How do I add an Action Bar/App bar in AppCompat v21?

Question

I need some help from you guys. I'm trying to add an action bar to the new appcompact (AppCompat v21) theme because I don't see any bar when I run the app. By the way, the app is only the basic "Hello World" app. The only things I changed are android:theme="@style/Theme.AppCompat" in Android Manifest and add the module dependency and jars from the new appcompat v7. Maybe it's something wrong with my SDK, but I already installed/unistalled Android Support library. I've included an image below of the app.

Answer 1

It needs to extend ActionBarActivity also.