How to implement wheel widget like in iPhone?

Question

I would like to implement a time settings wheel widget like the one iPhone has (http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/art/ui_datetimepicker.jpg).

1. Should I use GlSurfaceView or just extend View?
2. Should I make it as a compound View (it would consist of several Views) or draw everything on the Canvas in onDraw?
3. In case I won't extend GlSurfaceView, how to do (smooth) animations? Start a Thread and call postInvalidate()?

Answer 1

http://code.google.com/p/android-wheel/

Answer 2

I've put my code for an animated wheel widget here:

http://code.google.com/p/smooth-wheel/