Class 'action' 不是抽象的，没有实现抽象成员 public abstract val actionId: Int defined in androidx.navigation.NavDirections

Question

我用的是版本2.4.0-alpha04，方便使用navigation的multi-backstack。 (develop docs)

但是我得到以下错误：

Class 'ActionDialogToWriteRoutine' is not abstract and does not implement abstract member public abstract val actionId: Int defined in androidx.navigation.NavDirections

我首先在这里搜索修复错误，发现同样错误的问题。 ()

我在 link 中看到一个答案，说从 v2.4.0-alpha02 开始的错误已修复。

但我仍然得到同样的错误。

所以我根据自己的情况重新发帖

发生了什么事？

build.gradle[app]

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'

    // safe args
    id 'androidx.navigation.safeargs.kotlin'
}

dependencies {
    def lifecycle_version = "2.3.1"
    def nav_version = "2.4.0-alpha04"

    // AAC
    implementation("androidx.fragment:fragment-ktx:1.3.4")

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

}

nav_graph.xml

<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/calendar">

    <include app:graph="@navigation/calendar"/>
    <include app:graph="@navigation/list"/>
    <include app:graph="@navigation/write_home"/>
</navigation>

write_home.xml

<?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/write"
    app:startDestination="@id/home">

    <fragment
        android:id="@+id/home"
        android:name="com.example.writeweight.fragment.WriteRoutineHomeFragment"
        android:label="fragment_write_routine_home"
        tools:layout="@layout/fragment_write_routine_home" >
        <action
            android:id="@+id/action_home_to_dialog"
            app:destination="@id/dialog" />
    </fragment>
    <fragment
        android:id="@+id/dialog"
        android:name="com.example.writeweight.fragment.BodyPartDialogFragment"
        android:label="BodyPartDialogFragment"
        tools:layout="@layout/fragment_body_part_dialog">
        <action
            android:id="@+id/action_dialog_to_write_routine"
            app:destination="@id/write_routine" />
    </fragment>
    <fragment
        android:id="@+id/write_routine"
        android:name="com.example.writeweight.fragment.WriteRoutineFragment"
        android:label="WriteRoutineFragment"
        tools:layout="@layout/fragment_writing_routine">
        <argument
            android:name="title"
            app:argType="string"
            app:nullable="true"
            android:defaultValue="@null"/>
        <argument
            android:name="workout"
            app:argType="string"
            app:nullable="true"
            android:defaultValue="@null"/>
        <action
            android:id="@+id/action_write_routine_to_workout_tab"
            app:destination="@id/workout_tab" />
    </fragment>
    <fragment
        android:id="@+id/workout_tab"
        android:name="com.example.writeweight.fragment.WorkoutListTabFragment"
        android:label="WorkoutListTabFragment"
        tools:layout="@layout/fragment_workout_list_tab">
        <action
            android:id="@+id/action_workout_tab_to_write_routine"
            app:destination="@id/write_routine" />
    </fragment>
</navigation>

Answer 1

在您的应用级别 build.gradle 文件替换

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

和

plugins {
    id 'androidx.navigation.safeargs'
}

Answer 2

在您的 build.gradle 文件（模块）中。

改变

plugin{
....
id 'androidx.navigation.safeargs.kotlin'

}

到

plugin{
.....
id 'androidx.navigation.safeargs'

}

Class 'action' 不是抽象的，没有实现抽象成员 public abstract val actionId: Int defined in androidx.navigation.NavDirections

Class 'action' is not abstract and does not implement abstract member public abstract val actionId: Int defined in androidx.navigation.NavDirections

android

kotlin

android-navigation