Android: Market design philosophy?

Question

I am assuming that the Android Market app source code is closed but I have a few questions regarding this:

1. Why didn't they follow the tabbed UI design which is normally followed? (Is it only because they had more activities to display?)
2. How would I go about designing an app like this? I first set up the gallery view and attach an onClick event listener to it. But, upon receiving a click, what should I do? Do I have to use a framelayout or something?

Thanks

Answer 1

I can't speak to market design philosophy, but what it looks like is a vertical LinearLayout with header section containing a header with a search ImageButton, then 3 buttons and the content area which behaves like ViewFlipper. Mark Murphy has a great section in his book on the ViewFlipper as well as article on Android guys