static void androidMuteAudio() {
  androidMuteAudio(androidActivity());
}

static void androidMuteAudio(Activity androidContext) {
  AudioManager amanager = (AudioManager) androidContext.getSystemService(Context.AUDIO_SERVICE);
  amanager.setStreamMute(AudioManager.STREAM_NOTIFICATION, true);
  amanager.setStreamMute(AudioManager.STREAM_ALARM, true);
  amanager.setStreamMute(AudioManager.STREAM_MUSIC, true);
  amanager.setStreamMute(AudioManager.STREAM_RING, true);
  amanager.setStreamMute(AudioManager.STREAM_SYSTEM, true);
}