title: Java class file not generated for new activity in Android Studio
body: <p>I'm just starting out with Android development and in general I keep hitting brick walls that seem to have more to do with the IDEs then the anything else.  I started out with Eclipse but it kept corrupting my projects and other weird errors.  Now I'm trying Android Studio which seems more stable but again a brick wall:</p>
  
  <p>After following the android tutorial to the letter to create the hello world app I tried to add a new activity.  The xml file was created fine but the java class file did not show up under src like it did in eclipse.  What gives?  This is demoralizing me.  I long for the days of writing C code for microcontrollers using just an editor and cmd line.</p>
  
  <p>Thanks.</p>