Android GoogleMap or SupportMapFragment - null pointer exception

Question 1

try to change this:

FragmentManager myFM = getActivity().getSupportFragmentManager();

final SupportMapFragment myMAPF = (SupportMapFragment) myFM
                .findFragmentById(R.id.map);

Question 2

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();
            }
        });
    }
}

Question 3

Try changing to

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

You're using getFragmentManager(), but casting it to SupportMapFragment

You also need to extend FragmentActivity: http://developer.android.com/reference/android/support/v4/app/FragmentActivity.html

Question 4

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

if(map != null) {
         mMap.addMarker(new MarkerOptions() .position(new LatLng(xxxxxx,xxxxxx)) .title("Current Location")
         .icon(BitmapDescriptorFactory.fromResource(R.drawable.ball_pointer))
         .snippet("xxxxx"));
}

<meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="xxxxxxxxxxxxxxxxxxxxxxxx" />

place your google api key here. You get from google Read the documentation.

Question 5

After hours of search, I did in this way:

 public class MapFragment extends Fragment {
    private GoogleMap map;
    SupportMapFragment mapFrag;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        setHasOptionsMenu(true);
        View rootView = inflater.inflate(R.layout.fragment_map, container,
                false);

        fm = getActivity().getSupportFragmentManager();
        map = ((SupportMapFragment) fm.findFragmentById(R.id.map)).getMap();

        return rootView;

    }
}

Question 6

Try to add tools:context=".YourActivity" to the fragment xml:

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".YourActivity" />

Question 7

May be above answers work but what work for me is this.

 {
    SupportPlaceAutocompleteFragment supportPlaceAutocompleteFragmentSearch;
    FragmentManager fragmentManagerSearch = getChildFragmentManager();
    supportPlaceAutocompleteFragmentSearch = 
                                            (SupportPlaceAutocompleteFragment)
                                            fragmentManagerSearch.findFragmentById(R.id.place_autocomplete_fragment_search);
    }

Question 8

if you developed your code with Kotlin, and want to add MapFragment to another Fragment you need to use SupportMapFragment but if you do it, you will get null exception so you should use childFragmentManager rather than supportFragmentManager and the code should be in onCreateView not in onCreate just add below code:

private lateinit var mapFragment : SupportMapFragment

 mapFragment = childFragmentManager.findFragmentById(R.id.mapview) as SupportMapFragment
    mapFragment.getMapAsync { googleMap ->
        this.googleMap = googleMap
        setGoogleMapSettings()
    }