1.安装VSCode
2.下载Flutter
下载完成之后,需要建立一个文件夹存放Flutter,这个文件夹位置随意,最好放到方便自己管理的地方，比如我在桌面建立一个 Flutter 文件夹，将下载并且解压了的文件或者克隆的文件直接放入 Flutter 文件夹里面，因为我是在桌面创建的文件夹，那么地址也就是
/Users/xxx/Desktop/Flutter/flutte
bin文件路径
/Users/xxx/Desktop/Flutter/flutter/bin
效果图
Github下载 错误注意: 如果使用 ,我第一次使用的是直接下载ZIP包，但是却在 【3.配置Flutter】 路径之后报错如下
MacBook-Pro:~ MacBook-Pro$ flutter -h Error: The Flutter directory is not a clone of the GitHub project. The flutter tool requires Git in order to operate properly; to set up Flutter, run the following command: git clone -b stable https://github.com/flutter/flutter.git 错误告诉我们: flutter目录不是github项目的克隆 需要用到git 无法正常运行，要求我们使用克隆下载
那么我们就使用克隆下载Flutter, 下面链接中的 stable 是分支名,可以根据自己需求修改，
stable 分支是Flutter稳定分支，你可以跟踪master分支，但注意这是开发分支，所以稳定性要低得多，可以参考官方解释
$ git clone -b stable https://github.com/flutter/flutter.git
克隆下来的项目文件也还是放到 Flutter 文件夹中，这样下载就完成了。
3.配置Flutter
上面已经下载好Flutter, 也存放到文件夹, 那么我们来配置一下。
1.打开终端工具，输入命令:
$ vim ~/.bash_profile
2.加入下面代码到文件里
第3行路径是你在 Flutter 里面 bin文件路径, 也就上面下载里面贴出来的bin文件路径
这行可以根据你存放的路径更换，总之指定为bin路径就行。 第1，2行则是官方文件中说的镜像问题，所以我们直接添加进来。
export PUB_HOSTED_URL=https://pub.flutter-io.cn export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn export PATH=/Users/xxx/Desktop/Flutter/flutter/bin:$PATH
添加好之后 :wq 保存。
配置完成后，需要用source命令重新加载一下
$ source ~/.bash_profile
4.检查Flutter
检查是否安装了 Flutter
方法一
$ flutter -h
如果没有安装就会出现【方法二】中的下载进度页面, 如果安装了则会出现
MacBook-Pro:~ MacBook-Pro$ flutter -h Manage your Flutter app development. Common commands: flutter create <output directory> Create a new Flutter project in the specified directory. flutter run [options] Run your Flutter application on an attached device or in an emulator. Usage: flutter <command> [arguments] Global options: -h, --help Print this usage information. ......
如果安装成功之后, 还是需要使用 【方法二】 中的 $ flutter doctor 命令，检查开发环境。
方法二（推荐使用该方式）
$ flutter doctor
如果出现下面这样的页面,表示你Flutter还没下载,正在下载Flutter,文章上面的下载可以理解为是安装工具,现在才是正式安装:
MacBook-Pro:~ MacBook-Pro$ flutter doctor Downloading Dart SDK from Flutter engine 52c7a1e849a170be4b2b2fe34142ca2c0a6fea1f... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 120M 100 120M 0 0 9310k 0 0:00:13 0:00:13 --:--:-- 10.3M
下载完成之后，就会开始安装:
MacBook-Pro:~ MacBook-Pro$ flutter doctor Downloading Dart SDK from Flutter engine 52c7a1e849a170be4b2b2fe34142ca2c0a6fea1f... % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 120M 100 120M 0 0 9310k 0 0:00:13 0:00:13 --:--:-- 10.3M Building flutter tool... ╔════════════════════════════════════════════════════════════════════════════╗ ║ Welcome to Flutter! - https://flutter.dev ║ ║ ║ ║ The Flutter tool anonymously reports feature usage statistics and crash ║ ║ reports to Google in order to help Google contribute improvements to ║ ║ Flutter over time. ║ ║ ║ ║ Read about data we send with crash reports: ║ ║ https://github.com/flutter/flutter/wiki/Flutter-CLI-crash-reporting ║ ║ ║ ║ See Google's privacy policy: ║ ║ https://www.google.com/intl/en/policies/privacy/ ║ ║ ║ ║ Use "flutter config --no-analytics" to disable analytics and crash ║ ║ reporting. ║ ╚════════════════════════════════════════════════════════════════════════════╝ Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source! Downloading Material fonts... 1.1s Downloading android-arm-profile/darwin-x64 tools... 0.7s Downloading xxx ......
安装完成之后,就会继续执行上面因为下载中断的 $ flutter doctor 命令, 打印检查结果:
MacBook-Pro:~ MacBook-Pro$ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, v1.5.4-hotfix.2, on Mac OS X 10.14.4 18E227, 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.dev/setup/#android-setup for detailed instructions). If the 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: brew install ios-deploy ✗ Brew can be used to install tools for iOS device development. Download brew at https://brew.sh/. [!] Android Studio (not installed) [!] VS Code (version 1.34.0) ✗ Flutter extension not installed; install from https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter [!] Connected device ! No devices available ! Doctor found issues in 5 categories.
你应该可以读出上面的检测结果(或者找翻译)，有很多条目都没有通过。需要我们安装检测结果一条条进行安装，直到满足开发环境。（如果有[!]x标志，表示本行检测没有通过，就需要我们设置或者安装相应的软件了。）
有可能你的Android studio也没有安装，那么你要先安装这个编辑器，
安装好后，可以顺便下载Android SDK。打开 Android studio 就会自己弹出来安装 Android SDK，你只需要保证网络能下载就行了。另外MAC自带 java jdk,所以也不需要在另外下载了。
下载Android SDK的时候，记得开VPN，否则你会等到天荒地老。
Android Studio下载地址，下面两个都行：
1、允许协议（android-licenses）
安装完成 Android Studio 和 Android SDK 之后，下面要做的就是允许协议（android-licenses）运行命令:
$ flutter doctor --android-licenses
然后让你输入Y/N的时候，一直输入Y就行了。输入N会失败，不要在挑战了。
如果出现下面错误，说明你的SDK版本不行，跑一下它给出的命令(建议开VPN,没有VPN也直接运行试试吧)。
A newer version of the Android SDK is required. To update, run: /Users/xxx/Downloads/android-sdk/tools/bin/sdkmanager --update
执行上面命令更新，可能会报错如下:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156) at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75) at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81) at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73) at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48) Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499) ... 5 more
我是没有遇到上面这个错误，但是有人遇到了我就顺便记录进来了。如果真遇到了请保证你的java版本大于或等于1.8（java8）就可以了，可以去官网下载。
更新好之后重新运行协议命令。
