Google Maps Fragment returning null inside a fragment

Question

So I have an empty fragment that contains a map fragment. Whenever I try to activate the fragment containing the map, my app crashes and returns a null pointer error on this

Answer 1

Your class extends from Fragment, and you are using a Fragment declared in the layout, but nested fragment only work when they are added dynamically.

So, you have two options:

1) Extending from FragmentAcivity instead of Fragment and applying the proper methods.

2) Add the Fragment dynamically, as follow:

//ReturnVisitDetails

MapFragment mapFragment = new MapFragment();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.rl_map_container, mapFragment).commit();

//Layout

--UPDATED--

A complete example to use Google Maps inside a Fragment:

//TestFragmentActivity

public class TestFragmentActivity extends android.support.v4.app.FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_fragment_activity);
    }

}

//TestFragment

public class TestFragment extends android.support.v4.app.Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.test_fragment, container, false);

        CustomMapFragment mapFragment = new CustomMapFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.map_container, mapFragment).commit();
        return rootView;
    }

}

//CustomMapFragment

public class CustomMapFragment extends com.google.android.gms.maps.SupportMapFragment {

    private final LatLng HAMBURG = new LatLng(53.558, 9.927);

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        GoogleMap googleMap = getMap();
        googleMap.addMarker(new MarkerOptions().position(HAMBURG).title("Hamburg"));
        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
    }

}

//test_fragment_activity.xml

//test_fragment.xml