Flutter plugin not installed this adds Flutter specific functionality

問題：安裝flutter報

X  Flutter plugin not installed; this adds Flutter specific functionality.
    X  Dart plugin not installed; this adds Dart specific functionality.
X Connected device     ! No devices available

辦法：

打開你的Android sdudio進入setting，搜configs，點擊plugins
下載Dart和Flutter，完成重啓Android sdudio，再運行flutter doctor就可以了

這個報錯是flutter沒有檢測到AVD模擬器/手機

Connected device     ! No devices available

連接手機，使用USB連接手機就ok了