title: google cloud print from android without dialog
body: <p>Can someone tell me if it is possible to silently print using google cloud print from an android device? 
  The goal is that my app grabs a file from a URL or from the SD card and then sends it to a specific printer - all without interaction from anyone looking at the screen or touching anything. It will actually be triggered by a barcode scan on a blue tooth connected device. </p>
  
  <p>Thanks</p>