Google map called inside a fragment returns null

Question

I am trying to put Map inside a fragment. I am pasting the codes I am using

XML

           <fragment
            android:id="@+id/contactFrag_F_map"
            android:name="com.google.android.gms.maps.MapFragment"
            android:layout_width="match_parent"
            android:layout_height="200dp"/>

Below is my Fragment name declared

public class ContactFragment extends MapFragment 

Below is how I initialised map

private void initilizeMap() {
    if (googleMap == null) {

        if (googleMap == null) {
            googleMap = ((MapFragment) getActivity().getFragmentManager().findFragmentById(
                    R.id.contactFrag_F_map)).getMap();
        }
        // check if map is created successfully or not
        if (googleMap == null) {
            Toast.makeText(getActivity(),
                    "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}

And this method was called on onCreateView

The error is

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.MapFragment.getMap()' on a null object reference

Please help to solve this issue. The issue is in below portion

if (googleMap == null) {
                googleMap = ((MapFragment) getActivity().getFragmentManager().findFragmentById(
                        R.id.contactFrag_F_map)).getMap();
            }

EDIT 1

Changed the xml to

<fragment
                android:id="@+id/contactFrag_F_map" 
                android:name="com.google.android.gms.maps.SupportMapFragment"
                android:layout_width="match_parent"
                android:layout_height="200dp"/>

and

public class ContactFragment extends SupportMapFragment

And the initialisation

if (googleMap == null) {
                googleMap = ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(
                        R.id.contactFrag_F_map)).getMap();
            }

But again the error is

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.SupportMapFragment.getMap()' on a null object reference

and it happens in the line

if (googleMap == null) {
                    googleMap = ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(
                            R.id.contactFrag_F_map)).getMap();
                }

Why would this happen??

EDIT 2

Yes.. the getmap is deprecated . So i tried

MapFragment mapFragment = (MapFragment) getChildFragmentManager().findFragmentById(R.id.contactFrag_F_map);
        mapFragment.getMapAsync(this);

and ..

public class ContactFragment extends MapFragment implements OnMapReadyCallback { 

and the callback ..

@Override
    public void onMapReady(GoogleMap googleMap) {

        theGoogleMap = googleMap;

        setUpMap();
    }

and the setUpMap method

public void setUpMap(){

        theGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        theGoogleMap.setMyLocationEnabled(true);
        theGoogleMap.setTrafficEnabled(true);
        theGoogleMap.setIndoorEnabled(true);
        theGoogleMap.setBuildingsEnabled(true);
        theGoogleMap.getUiSettings().setZoomControlsEnabled(true);
    }

And the error is showing in onresume()

java.lang.RuntimeException: Unable to resume activity {com.purpletab.daga/com.purpletab.daga.activities.CoreActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void com.google.maps.api.android.lib6.e.fl.o()' on a null object reference

also

Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void com.google.maps.api.android.lib6.e.fl.o()' on a null object reference

Answer 1

The solution. I was placing a Map Fragment inside a Fragment.

So....

xml to be placed inside the fragment is

 <fragment
                android:id="@+id/contactFrag_F_map"
                android:name="com.google.android.gms.maps.MapFragment"
                android:layout_width="match_parent"
                android:layout_height="200dp"/>

and ..

public class ContactFragment extends Fragment implements OnMapReadyCallback {

with in onCreateView()

MapFragment mapFragment = (MapFragment) getChildFragmentManager().findFragmentById(R.id.contactFrag_F_map);
        mapFragment.getMapAsync(this);

And on OnMapReadyCallback

@Override
    public void onMapReady(GoogleMap googleMap) {

        theGoogleMap = googleMap;

        setUpMap();
    }

and below is the setUpMap.

public void setUpMap(){

        theGoogleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
        theGoogleMap.setMyLocationEnabled(true);
        theGoogleMap.setTrafficEnabled(true);
        theGoogleMap.setIndoorEnabled(true);
        theGoogleMap.setBuildingsEnabled(true);
        theGoogleMap.getUiSettings().setZoomControlsEnabled(true);
    }

works fine.. :)

Answer 2

Don't

googleMap = ((MapFragment) getActivity().getFragmentManager().findFragmentById(
                    R.id.contactFrag_F_map)).getMap();

Do

googleMap = ((MapFragment) getActivity().getSupportFragmentmanager().findFragmentById(
                    R.id.contactFrag_F_map)).getMap();

getSupportFragmentManager

Return the FragmentManager for interacting with fragments associated with this activity.