android url to access KML route

问题

I am trying to draw path between two points on google map using url below,

http://maps.google.com/maps?f=d&hl=en&saddr=13.005621,77.577531&daddr=13.005621,77.579531&ie=UTF8&0&om=0&output=kml

before it was working properly, but now it shows exception,

 I/System.out(461): Unexpected end of document

doc is returning null why? my code is bellow,

http://pastebin.com/XvR0rYdQ

thank you

回答1:

These links help u to code for maps:

MAPS Tutor
Maps Location
Maps Api

If u want url only then use this :
http://code.google.com/apis/kml/

These Is complete source code for maps location .

Android

Android G1 screenshot http://img249.imageshack.us/img249/3336/androidmaproute.jpg

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<Overlay> 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;
 }
}

See full code on J2MEMapRouteAndroidEx on Google Code

来源：https://stackoverflow.com/questions/8612524/android-url-to-access-kml-route