cordova打包apk时出错Failed to install the following Android SDK packages as some licences have not been a

我在打包apk时出现如下错误提示：

FAILURE: Build failed with an exception.
A problem occurred configuring project ‘:app’.
Failed to install the following Android SDK packages as some licences have not been accepted.
platforms;android-28 Android SDK Platform 28
To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.

原因：没有获取到license的问题，请接受SDK许可协议并使用androidstudiosdk管理器安装缺少的组件。
解决方法：命令行，cd到Android sdk安装目录的tools\bin下，输入sdkmanager --update 不行的话就输入sdkmanager --licenses；

之后会出现如下：只要y即可，然后再打包就能成功。