Android MapActivity onLongPress / zooming mix up

I have a class extending MapActivity which has an overlay attached to it extending ItemizedOverlay. Inside the overlay I have a GestureDetector and a OnGestureListener. Now for my problem:

I have an action which triggers in the onLongPress of the OnGestureListener but Android triggers this even when you zoom in / out using the "pinch" gesture. T开发者_开发百科his is due to the fact that one finger tends to stay in one spot while the other one moves towards / away. What kind of calls or checks could be implemented to detect whether the action is a pinch-zoom or a longPress, so I know to either handle or disregard in onLongPress?