In Android 3.0, when you select some text for example, the ActionBar switches to a ContextMenu-like mode, which enables you to do actions with the selected text: copy/share/etc, and a "Done" button appears on the left side to enable the user to leave this mode.
How can I switch the ActionBar into this mode in my app (with my menu items of course)? I just couldn't find this in the docs.
Yeah, I couldn't find it either -- I had to ask at Google I|O.
Use startActionMode(). Here is one of their samples that demonstrates it. I need to do more work in this area myself.