title: runOnUpdateThread in andengine
body: <p>Could anyone explain exactly what this method does in AndEngine?</p>
  
  <pre><code>runOnUpdateThread(new Runnable() {
  
      @Override
      // to safely detach and re-attach the sprites
      public void run() {
  
  }
  
  
  });
  </code></pre>
  
  <p>EDIT: </p>
  
  <p>To be more specific, the runOnUpdateThread in general</p>