ничья дорога между двумя точками в Google Map v2 андроида

Question

я пытаюсь нарисовать дороги/пути между двумя месте, что я предоставить свой код в настоящее время ищет, как это:

map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); 

LatLng lt = new LatLng(35.7687310, -5.8280540); 
map.addMarker(new MarkerOptions().position(lt).title("Home")); 
LatLng lt2 = new LatLng(35.7462510, -5.8481330); 
map.addMarker(new MarkerOptions().position(lt2).title("School")); 

мне нужно нарисовать дорогу направление между двумя маркерами, благодаря я уже искал решения, но большинство из них стары & не может запустить их, как они терпят крах ... я надеюсь, что вы могли бы помочь, спасибо

EDIT: мой Основная проблема заключалась в том, что я пытался использовать свой API на другом проекте, который не содержит такое же имя пакета, спасибо за помощь, ребята;)

Answer 1

Try this one: 


     if (googleMap == null) { 
      googleMap = ((MapFragment)getFragmentManager().findFragmentById(
        R.id.map_rideshare)).getMap(); 

      googleMap.clear(); 
      googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL); 


      v2GetRouteDirection = new GMapV2GetRouteDirection(); 


      String url = getDirectionsUrl(new LatLng(source_lat,source_long), new LatLng(destination_lat,destination_long)); 
      DownloadTask downloadTask = new DownloadTask(); 

      // Start downloading json data from Google Directions API 
      downloadTask.execute(url); 

      // check if map is created successfully or not 
      if (googleMap == null) { 
       Toast.makeText(Ride_Share.this, 
         "Sorry! unable to create maps", Toast.LENGTH_SHORT) 
         .show(); 
      } 
     } 



     private String getDirectionsUrl(LatLng origin,LatLng dest){ 

     // Origin of route 
     String str_origin = "origin="+origin.latitude+","+origin.longitude; 

     // Destination of route 
     String str_dest = "destination="+dest.latitude+","+dest.longitude; 

     // Sensor enabled 
     String sensor = "sensor=false"; 

     // Building the parameters to the web service 
     String parameters = str_origin+"&"+str_dest+"&"+sensor; 

     // Output format 
     String output = "json"; 

     // Building the url to the web service 
     String url = "https://maps.googleapis.com/maps/api/directions/"+output+"?"+parameters; 

     return url; 
    } 


    /** A method to download json data from url */ 
    private String downloadUrl(String strUrl) throws IOException{ 
     String data = ""; 
     InputStream iStream = null; 
     HttpURLConnection urlConnection = null; 
     try{ 
      URL url = new URL(strUrl); 

      // Creating an http connection to communicate with url 
      urlConnection = (HttpURLConnection) url.openConnection(); 

      // Connecting to url 
      urlConnection.connect(); 

      // Reading data from url 
      iStream = urlConnection.getInputStream(); 

      BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); 

      StringBuffer sb = new StringBuffer(); 

      String line = ""; 
      while((line = br.readLine()) != null){ 
       sb.append(line); 
      } 

      data = sb.toString(); 

      br.close(); 

     }catch(Exception e){ 
      Log.d("Exception while downloading url", e.toString()); 
     }finally{ 
      iStream.close(); 
      urlConnection.disconnect(); 
     } 
     return data; 
    } 

    // Fetches data from url passed 
    private class DownloadTask extends AsyncTask<String, Void, String>{ 

     // Downloading data in non-ui thread 
     @Override 
     protected String doInBackground(String... url) { 

      // For storing data from web service 
      String data = ""; 

      try{ 
       // Fetching the data from web service 
       data = downloadUrl(url[0]); 
      }catch(Exception e){ 
       Log.d("Background Task",e.toString()); 
      } 
      return data; 
     } 

     // Executes in UI thread, after the execution of 
     // doInBackground() 
     @Override 
     protected void onPostExecute(String result) { 
      super.onPostExecute(result); 

      ParserTask parserTask = new ParserTask(); 

      // Invokes the thread for parsing the JSON data 
      parserTask.execute(result); 
     } 
    } 

    /** A class to parse the Google Places in JSON format */ 
    private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap<String,String>>> >{ 

     // Parsing the data in non-ui thread 
     @Override 
     protected List<List<HashMap<String, String>>> doInBackground(String... jsonData) { 

      JSONObject jObject; 
      List<List<HashMap<String, String>>> routes = null; 

      try{ 
       jObject = new JSONObject(jsonData[0]); 
       DirectionsJSONParser parser = new DirectionsJSONParser(); 

       // Starts parsing data 
       routes = parser.parse(jObject); 
      }catch(Exception e){ 
       e.printStackTrace(); 
      } 
      return routes; 
     } 

     // Executes in UI thread, after the parsing process 
     @Override 
     protected void onPostExecute(List<List<HashMap<String, String>>> result) { 
      ArrayList<LatLng> points = null; 
      PolylineOptions lineOptions = null; 
      MarkerOptions markerOptions = new MarkerOptions(); 
      String distance = ""; 
      String duration = ""; 

      if(result.size()<1){ 
       //Toast.makeText(getBaseContext(), "No Points", Toast.LENGTH_SHORT).show(); 
       return; 
      } 

      // Traversing through all the routes 
      for(int i=0;i<result.size();i++){ 
       points = new ArrayList<LatLng>(); 
       lineOptions = new PolylineOptions(); 

       // Fetching i-th route 
       List<HashMap<String, String>> path = result.get(i); 

       // Fetching all the points in i-th route 
       for(int j=0;j<path.size();j++){ 
        HashMap<String,String> point = path.get(j); 

        if(j==0){ // Get distance from the list 
         distance = (String)point.get("distance"); 
         continue; 
        }else if(j==1){ // Get duration from the list 
         duration = (String)point.get("duration"); 
         continue; 
        } 

        double lat = Double.parseDouble(point.get("lat")); 
        double lng = Double.parseDouble(point.get("lng")); 
        LatLng position = new LatLng(lat, lng); 

        points.add(position); 
       } 

       // Adding all the points in the route to LineOptions 
       lineOptions.addAll(points); 
       lineOptions.width(4); 
       lineOptions.color(Color.GRAY); 
      } 

      //tvDistanceDuration.setText("Distance:"+distance + ", Duration:"+duration); 

      // Drawing polyline in the Google Map for the i-th route 
      googleMap.addPolyline(lineOptions); 
     } 
    } 

Добавить этот класс

import java.io.InputStream; 
import java.util.ArrayList; 

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 

import org.apache.http.HttpResponse; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.protocol.BasicHttpContext; 
import org.apache.http.protocol.HttpContext; 
import org.w3c.dom.Document; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 

import android.util.Log; 

import com.google.android.gms.maps.model.LatLng; 

public class GMapV2GetRouteDirection { 

    public final static String MODE_DRIVING = "driving"; 
    public final static String MODE_WALKING = "walking"; 

    public GMapV2GetRouteDirection() { } 

    public Document getDocument(LatLng start, LatLng end, String mode) { 
     Log.i("GMAP", "step2"); 
     String url = "http://maps.googleapis.com/maps/api/directions/xml?" 
       + "origin=" + start.latitude + "," + start.longitude 
       + "&destination=" + end.latitude + "," + end.longitude 
       + "&sensor=false&units=metric&mode=driving"; 

     Log.i("url", url); 
     Log.i("GMAP", "step3"); 
     try { 
      Log.i("GMAP", "step4"); 
      HttpClient httpClient = new DefaultHttpClient(); 
      Log.i("GMAP", "step5"); 
      HttpContext localContext = new BasicHttpContext(); 
      Log.i("GMAP", "step6"); 
      HttpPost httpPost = new HttpPost(url); 
      Log.i("GMAP", "step7"); 
      HttpResponse response = httpClient.execute(httpPost, localContext); 
      Log.i("GMAP", "step8"); 
      InputStream in = response.getEntity().getContent(); 
      Log.i("GMAP", "step9"); 
      DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); 
      Log.i("GMAP", "step10"); 
      Document doc = builder.parse(in); 
      Log.i("GMAP", "step11"); 

      return doc; 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    public String getDurationText (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("duration"); 
     Node node1 = nl1.item(0); 
     NodeList nl2 = node1.getChildNodes(); 
     Node node2 = nl2.item(getNodeIndex(nl2, "text")); 
     Log.i("DurationText", node2.getTextContent()); 
     return node2.getTextContent(); 
    } 

    public int getDurationValue (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("duration"); 
     Node node1 = nl1.item(0); 
     NodeList nl2 = node1.getChildNodes(); 
     Node node2 = nl2.item(getNodeIndex(nl2, "value")); 
     Log.i("DurationValue", node2.getTextContent()); 
     return Integer.parseInt(node2.getTextContent()); 
    } 

    public String getDistanceText (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("distance"); 
     Node node1 = nl1.item(0); 
     NodeList nl2 = node1.getChildNodes(); 
     Node node2 = nl2.item(getNodeIndex(nl2, "text")); 
     Log.i("DistanceText", node2.getTextContent()); 
     return node2.getTextContent(); 
    } 

    public int getDistanceValue (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("distance"); 
     Node node1 = nl1.item(0); 
     NodeList nl2 = node1.getChildNodes(); 
     Node node2 = nl2.item(getNodeIndex(nl2, "value")); 
     Log.i("DistanceValue", node2.getTextContent()); 
     return Integer.parseInt(node2.getTextContent()); 
    } 

    public String getStartAddress (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("start_address"); 
     Node node1 = nl1.item(0); 
     Log.i("StartAddress", node1.getTextContent()); 
     return node1.getTextContent(); 
    } 

    public String getEndAddress (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("end_address"); 
     Node node1 = nl1.item(0); 
     Log.i("StartAddress", node1.getTextContent()); 
     return node1.getTextContent(); 
    } 

    public String getCopyRights (Document doc) { 
     NodeList nl1 = doc.getElementsByTagName("copyrights"); 
     Node node1 = nl1.item(0); 
     Log.i("CopyRights", node1.getTextContent()); 
     return node1.getTextContent(); 
    } 

    public ArrayList<LatLng> getDirection (Document doc) { 
     NodeList nl1, nl2, nl3; 
     ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>(); 
     nl1 = doc.getElementsByTagName("step"); 
     if (nl1.getLength() > 0) { 
      for (int i = 0; i < nl1.getLength(); i++) { 
       Node node1 = nl1.item(i); 
       nl2 = node1.getChildNodes(); 

       Node locationNode = nl2.item(getNodeIndex(nl2, "start_location")); 
       nl3 = locationNode.getChildNodes(); 
       Node latNode = nl3.item(getNodeIndex(nl3, "lat")); 
       double lat = Double.parseDouble(latNode.getTextContent()); 
       Node lngNode = nl3.item(getNodeIndex(nl3, "lng")); 
       double lng = Double.parseDouble(lngNode.getTextContent()); 
       listGeopoints.add(new LatLng(lat, lng)); 

       locationNode = nl2.item(getNodeIndex(nl2, "polyline")); 
       nl3 = locationNode.getChildNodes(); 
       latNode = nl3.item(getNodeIndex(nl3, "points")); 
       ArrayList<LatLng> arr = decodePoly(latNode.getTextContent()); 
       for(int j = 0 ; j < arr.size() ; j++) { 
        listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude)); 
       } 

       locationNode = nl2.item(getNodeIndex(nl2, "end_location")); 
       nl3 = locationNode.getChildNodes(); 
       latNode = nl3.item(getNodeIndex(nl3, "lat")); 
       lat = Double.parseDouble(latNode.getTextContent()); 
       lngNode = nl3.item(getNodeIndex(nl3, "lng")); 
       lng = Double.parseDouble(lngNode.getTextContent()); 
       listGeopoints.add(new LatLng(lat, lng)); 
      } 
     } 

     return listGeopoints; 
    } 

    private int getNodeIndex(NodeList nl, String nodename) { 
     for(int i = 0 ; i < nl.getLength() ; i++) { 
      if(nl.item(i).getNodeName().equals(nodename)) 
       return i; 
     } 
     return -1; 
    } 

    private ArrayList<LatLng> decodePoly(String encoded) { 
     ArrayList<LatLng> poly = new ArrayList<LatLng>(); 
     int index = 0, len = encoded.length(); 
     int lat = 0, lng = 0; 
     while (index < len) { 
      int b, shift = 0, result = 0; 
      do { 
       b = encoded.charAt(index++) - 63; 
       result |= (b & 0x1f) << shift; 
       shift += 5; 
      } while (b >= 0x20); 
      int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); 
      lat += dlat; 
      shift = 0; 
      result = 0; 
      do { 
       b = encoded.charAt(index++) - 63; 
       result |= (b & 0x1f) << shift; 
       shift += 5; 
      } while (b >= 0x20); 
      int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); 
      lng += dlng; 

      LatLng position = new LatLng((double) lat/1E5, (double) lng/1E5); 
      poly.add(position); 
     } 
     return poly; 
    } 
}