• 打开项目找不到Dart SDK
  打开当前项目，菜单Android Studio - Preferences - Languages and Frameworks - Dart，勾选Enable Dart support for the project 'demo'
  填写如下：
  /Users/yuanzhiying/Library/flutter/bin/cache/dart-sdk
  Apply即可。
  

  

• 打开项目packages都找不到
  命令行进入项目根目录，运行：flutter packages get