java - Android: How to draw free on top of anything (any activity) -


how draw view on top of other activities regardless of showing , without using transparent activities or consuming touch events.

its display custom icon on screen on top of other apps reacts when touch can still touch other views on screen.

example: facebook chat heads displays dragable , clickable icon on screen regardless of doing whether on home screen or app menus or app. still can click chat head icon , background app elements seperately

how that?

take @ cool article, think that's want :

http://www.piwai.info/chatheads-basics

in short : want add permission manifest : 

<uses-permission android:name="android.permission.system_alert_window" />

for api >= 23, you'll need request runtime permission settings.action_manage_overlay_permission

then in service, window manager

windowmanager = (windowmanager) getsystemservice(window_service);

and add views addview method


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