The basic UI design patterns Android apps

Since the development of applications for Android is gaining popularity, think review of major UI patterns for Android-applications will be useful to someone. Pending patterns: Dashboard, Action Bar, Quick Actions, Search Bar and Companion Widget. 

In my opinion theme UI patterns is important for several reasons:

1. Attracting users: patterns help make the application more usability, easier to understand.
2. Entrance to the market: following patterns may play an important role in promoting the application on the app market'y.
3. It is not necessary to build a bicycle with a knowledge of patterns is much easier to be engaged in designing application interface, using existing solutions.