title: How can I bring an activity to the front from a background service
body: <p>First of all, I am aware my issue is against the philosophy of Android, but I have no choice, this application will run on a embedded car gps and I need to bring an activity to prevent from car accident, for example, when it's happen around the user. I have to put other activity on the back and bring my alert pop up without user manipulation like notification on the front.</p>
  
  <p>Is there a way to bring manually an activity to the front, by resuming it like when you click on the android task switcher?</p>