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Flutter初体验（一）——Mac 安装配置
如果你在国内使用 Flutter，那么你可能需要找一个与官方同步的可信的镜像站点，帮助你的 Flutter 命令行工具到该镜像站点下载其所需的资源。
你需要为此设置两个环境变量：“PUB_HOSTED_URL”和“FLUTTER_STORAGE_BASE_URL”，然后再运行 Flutter 命令行工具，查看设置教程。
上海交通大学 Linux 用户组
FLUTTER_STORAGE_BASE_URL: https://mirrors.sjtug.sjtu.edu.cn
PUB_HOSTED_URL: https://dart-pub.mirrors.sjtug.sjtu.edu.cn
Flutter 社区
FLUTTER_STORAGE_BASE_URL: https://storage.flutter-io.cn
PUB_HOSTED_URL: https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
注意：我们无法保证这些镜像网站得以长期维护和运行，请慎重选择一些可信的镜像网站。
下载flutter stable：https://flutter.dev/docs/get-started/install/macos
- 配置永久环境变量：
1、将下载的flutter包放在/Users/yuanzhiying/Library/下
2、执行命令：
open ~/.bash_profile
如果不存在.bash_profile，则执行cd ~和touch .bash_profile来创建一个.bash_profile
3、打开文件，在里面添加上：
# flutter
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
export PATH=${PATH}:/Users/yuanzhiying/Library/flutter/bin
4、执行
source ~/.bash_profile
5、验证
echo $PATH
6、执行flutter doctor，返回结果
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14.2 18C54, locale
zh-Hans-CN)
[✗] Android toolchain - develop for Android devices
✗ Unable to locate Android SDK.
Install Android Studio from:
https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK
components.
(or visit https://flutter.io/setup/#android-setup for detailed
instructions).
If Android SDK has been installed to a custom location, set $ANDROID_HOME
to that location.
You may also want to add it to your PATH environment variable.
[!] iOS toolchain - develop for iOS devices (Xcode 10.1)
✗ libimobiledevice and ideviceinstaller are not installed. To install with
Brew, run:
brew update
brew install --HEAD usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller
✗ ios-deploy not installed. To install with Brew:
brew install ios-deploy
[!] Android Studio (not installed)
[✓] Connected device (1 available)
! Doctor found issues in 3 categories.
按照上面的提示安装不合要求的项目。
7、 iOS toolchain按照命令即可安装成功。
8、安装android-studio
下载android-studio：
https://developer.android.com/studio/index.html (最新版)
dmg包双击安装即可
9、打开android studio，按提示安装Android sdk
10、安装Android studio plugin：Flutter dart
搜索不到无法下载，按下面的处理方法：
File->Settings->Apparence & Behavior->System Settings->Updates->use secure connnection 勾去掉
11、Android Studio、IntelliJ IDEA安装Flutter plugin和Dart plugin
先去掉Android studio中updates的Use secure connection的勾选，点击应用apply。
plugins中搜索库flutter：
其他问题解决办法：
一、Android license status unknown
[!] Android toolchain - develop for Android devices (Android SDK 28.0.3)
✗ Android license status unknown.
执行：
flutter doctor --android-licenses
结果：
yuanzhiying:~ yuanzhiying$ flutter doctor --android-licenses
Warning: File /Users/yuanzhiying/.android/repositories.cfg could not be loaded.
All SDK package licenses accepted.======] 100% Computing updates...
yuanzhiying:~ yuanzhiying$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14.2 18C54, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[✓] Android Studio (version 3.3)
[✓] IntelliJ IDEA Ultimate Edition (version 2018.1.4)
[✓] Connected device (2 available)
• No issues found!
