进入 eclipse后，菜单 --> Project --> clean，这样的操作就相当于把R文件删了，然后再自动生成R文件。如果没有自动生成R文件，那么就是程序中有错误，一般情况下是命名问题。
我遇到的情况是：（1）layout文件夹中，不同的 xml文件中控件命名冲突（因为我是直接复制的）。
此时的解决方法：控件命名要唯一，即把崇明的控件名称都改掉，然后clean项目，R文件就会自动生成。
（2）res文件夹中只能包含相应的文件夹，不能有文件或图片存在。
（3）res文件夹中的文件名称都必须是小写
总之，只要res文件没有错误，R文件会自动生成。
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