title: Load Recyclerview in a Thread when Activity starts
body: <p>I have a complex Recyclerview Adapter with two viewtypes. One for directories and the other one for documents. I make a few Database requests in the Adapter and I load a Bitmap(resized) into the document viewtype. </p>
  
  <p>The directory viewtype loads really fast but the document viewtype needs some time to load. I tried to set the Adapter in a Thread. But this influences the ui Thread and Animations are laggy and also sometimes the activity starts only after the the full Recyclerview is shown.</p>