gistfile1.java

public class MapActivity {
    
    private GoogleMap mMap;
    private MapFragment mFragment;
    
    public void onCreate(...) {
        mFragment = MapFragment.newInstance(parameters);
        
        // set other stuff up
    }
    
    public void somewhereLaterInCode() {
        mMap = setupGoogleMapSomehow();
        mFragment.setGoogleMap(mMap);
    }
}