Difference between ActionBarSherlock and ActionBar Compatibility

Question

What is the difference between ActionBarSherlock and Action Bar Compatibility

Fews days ago Google just released the ActionBar Compatibility that make me so confused

Answer 1

Maybe we should update the answer because google published offical Actionbar support since API18?

block below is from offical blog about these two libraries:

If you’re using a third-party solution (such as ActionBarSherlock), there are a few reasons to consider upgrading:

• Can be kept updated as the Action Bar API evolves.
• Integrated Ancestral Navigation support.
• Use of framework Menu and MenuItem classes.
• Continue to use the Support Library's Fragment class.
• Integrated support for ActionBarDrawerToggle for use with DrawerLayout.
• Backport of PopupMenu.

ActionBarSherlock is a solid and well-tested library which has served developers very well for a long time. If you are already using it and do not currently require any of the above then there is no need to migrate.