[android] NavHostFragment로 FragmentContainerView

사용 FragmentContainerView즉시 작동하지 않는 것 같습니다 .

<androidx.fragment.app.FragmentContainerView
        class="androidx.navigation.fragment.NavHostFragment"
        android:id="@+id/fragment_nav_host"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:navGraph="@navigation/nav_app" />

여기 내 코드가 사용 fragment-ktx:1.2.0-rc01되며 항상이 오류가 발생합니다.

Caused by: java.lang.IllegalStateException: Activity ...MainActivity@797467d does not have a NavController set on 2131296504

<fragment>작품과 AFAIK를 사용 하면로 대체되어야 FragmentContainerView합니다.

나는 뭔가를 놓치고 또는 수있는 사람이 사용 된 FragmentContainerViewA와 NavHostFragment?

많은 감사합니다!

답변

val navHostFragment = supportFragmentManager
    .findFragmentById(R.id.my_nav_host_fragment) as NavHostFragment
val navController = navHostFragment.navController

NavHostFragment navHostFragment =
    (NavHostFragment) getSupportFragmentManager()
        .findFragmentById(R.id.my_nav_host_fragment);
NavController navController = navHostFragment.getNavController();

    super.onCreate(savedInstanceState)

    // Set up the form and list.
    setContentView(R.layout.activity_xxx)

    // Set up navigation - action bar and sidebar.
    /// Let the navigation view check/uncheck the menu items.
    nav_view.post { // wait for NavHostFragment to inflate
        val navController = findNavController()
        nav_view.setupWithNavController(navController)
        nav_view.setNavigationItemSelectedListener(this)
    }

<androidx.fragment.app.FragmentContainerView
    android:name="androidx.navigation.fragment.NavHostFragment"
    ...