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

Had the same problem but cleaning the project didn't solve anything even with correct xml. This is what I did

a) Make sure the java builders are checked as in the pic below. If they are , uncheck and check again

b) Insert a dummy value eg in layout add a button

c) Clean project