[flamming_python]

If nothing else will work then I can try contact author xash3d, maybe

Oh there’s no need for that.
The project is open-source and all their code can be found on GitHub.
Here, I found some code that might prove of interest to you:

https://github.com/FWGS/xash3d-android-project/blob/master/src/in/celest/xash3d/ShortcutActivity.java