Draw Route on MapV2

Create class GMapV2Direction.java

package com.exampledrawrouteonmap.act;

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 GMapV2Direction {

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

public GMapV2Direction() { }

public Document getDocument(LatLng start, LatLng end, String mode) {

//Implement THREADING concept here  ###

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";

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("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;
}

}


then this is the MainActivity.java

package com.exampledrawrouteonmap.act;

import java.util.ArrayList;

import org.w3c.dom.Document;

import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

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

public class MainActivity extends FragmentActivity {

private static final String TAG ="MainActivity";
GoogleMap mMap;
GMapV2Direction md;

/*LatLng fromPosition = new LatLng(12.914788 , 77.610106);
LatLng toPosition = new LatLng(12.94231 , 77.59739); */

LatLng fromPosition = new LatLng(23.037446,72.566325);
LatLng toPosition = new LatLng(23.054590 , 72.519743); 

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

md = new GMapV2Direction();
mMap = ((SupportMapFragment)getSupportFragmentManager()
.findFragmentById(R.id.the_map)).getMap();

// LatLng coordinates = new LatLng(12.914788 , 77.610106);
LatLng coordinates = new LatLng(23.037446,72.566325);

mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.getUiSettings().setAllGesturesEnabled(true);
mMap.setTrafficEnabled(true);
mMap.animateCamera(CameraUpdateFactory.zoomTo(12));
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinates, 16));

mMap.addMarker(new MarkerOptions().position(fromPosition).title("Start"));
mMap.addMarker(new MarkerOptions().position(toPosition).title("End"));

new showRoute().execute();
}

@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 class showRoute extends AsyncTask<Void, Void, Document>{

Document doc;
PolylineOptions rectLine;

@Override
protected Document doInBackground(Void... params) {

doc = md.getDocument(fromPosition, toPosition, GMapV2Direction.MODE_DRIVING);

ArrayList<LatLng> directionPoint = md.getDirection(doc);
rectLine = new PolylineOptions().width(3).color(Color.RED);

for(int i = 0 ; i < directionPoint.size() ; i++) {
           rectLine.add(directionPoint.get(i));
}

return null;
}

@Override
protected void onPostExecute(Document result) {

mMap.addPolyline(rectLine);
}

}

}

And last here is my manifest.xml file

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    
    <permission android:name="com.prabhakar.permission.MAPS_RECEIVE"
         android:protectionLevel="signature"/>

    <uses-permission android:name="com.prabhakar.permission.MAPS_RECEIVE" />    
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <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=".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>
        
       <!-- to get this API go to https://code.google.com/apis/console/ 
       and create api for this pacakge from SHA1 key
       Release key :- AIzaSyAATtJF2N3Hk5o_-QkDfq9sfi10sau4_Ys
        Debug key :- AIzaSyAfxRwKM9g3TnOk6rsJtAvO8qdz6bqY2z4
        --> 
           <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyAfxRwKM9g3TnOk6rsJtAvO8qdz6bqY2z4" />
             <meta-data android:name="com.google.android.gms.version" 
            android:value="@integer/google_play_services_version" />
    </application>


</manifest>