title: java.lang.IllegalArgumentException: InputStream cannot be null
body: <p>When i use this code to find the distance between two geo points and draw path between them, i get this exception</p>
  
  <pre><code>java.lang.IllegalArgumentException: InputStream cannot be null
  
  public class MapRouteActivity extends MapActivity {
      LinearLayout linearLayout;
      MapView mapView;
      private Road mRoad;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
          mapView = (MapView) findViewById(R.id.mapview);
          mapView.setBuiltInZoomControls(true);
          new Thread() {
              @Override
              public void run() {
                  double fromLat = 49.85, fromLon = 24.016667;
                  double toLat = 50.45, toLon = 30.523333;
                  String url = RoadProvider
                          .getUrl(fromLat, fromLon, toLat, toLon);
                  InputStream is = getConnection(url);
                  mRoad = RoadProvider.getRoute(is);
                  mHandler.sendEmptyMessage(0);
              }
          }.start();
      }
  
      Handler mHandler = new Handler() {
          public void handleMessage(android.os.Message msg) {
              TextView textView = (TextView) findViewById(R.id.description);
              textView.setText(mRoad.mName + " " + mRoad.mDescription);
              MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
              List&lt;Overlay&gt; listOfOverlays = mapView.getOverlays();
              listOfOverlays.clear();
              listOfOverlays.add(mapOverlay);
              mapView.invalidate();
          };
      };
  
      private InputStream getConnection(String url) {
          InputStream is = null;
          try {
              URLConnection conn = new URL(url).openConnection();
              is = conn.getInputStream();
          } catch (MalformedURLException e) {
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
          }
          return is;
      }
  
      @Override
      protected boolean isRouteDisplayed() {
          return false;
      }
  }
  </code></pre>