错误:模块'app':找不到平台'android-28'.和设计编辑器在成功完成项目同步之前不可用 [英] ERROR: Module 'app': platform 'android-28' not found. and Design editor is unavailable until after a successful project sync

问题描述

所以，我是新来的，刚刚安装了Android Studio，然后想要创建一个基本活动.但是，问题是他们要我安装未通过SDK管理器安装的SDK和Haxm.我已经尝试了很多，并使用了Stack-overflow中说明的所有方法来消除这种情况，但是它们的方法都没有起作用.

So, I am new here just installed Android Studio and then wanted to create a basic activity. But the thing is they want me to install the SDKs and Haxm which is not being installed through SDK manager. I have tried a lot and have used all the ways stated in Stack-overflow to get rid of this but none of their ways has functioned.

推荐答案

转到工具"->"sdk管理器"->安装API级别28，然后重新启动.

Go to Tools->sdk manager->install API Level 28 then restart.

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