title: Add a CompassOverlay and get errors
body: <p>I want to add a compassoverlay, but I get some errors:</p>
  
  <pre><code>this.mCompassOverlay = new CompassOverlay(context, new InternalCompassOrientationProvider(context), mMapView);
  mMapView.getOverlays().add(this.mCompassOverlay);
  </code></pre>
  
  <p>Can not resolve Symbol 'mCompassOverlay'
  and
  Can not resolve Symbol 'context'</p>
  
  <p>Where I get the "Symbols"?</p>