Eclipse错误：R无法解析为变量 [英] Eclipse error: R cannot be resolved to a variable

问题描述

我在Eclipse IDE中遇到这个经典错误。我厌倦了Eclipse的bug。他们让我疯狂。

我几乎尝试了所有建议作为解决方案（由谷歌搜索）。没有人工作。

我的项目正常工作，但没有代码更改。

我看到我的代码更改不会对我的应用程序（在AVD上）执行，然后我清理了我的项目（在 Project> Clean ... 下）。 R.java 文件已过，res文件夹为空。

现在我收到了错误： R无法解析为变量。

我该怎么办？

而且我也尝试删除项目并再次使用从现有代码中的Android项目创建我已经备份。清理后，已经有相同的错误。

任何想法都不胜感激。

解决方案>

我假设你已经更新了版本22的ADT，并且没有生成R.java文件。

如果是这种情况，那么这里是解决方案：

希望你知道Android studio有毕业生的工具。与eclipse相同，他们在Tools文件夹中提供了一个新的组件，这个文件夹叫做需要安装的Android SDK Build-tools。打开Android SDK管理器，选择新添加的构建工具，安装它，更新后重新启动SDK Manager。

I am getting this classic error in Eclipse IDE. I am bored of Eclipse's bugs. They driving me mad.

I almost tried everything which suggested as solution (by Googling). None of them worked.

My project was working normally but not code changes.

I see that my code changes does not acting on my app (on AVD) then I cleaned my project (under Project > Clean...). R.java file was gone and res folder was empty.

Now I am getting that error: R cannot be resolved to a variable.

What should I do?

And also I tried to delete project and create again with Android Project from Existing Code I've backed-up before. It already gives same error after cleaning.

Any ideas would be appreciated.

解决方案

I assume you have updated ADT with version 22 and R.java file is not getting generated.

If this is the case, then here is the solution:

Hope you know Android studio has gradle building tool. Same as in eclipse they have given new component in the Tools folder called Android SDK Build-tools that needs to be installed. Open the Android SDK Manager, select the newly added build tools, install it, restart the SDK Manager after the update.

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