In this sample I'm using OpenGL ES 2.0 to draw over other apps and Android system UI.
This project is related to my blog post about using system overlay windows on Android. You can find more information at the following link
www.sisik.eu/blog/android/other/overlay
Whole project is licensed under the Apache License 2.0 except for the bugjaeger_icon.png file. The bugjaeger_icon.png contains the icon of the Bugjaeger app. You can use the icon png file for presentational purposes within this project, but you need to clearly state that it is part of the Bugjager app and give the following link to the app's store listing
https://play.google.com/store/apps/details?id=eu.sisik.hackendebug