R cannot be resolved - Android, no import android.R; statement

Question

Ok, I am working on a new app and everything worked fine as long as I used a Relative View. However, I want a tabbed layout so I switched what I had (not much so far since

Answer 1

If anything in your 'res' directory is named using illegal characters, this can happen.

Note that android only allows lower case letters (no capitals!!!), numerals, and the underscore. THAT'S ALL!

Almost every operating system allows other characters, so moving a file into your 'res' directory can easily create this problem.

Fix? Rename the file. This is done by right-clicking the file in your package or project explorer and selecting Refactor->Rename. You may need to clean your project after, but beware of the dreaded "import android.R" that may creep in.

Good luck! -scott