Android : Android Maps V2 tiles not updating

The tiles of the map are not being updated, the only way to update them is to block the device (onPause called) and to unblock the device (onResume called). If i do that, the tiles become updated.... it is very strange

this is my code:

public class MainActivity extends Activity {
    MapView map;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout main = new LinearLayout(this);
        main.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));

        GoogleMapOptions options = new GoogleMapOptions();
        options.mapType(GoogleMap.MAP_TYPE_SATELLITE)
        .compassEnabled(false)
        .rotateGesturesEnabled(false)
        .tiltGesturesEnabled(false);

        options.camera(new CameraPosition(new LatLng(0, 0), 1, 0, 0));  

        map = new MapView(this, options);
        map.onCreate(savedInstanceState);
        main.addView(map);

        setContentView(main);
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        map.onResume();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        map.onPause();
    }


}