Missing R.java file even though project cleaned

Question

Every time in code that I have an R, I get an error R cannot be resolved to a variable.

The R.java file appears to be missing.

I have tried cleaning the proj

Answer 1

That happens when the project cannot be build, because the project name may not be sufficient for building.

You need to create another project without any unacceptable symbols and copy all code files (.java, xml files, etc) and paste it to newly created project. Then clear your project (project -> clean) and select the build automatically option.