holder.setOnTouchListener { view, event ->
             handleEvent(event)
@@ -419,7 +421,7 @@ open class VideoPlayerActivity : SimpleActivity(), SeekBar.OnSeekBarChangeListen
         }
 
         val newAlpha = if (isFullScreen) 0f else 1f
-        arrayOf(video_toggle_play_pause, video_curr_time, video_seekbar, video_duration, top_shadow, video_bottom_gradient).forEach {
+        arrayOf(video_prev_file, video_toggle_play_pause, video_next_file, video_curr_time, video_seekbar, video_duration, top_shadow, video_bottom_gradient).forEach {
             it.animate().alpha(newAlpha).start()
         }
         video_seekbar.setOnSeekBarChangeListener(if (mIsFullscreen) null else this)

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

@@ -7,6 +7,17 @@
     android:layout_height="wrap_content"
     android:layout_alignParentBottom="true">
 
+    <ImageView
+        android:id="@+id/video_prev_file"
+        android:layout_width="@dimen/video_player_play_pause_size"
+        android:layout_height="@dimen/video_player_play_pause_size"
+        android:layout_alignParentStart="true"
+        android:layout_marginStart="@dimen/small_margin"
+        android:layout_marginTop="@dimen/activity_margin"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:padding="@dimen/normal_margin"
+        android:src="@drawable/ic_prev_outline"/>
+
     <ImageView
         android:id="@+id/video_toggle_play_pause"
         android:layout_width="@dimen/video_player_play_pause_size"
@@ -18,6 +29,17 @@
         android:src="@drawable/ic_pause_outline"
         android:visibility="invisible"/>
 
+    <ImageView
+        android:id="@+id/video_next_file"
+        android:layout_width="@dimen/video_player_play_pause_size"
+        android:layout_height="@dimen/video_player_play_pause_size"
+        android:layout_alignParentEnd="true"
+        android:layout_marginTop="@dimen/activity_margin"
+        android:layout_marginEnd="@dimen/small_margin"
+        android:background="?attr/selectableItemBackgroundBorderless"
+        android:padding="@dimen/normal_margin"
+        android:src="@drawable/ic_next_outline"/>
+
     <TextView
         android:id="@+id/video_curr_time"
         android:layout_width="wrap_content"