title: openstreetmap - How to set marker in center of screen?
body: <p>I'm trying to display marker using <code>osmbonuspack_v4.8 ilb</code>. 
  The marker was displayed but it place in <code>left-top</code> of screen.
  I'm trying to <em>set</em> in center but can't. I don't konw the reason.</p>
  
  <p>Please tell me the best way.  </p>
  
  <pre><code>protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          mapView = (MapView) findViewById(R.id.mapview);
          mapView.setBuiltInZoomControls(true);
          mapView.setMultiTouchControls(true);
  
          mapView.setTileSource(TileSourceFactory.MAPNIK);
          mapController = (MapController) this.mapView.getController();
          mapController.setZoom(15);
          GeoPoint center = new GeoPoint(52.221, 6.893);
          mapController.animateTo(center);
          //mapController.setCenter(center);
  
          //--- Create Overlay
          addMarker(center);
  
          locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
          locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
  }
  </code></pre>