www.androidpatterns.com is a Android interaction design pattern collection founded and maintained by a Dutch interaction design company called UNITiD and group of contributors.
The website works much like a moderated wiki. People can contribute new patterns and modify existing ones. The patterns are described clearly with nice wire frames complemented with set of screenshots from existing applications and clear explanations.
This website is probably the most complete list of Android interaction patterns in the web today and definitely worth taking a look and bookmarking!