Determine which process sent message to given process through Binder

Question

In android, some app sends a message to systemui app to hide navigation bar, I want to determine which app sent the message..for furthur use?

Answer 1

As a 3rd party app you cannot see what requested the action through the Binder. It is a 1-to-1 interface between the requesting process and the system framework process (typically system_server.)