title: Android actionbar tabs compatibility with 2.2
body: <p>Hi i have rectly start working with android 4.0's action bar and tabs but when i trying to open the app on 2.2 it crashes. And i wonder how i should do so it can be compatible with 2.2+
  Is it like layout for diffrent versions like you name a foler v8-layout or somethig like that?</p>
  
  <p>thanks and sorry for my english grammar :)</p>