参照 Flutter中文网 的教程进行到运行运行 flutter doctor命令后出现了几个错误

错误1

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses

错误2

 Android Studio (version 3.3)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.

错误3

 Connected device
    ! No devices available

错误1参照提示，运行flutter doctor --android-licenses，期间需要几次按"y"确认，
一路"y"下来后提示All SDK package licenses accepted，问题解决。

再次运行flutter doctor后发现“错误1”和“错误3”都已经得到了解决。

下面解决“错误2”

在android studio中, 打开plugin，搜索“flutter”，然后点击中间的“Search in repositories”

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选择人数最多的这个，然后点击“Install”安装

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再次运行flutter doctor，OK，大功告成！