NavHostFragment not accessible from XML

Apparently, see here and here, the use of the Jetifier and Android X is still under refactor, In this google i/o talk they've asked us to wait for Canary 15 which has some bug fixes.

Try to use the navigation library with the old support library for now.

Edit: Android Studio 3.2 Canary 15 is available for download, everything's working fine for the navigation library. After you've finished installing clear up the clutter invalidating the cache to see if it goes fine.

Yep, as mentioned by Levi Albuquerque, this is a known bug in latest Canary Android Studio release (14). You can vote to this bug, subscribe and provide some useful information here.

Update:

Issue will be fixed in Android Gradle plugin 3.2.0-alpha17

I also just have this headache as I am following Android Kotlin Fundamental tutorial at https://codelabs.developers.google.com/codelabs/kotlin-android-training-add-navigation/index.html#3 Here is the code that works for me

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

Apparently the tutorial has not been updated. Also in the dependency need to update the library ..

....    
implementation "androidx.navigation:navigation-fragment:2.3.0"
implementation "androidx.navigation:navigation-ui:2.3.0"

I am using Android Studio 4.0.

NavHostFragment is not accessible?android:name="androidx.navigation.fragment.NavHostFragment

So in your build.gradle, just add this two dependencies -

For Java:-

dependencies {
def nav_version = "2.3.0"

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

}

For Kotlin:-

dependencies {
def nav_version = "2.3.0"

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

}

Reference Link:- https://developer.android.com/jetpack/androidx/releases/navigation