Safeargs library doesnt generate direction class

Question

I use navigation library and safeargs for passing data. I define argument to fragment like that.

Answer 1

I followed all instructions to the letter and noticed the Directions classes were being generated, but would not compile when called in code. This happened while using Android Studio 4.1 and 4.2 Preview.

After a few hours, I decided to try downgrading to 4.0 Stable. All issues are now gone, I can call the FragmentDirections and it compiles.

I added a bug in the issue tracker: https://issuetracker.google.com/issues/158777967

Answer 2

If you already added the dependencies > classpath and apply plugin but changes aren't applied, be sure to Clean and Built the project in order changes are applied.

In Android Studio:

• Build tab > Clean project
• Build tab > ReBuild project

Answer 3

In my case I manually added the arguments... in the wrong place

Answer 4

We can fix this issue by adding the below codes in gradle and rebuilding the app. In the project gradle add below code.

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

In app gradle add below code

apply plugin: "androidx.navigation.safeargs"

Answer 5

In my case, the missing part was firstly in the build.gradle.kts

buildscript {
repositories {
    google()
}
dependencies {
    def nav_version = "X.X.X" // Use the latest version
    classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
}

}

and then, I had to add the plugin in app and navigation modules (I usually separate navigation in a different one):

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

Clean -> Build But still had to add manually the path to the action

import yourpackage.FragmentDirections.Companion.actionFirstFragmentToSecondFragment

Answer 6

Follow these steps:

Step 1: Add dependencies

def nav_version = "2.3.2"

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

Step 2: In your app-level build.gradle make sure you have below plugins added.

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
    id 'kotlin-android-extensions'
    id 'androidx.navigation.safeargs.kotlin'
}

Step 3: Add this in project_level build.gradle inside dependencies section :

classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.3.2"

Step 4: In your nav_graph.xml make sure to connect one fragment to another with actions.

Step 5: Clean & Rebuild your project.