title: Android app showing offline map of some place say x
body: <p>how to make an Andrid app , which will show  some place x 's map offline , map data will be fetched from internet and will be part of resource for app .
  i will have maps rectanguler area (diagonal lat long co-ordinates) , i will somehow download tiles (map images ) given some zoom levels ,place them in app resources ,when the app runs , it should show those areas like google map shows , but only downloaded area .</p>