How to determine the sender of Broadcast Intent

Question

I have an application that is at the same time a broadcast sender and receiver of standard action android.intent.action.SET_WALLPAPER. I want to do some stuff only in a case

Answer 1

No.

If you only want to do something when an action was broadcast by another app (i.e. not yours), I imagine it should be easy to determine that your app didn't send this broadcast, and therefore it was someone else..