android studio在创建项目的时候，有个选项：Use legacy android.support libraries
这个选项就是使用v7包，如果不选择的话应该是androidx。
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Android:你好,androidX！再见,android.support
Version 28 (intended for Android Pie and below) is the last version of the legacy support library.....Refactor > Migrate to AndroidX
Suggestion: use tools:overrideLibrary="android.support.v17.leanback" to force usage
关于android support 升级为androidx
Android Design Support Library
Support for the experimental syntax 'decorators-legacy' isn't currently enab -- 装饰器@
解决react项目：Support for the experimental syntax 'decorators-legacy' isn't currently enabled
*** WARNING - this build will not support IPVS with IPv6. Please install libnl/libnl-3 dev libraries to support IPv6 with IPVS.
Android Support Library详细介绍
Android Support 包的作用、用法