title: Classes vs Activities in Android
body: <p>I'm a beginner in Android development but not in programming itself. Anyway, this question might be a bit dumb.</p>
  
  <p>The question is: Are all classes in Android activities related to a UI element? I want to have  a "regular" Java class from which i can normally create objects and i'm not figuring out how to "define it" and how to "call" it.</p>
  
  <p>Any help would be much appreciated. Thanks</p>