更新说明:
Added support for double tap gesture; Toggle play/pause.
Added support for Samsung multiwindow.
Added an option to hide position text while seeking video. Check Playback screen > Menu > Display > Settings > Navigation > Display position text while seeking video
Changed Kids Lock behavior; If kids lock is in use, do not exit playback screen even if last video is finished.
Fixed h/w+ playback failure on Google Nexus 10.
Fixed dialogs not to hide behind main window in Android 4.2