如何支持 Map<String, Boolean> for rememberSaveable？

Question

使用下面的

var state by rememberSaveable {
    mutableStateOf(
        enumValues<NavigationItem>().associate { it.route to true }
    )
}

enum class NavigationItem(val route: String, val icon: Int) {
    Home("home", R.drawable.ic_home),
    Music("music", R.drawable.ic_music),
    Movies("movies", R.drawable.ic_movie),
    Books("books", R.drawable.ic_book),
    Profile("profile", R.drawable.ic_profile)
}

rememberSaveable 没有保存和恢复状态。

如何保存和恢复？

Answer 1

看起来确实可以保存。但是它有一些错误并且没有以正确的顺序恢复。所以制作我们自己的保护程序会有所帮助

var state by rememberSaveable(
    saver = mapSaver(
        save = { it.value },
        restore = { mutableStateOf(it as Map<String, Boolean>) }
    )
) {
    mutableStateOf(enumValues<NavigationItem>().associate {
        it.route to true
    })
}