I use ActionBarSherlock with theme Theme.Sherlock.ForceOverflow (for using on pre Honeycomb devices) and I need turn off blue line under my ActionBar....is it possible?
SOLUTION: here
I'm not sure if you can remove the bar but you could change the colour of the bar to match that of the background colour?
If you want to try it try this:
<item name="android:background">@drawable/your_theme_name</item>
<item name="background">@drawable/your_theme_name</item>