Google Play Service - SupportMapFragment.getMap() always returning null [duplicate]

Question

Possible Duplicate:
How do I know the map is ready to get used when using the SupportMapFragment?

I am currently testing the new Maps API V2 but I'm really having trouble getting it to work correclty.

My problem is that getMap() always returns null.

I have tested the call in 3 different points:

1. onCreate()
2. onResume()
3. in a Handler that is called some seconds after the map is already visible on the screen

Here is the code:

public class MapActivity extends FragmentActivity {

private SupportMapFragment mMapFragment;

@Override
protected void onCreate(Bundle arg0) {
    super.onCreate(arg0);
            setupMap();
}

@Override
protected void onResume() {
    super.onResume();
    setupMap();
    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {
            setupMap();
        }
    }, 5000);
}

private void setupMap() {
    if (getSupportFragmentManager().findFragmentById(R.id.fragment) == null) {
    mMapFragment = CustomMapFragment.newInstance();
        getSupportFragmentManager().beginTransaction()
                .add(R.id.map_wrapper, mMapFragment).commit();
    }
    GoogleMap map = mMapFragment.getMap();
    if (map != null) {
        mMapFragment.getMap().getUiSettings().setZoomControlsEnabled(true);
        mMapFragment.getMap().getUiSettings().setZoomGesturesEnabled(true);
        mMapFragment.getMap().setMyLocationEnabled(true);
    }
}

Anything that I'm doing wrong?

Burbot

it indeed is, a shame that I didn't find that questions via the search function :( I will post my sample workaround as an answer. Thanks CommonsWare! – Burbot

Firstly, what type of device were you running this code on? Physical device, or emulator (which may not have had Play Services installed). – Extravasation

Answer 1

As CommonsWare stated in the linked question, the problem only occures when creating the SupportMapFragment programmatically and not a <fragment> XML tag.

If created programmatically, the map will be available in the onActivityCreated() call. So my workaround is the following:

mMapFragment = new SupportMapFragment() {
            @Override
            public void onActivityCreated(Bundle savedInstanceState) {
                super.onActivityCreated(savedInstanceState);
                GoogleMap map = mMapFragment.getMap();
                if (map != null) {
                    //Your initialization code goes here
                }
            }
        };

Burbot

One should not create non-static inner fragment because compiler will automatically create constructor to provide outer class to the fragment as an argument. Then on fragment recreation you will get InstantiationException because there is no default empty constructor for the fragment. – Huddleston

How can you do this but also give options? Usually we instantiate with SupportMapFragment.newInstance(options); – Felipe

you don't need options since you'll get variables as closure (if final), unfortunately the code is not usable see Alexander comment – Debora

@AlexanderMironov I reckon that but i have made the mMapFragment static but still gets InstantiationException. Any help? – Marshland