double click/tap map zoom (Android) [duplicate]

Question

Possible Duplicate:
Double Tap -> Zoom on Android MapView?

I have an Activity that extends MapActivity. I use Google Maps.
I need to zoom in by double clicking or double tapping.

Can someone help me with this?

I have already looked at the below, but they are not what I'm looking for.

Double Tap -> Zoom on Android MapView?

Fling gesture detection on grid layout

I realized that onTouchListener is being called only once, why is that so?

// set Gesture
detector = new GestureDetector(new GestureReactor());
mapView.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        System.out.println("Inside onTouch");
        return detector.onTouchEvent(event);
    }
});

I have private class:

private class GestureReactor extends SimpleOnGestureListener {
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        System.out.println("inside onDouble");
        controller.zoomInFixing((int) e.getX(), (int) e.getY());
        return super.onDoubleTap(e);
    }
}

and

private GestureDetector detector;

Answer 1

Since you want a copy-paste answer, look here.

EDIT:

In my public class MainMap extends MapActivity I have a field called private MyMapView mv;

I then made a class which extends MapView like this: public class MyMapView extends MapView.

So you just make a new class which extends MapView, copy-paste the code you found in the link in there, and use your new class in your Activity which extends MapActivity.