private fun <T : Any> SavedStateHandle.saveableMutableStateOf(
    key: String,
    saver: Saver<T, out Any> = autoSaver(),
    init: () -> T,
): MutableState<T> {
    @Suppress("UNCHECKED_CAST")
    (saver as Saver<T, Any>)
    val value = mutableStateOf(restoreOrInit(key, saver, init))
    saveToStateHandle(key, saver, value)
    return value
}

private fun <T : Any> SavedStateHandle.restoreOrInit(
    key: String,
    saver: Saver<T, Any>,
    init: () -> T,
): T = run {
    val restored = get<Bundle>(key)?.get("value")?.let(saver::restore)
    restored ?: init()
}

private fun <T : Any> SavedStateHandle.saveToStateHandle(
    key: String,
    saver: Saver<T, Any>,
    value: MutableState<T>,
) = setSavedStateProvider(key) {
    val saverScope = SaverScope { true }
    with(saver) {
        bundleOf("value" to saverScope.save(value.value))
    }
}

...
//usage
private var _state by savedStateHandle.saveableMutableStateOf(STATE) { initialState }

this used to work but now in

1.2.0-alpha07

setting

_state

doesn’t save value to

SavedStateHandle

How are you checking whether the value is saved to the

SavedStateHandle

? The saved state provider utility will only save the value when the entire

SavedStateHandle

is being saved, so just setting

_state

won’t immediately change what is stored in the

SavedStateHandle

. Also the latest versions of

androidx.lifecycle

(

2.5.0-beta01

was just released!) now includes some of these utilities that you can use.

I don’t quite understand what you are trying to say. btw, are there any examples of how can I bridge

SavedStateHandle

and

MutableState

?

In unit tests how are you checking saved state? And yep! There are examples in the docs here using the new built-in versions of these utilities: https://developer.android.com/reference/kotlin/androidx/lifecycle/SavedStateHandle#(androidx.lifecycle.SavedStateH[…]aveable.Saver,kotlin.Function0)

private var _state: State by savedStateHandle.saveable(STATE) { mutableStateOf(initialState) }
    val state: State
        get() = _state

this doesn’t work, am I doing it right? that’s how it is in the docs. I tried with the app, not unit tests this time

Yeah, that should work it seems… can you open up a bug with a reproducing sample for us to take a look at?

I will, thanks for the link