NavController no current navigation node after device rotation

Question

I am making app, which supports different device orientations. Navigation is carried out by Android Jetpack\'s Navigation. App main screen for landscape orientation is prese

Answer 1

The problem for me was the version of lifecycle dependency

"androidx.lifecycle:lifecycle-extensions:$lifecycle_version

version '2.2.0' cause the problem, I returned to use '2.1.0'

lifecycle_version = '2.1.0'

Answer 2

None of these solutions fixed my issue.

I fixed it by including my nested graph into the main graph.

I have a nav_main which includes a nav_sub_1.
nav_sub_1 also includes another sub graph, nav_sub_2
When I tried to start my activity by setting nav_sub_2, the IllegalStateException occured

java.lang.IllegalStateException: no current navigation node

But this would not happen by setting nav_main or nav_sub_1.

My main graph nav_main looks like this:

<navigation
    <fragment...>
    <include app:graph="@navigation/nav_sub_1
<navigation/>

and nav_sub_1:

<navigation
    <fragment...>
    <include app:graph="@navigation/nav_sub_2
<navigation/>

I included nav_sub_2 in nav_main and the issue was fixed!

<navigation
    <fragment...>
    <include app:graph="@navigation/nav_sub_1
    <include app:graph="@navigation/nav_sub_2
<navigation/>

Answer 3

Thanks to Slav's comment, he was right. I updated navigation module to 2.2.0 navigation_version = '2.2.0' in app's module build.gradle

implementation "androidx.navigation:navigation-fragment-ktx:$navigation_version"
implementation "androidx.navigation:navigation-ui-ktx:$navigation_version"

After doing this problem is no longer appears, looks like that was a bug in navigation.

Answer 4

You can also fix it like this. In your host activity in manifest adding this atribute:

<activity android:name=".MainActivity"
        android:configChanges="orientation|screenSize|smallestScreenSize|screenLayout"

But the best way is change your dependencies for navigation from:

implementation "android.arch.navigation:navigation-fragment-ktx:$navigation_version"
implementation "android.arch.navigation:navigation-ui-ktx:$navigation_version"

to

implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
implementation "androidx.navigation:navigation-ui-ktx:$nav_version"