Android GoogleMap or SupportMapFragment - null pointer exception

Question

In my app i showing google map version2 in a fragment. but i get Null pointer exception at

mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id

Answer 1

After hours of search, I did in this way:

 public class MapFragment extends Fragment {
    private GoogleMap map;
    SupportMapFragment mapFrag;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        setHasOptionsMenu(true);
        View rootView = inflater.inflate(R.layout.fragment_map, container,
                false);

        fm = getActivity().getSupportFragmentManager();
        map = ((SupportMapFragment) fm.findFragmentById(R.id.map)).getMap();

        return rootView;

    }
}