我正在尝试使用AWS的登录功能 - Amazon Cognito用于我的Android App . 我指的是文档 - https://docs.aws.amazon.com/aws-mobile/latest/developerguide/mobile-hub-add-aws-mobile-user-sign-in.html

我根据以下代码片段的文档添加了3组依赖项

// Mobile Client for initializing the SDK  
    implementation 'com.amazonaws:aws-android-sdk-mobile-client:2.8.5'  { transitive = true }  
// Cognito UserPools for SignIn  
    implementation 'com.android.support:support-v4:28.0.0'
    implementation 'com.amazonaws:aws-android-sdk-auth-userpools:2.8.5' { transitive = true }  
// Sign in UI Library  
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.amazonaws:aws-android-sdk-auth-ui:2.8.5'  { transitive = true }

但我的gradle同步失败，出现以下错误：

Could not find method com.amazonaws:aws-android-sdk-mobile-client:2.8.5() for arguments [build_6vy0z59k6cznmh7b4jt6hu05j$_run_closure2$_closure6@46f6d617] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

我猜android-sdk-mobile-client依赖有问题，但我不确定是什么问题

android amazon-web-services