#google map v2

Code:

 GMapV2Direction.java

import android.graphics.Color;

import android.util.Log;import com.google.android.gms.maps.GoogleMap;

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

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

import com.loopj.android.http.AsyncHttpClient;

import com.loopj.android.http.TextHttpResponseHandler;

import org.apache.http.Header;

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 org.xml.sax.InputSource;

import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

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) {

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.d("url", url);

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) {

try {

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();

} catch (Exception e) {

return "0";

}

}

public int getDurationValue(Document doc) {

try {

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());

} catch (Exception e) {

return -1;

}

}

public String getDistanceText(Document doc) {

/*

* while (en.hasMoreElements()) { type type = (type) en.nextElement();

* 

* }

*/

try {

NodeList nl1;

nl1 = doc.getElementsByTagName("distance");

Node node1 = nl1.item(nl1.getLength() - 1);

NodeList nl2 = null;

nl2 = node1.getChildNodes();

Node node2 = nl2.item(getNodeIndex(nl2, "value"));

Log.d("DistanceText", node2.getTextContent());

return node2.getTextContent();

} catch (Exception e) {

return "-1";

}

/*

* NodeList nl1; if(doc.getElementsByTagName("distance")!=null){ nl1=

* doc.getElementsByTagName("distance");

* 

* Node node1 = nl1.item(nl1.getLength() - 1); NodeList nl2 = null; if

* (node1.getChildNodes() != null) { nl2 = node1.getChildNodes(); Node

* node2 = nl2.item(getNodeIndex(nl2, "value")); Log.d("DistanceText",

* node2.getTextContent()); return node2.getTextContent(); } else return

* "-1";} else return "-1";

*/

}

public int getDistanceValue(Document doc) {

try {

NodeList nl1 = doc.getElementsByTagName("distance");

Node node1 = null;

node1 = nl1.item(nl1.getLength() - 1);

NodeList nl2 = node1.getChildNodes();

Node node2 = nl2.item(getNodeIndex(nl2, "value"));

Log.i("DistanceValue", node2.getTextContent());

return Integer.parseInt(node2.getTextContent());

} catch (Exception e) {

return -1;

}

/*

* NodeList nl1 = doc.getElementsByTagName("distance"); Node node1 =

* null; if (nl1.getLength() > 0) node1 = nl1.item(nl1.getLength() - 1);

* if (node1 != null) { NodeList nl2 = node1.getChildNodes(); Node node2

* = nl2.item(getNodeIndex(nl2, "value")); Log.i("DistanceValue",

* node2.getTextContent()); return

* Integer.parseInt(node2.getTextContent()); } else return 0;

*/

}

public String getStartAddress(Document doc) {

try {

NodeList nl1 = doc.getElementsByTagName("start_address");

Node node1 = nl1.item(0);

Log.i("StartAddress", node1.getTextContent());

return node1.getTextContent();

} catch (Exception e) {

return "-1";

}

}

public String getEndAddress(Document doc) {

try {

NodeList nl1 = doc.getElementsByTagName("end_address");

Node node1 = nl1.item(0);

Log.i("StartAddress", node1.getTextContent());

return node1.getTextContent();

} catch (Exception e) {

return "-1";

}

}

public String getCopyRights(Document doc) {

try {

NodeList nl1 = doc.getElementsByTagName("copyrights");

Node node1 = nl1.item(0);

Log.i("CopyRights", node1.getTextContent());

return node1.getTextContent();

} catch (Exception e) {

return "-1";

}

}

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;

}

public void drawRoute(LatLng start, LatLng end, final GoogleMap map,

final onGetRouteListener callback) {

AsyncHttpClient client = new AsyncHttpClient();

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";

client.get(url, new TextHttpResponseHandler() {

@Override

public void onStart() {

callback.onStart();

}

@Override

public void onSuccess(int resultCode, Header[] arg1, String content) {

try {

DocumentBuilder builder = DocumentBuilderFactory

.newInstance().newDocumentBuilder();

Document doc = builder.parse((new InputSource(new ByteArrayInputStream(content.getBytes("utf-8")))));

                    ArrayList<LatLng> directionPoint = getDirection(doc);

PolylineOptions rectLine = new PolylineOptions().width(8)

.color(Color.BLUE);

for (int i = 0; i < directionPoint.size(); i++) {

rectLine.add(directionPoint.get(i));

}

map.addPolyline(rectLine);

callback.onSuccess();

} catch (Exception e) {

e.printStackTrace();

}

}

@Override

public void onFailure(int resultCode, Header[] arg1, String arg2,

Throwable arg3) {

callback.onFail();

}

});

}

public interface onGetRouteListener {

public void onStart();

public void onSuccess();

public void onFail();

}