A problem occurred evaluating root project 'android'.
> A problem occurred configuring project ':app'.
> A problem occurred configuring project ':app'.
> The SDK directory '/Users/qq1440214507/Downloads/Sdk' does not exist.
错误如上，大概是我创建了flutter项目之后又移动了android sdk的项目，虽然环境变量以及android studio的
相应配置也指向了正确的sdk目录，但是flutter项目本身还需要配置一下。您的项目地址/android/local.properties，
第一行配置正确的sdk地址
sdk.dir=/Users/qq1440214507/Sdk flutter.sdk=/Users/qq1440214507/flutter/flutter flutter.buildMode=debug