android.support.v7.app.ActionBarActivity is deprecated

The line across ActionBarActivity means that it has been deprecated. Its just another way of denoting it. You should now use AppCompatActivity instead starting with version 22.1.0.

You can read more here.

Use

android.support.v7.app.AppCompatActivity

instead of

android.support.v7.app.ActionBarActivity (DEPRECATED)

and extends AppCompatActivity

    public myClass extends AppCompatActivity{
...
...

if you have the message:

cannot resolve symbol AppCompatActivity

You have to update to the last support library in your Android SDK Manager