Android Home 화면에 Floting 띄우기

http://www.addictivetips.com/android/floata-add-a-floating-button-to-your-screen-to-tweet-from-any-app/

 

https://droidqd.wordpress.com/2015/01/07/how-to-make-a-floating-face-bubble-on-home-screen-in-android/