消息“顫動運行：沒有連接的設備” - Message "flutter run: No connected devices"

問題：

I am trying to create a sample application with Flutter (fresh installation).我正在嘗試使用 Flutter（全新安裝）創建示例應用程序。 Android Studio is also installed (fresh installation).還安裝了Android Studio （全新安裝）。

Here is the output of flutter run這是flutter run的輸出

flutter run
No connected devices.

The output of flutter doctor : flutter doctor的輸出：

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.1.5, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] Android Studio (version 3.0)
[!] VS Code (version 1.20.1)
[!] Connected devices
! No devices available

! Doctor found issues in 2 categories.

Is there a solution to this problem?這個問題有解決方案嗎？

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解決方案：

參考一： https://en.stackoom.com/question/3Jmwj
參考二： https://stackoom.com/question/3Jmwj