title: setVolumeControlStream doesn't work
body: <p>I'm trying to change the volume control in my app. So I found out that I have to use the <code>"setVolumeControlStream"</code> function in the onCreate method. Now I have a fragment and its not changing anything. Some ideas to get this method work?</p>
  
  <p>What I tried: <code>getActivity().setVolumeControlStream(AudioManager.STREAM_MUSIC);</code></p>