title: OSMDroid Set Zoom for Show All Marker (bounding Marker)
body: <p>I use OSMDroid for mapview library.</p>
  
  <p><a href="https://stackoverflow.com/questions/23842526/osmdroid-bounds-marker">OSMdroid bounds marker</a>
  form this link i understand for use <code>zoomToBoundingBox</code> method </p>
  
  <p>when I have 20 marker on map 
  I want to visible on display. 
  how to use zoomToBoundingBox,</p>
  
  <p>or how to set (north, east, south, west) of BoundingBoxE6
  or (northE6, eastE6, southE6, westE6)</p>
  
  <p>Thank you very much.</p>