title: Android Studio - What is it?
body: <p>I just switched from Eclipse (API 18 JB) to Android Studio (LP 5.1v). First of all, "What the heck is gradle ?".The folders gen, bin, libs and src have seemed to be gone, Java files have migrated to a new folder. Only the 'res'seems to be in its place, whole. Please explain these things to me. Is the development here same as in the case of Eclipse.</p>
  
  <p>P.S.(I made a project in Eclipse with target android -18, it is not there by default in the AS. What is the size of API 18 JB 4.3 if I download it via SDK updates.)</p>
  
  <p>[I don't want theoretical answers, nor any links. Please provide some answers that may clarify my question.]</p>