title: Generated source files should not be edited?
body: <p>When I create this <code>new class</code> <em>Quake</em> and try to write some code in it ,it displays the following message,
  <img src="https://i.stack.imgur.com/C15Fk.png" alt="enter image description here"></p>
  
  <p>and when I try to <code>run it</code> Android Studio <code>automatically delete</code> the class <code>Quake</code>.</p>
  
  <p><img src="https://i.stack.imgur.com/ivxz7.png" alt="enter image description here"></p>
  
  <p>Can someone explain me why is this happening and how to resolve it ?</p>