R.layout.anylayoutname can not be resolved after copy-paste from another project

When I copy the Different Xml Files From Another Projects(Downloaded From the Net), The R class is not Resolving the Error, because th开发者_开发技巧e id is not generated in R.java.There is Some Problem In Accessing The layouts in res folders. What Should I Do in that case?

Just Clean and build your project in eclipse ... this will solve your problem