Sorry, I misunderstood you. Of course I use StarterService but I did not know that it is the same as Service Module.
I use it in foreground mode so it is running all the time.
I can call from current activity in the place
Sub Activity_Pause (UserClosed As Boolean)
End Sub
a SUB from Service Module and do something but how to detect that currently activity was unpaused and switch my aplication to Main Activity