重复构建失败“要使用协程功能,您必须添加`ktx`.......”

Dav*_*nUk 8 android coroutine kotlin android-room

我是 Kotlin 和 Android Studio 的新手,我目前的问题是......
我正在尝试让 Codelabs“android-room-with-a-view-kotlin”工作,同时修复各种构建错误,我认为我的 build.gradle 变得非常混乱!我通过添加依赖项更正了Word.kt 上的最后一次构建失败

kapt 'androidx.room:room-ktx:2.2.1'
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下一个构建在WordDao.kt更进一步,但由于相同类型的错误而失败。

WordDao.java:21: error: To use Coroutine features, you must add `ktx` artifact from Room as a dependency. androidx.room:room-ktx:<version>
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我无法继续,因为我不知道要在 build.gradle 中更改什么,因为我已经添加了该依赖项?

正如我已经说过我的文件现在很迷茫,我将不胜感激任何以使其更明智的援助。谢谢, DaveInUk

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: "kotlin-kapt"

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.prepopplus"
        //was minSdkVersion 15  Note Old phone is API16
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }

        packagingOptions {
            exclude "META-INF/atomicfu.kotlin_module"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50"

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    kapt 'androidx.room:room-ktx:2.2.1'
    kapt "androidx.room:room-compiler:2.2.1"
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0-rc01'

    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
    kapt "android.arch.persistence.room:compiler:1.1.1"
    kapt "android.arch.lifecycle:compiler:1.1.1"

    implementation 'androidx.room:room-runtime:2.2.1'
}
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ian*_*ake 42

你正在使用

kapt 'androidx.room:room-ktx:2.2.1'
kapt "androidx.room:room-compiler:2.2.1"
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androidx.room:room-ktx不是 的输入kapt,而是正常的implementation依赖项(room-compiler注解处理器)。因此,您的依赖项需要是

implementation 'androidx.room:room-ktx:2.2.1'
kapt "androidx.room:room-compiler:2.2.1"
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根据声明室依赖项文档。请注意,room-ktx在拉room-runtime的传递依赖,这样你就可以删除依赖和仅仅依靠room-ktx如果你想。


小智 15

这些是您应该添加的。

implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version"
// Kotlin Extensions and Coroutines support for Room
implementation "androidx.room:room-ktx:$room_version" 
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  • 官方文档中有些缺失。https://developer.android.com/jetpack/androidx/releases/room (2认同)