Navigation component - No Directions class generated

Question

I have a fragment A where an action is originated to fragment B which have to receive an argument. When I try to set the argument before navigate, 'FragmentADirections' class can't be resolve. The fact is, I have a fragment C going to D with an argument to and this work well for these two.

Fragment A class ('EntrainementAction'):

    package com.example.androidsportsomveille.Fragments;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.navigation.Navigation;

import com.example.androidsportsomveille.Classes.Entrainement;
import com.example.androidsportsomveille.R;

public class EntrainementAction extends Fragment {

    private Entrainement entrainement;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_entrainement_action, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        this.entrainement = EntrainementActionArgs.fromBundle(getArguments()).getMyEntrainement();

        // Remplis le layout avec les données de l'enrainement
        populateLayout();

        // Aller à la gestion de l'entrainement
        Button btnGestion = view.findViewById(R.id.btnGestionEntrainement);
        btnGestion.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Set de l'argument puis navigation
                EntrainementActionDirections.ActionEntrainementActionToEntrainementGestion action =
                        EntrainementActionDirections.actionEntrainementActionToEntrainementGestion(entrainement);
                Navigation.findNavController(view).navigate(action);
            }
        });
    }

    public void populateLayout() {
        TextView txtNom = getView().findViewById(R.id.txtNomEntrainement);
        txtNom.setText(this.entrainement.getNom());
    }
}

Error appear in 'btnGestion.setOnClickListener' where 'EntrainementActionDirections' cannot be resolve. Note that I have other Directions class well generated.

My nav_graph.xml file:

<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="@+id/nav_graph"
    app:startDestination="@id/entrainementListe">

    <fragment
        android:id="@+id/entrainementListe"
        android:name="com.example.androidsportsomveille.Fragments.EntrainementListe"
        android:label="fragment_entrainement_liste"
        tools:layout="@layout/fragment_entrainement_liste" >
        <action
            android:id="@+id/action_entrainementListe_to_entrainementNouveau"
            app:destination="@id/entrainementNouveau" />
        <action
            android:id="@+id/action_entrainementListe_to_entrainementAction"
            app:destination="@id/entrainementAction" />
    </fragment>

    <fragment
        android:id="@+id/entrainementNouveau"
        android:name="com.example.androidsportsomveille.Fragments.EntrainementNouveau"
        android:label="fragment_entrainement_nouveau"
        tools:layout="@layout/fragment_entrainement_nouveau" >
        <action
            android:id="@+id/action_entrainementNouveau_to_entrainementGestion"
            app:destination="@id/entrainementGestion" />
    </fragment>
    <fragment
        android:id="@+id/entrainementAction"
        android:name="com.example.androidsportsomveille.Fragments.EntrainementAction"
        android:label="fragment_entrainement_action"
        tools:layout="@layout/fragment_entrainement_action" >
        <argument
            android:name="myEntrainement"
            app:argType="com.example.androidsportsomveille.Classes.Entrainement" />
        <action
            android:id="@+id/action_entrainementAction_to_entrainementGestion"
            app:destination="@id/entrainementGestion" />
    </fragment>
    <fragment
        android:id="@+id/entrainementGestion"
        android:name="com.example.androidsportsomveille.Fragments.EntrainementGestion"
        android:label="fragment_entrainement_gestion"
        tools:layout="@layout/fragment_entrainement_gestion" >
        <action
            android:id="@+id/action_entrainementGestion_to_entrainementAction"
            app:destination="@id/entrainementAction" />
        <argument
            android:name="myEntrainement"
            app:argType="com.example.androidsportsomveille.Classes.Entrainement" />
    </fragment>
</navigation>

Fragments 'entrainementAction' and 'entrainementGestion' haven't Directions class generated while 'entrainementListe' and 'entrainementNouveau' have. All fragment's xml files exists.

Answer 1

仔细检查以将其添加到您的应用程序 Gradle 中（顶部）

plugins {
    id "androidx.navigation.safeargs.kotlin"
}

Answer 2

来自： https: //developer.android.com/guide/navigation/navigation-getting-started

在目的地之间导航的推荐方法是使用 Safe Args Gradle 插件。该插件生成简单的对象和构建器类，支持类型安全的导航和目的地之间的参数传递。

要将 Safe Args 添加到您的项目，请在顶级 build.gradle 文件中包含以下类路径：

buildscript {
repositories {
    google()
}
dependencies {
    def nav_version = "2.3.5"
    classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
}

}

要生成适合 Java 或混合 Java 和 Kotlin 模块的 Java 语言代码，请将此行添加到应用程序或模块的 build.gradle 文件中：

apply plugin: "androidx.navigation.safeargs"

根据迁移到 AndroidX，您的 gradle.properties 文件中必须有 android.useAndroidX=true。

启用 Safe Args 后，插件会生成包含您定义的每个操作的类和方法的代码。

Answer 3

午休后，我启动了 android studio，然后生成了我的 Directions 类。我不知道为什么我不能早点使用它们。