Android Rendering Problems Couldn't resolve resource @string/app_name

Question

I\'m new to android programming and I don\'t understand what I\'m doing wrong. I try to make a button like this in the xml file:

Answer 1

I had the same problem with all 5 buttons in my main activity - searched all over the place for what might be wrong, didn't find anything - so I decided to run it on a physical device - all buttons displayed as wanted (didn't give them any function at this stage though) and when I got back to the layout window, the error just wasn't there anymore - you might give that a try...