现象：flutter SDK升级后Mac 下 flutter doctor 不同

Android Studio (version 4.1)

          • Android Studio at /Applications/Android Studio.app/Contents

          ✗ Flutter plugin not installed; this adds Flutter specific

      functionality.

          ✗ Dart plugin not installed; this adds Dart specific functionality.

          • Java version OpenJDK Runtime Environment (build

      1.8.0_242-release-1644-b3-6222593)

解决：mac os解决办法 

ln -s ~/Library/Application\ Support/Google/AndroidStudio4.1/plugins ~/Library/Application\ Support/AndroidStudio4.1