A free program for Android, by Player : HD Video Player.

This application will allow you to watch all the videos you want in high quality. It supports all the video formats you can think of, such as MKV, MP4, M4V, AVI, MOV, 3GP, FLV, WMV, RMVB, MPG, etc.

It has a powerful equalizer, bass booster, and stereo surround sound effect that makes you feel like being in the cinema.

It has a beautiful UI and easy gestures to control the volume, playing progress, and brightness.

It plays your favorite videos on a floating screen.

It has a powerful and easy-to-use interface, and you will be able to control the volume, playing progress, and brightness by swiping on the play screen.