title: Listening for keywords at all times, like "Ok google" on 4.4
body: <p>I've checked the new Kitkat libraries to make sure that I'm not missing something. I want my application to always listen to a keyword before performing an action, just like how Google Now always listens for the keywords "Ok google" on the homescreen. </p>
  
  <p>How did Google accomplish this?</p>