Hi, I am new to this whole app programming thing. I am trying to write a music player that can play music in the background. Therefore, I also need to write a service. I already finished the music playing part but I dont know how to use the volume rocker to change the media volume when the app is running in the background. I used: this.setVolumeControlStream(AudioManager.STREAM_MUSIC); to accomplish it in the app activity. Any help would be appreciated!