Null pointer exception at mapFragment.getMapAsync(this) while initializing google map

Question

When I use v6.5.87 of Google Play Services, I get a null pointer exception when I call getMapAsync(). I'm using a SupportMapFragment in my Fragment's xml layout.

My code:

SupportMapFragment mapFragment = (SupportMapFragment) getActivity()
        .getSupportFragmentManager().findFragmentById(R.id.mapFragment);

mapFragment.getMapAsync(this);

Note: There's no problem when calling getMap() on older Google Play Services versions, but getMap() is now deprecated (docs).

Here's the stack trace for the NPE:

java.lang.NullPointerException
            at com.decos.fixi.fragments.FragmentLocationMap.initializeMap(FragmentLocationMap.java:132)
            at com.decos.fixi.fragments.FragmentLocationMap.onCreateView(FragmentLocationMap.java:95)
            at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
            at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
            at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
            at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4921)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

Finally I got the answer!

SupportMapFragment mapFragment = (SupportMapFragment) this.getChildFragmentManager()
                .findFragmentById(R.id.mapFragment);

instead of

SupportMapFragment mapFragment = (SupportMapFragment) this.getSupportFragmentManager()
                .findFragmentById(R.id.mapFragment);

getChildFragmentManager() did the trick.

Answer 2

In addition, If you are using SupportMapFragment mapFragment = (SupportMapFragment).....

Then be sure you have set this class attribute in XML

class="com.google.android.gms.maps.SupportMapFragment"

Not

class ="com.google.android.gms.maps.MapFragment"