android - 无法解析所有androidx依赖项

Question

我从下面的链接下载了“BasicSample”项目并添加到Android Studio，但是当我同步该项目时，显示有关无法解决所有“androidx”依赖项的错误。

https://github.com/googlesamples/android-architecture-components/tree/master/BasicSample

我搜索并尝试了一些操作，例如删除.idea文件夹或使缓存无效，然后重新启动，然后将'android.useAndroidX = true'和'android.enableJetifier = true'添加到'gradle.properties'中，但没有用，并且出现相同的错误。

错误如下:

Failed to resolve: androidx.databinding:databinding-runtime:3.2.1

Failed to resolve: androidx.databinding:databinding-adapters:3.2.1

Failed to resolve: androidx.appcompat:appcompat:1.0.0

Failed to resolve: androidx.legacy:legacy-support-v4:1.0.0

Failed to resolve: com.google.android.material:material:1.0.0
Install Repository and sync project

Failed to resolve: androidx.cardview:cardview:1.0.0

Failed to resolve: androidx.lifecycle:lifecycle-runtime:2.0.0

Failed to resolve: androidx.lifecycle:lifecycle-extensions:2.0.0

Failed to resolve: androidx.room:room-runtime:2.1.0-alpha06

Failed to resolve: androidx.test:runner:1.1.1

Failed to resolve: androidx.test:rules:1.1.1

Failed to resolve: androidx.room:room-testing:2.1.0-alpha06

Failed to resolve: androidx.arch.core:core-testing:2.0.1

Failed to resolve: androidx.test.espresso:espresso-core:3.1.1

Failed to resolve: androidx.test.espresso:espresso-contrib:3.1.1

Failed to resolve: androidx.test.espresso:espresso-intents:3.1.1

Failed to resolve: androidx.annotation:annotation:1.0.0

如何解决这些错误？

Answer 1

你看过https://developer.android.com/jetpack/androidx/releases/room

而且当您在下面传递导入时(没有androidx)

implementation "android.arch.lifecycle:runtime:1.0.0-rc1"
implementation 'android.arch.lifecycle:extensions:1.1.1'
annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'

您将能够导入
以及其他 androidx.*导入。试试看，并反馈!

但是对于 import androidx.lifecycle.ViewModelProviders这样的导入，您必须通过 implementation group: 'androidx.lifecycle', name: 'lifecycle-extensions', version: '2.0.0-rc01'