“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

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

其他回答

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

做:建立>清洁项目

重要:确保在消息窗格(Alt+0)中清除项目后没有任何错误。如果您发现任何带有感叹号的红色圆圈，那么您必须删除代码中的这些错误。

这些错误大多与@string/或@array/有关。再次清洁项目，完成!

2016-04-27 04:37:32

我受够了

我可绘制资源中的一个大写字母。导入安卓。R由Android Studio(或Eclipse)添加 xml文件错误

2013-09-24 14:54:10

更改最新的SDK版本，这对我来说是工作

1.单击文件，然后单击项目结构 2.然后选择app 然后点击确定，这对我有用。

2015-09-20 11:07:48

我也遇到过类似的问题，我是这样做的:

清洁项目和同步项目与Gradle，

检查buildTools版本在我的sdk

从build gradle (module)中将minSdkVersion从8修改为9

defaultConfig {
        applicationId "PackageName"
        minSdkVersion 9
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }

但这一切都无济于事。

最后我找到了答案(这对我来说很管用)

从build.gradle(module:app)更改

android {
    compileSdkVersion 21
    buildToolsVersion '21.0.1'
......
....
}

选择文件|项目结构将构建工具版本更改为21.1.1

2015-05-03 15:11:15

“无法解析符号R”在Android Studio

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