一、Flutter 环境
1.open ~/.bash_profile
```
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
export PATH=/Users/xxx/Documents/flutter/bin:$PATH
```
2.source ~/.bash_profile
3.flutter doctor
==========
4.关掉终端 在输入flutter doctor
2.AndroidStudio 配置
1.安装Flutter好像会自动安装Dart
a.Preferences ——> Plugins ——> Flutter
b.Preferences ——> Plugins ——>Dart
3.新建Flutter Project
File——>New Flutter Project
4.升级Dart
//1.下载dart-lang 自动更新
brew tap dart-lang/dart
//2.安装dart-lang
brew install dart
// Error: dart-lang/dart/dart not installed
//手动更新
//3.寻找mac 的 brew caches
brew --cache
/Users/XXX/Library/Caches/Homebrew
//4.拷贝
cp /Users/XXX/Downloads/dartsdk-macos-x64-release.zip /Users/XXX/Library/Caches/Homebrew
//5.安装
brew install dart
5.升级Flutter
去到flutter目录下 更新flutter
flutter upgrade // 解决版本问题 requires SDK version >=2.10.0 <3.0.0, version solving failed.
