public void requestDirections() {
   try {
     directionRequester.request(origin, destination, this);
   } catch (UnsupportedEncodingException uenc) {
     view.showError(R.string.message_error_encode);
   }
 }
 @Override
 public void onFailure(String error) {
   view.showError(R.string.message_error_unavailable_service);
 }