This question already has an answer here:
Since the version 22.1.0, the class ActionBarActivity is deprecated. You should use AppCompatActivity.
Read here and here for more information.
According to this video of Android Developers you should only make two changes
android developers documentation says : "Updated the AppCompatActivity as the base class for activities that use the support library action bar features. This class replaces the deprecated ActionBarActivity."
checkout changes for Android Support Library, revision 22.1.0 (April 2015)
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