How to specify the order of back press handlers?

[evjava]

I want to specify the order of handlers like follows:

1. close drawer (if open)
2. close search (if expanded)
3. handle backpress by component (if can)
4. router.pop
5. handle double-press (first press for toast "press twice to exit", second quick press for exit)

I can implement all these handlers, but I don't understand, how to tangle them together in correct order.

Is there some API to do it? As I see, the order isn't specified, moreover, router calls pop after other handlers.

Sub question: is it possible to access router.backstackSize from outside? Probably it can help me.