Androidx迁移后未解决的参考R.

Question

在Gradle脚本中更新build.gradle(Module:app)中的依赖项之后,我的所有布局,字符串,R定义的所有引用都不可用.我在Module app中有以下代码:

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex')) {
                details.useVersion "28.0.0"
            }

            if(details.requested.group == 'androidx.lifecycle'  && !details.requested.name.contains('multidex'))
            {
                details.useVersion "2.0.0"
            }

        }
    }
}

dependencies 
{


 implementation 'androidx.test:runner:1.1.0'
    implementation 'androidx.test.espresso:espresso-core:3.1.0'
        //    androidTestImplementation 'com.android.support.test:runner:1.0.2'
        //    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    // lifecycle components
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
    implementation 'androidx.lifecycle:lifecycle-viewmodel:2.0.0'
    implementation 'androidx.lifecycle:lifecycle-livedata-core:2.0.0'
    kapt 'androidx.lifecycle:lifecycle-compiler:2.0.0'

    //    implementation 'android.arch.lifecycle:extensions:1.1.1'
    //    kapt "android.arch.lifecycle:compiler:1.1.1"

    // room components
        //    implementation 'android.arch.persistence.room:runtime:1.1.1'
    implementation 'androidx.room:room-runtime:2.0.0'

    //    data binding components
    annotationProcessor "com.android.databinding:compiler:3.1.4"
    implementation 'io.reactivex.rxjava2:rxjava:2.2.2'
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'
    implementation 'com.github.bumptech.glide:glide:4.8.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'

    //implementation 'com.google.dagger:dagger-android:2.16'
    implementation 'com.google.dagger:dagger-android-support:2.16'
    // if you use the support libraries
    annotationProcessor 'com.google.dagger:dagger-android-processor:2.15'
    compile project(path: ':data')
}

在搜索项目时,通过项目资源管理器,项目似乎不再具有R文件.

Answer 1

迁移到androidx后我遇到了这样的问题.经过一番努力,我发现问题是关于我使用最新的Gradle插件(如下所示),而我的Android Studio版本不是最新的(它是3.2).

com.android.tools.build:gradle:3.3.0

当我将gradle插件更改为较低版本(如下所示)时,一切正常.

com.android.tools.build:gradle:3.2.1

方案:

因此,解决方案是使用与您的Android Studio版本匹配的Gradle插件(和Gradle包装器)版本.