Catzie.net Blog

Tag: navigation component

  • Two NavHosts with their own NavControllers and NavGraphs (Navigation Component) //Android Kotlin Dev Diary

    I am trying to make a single-activity app because I’d like to easily share data across screen using, ideally one, or as few as possible ViewModels.

    NavGraph 1

    Host: Layout file of MainActivity

    Destination(s): CreateLogFragment

    NavGraph 2

    Host: Layout file of CreateLogFragment

    Destination(s): CreateLogFoodFragment, CreateLogNotesFragment

    (CreateLogFragment has a BottomNavigationBar that switches between CreateLogFoodFragment and CreateLogNotesFragment)

    The problem was that NavGraph 2 was not getting the correct NavHost and NavController in the CreateLogFragment class.

    And the solution is to retrieve the NavHost in CreateLogFragment like so:

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

        val navHostFragment = childFragmentManager.findFragmentById(R.id.nav_host_create_log) as NavHostFragment
    val navController = navHostFragment.navController

    // Setup Bottom Nav
    val bottomNav: BottomNavigationView = binding.bottomNav
    bottomNav.setupWithNavController(navController)
}

    I’d like to write a full tutorial on how to do this but I’m not sure if I could spare some time. If you’ve been reading my recent posts you’ll notice that I’m not able to put it so much effort in explaining everything. These days I’m always in a hurry to finish stuff. But I’ll still try!!

  • Error inflating class androidx.fragment.app.FragmentContainerView // Android Kotlin Dev Diary

    The cause of error in Logcat:

         Caused by: android.view.InflateException: Binary XML file line #9 in net.catzie.sampleapp:layout/activity_main: Binary XML file line #9 in net.catzie.sampleapp:layout/activity_main: Error inflating class androidx.fragment.app.FragmentContainerView
     Caused by: android.view.InflateException: Binary XML file line #9 in net.catzie.sampleapp:layout/activity_main: Error inflating class androidx.fragment.app.FragmentContainerView
     Caused by: java.lang.IllegalStateException: no start destination defined via app:startDestination for net.catzie.sampleapp:id/nav_graph

    The fix was to add a startDestination to <navigation> tag in the nav_graph.xml.