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in every instance in all of my classes where I reference r.id.something , the R is in red and it says “cannot resolve symbol R. in all instances of all classes that I refer to r.id.something , the R is in red and displays” cannot resolve symbol R “ Also every time there is R.layout.something it is underlined in red and says “cannot resolve method setContentView(?)”. similarly, every time there is r.layout.something it will use a red underline to indicate “unable to parse method setcontentview (?)” The project always builds fine It’s annoying to see this all the time I have read many other questions on here about something similar but most involved importing projects from eclipse. I have read many other questions here, which are related to similar but most involved importing projects from eclipse I am using what I believe to be the most recent version of Android studio and the project was created with Android studio and worked without any “cannot resolve R” problems. I am using what I think is the latest version of Android studio, and the project was created with Android studio, And it can work normally without any “unsolvable R” problem I would like to know what causes this if anyone knows