How to overlay your View on top of other applications?

Question

Android

Good afternoon!
Tell me how to overlay your View on top of other applications in android?
Like in this app https://play.google.com/store/apps/details?id=info...

Answer 1

You need a System Alert Window :
Here is an article showing how to implement this.
And this is the finished library.
By the way, do not forget to specify this permission in the manifest.