Android Google Maps : Map View initialization

Issue

I am trying to display a simple map in my Android application, using the MapView class. I use the following onCreate method in my activity :

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    try {
        MapsInitializer.initialize(this);
    } catch (GooglePlayServicesNotAvailableException e) {
        Log.e("Address Map", "Could not initialize google play", e);
    }

    MapView mapView = new MapView(this);
    CameraUpdate camPos = CameraUpdateFactory.newLatLng(new LatLng(11.562276,104.920292));
    mapView.getMap().moveCamera(camPos);
    setContentView(mapView);
}

I have a NullPointerException, because the method mapView.getMap() returns null. Don't understand why, Google play services are apparently present and initialized.

Solution

Could not get MapView to work, I finally ended using the class SupportMapFragment.

For those that it may help, here is the complete code of my activity :

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

    private final static int FRAGMENT_ID = 0x101;
    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        layout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

        SupportMapFragment fragment = SupportMapFragment.newInstance();
        layout.setId(0x101);
        {
            FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
            fragmentTransaction.add(FRAGMENT_ID, fragment);
            fragmentTransaction.commit();
        }

        setContentView(layout);

    }

    @Override
    protected void onResume() {
        super.onResume();
        setUpMapIfNeeded();
    }


    private void setUpMapIfNeeded() {
        if (mMap == null) {
            mMap = ((SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(FRAGMENT_ID)).getMap();
            if (mMap != null) {
                mMap.moveCamera(
                    CameraUpdateFactory.newLatLngZoom(new LatLng(11.562276, 104.920292), 10));
            }
        }
    }
}

Answered By - Arnaud