我正在尝试按照以下步骤创建Flutter插件：https://flutter.io/developing-packages/#step-1-create-the-package
flutter create --template=plugin -i swift hello
flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.9.4, on Mac OS X 10.14 18A391, locale en-DK)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[✓] Android Studio (version 3.2)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] VS Code (version 1.28.2)
[✓] Connected devices (1 available)
更新：我已经将Dart和Flutter插件添加到Android Studio（现在Flutter doctor都是复选标记），但仍然没有运行按钮。请注意，这是一个生成的插件。我可以创建一个新的Flutter项目，但是为此，我不知道如何运行示例应用程序？
我可以使用flutter run运行示例代码，但是在Android Studio中打开项目不会显示任何运行按钮吗？