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

我按照上面的方法做了,但不管用。在我的例子中,当我在Android-L预览中每个Java函数都显示为红色时,我不得不设置JDK……

在Mac:

Click once on what is Red (or underlined) in your code (i.e. Activity, String). Click on the Red Light Bulb Point that appears on the left. Select "Setup JDK". Verify if annotations.jar and android.jar are in the current SDK version you are using (my case SDK 20 Android-L). You should also have the "res" folder, but I somehow still had it in the settings. If not, select the SDK and press "-". Then press "+" and locate the SDK folder on your computer (Mac: Applications > Android Studio.app > sdk). Select the version of the SDK you require (in my case 20 Android-L). Press Add. Build and Sync.

然后一切都恢复了正常。

其他回答

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

我在可绘制资源中添加了一些图像,其中一个图像被命名为“super.jpg”,这是一个原因。

重命名图像并在此之后将项目与gradle文件同步修复了错误。

我现在也有类似的问题。问题是在我的项目中,我有更多的模块。例如app模块和库模块。虽然类和R.string资源都来自app模块,但我在那里导入了com.package.library.R。不知怎的,Android Studio没有意识到这是一个错误,Gradle/Sync构建我的项目没有问题。但是当我试图运行单元测试时,Gradle构建失败,出现了所描述的错误。

package com.package.app

import com.package.library.R;
//...

class SomeClass {
  //...
  public void someMethod() {
     Toast.make(context, R.string.message, TOAST_LONG).show();
  }
}

当r .string. message资源实际上在我的com.packagename.app模块而不是com.packagename.library模块时。删除导入…解决了我的问题。

我也有这个问题。简单的“gradlew clean”和“gradlew build”就成功了。


点击Build->Clean Project,将执行gradle Clean

我在androidmanifest中有android:textAllCaps = "false",这对R文件造成了严重破坏。我删除了,一切正常。我认为目标sdk设置得不够高。