Android错误之--activity_main cannot be resolved or is not a field
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一般在copy别人的项目中会容易出现本错误，截图如下：
出现本错误的一般有两种情况
第一种情况：导包错误--检查import，找到这个：
删除之，再重新导入含有包名的R文件。
第二种情况：本情况应该更为多见，一般为布局文件中有错误，而无法生存R文件，可以检查一下：
你会发现果真没有生成R文件，这时你需要解决的就是查找布局文件中的错误，改正错误，生成R文件之后，本错误就会消失啦！
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