运行ionic cordova run android -c 在

报错：

UnhandledPromiseRejectionWarning: CordovaError: No emulator images (avds) found.
1. Download desired System Image by running: /Users/gm/Library/Android/sdk/tools/android sdk
2. Create an AVD by running: /Users/gm/Library/Android/sdk/tools/android avd
HINT: For a faster emulator, use an Intel System Image and install the HAXM device driver

解决：手机上的开发者选项---打开USB调试功能