title: Use this.setVolumeControlStream(AudioManager.STREAM_MUSIC); to control android phone rocker when activity is out of focus (with service)?
body: <p>I am working on a android music player app that also plays music in the background. I used this.setVolumeControlStream(AudioManager.STREAM_MUSIC); to change the media volume when the activity is in focus. But is there a way to control the media volume with rocker when my player is out of focus? (maybe by creating a service?) </p>
  
  <p>Thanks!</p>