title: How to share the progressbar's progress in two different activities
body: <ul>
  <li>In an activity A I download several files from the server to my device.</li>
  <li><p>A progressBar shows the progress of the current download.</p></li>
  <li><p>I can do multiple downloads at once and I want an activity B shows a list of all my downloads with progressBar for each download.</p></li>
  </ul>
  
  <p>-The problem is that I do not really know how to share the progress of each download to activity B when I start it via a menu.</p>