title: How to calculate distance using coordinates from LocationManager
body: <p>I am using LocationManager to get the values of Latitude and Longitude of a user. These values are updated regularly to a database.</p>
  
  <p>Now, i want to find out the distance between two users basing on the stored Latitude and Longitude values. I want to display a message when distance between two users is less than (say 100 meters). Can anyone please guide me with a tutorial or some sample code of how to achieve it.</p>