Android studio报错Failed to resolve: com.android.support:appcompat-v7:29.+ Install Repository and sync

Android studio报错Failed to resolve: com.android.support:appcompat-v7:29.+ Install Repository and sync project Show in File Show in Project Structure dialog

解决方法：
1.点击 AVD Manager

2.选中Updates,查看Android SDK Tools版本
Android studio报错Failed to resolve: com.android.support:appcompat-v7:29.+ Install Repository and sync

3.双击第二个build.gradle，修改图中圈中的数据为Android SDK Tools版本25.2.5的整数 25
Android studio报错Failed to resolve: com.android.support:appcompat-v7:29.+ Install Repository and sync

4.修改图中圈中的数据为Android SDK Tools版本25.2.5

解决
Android studio报错Failed to resolve: com.android.support:appcompat-v7:29.+ Install Repository and sync

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