'Unresolved reference: NavArgs after added some arguments to destination

I'm working on a small project and trying to use the new navigation architecture components. When i'm trying to add some arguments to a destination i got "Unresolved reference: NavArgs" error.

I followed this guide https://developer.android.com/topic/libraries/architecture/navigation/navigation-pass-data#kotlin and already added

classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-alpha11"

to my project gradle file and also added

apply plugin: 'androidx.navigation.safeargs.kotlin'

to my app gradle file.

As seen in the guide above i want to use val args: AddKittenFragmentArgs by navArgs() to get the passed arguments. But navArgs() isn't recognized.

Also NavArgs in the generated code isn't resolved.

data class MyFragmentArgs(val argOne: String? = "\"\"", val argTwo: String? = "\"\"") : NavArgs

Solution 1:^[1]

As per the documentation on that very page:

When using the -ktx dependencies, Kotlin users can also use the by navArgs() property delegate to access arguments.

Make sure you are following the Adding Components documentation and using the navigation-fragment-ktx dependency:

implementation "android.arch.navigation:navigation-fragment-ktx:1.0.0-alpha11"

Solution 2:^[2]

In my case i typed the argument Name starting by a capital letter

        <argument
            android:name="MyArgument" // changed it to myArgument fix the problem
            app:argType="string"
            app:nullable="false" />

Solution 3:^[3]

I had the same problem until I realized the navigation component's project dependencies were using a different version than the one specified by the plugin (in the classpath).

i.e. In the project's build.gradle

classpath 'android.arch.navigation:navigation-safe-args-gradle-plugin:1.0.0-beta01'

in the app build.gradle

// Navigation
implementation 'android.arch.navigation:navigation-fragment-ktx:'+ rootProject.navigationVersion
implementation 'android.arch.navigation:navigation-ui-ktx:' + rootProject.navigationVersion

where navigationVersion was

ext {
   ...
   navigationVersion = "1.0.0-alpha08"
}

lint doesn't tell you there's an update to a library when the dependency is interpolated.

Solution 4:^[4]

i had the same problem and i solved this by doing following steps

Build -> Clean Project
delete argument from nav_graph.xml file
create new argument
Build -> Rebuild Project
set the argument

val action: NavDirections = AreThereAnyDecayedTeethInTheAreaOfPainFragmentDirections
                .actionAreThereAnyDecayedTeethInTheAreaOfPainFragmentToResultFragment(
                    finalresult = "somethings"
                )

use this argument on FragmentDest

        arguments.let {
            binding.board.text = ResultFragmentArgs.fromBundle(it!!).finalresult
        }

Solution 5:^[5]

I solved this by doing Clean Project from Build menu of Android Studio.

Go to Menu : Build >> Clean Project

Solution 6:^[6]

just fyi if you want to pass String your argType should be string instead of String.

 app:argType="string"

Solution 7:^[7]

In my case I need to added this it in my build.gradle (app)

kotlinOptions {
    jvmTarget = '1.8'
}

Solution 8:^[8]

Latest release version 1.0.0 seems to have fixed this issue. Just change the navigation dependency version to 1.0.0 along with adding the -ktx dependencies as mentioned in other answers and everything should work.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	ianhanniballake
Solution 2	Hussien Fahmy
Solution 3	wooldridgetm
Solution 4	alirezaarzehgar
Solution 5	Yogesh Umesh Vaity
Solution 6	Ege Kuzubasioglu
Solution 7	Álysson Alexandre
Solution 8	Ezio

'Unresolved reference: NavArgs after added some arguments to destination

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]

Solution 6:[6]

Solution 7:[7]

Solution 8:[8]