安装Flutter
1、配置HomeBrew
我们在去配置Flutter的环境之前，需要先检查一下HomeBrew是不是最新的。
$ brew update
如果没有brew的话，可以去HomeBrew官网自行下载。或者参考https://www.jianshu.com/p/a102fe231b33
如果重新下载的话，看到下面的打印信息就说明下载完毕了。
image.png
2、下载SDK
接下来就是去官网下载SDK了。注意，这里下载SDK有两种方法，一是直接git clone -b beta https://github.com/flutter/flutter.git下载，二是自己在flutter官网
下载
我是直接从官网下载的，下载完之后，是一个名字叫flutter_macos_v1.5.4-hotfix.2-stable.zip的压缩包。
然后我们解压这个zip包，把解压出来的flutter文件放到根目录下即可。
3、配置环境变量
因为Flutter的SDK中包含了很多的命令行工具。我们就需要配置环境变量，所以我直接就安装到了根目录下了。
配置镜像
我们跳转到根目录
cd ~
就能找到这个.bash_profile隐藏文件，我们用vim打开这个文件
vim ~/.bash_profile
然后需要输入就把A键按一下进入编辑模式，把下面三个环境变量配置进去
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
export PATH=/Users/guojingrui/flutter/flutter/bin:$PATH
注意下，第三个环境变量这里/Users/guojingrui/flutter/是我的根目录，然后/flutter/是我们刚刚解压的的zip包里面的flutter文件夹。上面两个环境变量是两个镜像地址。
然后按esc键退出 输入“:wq”保存并退出vim
输入如下命令：
source ~/.bash_profile
最后我们就可以验证一下flutter环境有没有配置成功了。输入：
flutter -h
这一步可能需要等待很长时间，做好准备等着就行。。。
看到如下如的打印信息就是配置成功了
101583055391_.pic_hd.jpg
111583055391_.pic_hd.jpg
4、配置Android Studio
如果没有下载Android Studio的话，就去官网去下载一下。
或者参考：https://www.jianshu.com/p/29b1a0c2b4f7
我们用flutter doctor命令去检查一下flutter的环境配置，我们可以看到如下打印
WeChatb447741171912937f101f9b0dd962b0f.png
这里的每个✗都是我们要去解决的问题。
运行Android studio下载配置项及 flutter dart插件之后，再执行flutter doctor，此时结果
WeChatbf651d12bbdb20dac03d1b8461cb7887.png
解决问题
[!] Flutter (Channel stable, v1.7.8+hotfix.4, on Mac OS X 10.15.4 19E287, locale
zh-Hans-CN)
✗ Downloaded executables cannot execute on host.
See https://github.com/flutter/flutter/issues/6207 for more information
直接运行flutter upgrade 安装个最新版本的就好了
% flutter upgrade
Upgrading Flutter from /Users/yifanguo/flutter...
From https://github.com/flutter/flutter
+ 20e59316b...b041144f8 stable -> origin/stable (forced update)
* [new branch] Hixie-patch-1 -> origin/Hixie-patch-1
+ 20e59316b...f994b7697 beta -> origin/beta (forced update)
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0a39d8d92..c264b70ec dev -> origin/dev
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Updating d51fd86cd..b041144f8
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4237 files changed, 411511 insertions(+), 133278 deletions(-)
mode change 100755 => 100644 dev/manual_tests/android/gradle/wrapper/gradle-wrapper.properties
Upgrading engine...
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Building flutter tool...
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Downloading Android Maven dependencies...
Failed to download the Android dependencies
Downloading Android Maven dependencies... 142.7s (!)
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Downloading android-arm-profile/darwin-x64 tools... 0.4s
Downloading android-arm-release/darwin-x64 tools... 0.3s
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Downloading android-x64-profile/darwin-x64 tools... 0.4s
Downloading android-x64-release/darwin-x64 tools... 0.3s
Downloading android-x86 tools... 2.1s
Downloading android-x64 tools... 2.5s
Downloading android-arm tools... 1.1s
Downloading android-arm-profile tools... 0.6s
Downloading android-arm-release tools... 0.4s
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Downloading android-arm64-release tools... 0.5s
Downloading android-x64-profile tools... 0.6s
Downloading android-x64-release tools... 0.5s
Downloading android-x86-jit-release tools... 1.1s
Downloading ios tools... 3.9s
Downloading ios-profile tools... 2.8s
Downloading ios-release tools... 20.4s
Downloading package sky_engine... 0.2s
Downloading flutter_patched_sdk tools... 1.1s
Downloading flutter_patched_sdk_product tools... 1.1s
Downloading darwin-x64 tools... 4.1s
Downloading libimobiledevice... 0.1s
Downloading usbmuxd... 0.1s
Downloading libplist... 0.1s
Downloading openssl... 0.2s
Downloading ios-deploy... 0.1s
Downloading darwin-x64/font-subset tools... 0.3s
Oops; flutter has exited unexpectedly.
Sending crash report to Google.
Failed to send crash report due to a network error: SocketException: OS Error: Operation timed
out, errno = 60, address = clients2.google.com, port = 49832
Crash report written to /Users/yifanguo/flutter_01.log;
please let us know at https://github.com/flutter/flutter/issues.
问题
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执行
flutter doctor --android-licenses
输出
Android sdkmanager tool not found
(/Users/***/Library/Android/sdk/tools/bin/sdkmanager).
Try re-installing or updating your Android SDK,
visit https://flutter.dev/setup/#android-setup for detailed instructions.
前往文件夹 ~/资源库/Android/sdk，找到android sdk路径发现没有安装tools，在SDK manager找到tools下载安装即可
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安装完成之后，再次执行flutter doctor
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根据提示执行命令
flutter doctor --android-licenses
一路y下来，会发现有All SDK package licenses accepted出现
% flutter doctor --android-licenses
Warning: File /Users/guojingrui/.android/repositories.cfg could not be loaded.
5 of 7 SDK package licenses not accepted. 100% Computing updates...
Review licenses that have not been accepted (y/N)? y
1/5: License android-googletv-license:
---------------------------------------
Terms and Conditions
This is the Google TV Add-on for the Android Software Development Kit License Agreement.
1. Introduction
······
······
10.8 Open Source Software. In the event Open Source software is included with Evaluation Software, such Open Source software is licensed pursuant to the applicable Open Source software license agreement identified in the Open Source software comments in the applicable source code file(s) and/or file header as indicated in the Evaluation Software. Additional detail may be available (where applicable) in the accompanying on-line documentation. With respect to the Open Source software, nothing in this Agreement limits any rights under, or grants rights that supersede, the terms of any applicable Open Source software license agreement.
---------------------------------------
Accept? (y/N): y
All SDK package licenses accepted
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再次执行flutter doctor
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完美解决~~
如果提示，需要升级SDK
[✗] Android toolchain - develop for Android devices (Android SDK version 24.0.2)
✗ Flutter requires Android SDK 28 and the Android BuildTools 28.0.3
升级SDK命令如下
"/Users/***/Library/android/sdk/tools/bin/sdkmanager" "platforms;android-28" "build-tools;28.0.3"
或者
/Users/***/Library/android/sdk/tools/bin/sdkmanager --update
5. 配置安卓模拟器
打开Tools-AVDManager,如图
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选择设备
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选择系统
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最后点击下载就完成了。
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执行flutter doctor如图
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6、配置iOS环境
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根据提示执行如下两个命令
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -runFirstLaunch
执行flutter doctor
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