rememberSaveable

rememberSaveable

SavedStateHandle

rememberSaveable

SaveableStateRegistry

rememberSaveable

rememberSaveable

SaveableStateRegistry

rememberSaveble

SavedStateHandle

fun <T : Any> SavedStateHandle.saveableMutableStateOf(
    key: String,
    saver: Saver<T, out Any> = autoSaver(),
    init: () -> T
): MutableState<T> {
    // To be honest, I'm not sure why rememberSaveable does this
    // vs just have the saver of type Saver<T, Any>
    @Suppress("UNCHECKED_CAST")
    (saver as Saver<T, Any>)

    // value is restored using the SavedStateHandle or created via [init] lambda
    val value = mutableStateOf(run {
        val restored = get<Bundle>(key)?.get("value")?.let {
            saver.restore(it)
        }
        restored ?: init()
    })

    // Hook up saving the MutableState to the SavedStateHandle
    setSavedStateProvider(key) {
        val saverScope = SaverScope { true }
        with (saver) {
            bundleOf("value" to saverScope.save(value.value))
        }
    }
    return value
}

by mutableStateOf()

class SavingTestViewModel(savedStateHandle: SavedStateHandle) : ViewModel() {
    var saved by savedStateHandle.saveableMutableStateOf("key") { "initialState" }
}