title: AudioManager and system volume change receiver
body: <p>I've followed instructions on <a href="http://android-developers.blogspot.com/2010/06/allowing-applications-to-play-nicer.html" rel="nofollow">this page</a> until "Preparing your code for Android 2.2 without restricting it to Android 2.2". Even if I'm building against 2.3 version, I guess it should be working at this point but it's not. I've registered a receiver in manifest:</p>
  
  <pre><code>&lt;receiver android:name="RemoteControlReceiver"&gt;
      &lt;intent-filter&gt;
          &lt;action android:name="android.intent.action.MEDIA_BUTTON" /&gt;
      &lt;/intent-filter&gt;
  &lt;/receiver&gt;
  </code></pre>
  
  <p>created a class for RemoteControlReceiver declaration:</p>
  
  <pre><code>public class RemoteControlReceiver extends BroadcastReceiver {
      @Override
      public void onReceive(Context context, Intent intent) {
          Toast.makeText(context, "onReceive", Toast.LENGTH_SHORT).show();
      }
  }
  </code></pre>
  
  <p>and finally boostrapped it in the starting activity.</p>
  
  <pre><code>private AudioManager _audioManager;
  private ComponentName _componentName;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  
      _audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
      _componentName = new ComponentName(getPackageName(), RemoteControlReceiver.class.getName());
  }
  
  @Override
  protected void onResume() {
      super.onResume();
  
      _audioManager.registerMediaButtonEventReceiver(_componentName);
  
      _audioManager.requestAudioFocus(new OnAudioFocusChangeListener() {
  
              @Override
              public void onAudioFocusChange(int focusChange) {
                      Toast.makeText(getApplicationContext(), "onFocusChanged", Toast.LENGTH_SHORT).show();
              }
      }, AudioManager.STREAM_MUSIC, 0);
  }
  </code></pre>
  
  <p>Could you point out what am I missing here ? I have an assumption that in order to receive thodse messages I my activity has to play any media stuff. I gonna test it right away.</p>
  
  <p>P.S. As you see I've even added some uneccessary code - don't pay attention to requestAudioFocus.</p>
  
  <p>Thanks for any suggestions.</p>