:compass: <Accompanist’s >`bottomSheet` ’s navEntry not maintained ( Details inside :thread:)

# compose

[theapache64]

🧭 Accompanist’s `bottomSheet` ’s navEntry not maintained ( Details inside 🧵)

[cb]

@jossiwolf

[theapache64]

Scenario:
I’ve three screens A, B and C.
A and C are navigation-compose’s composable
B is Accompanist’s `bottomSheet`

When navigate from A -> B -> C and then press back button from C, the app goes to A rather than B

Is there anyway to keep the bottomSheet’s state so that when back button pressed it’ll go to B ?

[jossiwolf]

Afaik, there's no way to do that. Bottom Sheets are floating window destinations, same as dialogs. That means that they're automatically popped off the back stack when you navigate to a new destination.
cc @Jeremy Woods about customizing that behavior 🙂

[theapache64]

Okay.
@Jeremy Woods is it possible to do? If yes, i can raise a feature request?

[Nathan]

Could you maybe just relaunch B when you get back to A based on some state value you’d have to keep track of ?

[Jeremy Woods]

No, it's not possible. Me and Ian discussed it for a while and there is no good way for navigation to manage dialogs within the back stack. You can stack FloatingWindows on top of each other, but once you add a regular destination, we pop them all. Here was the explanation pre-Compose https://issuetracker.google.com/134089818#comment7 and I don't think any of those factors have changed.

[theapache64]

@Nathan that might work.
@Jeremy Woods okay, so what’s the recommended approach to achieve this behaviour? what are your thoughts abt @Nathan’s solution?

[Jeremy Woods]

It makes sense. The one thing I would note is that the state of the dialog won't be saved.

[theapache64]

I can use a viewmodel for that. That would work, right?

[Jeremy Woods]

Now that I think about it, you might even be able to use the popUpToSavedState and restoreSavedState APIs we added for multiple back stacks. https://developer.android.com/guide/navigation/navigation-navigate#savestate

[theapache64]

Ohh okay. I thought it wouldn't work with this. I'll give it a try

[Jeremy Woods]

I haven't tried it, but in theory we should be able to save and restore the back stack entry associated with the dialog.

[theapache64]

Ookay

[theapache64]

yes! it works!

2021-08-15 15-28-04.mp4

[theapache64]

Note: the code can be improved. consider this as a draft version.

[theapache64]

Wrote a small article on how to achieve this: https://medium.com/@theapache64/saving-bottomsheets-state-%EF%B8%8F-d9426cafbcbb