I am trying to implement the new ActionBar support library that was released by Google a couple days ago. In the past, I have successfully implemented ActionBarSherlock wit
I will share my experience with this problem. I was going crazy because of this, but I found out that the problem was a bug with Eclipse itself, rather than my code: In eclipse, unable to reference an android library project in another android project
So, if you have the Android Support Library in your C: drive and your project in the D: drive on your computer, Eclipse won't function correctly and won't know where the Android Support Library is (green tick turns into red cross). To solve this, you need to move both projects onto the same hard drive.