In order for an application screen to keep the screen from dimming or the processor from sleeping, the following permission must be defined in the Android Manifest file.

<uses-permission android:name=”android.permission.WAKE_LOCK” />

Specifically if you have a scenario where in Audio is being played using the MediaPlayer and you are invoking the MediaPlayer.setScreenOnWhilePlaying() or MediaPlayer.setWakeMode() methods, then you would have to request the permission in Android Manifest file else it would not work.