Display an item's name as the title on the Action Bar

Display an item's name as the title on the Action Bar

I'm working on an app that displays all the contact names in a ListView.
On click, the app displays all the details of that contact in another
activity. I want to display the contact name as a title on the action bar
on the other activity, so that the user can see the contact name on the
action bar that he clicked on.