“无法解析符号R”在Android Studio

In every instance in all of my classes where I reference R.id.something, the R is in red and it says "cannot resolve symbol R". Also every time there is R.layout.something it is underlined in red and says "cannot resolve method setContentView(?)". The project always builds fine. It is annoying to see this all the time. I have read many other questions on here about something similar but most involved importing projects from Eclipse. I am using what I believe to be the most recent version of Android Studio and the project was created with Android Studio and worked without any "cannot resolve R" problems. I would like to know what causes this if anyone knows.

当前回答

我不得不在android studio中导入我的R包。例如:import com.example。<包名称>。R

2014-07-23 21:11:16

其他回答

Build ->清理项目或重建项目或 File -> Invalidate cache / Restart…->失效并重启

2018-05-25 11:10:07

在我做“建立->清洁项目”和“同步项目与gradle”。它们都不是解。我从3.3.0 => 3.2.1(恢复为项目初始状态)下构建gradle版本，它解决了我的问题。

2019-01-30 05:02:08

我正面临一个错误“无法解析符号R” java文件中的R显示为红色。我已经解出来了。

不保存任何大写字母的图像像ABC.png。首先删除映像或重命名它。清洁项目重建项目

2018-09-27 11:34:59

我正在做一个多模块的项目。这发生在我把所有ui代码移到一个新模块时。