我得到在Eclipse IDE中的经典错误。我无聊的Eclipse的错误。他们快把我逼疯了。

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

我几乎尝试了所有这些建议作为溶液（谷歌搜索）。他们没有工作。

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

我的项目是工作正常，但不是code的变化。

My project was working normally but not code changes.

我看到我的code变化不作用于我的应用程序（的AVD）然后我打扫我的项目（​​在项目＆GT;清洁... ） 。 R.java 文件消失了，res文件夹是空的。

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.

现在我得到这个错误：研究不能被解析为一个变量

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

我应该怎么办？

和我也试图从现有的code删除的项目，并与再次创建Android项目我已经备份了。清洗后，它已经提供了同样的错误。

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.

任何想法，将AP preciated。

Any ideas would be appreciated.

推荐答案

我假定你已经更新ADT版本22，而不是如何产生R.java文件。

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

如果是这种情况，然后在这里是解决方案：

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

希望你知道Android的工作室拥有摇篮建设的工具。同在eclipse他们在Tools文件夹名为Android的SDK内建的工具，需要安装赋予了新的组件。打开Android SDK中管理器，选择新添加的构建工具，安装，更新后重新启动SDK管理器。

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.