“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

只需清理你的项目和同步项目与Gradle文件。

问题会得到解决。

2015-01-16 13:45:32

其他回答

我有我的XML文件在一个布局文件夹，而不是菜单文件夹。

这是我们从Eclipse转移到Android Studio的结果。

解决方案对我来说很简单……将XML文件移动到MENU文件夹并重新编译。

2013-12-03 22:40:08

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

对我有用的是:

创建一个新项目。发现R在工作! 比较了所有的配置。在gradle文件中发现了差异: 同步，它又工作了!

2016-06-17 12:47:25

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

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

“无法解析符号R”在Android Studio

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