Version 28 (intended for Android Pie and below) is the last version of the legacy support library, so we recommend that you migrate to AndroidX libraries when using Android Q and moving forward. The IDE can help with this: Refactor > Migrate to AndroidX 

 

 

今天整理代码的时候，发现我的app gradle 出现了上面那句话

简单的来讲是google不支持support库了，建议转换到androidX库

操作也很简单

 

 

选择 Migrate to AndroidX

 

然后选择文件

 

 就可以了