通过让我点到目的地的路线绘制(Draw route by getting my point to d

  String uri = "http://maps.google.com/maps?saddr=" + src_lat+","+src_lon+"&daddr="+des_lat1+","+des_lon1;
   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);

下面是用于绘制其中两个源和目的地的纬度和经度是已知的两个位置之间的路线的代码。但在这里我想取代我的位置的经度和纬度src_lon和src_lat ，其值我不知道，这经度和纬度与我目前的位置改变。是否可以得出这样一个类型的路由？

Answer 1:

试试这个：

Intent i = new Intent(android.content.Intent.ACTION_VIEW,
       Uri.parse("google.navigation:q=" +destLat+ ","+destLon+""));
this.startActivity(i);

这是最好的，我知道了解决方案。

Answer 2:

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

    // Connect to the 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());

    //System.out.println(urlString);
    // Get the KML (XML) document. 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().getNodeName();
            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
            // Source
            GeoPoint startGP = new GeoPoint((int)(
                Double.parseDouble(lngLat[1])*1E6),
                (int)(Double.parseDouble(lngLat[0])*1E6));
            //mMapView01.getOverlays().add(overlayitem);
            GeoPoint gp1;
            GeoPoint gp2 = startGP;
            for(int i=1; i<pairs.length; i++) // The last one would 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));
                mMapView01.getOverlays().add(new MapRouteOverlay(gp1,gp2,2,color));
                Log.d("xxx","pair:" + pairs[i]);
            }
            //mMapView01.getOverlays().add(new MapRouteOverlay(dest,dest, 3)); // Use the default color
        }
    }
    catch (MalformedURLException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    catch (ParserConfigurationException e)
    {
        e.printStackTrace();
    }
    catch (SAXException e)
    {
        e.printStackTrace();
    }
}

Answer 3:

是的，使用位置管理器来获取当前位置的经度和纬度。见定位策略 ，并一起去的谷歌地图API的路线。