Android GoogleMap or SupportMapFragment - null pointer exception

Question

In my app i showing google map version2 in a fragment. but i get Null pointer exception at

mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id

Answer 1

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);
    }