title: how to get android firmware version installed in phone?
body: <p>while developing an application how to get current operating system version installed in mobile phone?</p>
  
  <p>for example,</p>
  
  <p>1.5,2.1 etc..</p>
  
  <p>can any one guide me how to get it?</p>
  
  <p>any help would be appriciated.</p>