1. File > Project Structure (Command + ???? > Under Project Settings/Project > Set Project SDK to Android API 29 Platform(File>Project Structure（Command +;）>在项目设置/项目下>将Project SDK设置为Android API 29 Platform)
3.Update GradleException() to FileNotFoundException() under android/app/build_gradle since it's not supported in the Java version of Android API 29That's it! You should notice the Android API 29 Platform is now visible under External Libraries.(将GradleException（）更新为android / app / build_gradle下的FileNotFoundException（），因为Java版本的Java API不支持29而已！您应该注意到，Android API 29平台现在在“外部库”下可见。)