FVM官网

https://fvm.app/docs/getting_started/installation/

参考

https://www.cnblogs.com/ybmj/p/15955420.html
http://www.manongjc.com/detail/28-pusxchmmantflah.html

安装前电脑里已经有了flutter ，版本太高导致很多旧版本运行不起来。
原先已经有了环境变量的配置。

E:\*****\bin
E:\*****\flutter\bin\cache\dart-sdk\bin

1.安装

dart pub global activate fvm

Warning: Pub installs executables into C:\Users\Administrator\AppData\Local\Pub\Cache\bin, which is not on your path.
You can fix that by adding that directory to your system’s “Path” environment variable.

2.配置FVM环境变量

将上面的 警告里路径复制下来 ，添加到环境变量中~

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  完成后测试

fvm

出现 Flutter Version Management: A cli to manage Flutter SDK versions.

3.修改一下fvm文件缓存地址，以免以后下载的flutter sdk下载到C盘

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4. 默认fvm的下载地址是在C盘，修改fvm缓存地址

fvm config --cache-path E:\Flutter\FlutterSDK\

5.下载安装Flutter SDK

1.使用命令下载
fvm install 版本号

fvm install 2.10.0

2.Flutter中文资源网https://flutter.cn/docs/development/tools/sdk/releases，使用IDM等软件下载压缩包，解压到E:\Flutter\FlutterSDK\文件夹中

6. 将原来电脑上的SDK复制到E:\Flutter\FlutterSDK\ 下改名为版本号

这是我原先的版本3.9.0
复制时可能会出现文件占用的问题，我是直接重启解决的~
2.10.0 是上一步用命令下载的。

7.系统path中的默认Flutter路径修改

修改的路径是上一步复制的文件夹下~

配置好了就 关掉bat窗口 重新 cmd

C:\Users\Administrator>fvm list
Cache Directory:  E:\Flutter\FlutterSDK3.9.0-1.0
2.10.0

8.SDK版本切换

在CMD窗口通过fvm list可以查看fvm中已经缓存的所有sdk版本

使用fvm use<版本号>命令时一定要在管理员模式 下打开

切换完成后使用fvm flutter doctor。配置对应的环境

出现问题1：

S E:\Demo\flutter_demo\flutter_luckin_coffee-v2.0> fvm flutter doctor
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.10.0, on Microsoft Windows [Version 10.0.15063], locale zh-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Chrome - develop for the web
[!] Visual Studio - develop for Windows (Visual Studio Community 2017 15.9.4)X Visual Studio 2019 or later is required.Download at https://visualstudio.microsoft.com/downloads/.Please install the "Desktop development with C++" workload, including all of its default components
[!] Android Studio (version 2022.1)X Unable to find bundled Java version.
[√] VS Code, 64-bit edition (version 1.77.0)
[√] Connected device (3 available)
[!] HTTP Host AvailabilityX HTTP host https://maven.google.com/ is not reachable. Reason: An error occurred while checking the HTTP host: 信号灯超时时间已到

解决：
找到切换到的的 flutter sdk 安装目录，在此目录下找到 \packages\flutter_tools\gradle 文件夹，打开 flutter.gradle 文件,搜索 buildscript，(我的目录是E:\Flutter\FlutterSDK\2.10.0\packages\flutter_tools\gradle)

        maven { url 'https://maven.aliyun.com/repository/jcenter' }maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}maven { url 'https://dl.google.com/dl/android/maven2/'}

问题2：，出现OpenSSL SSL_read: Connection was reset, errno 10054

C:\Windows\System32>fvm install 2.10.5
Flutter "2.10.5" is not installed.Installing version: 2.10.5...
Cloning into 'E:\Flutter\FlutterSDK\2.10.5'...
fatal: unable to access 'https://github.com/flutter/flutter.git/': OpenSSL SSL_read: Connection was reset, errno 10054Could not install 2.10.5Please run command with  --verbose if you want more information

解决 参考https://www.jianshu.com/p/8148e943b07e：
法一：

git config --global http.postBuffer 524288000

法二：

git config --global http.sslVerify false

问题3：

PS E:\Demo\flutter_demo\flutter_luckin_coffee> fvm flutter doctor
Flutter assets will be downloaded from https://storage.flutter-io.cn. Make sure you trust this source!
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.10.5, on Microsoft Windows [Version 10.0.15063], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Chrome - develop for the web
[!] Visual Studio - develop for Windows (Visual Studio Community 2017 15.9.4)X Visual Studio 2019 or later is required.Download at https://visualstudio.microsoft.com/downloads/.Please install the "Desktop development with C++" workload, including all of its default components
[!] Android Studio (version 2022.1)X Unable to find bundled Java version.

解决方法：
https://blog.csdn.net/woshidanoob/article/details/128779709

9. Android Studio中设置

10.最终运行

fvm flutter run 

分享开源的FVM 窗口化管理软件 sidekick

sidekick开源地址：
https://github.com/fluttertools/sidekick
注意：程序需要 管理员模式 打开

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