在所有的类文件时出错，R不能得到解决 [英] Error in all the classes files: R cannot be resolved

问题描述

例如code：

setContentView(R.layout.main);

错误：

R cannot be resolved

有一个在所有的类文件，这个错误，我无法摆脱它。

There's this error in all the classes files, and I can't get rid of it.

我已经检查了XML文件，没有错误。

I already checked the XML files, there are no errors.

我已经确信，我不小心输入android.R。

I already made sure that I didn't accidentally import "android.R".

这个问题开始时，我试图清理和重建项目。

The problem started when I tried to Clean and Rebuild the project.

推荐答案

如果您已经更新了SDK工具，重新打开SDK管理器，在工具一节的Andr​​oid SDK构建工具检查已安装并最终，更新它们。昨天做的伎俩我。

If you already updated the SDK tools, re-open the SDK manager and check under the "Tools" section that "Android SDK Build tools" are installed and eventually, update them. That made the trick for me yesterday.

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