首次完成配置 Flutter 环境后，通过 flutter doctor 检查 Android Studio 插件已正常安装。
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> flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.7.8+hotfix.4, on Mac OS X 10.14.6 18G87, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
....
....
[✓] Android Studio (version 3.5)
[!] IntelliJ IDEA Ultimate Edition (version 2019.1.3)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
[✓] Connected device (1 available)
! Doctor found issues in 4 categories.
但是用 Android Studio 的 New Flutter project 时IDE卡死，因为 Android Studio 配置插件后不会默认导入 Flutter 的环境变量。首先进入 Android Studio 设置：
搜索关键字 flutter，然后手动指定本地的 Flutter SDK path：
设置完毕后重启IDE，在尝试创建工程。如果依然卡死，请在环境变量内配置下载 Flutter 的中国依赖源。
