Playing with "supporting-devices" training.

http://developer.android.com/training/basics/supporting-devices/index.html
DAC/Training: Different Languages

http://developer.android.com/training/basics/supporting-devices/languages.html
DAC/Training: Try to toggle ActionBar.
DAC: Saving Key-Value Sets

http://developer.android.com/training/basics/data-storage/shared-preferences.html