一、如下提示

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... less... (Ctrl+F1) 
Inspection info:There are some combinations of libraries, or tools and libraries,that are incompatible, or can lead to bugs. One such incompatibility is compilingwith a version of the Android support libraries that is not the latest version 
(or in particular, a version lower than your targetSdkVersion).  
Issue id: GradleCompatible

二、报错原因：

      1、由于Android Studio 版本较高，添加库依赖已经不支持compile语句，应使用implementation或者api.

      2、若使用api或implementation语句仍然报错，可能是库的版本较低，出现了不兼容的现象。

      3、由于原来的support 库太乱了，谷歌在新版本中取消了support库，使用了新的andriodX库。

三、为了解决上述问题，我们需要将原理的support库迁移到AndroidX并使用implementation添加依赖。

 

 

 四、类映射，下表列出了从旧支持库软件包到新 androidx 软件包的当前映射关系。您也可以下载包含这些映射信息的 CSV 格式文件。 

       详细的类映射https://developer.android.google.cn/jetpack/androidx/migrate/class-mappings#androidsupportv7

 

五、参考文章

       1、https://www.freesion.com/article/2023437918/

       2、https://stackoverflow.com/questions/57546020/package-android-support-v7-app-does-not-exist-error-in-androidstudio