AndroidでDirections APIを使用して複数の経路を表示する

Question

私はこのクラスを使って地図上に経路を表示しています。問題は、1つの経路しか表示しないことです。私がしたいことは、地図上に複数の代替ルートを表示することです。サーバーの応答に複数のルートがあるとはいえ、最初のルートのみを解析して表示します。 Googleサーバーが返すルートをすべて表示するにはどのような変更を行う必要がありますか？これは私のクラスです。

public class GMapV2Direction { 
    public final static String MODE_DRIVING = "driving"; 
    public final static String MODE = "walking"; 
    public final static String MODE_WALKING = "walking"; 

    public GMapV2Direction() { } 

    public Document getDocument(LatLng start, LatLng end, String mode) { 
     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="+MODE+"alternatives=true"; 

     try { 
      HttpClient httpClient = new DefaultHttpClient(); 
      HttpContext localContext = new BasicHttpContext(); 
      HttpPost httpPost = new HttpPost(url); 
      HttpResponse response = httpClient.execute(httpPost, localContext); 
      InputStream in = response.getEntity().getContent(); 
      DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); 
      Document doc = builder.parse(in); 
      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("EndAddress", 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; 
    } 
} 

Answer 1

私は、他のは賢明なあなたが使用したInputStream から文字列に変換することができ、あなたはGoogleのサーバーの応答を取得し、ドキュメントでそれを解析する必要はありませんと思う：

private String convertStreamToString(final InputStream input) throws Exception { 
    try { 
     final BufferedReader reader = new BufferedReader(new InputStreamReader(input)); 
     final StringBuffer sBuf = new StringBuffer(); 
     String line = null; 
     while ((line = reader.readLine()) != null) { 
      sBuf.append(line); 
     } 
     return sBuf.toString(); 
    } catch (Exception e) { 
     throw e; 
    } finally { 
     try { 
      input.close(); 
     } catch (Exception e) { 
      throw e; 
     } 
    } 

JSONObjectとしてレスポンスを解析する必要があります

JSONObject jSONObject = new JSONObject(string); 

その後、あなたが得るJSONArray今あなたがJSONArrayからそのインデックスを取得することにより、各ルートからデータをフェッチを開始することができルート

JSONArray routeJSONArray = jSONObject.getJSONArray("routes"); 

を命名。

iはRoute.java経路のモデルとして

をコードスニペットを書かれている

import java.io.Serializable; 
import java.util.ArrayList; 
import java.util.List; 

import android.content.Context; 

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

public class Route implements Serializable { 

    private static final long serialVersionUID = 1L; 
    private Bound bounds; 
    private String copyrights; 
    private List<Leg> legs; 
    private Polyline overviewPolyLine; 
    private String summary; 

    public Route(Context context) { 
     legs = new ArrayList<Leg>(); 
    } 

    public Bound getBounds() { 
     return bounds; 
    } 

    public void setBounds(Bound bounds) { 
     this.bounds = bounds; 
    } 

    public String getCopyrights() { 
     return copyrights; 
    } 

    public void setCopyrights(String copyrights) { 
     this.copyrights = copyrights; 
    } 

    public List<Leg> getLegs() { 
     return legs; 
    } 

    public void setLegs(List<Leg> legs) { 
     this.legs = legs; 
    } 

    public void addLeg(Leg leg) { 
     this.legs.add(leg); 
    } 

    public Polyline getOverviewPolyLine() { 
     return overviewPolyLine; 
    } 

    public void setOverviewPolyLine(Polyline overviewPolyLine) { 
     this.overviewPolyLine = overviewPolyLine; 
    } 

    public String getSummary() { 
     return summary; 
    } 

    public void setSummary(String summary) { 
     this.summary = summary; 
    } 

    public static long getSerialversionuid() { 
     return serialVersionUID; 
    } 

} 

Bound.java

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

public class Bound { 
    private LatLng northEast; 
    private LatLng southWest; 
    public LatLng getNorthEast() { 
     return northEast; 
    } 
    public void setNorthEast(LatLng northEast) { 
     this.northEast = northEast; 
    } 
    public LatLng getSouthWest() { 
     return southWest; 
    } 
    public void setSouthWest(LatLng southWest) { 
     this.southWest = southWest; 
    } 
} 

Leg.java

import java.util.ArrayList; 
import java.util.List; 

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

public class Leg { 
    private Distance distance; 
    private Duration duration; 
    private String endAddress; 
    private LatLng endLocation; 
    private String startAddress; 
    private LatLng startLocation; 
    private List<Step> steps; 

    public Leg() { 
     steps = new ArrayList<Step>(); 
    } 

    public Distance getDistance() { 
     return distance; 
    } 

    public void setDistance(Distance distance) { 
     this.distance = distance; 
    } 

    public Duration getDuration() { 
     return duration; 
    } 

    public void setDuration(Duration duration) { 
     this.duration = duration; 
    } 

    public String getEndAddress() { 
     return endAddress; 
    } 

    public void setEndAddress(String endAddress) { 
     this.endAddress = endAddress; 
    } 

    public LatLng getEndLocation() { 
     return endLocation; 
    } 

    public void setEndLocation(LatLng endLocation) { 
     this.endLocation = endLocation; 
    } 

    public String getStartAddress() { 
     return startAddress; 
    } 

    public void setStartAddress(String startAddress) { 
     this.startAddress = startAddress; 
    } 

    public LatLng getStartLocation() { 
     return startLocation; 
    } 

    public void setStartLocation(LatLng startLocation) { 
     this.startLocation = startLocation; 
    } 

    public List<Step> getSteps() { 
     return steps; 
    } 

    public void setSteps(List<Step> steps) { 
     this.steps = steps; 
    } 

    public void addStep(Step step) { 
     this.steps.add(step); 
    } 

} 

Distance.java

public class Distance { 
    private String text; 
    private long value; 

    public Distance(String text, long value) { 
     this.text = text; 
     this.value = value; 
    } 

    public String getText() { 
     return text; 
    } 

    public void setText(String text) { 
     this.text = text; 
    } 

    public long getValue() { 
     return value; 
    } 

    public void setValue(long value) { 
     this.value = value; 
    } 

} 

Duration.java

public class Duration { 
    public Duration(String text, long value) { 
     this.text = text; 
     this.value = value; 
    } 

    private String text; 
    private long value; 

    public String getText() { 
     return text; 
    } 

    public void setText(String text) { 
     this.text = text; 
    } 

    public long getValue() { 
     return value; 
    } 

    public void setValue(long value) { 
     this.value = value; 
    } 

} 

ステップ。Javaの

import java.util.List; 

import android.annotation.SuppressLint; 
import android.content.Context; 
import android.graphics.drawable.Drawable; 

import com.google.android.gms.maps.model.LatLng; 
import com.nweave.etaxi.driver.R; 

public class Step { 
    private Distance distance; 
    private Duration duration; 
    private LatLng endLocation; 
    private LatLng startLocation; 
    private String htmlInstructions; 
    private String travelMode; 
    private List<LatLng> points; 

    public List<LatLng> getPoints() { 
     return points; 
    } 

    public void setPoints(List<LatLng> points) { 
     this.points = points; 
    } 

    public Distance getDistance() { 
     return distance; 
    } 

    public void setDistance(Distance distance) { 
     this.distance = distance; 
    } 

    public Duration getDuration() { 
     return duration; 
    } 

    public void setDuration(Duration duration) { 
     this.duration = duration; 
    } 

    public LatLng getEndLocation() { 
     return endLocation; 
    } 

    public void setEndLocation(LatLng endLocation) { 
     this.endLocation = endLocation; 
    } 

    public LatLng getStartLocation() { 
     return startLocation; 
    } 

    public void setStartLocation(LatLng startLocation) { 
     this.startLocation = startLocation; 
    } 

    public String getHtmlInstructions() { 
     return htmlInstructions; 
    } 

    public void setHtmlInstructions(String htmlInstructions) { 
     this.htmlInstructions = htmlInstructions; 
    } 

    public String getTravelMode() { 
     return travelMode; 
    } 

    public void setTravelMode(String travelMode) { 
     this.travelMode = travelMode; 
    } 
} 

解析関数は、このフィールドに応じて、あなたのイメージを選択しますHTML命令と操縦と呼ばれる別のフィールドがありステップイメージについて

​​

になります

こちらがお役に立てば幸いです。）

Answer 2

私はjオブジェクトを解析するため

private class DownloadTask1 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); 

      ParserTask1 parserTask = new ParserTask1(); 

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


     private String getDirectionsUrl1(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&alternatives=true&units=metric&mode=driving"; 
      //&alternatives=true&units=metric&mode=driving 
      // 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; 
     } 
    } 

downloadUrl（）メソッド

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

ParserTask1クラス

private class ParserTask1 extends AsyncTask<String, Integer, List<List<List<HashMap<String, String>>>>> { 

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

      JSONObject jObject; 
      List<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<List<HashMap<String, String>>>> result) { 
      ArrayList<LatLng> points = null; 
      PolylineOptions lineOptions = new PolylineOptions(); 

      PolylineOptions lineOptions1 = null; 
      MarkerOptions markerOptions = new MarkerOptions(); 
      String distance = ""; 
      String duration = ""; 

      Integer size1 = 0; 
      Integer size2 = 0; 
      Integer size3 = 0; 
//   Log.d(SHETTY, "onPostExecute: result set "+result.size()); 


      List<LatLng> aline1 = new ArrayList<LatLng>(); 
      List<LatLng> aline2 = new ArrayList<LatLng>(); 
      List<LatLng> aline3 = new ArrayList<LatLng>(); 


      if (result != null) { 
       int i = 0; 
       Log.d(SHETTY, "onPostExecute: result size " + result.size()); 

       while (i < result.size()) { 

        // for(int i=0;i<result.size();i++){ 
        //result.size() 
        //int g= i-1; 
        points = new ArrayList<LatLng>(); 
        // lineOptions = new PolylineOptions(); 
        // if(i==1){ 

        // }else{ 
        List<List<HashMap<String, String>>> path1 = result.get(i); 

        for (int s = 0; s < path1.size(); s++) { 
         Log.d("pathsize1", path1.size() + ""); 

         // Fetching i-th route 
         List<HashMap<String, String>> path = path1.get(s); 
         Log.d("pathsize", path.size() + ""); 
         // Fetching all the points in i-th route 

         for (int j = 0; j < path.size(); j++) { 
          lineOptions1 = new PolylineOptions(); 
          HashMap<String, String> point = path.get(j); 
          // points = new ArrayList<LatLng>(); 
          //     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); 
          // Log.d("latlng", position.toString()); 
          points.add(position); 


         } 
         //    lineOptions.addAll(points); 
         //    lineOptions.width(5); 
         //    lineOptions.color(Color.BLUE); 
         //    map.addPolyline(lineOptions); 

        } 
        // } 
        if (i == 0) { 


//      line1.addAll(points); 
//      mMap.addPolyline(line1); 

         size1 = points.size(); 

         aline1.addAll(points); 
        } else if (i == 1) { 


//      line2.addAll(points); 
//      mMap.addPolyline(line2); 

         aline2.addAll(points); 
         size2 = points.size(); 
        } else if (i == 2) { 


//      line3.addAll(points); 
//      mMap.addPolyline(line3); 

         aline3.addAll(points); 
         size3 = points.size(); 
        } 
        // Adding all the points in the route to LineOptions 
        i++; 


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

      if (size3 != 0) 
      { 

       if ((size1 > size2 && size1 > size3)) { 
        if (size2 > size3) { 
         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 

         mMap.addPolyline(line1); 
         mMap.addPolyline(line2); 
         mMap.addPolyline(line3); 


         Log.d(SHETTY, "onPostExecute: 3110 "); 
        } else { 

         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 

         mMap.addPolyline(line1); 
         mMap.addPolyline(line3); 

         mMap.addPolyline(line2); 


         Log.d(SHETTY, "onPostExecute: 3127 "); 
        } 
       } else if ((size2 > size1 && size2 > size3)) { 
        if (size1 > size3) { 
         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 

         mMap.addPolyline(line1); 
         mMap.addPolyline(line2); 

         mMap.addPolyline(line3); 


         Log.d(SHETTY, "onPostExecute: 3147 "); 
        } else { 

         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 


         mMap.addPolyline(line2); 
         mMap.addPolyline(line3); 

         mMap.addPolyline(line1); 

         Log.d(SHETTY, "onPostExecute: 3164 "); 
        } 
       } else if ((size3 > size1 && size3 > size2)) { 
        if (size1 > size2) { 
         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 


         mMap.addPolyline(line3); 
         mMap.addPolyline(line1); 
         mMap.addPolyline(line2); 

         Log.d(SHETTY, "onPostExecute: 3182 "); 
        } else { 
         PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
         PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
         PolylineOptions line3 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 

         line1.addAll(aline1); 
         line2.addAll(aline2); 
         line3.addAll(aline3); 

         mMap.addPolyline(line3); 
         mMap.addPolyline(line2); 

         mMap.addPolyline(line1); 

         Log.d(SHETTY, "onPostExecute: 3196 "); 
        } 
       } else { 
        System.out.println("ERROR!"); 
       } 

     }else if(size2!=0) 
      { 
       if(size1>size2){ 

        PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 
        PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 


        line1.addAll(aline1); 
        line2.addAll(aline2); 

        mMap.addPolyline(line1); 
        mMap.addPolyline(line2); 

       }else 
       { 
        PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
        PolylineOptions line2 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.grey)); 

        line1.addAll(aline1); 
        line2.addAll(aline2); 

        mMap.addPolyline(line2); 
        mMap.addPolyline(line1); 
       } 



      } 
      else if(size1!=0){ 
       PolylineOptions line1 = new PolylineOptions().width(8).color(getActivity().getResources().getColor(R.color.lightblue)); 
       line1.addAll(aline1); 
       mMap.addPolyline(line1); 
      } 

     } 




     } 

今、あなたはこの

LatLng origin = sourcePosition; 
    LatLng dest = destPosition; 

    DownloadTask1 downloadTask = new DownloadTask1(); 
    String url = downloadTask.getDirectionsUrl1(origin, dest);     
    downloadTask.execute(url); 

DownloadTask1クラスのような何かを行うことができると思います終わりDirectionsJSONParserクラス

public class DirectionsJSONParser { 

    /** 
    * Receives a JSONObject and returns a list of lists containing latitude and 
    * longitude 
    */ 
    public List<List<List<HashMap<String,String>>>> parse(JSONObject jObject){ 

     List<List<HashMap<String, String>>> routes = new ArrayList<List<HashMap<String,String>>>() ; 
     List<List<List<HashMap<String,String>>>> routes1 = new ArrayList<List<List<HashMap<String,String>>>>() ; 
     JSONArray jRoutes = null; 
     JSONArray jLegs = null; 
     JSONArray jSteps = null; 

     try { 

      jRoutes = jObject.getJSONArray("routes"); 

      /** Traversing all routes */ 
      for(int i=0;i<jRoutes.length();i++){ 
       jLegs = ((JSONObject)jRoutes.get(i)).getJSONArray("legs"); 
       List path = new ArrayList<HashMap<String, String>>(); 
       List path1 = new ArrayList<ArrayList<HashMap<String,String>>>(); 

       // Log.d("legs",jLegs.toString()); 
       /** Traversing all legs */ 
       for(int j=0;j<jLegs.length();j++){ 
        HashMap<String, String> hm1 = new HashMap<String, String>(); 
        jSteps = ((JSONObject)jLegs.get(j)).getJSONArray("steps"); 
        // Log.d("steps",jSteps.toString()); 
        /** Traversing all steps */ 
        for(int k=0;k<jSteps.length();k++){ 

         String polyline = ""; 
         polyline = (String)((JSONObject)((JSONObject)jSteps.get(k)).get("polyline")).get("points"); 
         List<LatLng> list = decodePoly(polyline); 
         // Log.d("polyline",polyline.toString()); 
         /** Traversing all points */ 

         for(int l=0;l<list.size();l++){ 
          HashMap<String, String> hm = new HashMap<String, String>(); 
          hm.put("lat", Double.toString(((LatLng)list.get(l)).latitude)); 
          hm.put("lng", Double.toString(((LatLng)list.get(l)).longitude)); 

          path.add(hm); 
          // Log.d("lat", Double.toString(((LatLng)list.get(l)).latitude)); 
          // Log.d("lng", Double.toString(((LatLng)list.get(l)).longitude)); 
         } 

        } 

        path1.add(path); 

       } 
       routes1.add(path1); 
      } 

     } catch (JSONException e) { 
      e.printStackTrace(); 
     }catch (Exception e){ 
     } 

     return routes1; 
    } 
    /** 
    * Method to decode polyline points 
    * Courtesy : http://jeffreysambells.com/2010/05/27/decoding-polylines-from-google-maps-direction-api-with-java 
    * */ 
    private List<LatLng> decodePoly(String encoded) { 

     List<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 p = new LatLng((((double) lat/1E5)), 
        (((double) lng/1E5))); 
      poly.add(p); 
     } 

     return poly; 
    } 

} 

を作成するには、青色と灰色の中の選択肢の主なルートを持っています。それが役に立てば幸い。