@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
final SurfaceView surfaceView = (SurfaceView) view.findViewById(R.id.map_surfaceview);
surfaceView.getHolder().addCallback(this);
}
@Override
public void onCreate(Bundle b) {
super.onCreate(b);
setRetainInstance(true);
}