在Android MapView上绘制两个GeoPoints之间的路线时出错？

Question

我正在使用此方法在我的应用程序中在地图上的两个点之间绘制路线

 private void DrawPath(GeoPoint src, GeoPoint dest, int color,
          MapView mMapView01) {


        // connect to map web service
        StringBuilder urlString = new StringBuilder();
        urlString.append("http://maps.google.com/maps?f=d&hl=en");
        urlString.append("&saddr=");//from
        urlString.append( Double.toString((double)src.getLatitudeE6()/1.0E6 ));
        urlString.append(",");
        urlString.append( Double.toString((double)src.getLongitudeE6()/1.0E6 ));
        urlString.append("&daddr=");//to
        urlString.append( Double.toString((double)dest.getLatitudeE6()/1.0E6 ));
        urlString.append(",");
        urlString.append( Double.toString((double)dest.getLongitudeE6()/1.0E6 ));
        urlString.append("&ie=UTF8&0&om=0&output=kml");
        Log.d("xxx","URL="+urlString.toString());


        try
        {
          URL url = new URL(urlString.toString());
          urlString = null;
          HttpURLConnection urlConnection=(HttpURLConnection)url.openConnection();
          urlConnection.setRequestMethod("GET");
          urlConnection.setDoOutput(true);
          urlConnection.setDoInput(true);
          urlConnection.connect();

          DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
          DocumentBuilder db = dbf.newDocumentBuilder();
          Document doc = db.parse(urlConnection.getInputStream());

          if(doc.getElementsByTagName("GeometryCollection").getLength()>0)
          {

            String path = doc.getElementsByTagName("GeometryCollection").item(0).getFirstChild().getFirstChild().getFirstChild().getNodeValue() ;
            Log.d("xxx","path="+ path);
            String [] pairs = path.split(" ");
            String[] lngLat = pairs[0].split(","); // lngLat[0]=longitude lngLat[1]=latitude lngLat[2]=height
            // src
            GeoPoint startGP = new GeoPoint((int)(Double.parseDouble(lngLat[1])*1E6),(int)(Double.parseDouble(lngLat[0])*1E6));

            GeoPoint gp1;
            GeoPoint gp2 = startGP;



            for(int i=1;i<pairs.length;i++) // the last one would be crash
            {
              lngLat = pairs[i].split(",");
              gp1 = gp2;
              // watch out! For GeoPoint, first:latitude, second:longitude
              gp2 = new GeoPoint((int)(Double.parseDouble(lngLat[1])*1E6),(int)(Double.parseDouble(lngLat[0])*1E6));



              mapRouteOverlay = new MapRouteOverlay(gp1,gp2,2,color);

              mMapView01.getOverlays().add(mapRouteOverlay);
              Log.d("xxx","pair:" + pairs[i]);
              Log.e("Check  ","Draw  " + mapRouteOverlay);
            }

          }
        }
        catch (MalformedURLException e)
        {
          e.printStackTrace();
        }
        catch (IOException e)
        {
          e.printStackTrace();
        }
        catch (ParserConfigurationException e)
        {
          e.printStackTrace();
        }
        catch (SAXException e)
        {
          e.printStackTrace();
        }


      }

这种方法工作正常(从最近三个月)到绘制路径但形成约15天它给出问题而不显示/绘制路径.

我的logcat输出是

 08-11 10:15:47.363: W/System.err(401): org.xml.sax.SAXParseException: unterminated entity ref (position:ENTITY_REF &@1:808 in java.io.InputStreamReader@44f9cde8) 
 08-11 10:15:47.373: W/System.err(401):     at org.apache.harmony.xml.parsers.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:153)
 08-11 10:15:47.373: W/System.err(401):     at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:110)
 08-11 10:15:47.373: W/System.err(401):     at com.map.MapMainActivity.DrawPath(MapMainActivity.java:621)
 08-11 10:15:47.373: W/System.err(401):     at com.map.MapMainActivity.getDirection(MapMainActivity.java:582)
 08-11 10:15:47.373: W/System.err(401):     at com.map.MapMainActivity$DownloadWebPageTask.onPostExecute(MapMainActivity.java:1318)
 08-11 10:15:47.373: W/System.err(401):     at com.map.MapMainActivity$DownloadWebPageTask.onPostExecute(MapMainActivity.java:1)
 08-11 10:15:47.373: W/System.err(401):     at android.os.AsyncTask.finish(AsyncTask.java:417)
 08-11 10:15:47.373: W/System.err(401):     at android.os.AsyncTask.access$300(AsyncTask.java:127)
 08-11 10:15:47.373: W/System.err(401):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
 08-11 10:15:47.373: W/System.err(401):     at android.os.Handler.dispatchMessage(Handler.java:99)
 08-11 10:15:47.373: W/System.err(401):     at android.os.Looper.loop(Looper.java:123)
 08-11 10:15:47.383: W/System.err(401):     at android.app.ActivityThread.main(ActivityThread.java:4627)
 08-11 10:15:47.383: W/System.err(401):     at java.lang.reflect.Method.invokeNative(Native Method)
 08-11 10:15:47.383: W/System.err(401):     at java.lang.reflect.Method.invoke(Method.java:521)
 08-11 10:15:47.383: W/System.err(401):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
 08-11 10:15:47.383: W/System.err(401):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
 08-11 10:15:47.383: W/System.err(401):     at dalvik.system.NativeStart.main(Native Method)

我无法理解这是什么问题？任何帮助？

提前致谢.

Answer 1

看到这个链接绝对可以帮到你.因为自2012年7月27日以来Google解析KML文件的谷歌路线不再可用(因为谷歌已经改变了检索谷歌路线的结构,现在你只能通过JSON或XML获得),现在是时候迁移你的代码了到JSON而不是KML.