出现 Error running adb: No Android device found. Please connect a device and follow t he instructions here to enable USB debugging: https://developer.android.com/studio/run/device.html#developer-device-options. I f you are using Genymotion go to Settings -> ADB, select "Use custom Android SDK tools", and point it at your Android SDK directory. 表示夜神模拟器未启动或者 adb 未连接到夜神,用 adb devices 查看是否连接