how best to cope with different versions of Android?

Question

I have an app that works fine in Android 1.x but not in Android 2.x i need to do things different based on the version of Android the app is running on (querying contacts).

Answer 1

The Business Card example that comes with the latest Android SDK was a big, big help. I recommend it to those that like me might not be a professional full-time developer. Thanks everyone for your kind input.