getFragmentManager to Fragment - android-fragmentactivity

Question

I am trying to convert an activity to a fragment and have problems with getFragmentManager.
my xml file:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context="xpak.probandosidebar.MapsFragment"
class ="com.google.android.gms.maps.SupportMapFragment" />
and my java file:
public class MapsFragment extends Fragment {
private GoogleMap mMap;
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){
return inflater.inflate(R.layout.fragment_maps,container,false);
}
#Override
public void onStart() {
super.onStart();
setUpMapIfNeeded();
}
#Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
//here is the error
mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map))
.getMap();
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}}
the error is: cannot cast android.app.Fragment to com.google.android.gms.maps.SupportMapFragment
I searched everywhere without success , I hope you can help me
greetings from chile

Answer 1

Try doing this
<com.google.android.gms.maps.SupportMapFragment
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/map"
tools:context="xpak.probandosidebar.MapsFragment"
class ="com.google.android.gms.maps.SupportMapFragment" />