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Since I upgraded my IDE and I have been getting an error
r cannot be resolved to a variable. This is the error.
Ben JakubenTreehouse Teacher
This is an unfortunate error. I think the most common solution for me is this one: http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error (answer)
This can happen for a number of reasons. Your best bet is to look at the types of errors and where they are occurring and then matching up with one of the many solutions on StackOverflow, like this one: http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error (full question)