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

None of these solutions fixed it for me -- but this answer from Mark Murphy (https://code.google.com/p/android/issues/detail?id=77714) did:

Use getChildFragmentManager() to access a nested fragment, not getFragmentManager(). http://developer.android.com/reference/android/support/v4/app/Fragment.html#getChildFragmentManager%28%29

i.e.:

public class MapFragment extends Fragment {
    private GoogleMap map;
    private SupportMapFragment mapFragment;
    ...

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup vg, Bundle data) {
        View view = inflater.inflate(R.layout.map_view, vg, false);
        FragmentManager fm = getChildFragmentManager();
        mapFragment = (SupportMapFragment) fm.findFragmentById(R.id.map);
        mapFragment.getMapAsync(new OnMapReadyCallback() {
            public void onMapReady(GoogleMap googleMap) {
                map = googleMap;
                initMap();
            }
        });
    }
}