Android jetpack navigation component result from dialog

Question

So far I\'m successfully able to navigate to dialogs and back using only navigation component. The problem is that, I have to do some stuff in dialog and return result to the fr

Answer 1

Thanks to @NataTse and also the official docs, i came up with the extensions so that hopefully less boilerplate code to write:

fun Fragment.setNavigationResult(key: String, value: T) {
    findNavController().previousBackStackEntry?.savedStateHandle?.set(
        key,
        value
    )
}

fun Fragment.getNavigationResult(@IdRes id: Int, key: String, onResult: (result: T) -> Unit) {
    val navBackStackEntry = findNavController().getBackStackEntry(id)

    val observer = LifecycleEventObserver { _, event ->
        if (event == Lifecycle.Event.ON_RESUME
            && navBackStackEntry.savedStateHandle.contains(key)
        ) {
            val result = navBackStackEntry.savedStateHandle.get(key)
            result?.let(onResult)
            navBackStackEntry.savedStateHandle.remove(key)
        }
    }
    navBackStackEntry.lifecycle.addObserver(observer)

    viewLifecycleOwner.lifecycle.addObserver(LifecycleEventObserver { _, event ->
        if (event == Lifecycle.Event.ON_DESTROY) {
            navBackStackEntry.lifecycle.removeObserver(observer)
        }
    })
}