Issue
I'm using Android Navigation Component with bottom navigation, lint gives a warning about replacing the <fragment>
tag with <FragmentContainerView>
but when i replaced, findNavController
is not working it gives me error about it does not have a NavController set on
Fragment
<androidx.fragment.app.FragmentContainerView
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/mobile_navigation" />
Activity
val navController = findNavController(R.id.nav_host_fragment)
val appBarConfiguration = AppBarConfiguration(
setOf(
R.id.navigation_classes, R.id.navigation_schedule, R.id.navigation_settings
)
)
setupActionBarWithNavController(navController, appBarConfiguration)
navView.setupWithNavController(navController)
}
Solution
As per this issue, when using FragmentContainerView
, you need to find the NavController
using findFragmentById()
rather than using findNavController()
when in onCreate()
:
val navHostFragment = supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
val navController = navHostFragment.navController
This is because findNavController(R.id.nav_host_fragment)
relies on the Fragment's View to already be created which isn't the case when using FragmentContainerView
(as it uses a FragmentTransaction
under the hood to add the NavHostFragment
).
If you are using Fragment 1.4.0 or higher and View Binding, you can simply this considerably by using the getFragment()
method:
val navController = binding.container.getFragment<NavHostFragment>().navController
Answered By - ianhanniballake
0 comments:
Post a Comment
Note: Only a member of this blog may post a comment.