PS C:\Users\QinZhimou> flutter doctor

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v0.5.1, on Microsoft Windows [Version 10.0.17134.165], locale zh-CN)
[!] Android toolchain - develop for Android devices (Android SDK 28.0.1)
    X Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[√] Android Studio (version 3.1)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[!] Connected devices
    ! No devices available
! Doctor found issues in 2 categories.

上面有两个问题：

一、Android licenses not accepted， 按提示执行如下命令

flutter doctor --android-licenses

然后一路输入Y 回车即可。

二、Flutter plugin not installed 和 Dart plugin not installed

这个问题是 Android Studio 没有安装 Flutter 插件和 Dart 插件。这个插件安装比较简单，按照相关说明操作即可，此处不再详解。