在已下载并配置好了Android studio的情况下Flutter的安装
1.下载flutter（系统 Windows 10）
https://flutter.dev/docs/development/tools/sdk/releases#windows
2.解压
在‘C:\flutter’解压flutter文件
3.配置环境
在导航栏的搜索框中输入‘env’，打开找到’环境变量‘，在’系统变量‘中的’path‘中添加flutter的bin目录地址
如我的地址是：’C:\flutter\flutter\bin‘
4.Android studio中flutter的配置
打开Android studio，找到’File‘-->'setting'-->'Plugins'，在搜索框中输入’flutter‘，找到’Flutter‘，
点击’Install‘，会有弹框，点击’OK‘，同时会提醒安装’Dart‘插件，选择’Accpet‘，
下载完成以后重启studio。
5.在导航栏的搜索框中输入Windows PowerShell，打开后输入flutter doctor检测flutter安装状况。
如：flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18362.657], locale zh-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
[√] Android Studio (version 3.4)
[!] Connected device
! No devices available
! Doctor found issues in 2 categories.
报了错（Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses）
可以运行flutter doctor --android-licenses
然后一直输入 y 就可以了
再次运行flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.8, on Microsoft Windows [Version 10.0.18362.657], locale zh-CN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[√] Android Studio (version 3.4)
[!] Connected device
! No devices available
