Flutter环境安装-绕过各种坑
1.安装AndroidStudio
2.下载Dart插件
3.安装Flutter插件
4.新建flutter工程
5.未安装FlutterSDK，选择安装
6.安装完配置Flutter环境变量
Mac版在 .bash_profile 文件中直接贴上如下配置：
export PATH=${PATH}:/Users/xxx/Flutter文件夹/flutter/bin
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn