In the new update Google has released a new API support library, that supports the ActionBar in API level 7+.
I used ActionBarSherlock until this update and I wrot
I'd like to add a little to the answer.
If you want to see both text and an icon, please use withText in showAsAction I've just tested it; when I used always or ifRoom without withText, I only saw an icon.
withText
showAsAction
always
ifRoom