title: showing download percentage with Download Manager
body: <p>I am using Download Manager in android to download images and Videos from a particular Url.</p>
  
  <p>So, When Downloading is in Progress, I am displaying a simple <code>Progressbar</code>.</p>
  
  <p>Instead, I wanna to display custom Progressbar, which display the progress of content downloaded. That means It should display a view so that User can know that How much data is downloaded. </p>
  
  <p>Just like WhatsApp is doing with downloading images and videos.</p>
  
  <p>Thanks.</p>