title: zoom in or out to display the path between two markers (android google maps v2)
body: <p>I'm sorry for my bad english,</p>
  
  <p>I want to display the path between two markers and do an zoom out or in to display also the origin marker and the destination marker.</p>
  
  <p>Thank you.</p>
  
  <pre><code>    polyline = mMap.addPolyline(lineOptions);
      polyline.isVisible();
      LatLngBounds.Builder builder = new LatLngBounds.Builder();
      builder.include(origin);
      builder.include(destination.getPosition());
      LatLngBounds bounds = builder.build();
      mMap.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds,20));
  </code></pre>