Frankly I am a bit surprised by this question
Need not to surprise too much Rohan.... Since, if the platform supports UI doesn't meant that it provides very Rich UIs. Moreover, I'm new to Android, just want to confirm with the Author. That's all.
Because one of the post Author was relating Android with Java
SE. IMO, java SE doesn't provide a rich UI collection in the early stage of the product released, in fact even now.