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Question

I have a really complicated app that has various different functions. One of these functions include a google maps tab. The app is structured in such a way that each tab is a fragment. In this particular case I am having trouble declaring my google map object to grab my current location data.

Here is the relevant code

public static class GpsClass extends Fragment{
    View rootView;
    private GoogleMap mMap;

    public static final String ARG_SECTION_NUMBER = "section_number";
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        if (rootView != null){
                ((ViewGroup) rootView.getParent()).removeView(rootView);
            }
            try{
                rootView = inflater.inflate(R.layout.gps, container,false);
                mMap = ((SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.mymap)).getMap();
                mMap.setMyLocationEnabled(true);

            } catch(InflateException e){

            }
            return rootView;
        }
    }

In this codes implementation I get a Null Pointer exception when I try to declare mMap. If I remove the getAvtivity() call the eclipse tells me I can't make a static reference to a non-static method. If I remove the mMap lines my app works with a google map in one tab (the other tabs implement other things which all work).

Answer 1

Can you include your layout xml?

If your map fragment is SupportMapFragment ( com.google.android.gms.maps.SupportMapFragment ), use:

mMap = ((SupportMapFragment) getFragmentManager ().findFragmentById (R.id.map)).getMap ();

or

if your map fragment is MapFragment ( com.google.android.gms.maps.MapFragment ), use:

mMap = ((MapFragment) getFragmentManager ().findFragmentById (R.id.map)).getMap ();

EDIT: The actual answer to the OP's question: Make sure you're using the right class name for the Map Fragment when declaring it in your layout XML.

Answer 2

Try this

GoogleMap mMap = ((SupportMapFragment) getFragmentManager()
                .findFragmentById(R.id.map)).getMap();

and in your xml

<fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment" />