title: How to show markers on google map v2 which are only within a radius of a specific location?
body: <p>Let's say I've a lot of makers I made all over the map.
  But when I click a button, I want to show only markers from a radius(1km) of my current location and dismiss everything else. Is that possible? 
  I just don't want to pull every markers from SQLite and validate them if they are containing within 1km or not because validating millions markers will lower the app performance I thought. So, I wanted to do only in the view layer if possible.</p>