Android Question screenshot (any app) from my service

https://www.b4x.com/android/forum/threads/take-a-screenshot-with-inline-java-code.86798/#content
Dont know if it works from a service. I gues no.
You only can make a snapshot of your app activities.

Yes, here is the context used of activity. But how to check a remote device's screen, if any content there.
Maybe open a transparent activity before screenshoting ?

UPD: transparent activity for making the screenshot is ... stupid idea , tested (just black screen)

This should work: https://www.b4x.com/android/forum/threads/b4a-screenrecorder-screenshots.71348/#content