focus Gain
Specifies how audio focus will be requested. Defaults to AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK Valid values for focus requests are AudioManager.AUDIOFOCUS_GAIN, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK and AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE.