在android中的两个位置之间的地图上查找路线

Question

我正在构建一个应用程序，我需要在2个位置之间的地图上找到路线。用户可以输入2个位置，即源和目的地，他可以获取路线在地图上。 有人可以告诉我如何继续dis.Is有一个教程，可以帮助我在这个？ Thanx提前。

Answer 1

在两个位置之间显示路线的方法很多。

1）打开默认的地图应用程序，并显示路线

String uri = "http://maps.google.com/maps?saddr=" + currentLatitude+","+currentLongitude+"&daddr="+fixedLatitude+","+fixedLongitude; 
Intent intent = new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(uri)); 
intent.setClassName("com.google.android.apps.maps", "com.google.android.maps.MapsActivity"); 
startActivity(intent); 

2）使用谷歌API和谷歌API

解析数据，这种方式，你必须遵循这个link

Answer 2

public class MappzzActivity extends MapActivity { 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mapp); 
    double src_lat = latPoint; 
    double src_long = lngPoint; 

    double dest_lat = 8.88056; 
    double dest_long = 76.5917; 
    GeoPoint srcGeoPoint = new GeoPoint((int) (src_lat * 1E6), 
      (int) (src_long * 1E6)); 
    GeoPoint destGeoPoint = new GeoPoint((int) (dest_lat * 1E6), 
      (int) (dest_long * 1E6)); 

    DrawPath(srcGeoPoint, destGeoPoint, Color.GREEN, mapView); 

    mapView.getController().animateTo(srcGeoPoint); 
    mapView.getController().setZoom(15); 

} 

@Override 
protected boolean isRouteDisplayed() { 
    // TODO Auto-generated method stub 
    return false; 
} 

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()); 

    // get the kml (XML) doc. And parse it to get the coordinates(direction 
    // route). 
    Document doc = null; 
    HttpURLConnection urlConnection = null; 
    URL url = null; 
    try { 
     url = new URL(urlString.toString()); 
     urlConnection = (HttpURLConnection) url.openConnection(); 
     urlConnection.setRequestMethod("GET"); 
     urlConnection.setDoOutput(true); 
     urlConnection.setDoInput(true); 
     urlConnection.connect(); 

     DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
     DocumentBuilder db = dbf.newDocumentBuilder(); 
     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 

      // src 
      GeoPoint startGP = new GeoPoint(
        (int) (Double.parseDouble(lngLat[1]) * 1E6), 
        (int) (Double.parseDouble(lngLat[0]) * 1E6)); 
      mMapView01.getOverlays() 
        .add(new MyOverLay(startGP, startGP, 1)); 

      GeoPoint gp1; 
      GeoPoint gp2 = startGP; 
      for (int i = 1; i < pairs.length; i++) { 
       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)); 
       mMapView01.getOverlays().add(
         new MyOverLay(gp1, gp2, 2, color)); 

       Log.d("xxx", "pair:" + pairs[i]); 

      } 
      mMapView01.getOverlays().add(new MyOverLay(dest, dest, 3)); 

     } 
    } catch (MalformedURLException e) { 

     e.printStackTrace(); 
    } catch (IOException e) { 

     e.printStackTrace(); 
    } catch (ParserConfigurationException e) { 

     e.printStackTrace(); 

    } catch (SAXException e) { 

     e.printStackTrace(); 
    } 

} 
}