“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

这不是错误。如果你有错误关闭项目。然后打开项目在此之后，您可以得到一个错误

Cannot resolve symbol 'default_web_client_id'

可以通过在sting值中插入Web客户端ID来解决

2022-05-20 02:30:45

其他回答

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

显然，在我的例子中，这个问题通过在结尾添加一个“*”得到了解决

import android.R.*;

2013-09-05 19:34:26

在我的情况下:res/someLayout.xml文件出错，然后我解决它。然后清除该项目。错误消失了。

2015-12-25 16:23:42

我确实做了一个项目，而且成功了但在此之前，请尝试检查清单中的包名称，重新构建并清理项目。如果问题没有解决，那就放弃你的项目

2015-08-20 13:40:01

同样的问题。当我在我的可绘制文件夹中添加了一些图像并试图访问它们时开始。此外，添加的图像有大写字母的扩展名。这似乎使构建崩溃，因为即使我重命名它们，消息也是一样的，R是不可访问的。我所做的是，在.iml文件中，我寻找了excludeFolder并删除了它们(如下图所示):

  <excludeFolder url="file://$MODULE_DIR$/build/apk" />
  <excludeFolder url="file://$MODULE_DIR$/build/assets" />
  <excludeFolder url="file://$MODULE_DIR$/build/bundles" />
  <excludeFolder url="file://$MODULE_DIR$/build/classes" />
  <excludeFolder url="file://$MODULE_DIR$/build/dependency-cache" />
  <excludeFolder url="file://$MODULE_DIR$/build/incremental" />
  <excludeFolder url="file://$MODULE_DIR$/build/libs" />
  <excludeFolder url="file://$MODULE_DIR$/build/manifests" />
  <excludeFolder url="file://$MODULE_DIR$/build/res" />
  <excludeFolder url="file://$MODULE_DIR$/build/symbols" />
  <excludeFolder url="file://$MODULE_DIR$/build/tmp" />

在那之后，我重建了项目，R神奇地重新出现了。

2014-03-21 10:07:13

“无法解析符号R”在Android Studio

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