title: Cannot resolve Symbol R, where is gen folder in Android Studio?
body: <p>I have created a dummy Android project from within Android studio, and I can make it run, but the Editor itself fails to find the R class. In fact I can't find the gen folder. I thought that maybe that folder should be added as a source folder or a classes dependency, but I just can't find it.</p>
  
  <p>Can anyone help?</p>