Creating a system overlay window (always on top)

Question

I\'m trying to create an always-op-top button/clickable-image which stays on top of all the windows all the time.

The proof of concept is

• here - Smar

Answer 1

It uses permission "android.permission.SYSTEM_ALERT_WINDOW" full tutorial on this link : http://androidsrc.net/facebook-chat-like-floating-chat-heads/