The Paranoid Android family of custom ROMs has a history of adding interesting custom user interface elements, but since re-starting with KitKat, the developers have been trying out some new ideas. One of the first new features for the revamped PA is called Hover, and it's basically a complete rethinking of the Halo idea. Hover is a short-lived visual overlay that temporarily replaces the notification bar with a richer and more useful version, including expandable alerts and floating windows.
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