How facebook app implements draggable floating Button - android

I´m trying to get some information about how I could implement such a Button like Facebook does in the new version of the app. Actually I am not sure if this button comes from Facebook or from Facebook messenge app but it was the easiest way to have an example of what I would like to achieve.
They add a draggable floating Button anywhere you are when getting a new message notification, anybody has and idea about how they achieved that?
Thanks in advance.
Edited:
Toucher: other app which uses what I´d like to achieve. Just below can find a link from Google Play
https://play.google.com/store/apps/details?id=com.gau.go.touchhelperex&feature=nav_result#?t=W251bGwsMSwxLDMsImNvbS5nYXUuZ28udG91Y2hoZWxwZXJleCJd

see if this help
http://forum.xda-developers.com/showthread.php?t=1688531
this library has drag view outside the app

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