how to pop the backstack I’m not currently on / all multiple backstacks at once (e.g. on logout)? [t...

# compose

[solidogen]

how to pop the backstack I’m not currently on / all multiple backstacks at once (e.g. on logout)? [thread]

[solidogen]

I have multiple backstacks - ABCDE (bottom nav)
• I start with “A” (as already logged in user)
• I go to C, then a level deeper to some details screen C2
• I go to E, which has logout button
• logout does popBackstack to “A”
• “A” conditionally navigates me to Login screen, because I’m logged out
• Logging in navigates to “A”
• C2 is still restored on the other stack
I need to pop all stacks to default state while logging out - so next logged in user has the same experience as if cold app run happened

If needed, my navigation from login back to “A” looks like this:

val homeRoute = AppScreen.Home.createRoute(root)
navController.navigate(route = homeRoute) {
   popUpTo(homeRoute) {
      inclusive = true
   }
   restoreState = false
}

[Artur L]

Change popUpTo(C) { inclusive = true }

[solidogen]

change = add this line? at which point?

[solidogen]

I’m not able to modify stack C while being on stack A

Ignoring popBackStack to destination 706351978 as it was not found on the current back stack

[solidogen]

the issue is, there are multiple backstacks and I can be levels deep in all of them at the same time.
I can be at A2, B2, C2 etc, then I have to reset them to their roots after logout. This way freshly logged-in user doesn’t have any nesting which previous user navigated into

[Artur L]

navController.backQueue.retainAll(arrayListOf(navController.getBackStackEntry("Startroute")))

[Ian Lake]

Never, ever, ever, ever access the private backQueue

[Ian Lake]

It sounds like you want to be calling navController.clearBackStack(), which is what clears a saved back stack

[Artur L]

You must have route or destinationid. How to clear all except Start destination

[solidogen]

thanks a lot @Ian Lake.
so I solved this by looping over backstack roots to call clearBacktack on each of them, then navigated to first root graph - which makes it exactly how fresh start would look like