Driving route from my location to destination in Google Maps Android API V2

Step 1 :- Create New Android Project.



Step 2 :- Add Google-play-services_lib to your project.

Step 3 :- Open AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mapv2.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
   
    <uses-permission android:name="android.permission.INTERNET"/>

    <permission
          android:name="com.mapv2.demo.permission.MAPS_RECEIVE"
          android:protectionLevel="signature" />

    <uses-permission android:name="com.mapv2.demo.permission.MAPS_RECEIVE" />

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>   

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.mapv2.demo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyCmX7SLVHXxU9pSqb2QbAOvdnjAGUulOrk"/>
       
       
       
    </application>

</manifest>

Step 4 :- Open activity_main.xml.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"   
    tools:context=".MainActivity" >

    <fragment
        android:id="@+id/map"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"       
        class="com.google.android.gms.maps.SupportMapFragment" />

</RelativeLayout>

Step 5 :- Open MainActivity.java

package com.mapv2.demo;

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 android.app.Dialog;
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.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.Menu;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
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.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;


public class MainActivity extends FragmentActivity implements LocationListener {

    GoogleMap mGoogleMap;
    ArrayList<LatLng> mMarkerPoints;
    double mLatitude=0;
    double mLongitude=0;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        // Getting Google Play availability status
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());

        if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available

            int requestCode = 10;
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
            dialog.show();

        }else { // Google Play Services are available
       
            // Initializing
            mMarkerPoints = new ArrayList<LatLng>();
           
            // Getting reference to SupportMapFragment of the activity_main
            SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
           
            // Getting Map for the SupportMapFragment
            mGoogleMap = fm.getMap();
           
            // Enable MyLocation Button in the Map
            mGoogleMap.setMyLocationEnabled(true);
           
           
            // Getting LocationManager object from System Service LOCATION_SERVICE
            LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
   
            // Creating a criteria object to retrieve provider
            Criteria criteria = new Criteria();
   
            // Getting the name of the best provider
            String provider = locationManager.getBestProvider(criteria, true);
   
            // Getting Current Location From GPS
            Location location = locationManager.getLastKnownLocation(provider);
           
            if(location!=null){
                onLocationChanged(location);
            }

            locationManager.requestLocationUpdates(provider, 20000, 0, this);           
           
            // Setting onclick event listener for the map
            mGoogleMap.setOnMapClickListener(new OnMapClickListener() {
               
                @Override
                public void onMapClick(LatLng point) {
                   
                    // Already map contain destination location   
                    if(mMarkerPoints.size()>1){
                       
                        FragmentManager fm = getSupportFragmentManager();   
                        mMarkerPoints.clear();
                        mGoogleMap.clear();
                        LatLng startPoint = new LatLng(mLatitude, mLongitude);
                        drawMarker(startPoint);
                    }
                   
                    drawMarker(point);
                   
                    // Checks, whether start and end locations are captured
                    if(mMarkerPoints.size() >= 2){                   
                        LatLng origin = mMarkerPoints.get(0);
                        LatLng dest = mMarkerPoints.get(1);
                       
                        // 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;
     }

   
   
    /** A class to download data from Google Directions URL */
    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 Directions 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;
           
            // 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
            mGoogleMap.addPolyline(lineOptions);                           
        }           
    }  
   
   
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
   
    private void drawMarker(LatLng point){
        mMarkerPoints.add(point);
       
        // Creating MarkerOptions
        MarkerOptions options = new MarkerOptions();
       
        // Setting the position of the marker
        options.position(point);
       
        /**
         * For the start location, the color of marker is GREEN and
         * for the end location, the color of marker is RED.
         */
        if(mMarkerPoints.size()==1){
            options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
        }else if(mMarkerPoints.size()==2){
            options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
        }
       
        // Add new marker to the Google Map Android API V2
        mGoogleMap.addMarker(options);       
    }

    @Override
    public void onLocationChanged(Location location) {
        // Draw the marker, if destination location is not set
        if(mMarkerPoints.size() < 2){
           
            mLatitude = location.getLatitude();
            mLongitude = location.getLongitude();
            LatLng point = new LatLng(mLatitude, mLongitude);
   
            mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(point));
            mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(12));       
       
            drawMarker(point);           
        }
       
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub       
    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub       
    }

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



1.) DirectionsJSONParser.java

package com.mapv2.demo;

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;
    }
}

Step 6 :- Run Code.

Step 7 :- Download Code :- https://dl.dropboxusercontent.com/u/109954727/Map/map16.zip