Error inflating class Fragment, when adding navGraph attribute

Question

I know there are a few questions and answers about this problem, but none of the solutions fixed my problem. I get an

android.view.InflateException: Binary XML file line #11: Binary XML file line #11: Error inflating class fragment

error, when I add the navGraph attribute with the navigation xml-file.

So here is my activity_login.xml (with the fragment container):

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".LoginActivity">

<fragment
    android:name="androidx.navigation.fragment.NavHostFragment"
    android:id="@+id/loginFragmentContainer"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:defaultNavHost="true"

    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"

    app:navGraph="@navigation/nav_graph"/>

</androidx.constraintlayout.widget.ConstraintLayout>

The nav_graph.xml is just as empty as it is generated.

Here are the important dependencies for the fragment:

implementation "androidx.navigation:navigation-fragment:2.3.0"
implementation "androidx.navigation:navigation-ui:2.3.0"
implementation "androidx.navigation:navigation-fragment-ktx:2.3.0"
implementation "androidx.navigation:navigation-ui-ktx:2.3.0"
implementation "androidx.navigation:navigation-dynamic-features-fragment:2.3.0"
androidTestImplementation "androidx.navigation:navigation-testing:2.3.0"
implementation "androidx.fragment:fragment:1.2.5"
implementation "androidx.navigation:navigation-fragment-ktx:2.3.0"
implementation "androidx.navigation:navigation-ui-ktx:2.3.0"

When I do not include this line app:navGraph="@navigation/nav_graph" in my activity_login.xml -layout, I do not get an error. What's my mistake?

I am using Android Studio 4.1 Canary 10

Please just ask if I need to share more code or information... Thanks in advance and best regards!

And of course inside your "res" directory is a "navigation" directory? and it contains nav_graph.xml file, which when you double click loads correctly in the android IDE? — David Kroukamp, Jul 02 '20 at 20:34
Is your `nav_graph.xml` really just empty? That won't work at all - you'd need to actually add a destination to it before you can use it. Please include it and the error message you're getting. — ianhanniballake, Jul 02 '20 at 20:50
@DavidKroukamp , yes, there is this directory and it loads correctly on Ctrl+Left-Click — Malmatth, Jul 02 '20 at 21:01
@ianhanniballake , the "code" for this xml is just the standart code - no destination or anything. Do I need to implement that? I have no experience with thode NavGraphs, but when I firstly have to do that, I know where to start. — Malmatth, Jul 02 '20 at 21:03
The error message should specificially say you need a startDestination, so yes, you need to add one of those :) Sounds like going through the [Getting Started guide](https://developer.android.com/guide/navigation/navigation-getting-started) or the [Navigation codelab](https://codelabs.developers.google.com/codelabs/android-navigation) might be helpful. — ianhanniballake, Jul 02 '20 at 21:05
@ianhanniballake so stupid of me... I did just read the inflating error, after that there is _no start destination defined via app:startDestination for com.example.{APPNAME}:id/nav_graph_ Thanks a lot! You can answer the post with this solution if you wish, I will mark it as correct. — Malmatth, Jul 02 '20 at 21:11

score 7 · Answer 1 · answered Jan 07 '22 at 13:16

After updating to 'androidx.appcompat:appcompat:1.4.0' I received the same error.

What worked for me was to change:

in activity layout xml file from <fragment node to <androidx.fragment.app.FragmentContainerView

before

<fragment
    android:id="@+id/navHostFragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
...
    app:navGraph="@navigation/nav_graph"/>

after

<androidx.fragment.app.FragmentContainerView
    android:id="@+id/navHostFragment"
    android:name="androidx.navigation.fragment.NavHostFragment"
...
    app:navGraph="@navigation/nav_graph"/>

in activity Class file how the navController is initialized

before

        navController = findNavController(R.id.navHostFragment)

after

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

this works. what is weird is that this only caused my app to fail sometimes. — cagney, Apr 15 '22 at 15:43

score 2 · Accepted Answer · answered Jul 02 '20 at 21:12

2

Your navigation graph needs to have at least one destination - the start destination of your graph and the first screen users see when you inflate your graph as per the Getting Started guide.

answered Jul 02 '20 at 21:12

ianhanniballake

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score 0 · Answer 3 · answered Jul 02 '20 at 20:40

To navigation, you just need to implement two dependencies:

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

Please, share your nav_graph.xml

Error inflating class Fragment, when adding navGraph attribute

3 Answers3