React-Native升级带来的问题

   React-Native升级到0.6版本，AndroidX is a major step forward in the Android ecosystem, and the old support library artifacts are being deprecated. For 0.60, React Native has been migrated over to AndroidX. This is a breaking change, and your native code and dependencies will need to be migrated as well.

   AndroidX是Android生态系统向前迈出的重要一步，旧的支持库工件已被弃用。对于0.60，React Native已迁移到AndroidX。这是一个重大变化，您的本机代码和依赖项也需要迁移。具体看https://facebook.github.io/react-native/blog/

因为版本升级，旧的项目运行之后会出现错误，所以需要迁移到AndroidX，具体看链接https://developer.android.com/jetpack/androidx/migrate#additional_resources，

主要就是：

1、借助 Android Studio 3.2 及更高版本，您可以通过从菜单栏中依次选择 Refactor > Migrate to AndroidX