GetMap () de SupportMapFragment devuelve null

Estoy intentando crear un SupportMapFragment dinámicamente y ponerlo en un contenedor de FrameLayout .

Mi problema es que mMapFragment.getMap() devuelve null …

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¿Alguien puede ayudar?

CenterMapFragment.java

 public class CenterMapFragment extends Fragment { private SupportMapFragment mMapFragment; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.center_map_fragment, container, false); } @Override public void onActivityCreated (Bundle savedInstanceState){ super.onActivityCreated(savedInstanceState); if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity()) == ConnectionResult.SUCCESS) { setUpMapIfNeeded(); } } private void setUpMapIfNeeded() { if (mMapFragment == null) { mMapFragment = SupportMapFragment.newInstance(); FragmentTransaction fragmentTransaction = getChildFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.map, mMapFragment); fragmentTransaction.commit(); setUpMap(); } } private void setUpMap() { GoogleMap map = mMapFragment.getMap(); // map is null! } @Override public void onResume() { super.onResume(); setUpMapIfNeeded(); } } 

Center_map_fragment.xml

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <FrameLayout android:id="@+id/map" android:layout_width="match_parent" android:layout_height="match_parent" > </FrameLayout> <Button android:id="@+id/btn_loc" android:layout_width="60dp" android:layout_height="50dp" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:background="@drawable/locbtn" /> </RelativeLayout> 

 public class MapFragment extends Fragment { MapView m; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // inflat and return the layout View v = inflater.inflate(R.layout.map_fragment, container, false); m = (MapView) v.findViewById(R.id.mapView); m.onCreate(savedInstanceState); return v; } @Override public void onResume() { super.onResume(); m.onResume(); } @Override public void onPause() { super.onPause(); m.onPause(); } @Override public void onDestroy() { super.onDestroy(); m.onDestroy(); } @Override public void onLowMemory() { super.onLowMemory(); m.onLowMemory(); } } 

 fragmentTransaction.commit(); 

 getFragmentManager().executePendingTransactions();