title: Notification when I'm near a stored location
body: <p>I currently write on an app which should give me information about the places in my area. I've already built a function that indicates how far a user is away from a location (via GPS).</p>
  
  <p>Now I want that the user gets an information at a certain distance to a place (eg 20 meters).</p>
  
  <p>For that I have the following questions:</p>
  
  <ol>
  <li>How can I get that the app continues in the background (including GPS) and checks the current distance to a place?</li>
  <li>How can I find / notify the user when he/she is in the vicinity of a place and the app itself is only running in the background (eg when the screen is locked). I would have preferred that the LED on the device lights / the phone vibrate briefly and the information can be seen, such as in a text message.</li>
  </ol>
  
  <p>Even now, many thanks for your help,</p>
  
  <p>a small programmer who is still at the very beginning</p>