title: onActivityResult() Uri to Byte array
body: <p>I want to get from an Android Uri (of the kind returned by
  onActivityResult) to a simple byte array, in order to upload a file as
  part of a multipart message. Can anyone provide an example of how to
  get from a Uri to a byte[] array?</p>
  
  <p>Edit: I mean the <code>android.net.Uri</code> Uri</p>