audio - Change Media volume in Android? - Stack Overflow

audio - Change Media volume in Android? - Stack Overflow:

private AudioManager audio;

Inside onCreate:

audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

Override onKeyDown:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
     switch (keyCode) {
          case KeyEvent.KEYCODE_VOLUME_UP:
                audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                                   AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
                return true;
          case KeyEvent.KEYCODE_VOLUME_DOWN:
                audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,
                                   AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
                return true;
          default:
                return super.onKeyDown(keyCode, event);
      }
}