I have recently started working with Google Map v2 and figured it out lot of things have been changed. Previously I was using Google Map v1 so I was using the concept of Map
Just add a circle to the map using googleMap.addCircle(...)
see documentation
Update:
I did exactly as I said to do and I had no problem doing what you want
here is the code, super simple super basic....
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view = super.onCreateView(inflater, container, savedInstanceState);
GoogleMap map = getMap();
int radius = 500;
for(int i=0; i<5; i++){
map.addCircle(new CircleOptions().center(new LatLng(0,0)).radius(radius).fillColor(0x30000000).strokeWidth(3));
radius += 500;
}
return view;
}