1、下载Fullter SDK

     官方地址: https://flutter.cn/docs/get-started/install/macos#update-your-path

2、解压

     cd /Users/reead/Downloads/Flutter

     unzip /Users/reead/Downloads/Flutter/flutter_macos_v1.9.1+hotfix.5-stable.zip 

3、配置环境变量

打开当前目录下的.bash_profile文件

     vi ~/.bash_profile

复制一下代码并保存

     export PUB_HOSTED_URL=https://pub.flutter-io.cn

     export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn

     export PATH=${PATH}:${PWD}/flutter/bin

增加一行

      export PATH=/你的flutter文件夹所在位置/flutter/bin:$PATH

保存全局变量文件

      source ~/.bash_profile

可以运行flutter命令

      flutter -h

4、检查依赖

    flutter doctor -v

根据提示依次执行 ：

flutter doctor --android-licenses 

过程中一直Y到底。

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

sudo gem install cocoapods

在sudo gem install cocoapods的时候，会提示

Fetching: httpclient-2.8.3.gem (100%)

ERROR:  While executing gem ... (Gem::FilePermissionError)

You don't have write permissions for the /usr/bin directory.

用sudo gem install -n /usr/local/bin cocoapods替换上面的命令继续执行就可以了。

[✓] Android Studio (version 3.5)

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

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

这个只需要打开Android Studio->preferences->Plugins中，搜索Flutter install后，重启Android studio.

再次运行

flutter doctor

即可！