Actually there is no problem Project compiles and runs But I can t understand what is mean strikeout class name Android Studio tells that there is deprecated code is used Can anybody explain

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

According to this video of Android Developers you should only make two changes

[android] ActionBarActivity is deprecated

Since the version 22.1.0, the class ActionBarActivity is deprecated. You should use AppCompatActivity.

Read here and here for more information.

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