I had to extend my Activity with theme Theme.AppCompat.Light.Dialog from ActionBarActivity before and now from AppcompatActivity, because my Base Activity extends this one.
But now with new appcompat v7 (v22) library my Activity started to show title bar despite the fact that i use custom style with items windowActionBar=false, android:windowNoTitle=true. But until appcompat library upgraded there isn't such problem, title bar wasn't showed.
If my activity extends FragmentActivity everything is ok and i understand that maybe i use a bad pattern that my dialog activity extends from AppcompatActivity but i would like to know is there a way to remove title bar?
Try to add this code on your manifest, specifically, to the activity that you want to disappear its
Actionbar
:hope it helps :D