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

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.