Android UI Design

1)  http://androidniceties.tumblr.com/

2) http://android-arsenal.com/

3) Circular image view

    https://github.com/lopspower/CircularImageView
4) Short cut icon bagde

https://github.com/leolin310148/ShortcutBadger

App icon change dynamically

https://github.com/eldhosembabu/mathokkil

5) Example with source code

https://github.com/Trinea/android-open-project/tree/master/English%20Version

6) Lolipop design template
http://capptivate.co/

7) http://www.lovelyui.com/

8) http://www.pttrns.com/