How do I save/restore a `Nav3` `NavBackStack` myse...

# compose

[ursus]

How do I save/restore a Nav3 NavBackStack myself (i.e. not using the rememberNavBackStack -- without resorting to having keys be Parcelable ? (and keeping the @Serializable).

I'm poking inside the rememberNavBackStack but it uses some Saver , not sure how would I pass that into outState: Bundle that onSaveInstanceState provides?

[Ian Lake]

The SavedState Release Notes talk about how SavedState integrates with KotlinX Serialization, which is what NavBackStack uses.

In places like your activity, you can use the by saved which does all the work for you:

val backStack by saved { NavBackStack() }

You should probably stop overriding most methods in your activity at all, you don't really need to do that in 2026 anymore 🙂

[ursus]

private val backStack by saved(serializer = NavBackStackSerializer(NavKeySerializer())) {
    NavBackStack()
}

for completeness, otherwise runtime crash