MediaCodec API offers functionality that allows you to decode and encode video and audio efficiently, possibly also with hardware acceleration.
Used together with
OpengGL ES, you get access to powerful APIs for manipulating and editing video files.
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Displaying an overlay window is another way that can be used to customize the look of an Android device. An app that uses an overlay window can display content on top of all other apps.
One example of usage are Facebook Messenger chat heads. Another example are the various apps that adjust brigh...