title: geofire android to store and retrive locations and display it on map
body: <p>I am developing an taxi application in android. I need to store retrieve and update location of my cabs and show it on maps using geofire. I have used firebase for authentication.</p>
  
  <p>Need a <strong>complete</strong> tutorial for android geofire but can't find any</p>
  
  <p>I have also seen SFVehicle example but didn't understand much</p>
  
  <p>Any help would be appreciated!!!</p>