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！
