Exploring ActionBar
Satya Komatineni, Dave MacLean, Sayed Y. Hashimi · Apress eBooks · 2011
ActionBar is a new API in Android 3.0 SDK. It allows you to customize the title bar of an activity. Prior to the 3.0 SDK release, the title bar of an activity merely contained the title of an activity. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.