When using androidx.fragment.app.FragmentContainerView
as a navHost instead of a regular fragment
app is not able to navigate to a destination after orientation change.
I get a following error:
java.lang.IllegalStateException: no current navigation node
Is there a gotcha that I should know about to use it properly or is my way of using nav components is incorrect?
Simple activity xml with a view:
...
<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:layout_behavior="@string/appbar_scrolling_view_behavior"
app:navGraph="@navigation/nav_simple" />
...
Navigation code:
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_legislator.xml"
app:startDestination="@id/initialFragment">
<fragment
android:id="@+id/initialFragment"
android:name="com.example.fragmenttag.InitialFragment"
android:label="Initial Fragment"
tools:layout="@layout/initial_fragment">
<action
android:id="@+id/action_initialFragment_to_destinationFragment"
app:destination="@id/destinationFragment" />
</fragment>
<fragment
android:id="@+id/destinationFragment"
android:name="com.example.fragmenttag.DestinationFragment"
android:label="Destination Fragment"
tools:layout="@layout/destination_fragment" />
</navigation>
Here is a github repo where you can easily reproduce a bug: https://github.com/dmytroKarataiev/navHostBug
The no current navigation node
error occurs when there's no graph set and you attempt to call navigate()
. If it only occurs when you're using FragmentContainerView
and after a configuration change, then this would be related to this bug, which is fixed and scheduled for release with Navigation 2.2.0-rc03.
To work around this issue, you can either switch back to <fragment>
or remove app:navGraph="@navigation/nav_simple"
and instead call navController.setGraph(R.navigation.nav_simple)
.