RemoteControlClient图像亮度？

Question

我的目的是允许用户在锁定屏幕上显示图片。我能找到的唯一方法是通过RemoteControlClient。我的问题是锁定屏幕上的图像相当暗淡，我想知道是否有设置使其更亮。我设置的代码如下：

 private void setUpRemoteController() {
    AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    audioManager.requestAudioFocus(new AudioFocusListener(), AudioManager.STREAM_MUSIC,
        AudioManager.AUDIOFOCUS_GAIN);
    ComponentName pareceiver = new ComponentName(this, PAReceiver.class.getName());
    audioManager.registerMediaButtonEventReceiver(pareceiver);
    Intent mediaButtonIntent = new Intent(android.content.Intent.ACTION_MEDIA_BUTTON);
    mediaButtonIntent.setComponent(pareceiver);
    PendingIntent mediaPendingIntent = PendingIntent.getBroadcast(this,
            0,mediaButtonIntent,0);
    remoteControlClient = new RemoteControlClient(mediaPendingIntent);
    remoteControlClient.setPlaybackState(
            RemoteControlClient.PLAYSTATE_PLAYING);
    remoteControlClient.setTransportControlFlags(
           RemoteControlClient.FLAG_KEY_MEDIA_NEXT |
            RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS);
    audioManager.registerRemoteControlClient(remoteControlClient);
    Log.d("", "Started and set up controller and receiver");
}

相关说明：如果我实际上不需要劫持音频焦点，有没有办法让RemoteControlClient显示出来？