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Android Googleマップ上のマーカー間のルートを表示する方法

ユーザーの位置を表示し、その位置にマーカーを配置するアプリを作成しています。ユーザーが移動した後。マーカーが削除され、新しいマーカーが作成されます。今。ポイントAとポイントBにマーカーを作成してアプリにハードコーディングし、地図にルートを表示したいと思います。地図上の最も近い道路を使用するものとします。私はいくつかの調査を行いましたが、5年前の古いコードのみを見つけました。誰もがこれを私に導くのに十分親切でしたか？.

ポイントAとポイントBはLocationChangedメソッド上にあります。

import com.google.Android.gms.maps.CameraUpdateFactory;
import com.google.Android.gms.maps.GoogleMap;
import com.google.Android.gms.maps.SupportMapFragment;

import com.google.Android.gms.maps.model.BitmapDescriptorFactory;
import com.google.Android.gms.maps.model.LatLng;
import com.google.Android.gms.maps.model.Marker;
import com.google.Android.gms.maps.model.MarkerOptions;

import Android.content.Context;
import Android.content.Intent;
import Android.location.Criteria;
import Android.location.Location;
import Android.location.LocationListener;
import Android.location.LocationManager;
import Android.os.Bundle;
import Android.provider.Settings;
import Android.support.v4.app.FragmentActivity;
import Android.widget.Toast;

public class MainActivity extends FragmentActivity implements LocationListener {
    private GoogleMap map;
    private LocationManager locationManager;
    private String provider;
    LatLng coordinate;
    Marker startPerc;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
        boolean enabledGPS = service
                .isProviderEnabled(LocationManager.GPS_PROVIDER);
        boolean enabledWiFi = service
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        // Check if enabled and if not send user to the GSP settings
        // Better solution would be to display a dialog and suggesting to 
        // go to the settings
        if (!enabledGPS) {
            Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(intent);
        }
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    // Define the criteria how to select the location provider -> use
    // default
    Criteria criteria = new Criteria();
    provider = locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);

    // Initialize the location fields
    if (location != null) {
        Toast.makeText(this, "Selected Provider " + provider,
                Toast.LENGTH_SHORT).show();
        onLocationChanged(location);
    } else {

        //do something
    }


}

/* Request updates at startup */
@Override
protected void onResume() {
    super.onResume();
    locationManager.requestLocationUpdates(provider, 300, 1, this);
}

/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
    super.onPause();
    locationManager.removeUpdates(this);
}

@Override
public void onLocationChanged(Location location) {

    double lat =  location.getLatitude();
    double lng = location.getLongitude();
    Toast.makeText(this, "Location " + lat+","+lng,
            Toast.LENGTH_LONG).show();
    LatLng coordinate = new LatLng(lat, lng);
    Toast.makeText(this, "Location " + coordinate.latitude+","+coordinate.longitude,
            Toast.LENGTH_LONG).show();
    if(map!=null){
        map.clear();
    }
    //map.clear();
    GoogleMap map;
    if(startPerc!=null){
        startPerc.remove();
    }
    map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
    startPerc = map.addMarker(new MarkerOptions()
    .position(coordinate)
      .title("Start")
      .snippet("Your Position")
      .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)));
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 20));



    map.addMarker(new MarkerOptions()
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_Azure))
                    .position(new LatLng(3.214732, 101.747047))
                    .title("Point A")
                    .snippet("Bus Stop")
                    .flat(true));

    map.addMarker(new MarkerOptions()
                    .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_Azure))
                    .position(new LatLng(3.214507, 101.749697))
                    .title("Point B")
                    .snippet("Bus Stop")
                    .flat(true));



startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher));

}


@ Override
public void onProviderDisabled(String provider) {
    Toast.makeText(this, "Enabled new provider " + provider,
            Toast.LENGTH_SHORT).show();

}


@Override
public void onProviderEnabled(String provider) {
    Toast.makeText(this, "Disabled provider " + provider,
            Toast.LENGTH_SHORT).show();

}


@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}
void Delay(int Seconds){
    long Time = 0;
    Time = System.currentTimeMillis();
    while(System.currentTimeMillis() < Time+(Seconds*1000));
}
}

K Neerajが提供する新しいコード。残念ながらまだクラッシュします。確認してください。

import Java.io.BufferedReader;
import Java.io.IOException;
import Java.io.InputStream;
import Java.io.InputStreamReader;
import Java.net.HttpURLConnection;
import Java.net.URL;
import Java.util.ArrayList;
import Java.util.HashMap;
import Java.util.List;

import org.json.JSONObject;

import com.google.Android.gms.maps.CameraUpdateFactory;
import com.google.Android.gms.maps.GoogleMap;
import com.google.Android.gms.maps.OnMapReadyCallback;
import com.google.Android.gms.maps.SupportMapFragment;

import com.google.Android.gms.maps.model.BitmapDescriptorFactory;
import com.google.Android.gms.maps.model.LatLng;
import com.google.Android.gms.maps.model.Marker;
import com.google.Android.gms.maps.model.MarkerOptions;
import com.google.Android.gms.maps.model.PolylineOptions;

import Android.content.Context;
import Android.content.Intent;
import Android.graphics.Color;
import Android.location.Criteria;
import Android.location.Location;
import Android.location.LocationListener;
import Android.location.LocationManager;
import Android.os.AsyncTask;
import Android.os.Bundle;
import Android.provider.Settings;
import Android.support.v4.app.FragmentActivity;
import Android.util.Log;
import Android.widget.Toast;

public class MainActivity extends FragmentActivity implements LocationListener {
    private GoogleMap map;
    private LocationManager locationManager;
    private String provider;
    LatLng coordinate;
    Marker startPerc;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
        boolean enabledGPS = service
                .isProviderEnabled(LocationManager.GPS_PROVIDER);
        boolean enabledWiFi = service
                .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        // Check if enabled and if not send user to the GSP settings
        // Better solution would be to display a dialog and suggesting to 
        // go to the settings
        if (!enabledGPS) {
            Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(intent);
        }

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        // Define the criteria how to select the location provider -> use
        // default
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        Location location = locationManager.getLastKnownLocation(provider);



        // Initialize the location fields
        if (location != null) {
            Toast.makeText(this, "Selected Provider " + provider,
                    Toast.LENGTH_SHORT).show(); 
            onLocationChanged(location);
        } else {

        //do something
    }


}


/* Request updates at startup */
@Override
protected void onResume() {
    super.onResume();
    locationManager.requestLocationUpdates(provider, 300, 1, this);
}

/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause() {
    super.onPause();
    locationManager.removeUpdates(this);
}

@Override
public void onLocationChanged(Location location) {

    double lat =  location.getLatitude();
    double lng = location.getLongitude();
    Toast.makeText(this, "Location " + lat+","+lng,
            Toast.LENGTH_LONG).show();
    LatLng coordinate = new LatLng(lat, lng);
    Toast.makeText(this, "Location " + coordinate.latitude+","+coordinate.longitude,
            Toast.LENGTH_LONG).show();



    if(map!=null){
        map.clear();
    }

    GoogleMap map;
    if(startPerc!=null){
        startPerc.remove();
    }
    map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
    startPerc = map.addMarker(new MarkerOptions()
    .position(coordinate)
      .title("Start")
      .snippet("Your Position")
      .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)));
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 12));




    startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher));

 // Assign your Origin and destination
 // These points are your markers coordinates
 LatLng Origin = new LatLng(3.214732, 101.747047);
 LatLng dest = new LatLng(3.214507, 101.749697);

 // Getting URL to the Google Directions API
 String url = getDirectionsUrl(Origin, dest);

 DownloadTask downloadTask = new DownloadTask();

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


 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();

         // 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);

                 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(2);
             lineOptions.color(Color.RED);
         }

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




@ Override
public void onProviderDisabled(String provider) {
    Toast.makeText(this, "Enabled new provider " + provider,
            Toast.LENGTH_SHORT).show();

}


@Override
public void onProviderEnabled(String provider) {
    Toast.makeText(this, "Disabled provider " + provider,
            Toast.LENGTH_SHORT).show();

}


@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}
void Delay(int Seconds){
    long Time = 0;
    Time = System.currentTimeMillis();
    while(System.currentTimeMillis() < Time+(Seconds*1000));
}
}

次に、新しいDirectionJSONParser.Javaを作成しました

import Java.util.ArrayList;
import Java.util.HashMap;
import Java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

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

public class DirectionsJSONParser {

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

        List<List<HashMap<String, String>>> routes = new ArrayList<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>>();

                /** Traversing all legs */
                for(int j=0;j<jLegs.length();j++){
                    jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps");

                    /** 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);

                    /** 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);
                    }
                }
            routes.add(path);
        }
    }

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

return routes;
}
/**
* 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;
}
}
androidgoogle-mapsroutes
11
fuzzy wuzzy
@Override
public void onLocationChanged(Location location) {
....
 startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher));

// Assign your Origin and destination
// These points are your markers coordinates
LatLng Origin = new LatLng(3.214732, 101.747047);
LatLng dest = new LatLng(3.214507, 101.749697);

// Getting URL to the Google Directions API
String url = getDirectionsUrl(Origin, dest);

DownloadTask downloadTask = new DownloadTask();

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


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();

        // 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);

                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(2);
            lineOptions.color(Color.RED);
        }

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

このチュートリアルをご覧ください。

GoogleマップでGoogleルートを使用して2つの場所間の運転ルートルートを描画するAndroid Api v2

2つのポイント間でルートマップを描画する方法を示します。

20
K Neeraj Lal

以下に、マイナーな調整を加えた完全なコードを示します。それはただきれいです。

import Android.app.Activity;
import Android.os.AsyncTask;
import Android.util.Log;

import com.eddress.R;
import com.google.Android.gms.maps.GoogleMap;
import com.google.Android.gms.maps.model.LatLng;
import com.google.Android.gms.maps.model.PolylineOptions;

import org.json.JSONObject;

import Java.io.BufferedReader;
import Java.io.IOException;
import Java.io.InputStream;
import Java.io.InputStreamReader;
import Java.net.HttpURLConnection;
import Java.net.URL;
import Java.util.ArrayList;
import Java.util.HashMap;
import Java.util.List;

public class GoogleMapsPath {

    public GoogleMap map;

    public GoogleMapsPath(Activity context, GoogleMap map, LatLng Origin, LatLng dest){
        this.map = map;

        String url = getDirectionsUrl(Origin,dest);
        FetchUrl FetchUrl = new FetchUrl();
        FetchUrl.execute(url);

    }

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

        @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]);
                Log.d("Background Task data", data.toString());
            } catch (Exception e) {
                Log.d("Background Task", e.toString());
            }
            return data;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            ParserTask parserTask = new ParserTask();

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

        }
    }


    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();
            Log.d("downloadUrl", data.toString());
            br.close();

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


    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;
    }


    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]);
                Log.d("ParserTask",jsonData[0].toString());
                DirectionsJSONParser parser = new DirectionsJSONParser();
                Log.d("ParserTask", parser.toString());

                // Starts parsing data
                routes = parser.parse(jObject);
                Log.d("ParserTask","Executing routes");
                Log.d("ParserTask",routes.toString());

            } catch (Exception e) {
                Log.d("ParserTask",e.toString());
                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;
            PolylineOptions lineOptions = null;

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

                    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(8);
                lineOptions.color(R.color.globalRedLight);

                Log.d("onPostExecute","onPostExecute lineoptions decoded");

            }

            // Drawing polyline in the Google Map for the i-th route
            if(lineOptions != null) {
                map.addPolyline(lineOptions);
            }
            else {
                Log.d("onPostExecute","without Polylines drawn");
            }
        }
    }
}
3
Ronny Shibley