which has quite some code to support multiple back stacks kotlinlang #android

Jetpack Navigation doesn't support multiple backstacks out of the box yet. We use separate (xml) navgraphs with the linked extension and so far it works.

Remy Benza

02/07/2020, 2:03 PM

Phew, together with a colleague after couple hours of debugging we found out the order nav graphs id's matter. We first got very weird behavior of multiple fragments on top of each other.

Roman Q.

02/07/2020, 2:05 PM

They have to match, yes. ^^

Remy Benza

02/07/2020, 2:08 PM

Well the nav graphs id's did match the bottom nav menu id's. But that's not enough. This order also needs to match:

private fun setupBottomNavigationBar() {
    val navGraphIds = listOf(
            R.navigation.feed_nav_graph,
            R.navigation.discover_nav_graph,
            R.navigation.add_experience_nav_graph,
            R.navigation.trips_nav_graph,
            R.navigation.notifications_nav_graph)

    // Setup the bottom navigation view with a list of navigation graphs
    val controller: LiveData<NavController> = binding.globalBottomNav.setupWithNavController(
            navGraphIds = navGraphIds,
            fragmentManager = supportFragmentManager,
            containerId = R.id.global_nav_host_fragment,
            intent = intent
    )

Roman Q.

02/07/2020, 2:10 PM

That's what I meant, yep. I remember that Ian Lake said sometime it's necessary to rewrite parts of the fragment in order to support multiple backstacks out of the box. So I guess one has to live with that for now. ^^

Freedom

02/08/2020, 1:29 AM

It might messy to use just one activity this is how I break mine down if I have authentication I would create a graph to handle only auth then another graph for dashboard if dashboard has like account section and account has children I,LL create a graph to handle it children

Just to avoid mess and keep a clean code

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