我也用我的ionic-cli v3.9.2遇到了这个问题，我发现问题是由位于 $ {YOUR_PROJECT_DIR} / platforms / android / cordova / lib / check_reqs中的文件报告的。 JS 。此文件中的 check_android_target 方法使用 android list targets --compact 命令检查是否已正确安装android env。但是这个检查的正确命令是 android list target --compact （注意目标不是目标）。也许这是旧版cordova中的拼写错误。

I also met this problem with my ionic-cli v3.9.2, and I found that the problem is reported by a file which is located in ${YOUR_PROJECT_DIR}/platforms/android/cordova/lib/check_reqs.js. The check_android_target method in this file use android list targets --compact command to check if you have installed android env correctly. But the correct command for this check is android list target --compact (notice target not targets) . Maybe it's a typo in old version cordova.

Ionic未集成最新版本的cordova。所以我的解决方案是手动修复这个错字并且它可以工作。

Ionic doesn't integrate the latest release of cordova. So my solution is fix this typo manually and it works.

更新：
当您解决第一个问题时，也许您会遇到另一个问题，即离子 - cli会告诉你，你没有安装模拟器，但你确实有一个。这是 $ {YOUR_PROJECT_DIR} platforms / android / cordova / lib / emulator.js 中的另一个错字。只需将安卓列表avds 更改为安卓列表avd 即可使其正常工作。

UPDATE： When you fix the first problem，maybe you will meet another problem that the ionic-cli will tell you that you don't have a emulator installed but you actually have one. It's another typo in ${YOUR_PROJECT_DIR}platforms/android/cordova/lib/emulator.js. just change android list avds to android list avd will make it work.

然后我发现还有一个问题导致模拟器无法启动。可能是这个会对你有帮助。

And then I found there's one more problems which causes the emulator can not be launched. May be this will help you.