I Have some code that showing between two directions which the destination has initialized (known position). The full code like this :
package com.my.app;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.FragmentManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
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.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.PolylineOptions;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.SupportMapFragment;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class CobaMap2 extends FragmentActivity {
final int RQS_GooglePlayServices = 1;
private GoogleMap myMap;
double src_lat = -7.81016;
double src_long = 110.46860;
double dest_lat = -7.778031;
double dest_long = 110.494180;
MarkerOptions markerOptions;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map_layout2);
myMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
myMap.setMyLocationEnabled(true);
// Set Current Location
moveToMyLocation();}
private void moveToMyLocation()
{
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
if (location != null)
{
myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(),
location.getLongitude()), 13));
}
// choose map layout
RadioGroup rgViews = (RadioGroup) findViewById(R.id.rg_views);
rgViews.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
if(checkedId == R.id.rb_normal){
myMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}else if(checkedId == R.id.rb_satellite){
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
}else if(checkedId == R.id.rb_terrain){
myMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
}
}
});
LatLng srcLatLng = new LatLng(src_lat, src_long);
LatLng destLatLng = new LatLng(dest_lat, dest_long);
myMap.addMarker(new MarkerOptions()
.position(srcLatLng).title("Source place"));
myMap.animateCamera(CameraUpdateFactory.newLatLng(srcLatLng));
myMap.addMarker(new MarkerOptions()
.position(destLatLng).title("Destination place"));
// Enabling MyLocation in Google Map
myMap.setMyLocationEnabled(true);
myMap.getUiSettings().setZoomControlsEnabled(true);
myMap.getUiSettings().setCompassEnabled(true);
myMap.getUiSettings().setMyLocationButtonEnabled(true);
myMap.getUiSettings().setAllGesturesEnabled(true);
myMap.setTrafficEnabled(true);
myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(srcLatLng,12));
markerOptions = new MarkerOptions();
// Polyline line = myMap.addPolyline(new PolylineOptions().add(srcLatLng, destLatLng).width(5).color(Color.RED));
connectAsyncTask _connectAsyncTask = new connectAsyncTask();
_connectAsyncTask.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.cobamap, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_legalnotices:
String LicenseInfo = GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo(
getApplicationContext());
AlertDialog.Builder LicenseDialog = new AlertDialog.Builder(CobaMap2.this);
LicenseDialog.setTitle("Legal Notices");
LicenseDialog.setMessage(LicenseInfo);
LicenseDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if (resultCode == ConnectionResult.SUCCESS){
Toast.makeText(getApplicationContext(),
"isGooglePlayServicesAvailable SUCCESS",
Toast.LENGTH_LONG).show();
}else{
GooglePlayServicesUtil.getErrorDialog(resultCode, this, RQS_GooglePlayServices);
}
}
private class connectAsyncTask extends AsyncTask<Void, Void, Void>{
private ProgressDialog progressDialog;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progressDialog = new ProgressDialog(CobaMap2.this);
progressDialog.setMessage("Fetching route, Please wait...");
progressDialog.setIndeterminate(true);
progressDialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
fetchData();
return null;
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
if(doc!=null){
NodeList _nodelist = doc.getElementsByTagName("status");
Node node1 = _nodelist.item(0);
String _status1 = node1.getChildNodes().item(0).getNodeValue();
if(_status1.equalsIgnoreCase("OK")){
NodeList _nodelist_path = doc.getElementsByTagName("overview_polyline");
Node node_path = _nodelist_path.item(0);
Element _status_path = (Element)node_path;
NodeList _nodelist_destination_path = _status_path.getElementsByTagName("points");
Node _nodelist_dest = _nodelist_destination_path.item(0);
String _path = _nodelist_dest.getChildNodes().item(0).getNodeValue();
List<LatLng> directionPoint = decodePoly(_path);
PolylineOptions rectLine = new PolylineOptions().width(10).color(Color.BLUE);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
// Adding route on the map
myMap.addPolyline(rectLine);
markerOptions.position(new LatLng(dest_lat, dest_long));
markerOptions.draggable(true);
myMap.addMarker(markerOptions);
}else{
showAlert("Unable to find the route");
}
}else{
showAlert("Unable to find the route");
}
progressDialog.dismiss();
}
}
Document doc = null;
private void fetchData()
{
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.google.com/maps/api/directions/xml?origin=");
urlString.append(src_lat);
urlString.append(",");
urlString.append(src_long);
urlString.append("&destination=");//to
urlString.append(dest_lat);
urlString.append(",");
urlString.append(dest_long);
urlString.append("&sensor=true&mode=driving");
Log.d("url","::"+urlString.toString());
HttpURLConnection urlConnection= null;
URL url = null;
try
{
url = new URL(urlString.toString());
urlConnection=(HttpURLConnection)url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.setDoInput(true);
urlConnection.connect();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = (Document) db.parse(urlConnection.getInputStream());//Util.XMLfromString(response);
}catch (MalformedURLException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}catch (ParserConfigurationException e){
e.printStackTrace();
}
catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void showAlert(String message){
AlertDialog.Builder alert = new AlertDialog.Builder(CobaMap2.this);
alert.setTitle("Error");
alert.setCancelable(false);
alert.setMessage(message);
alert.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
alert.show();
}
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;
}
}
The code worked perfectly, You can see between two location (source and destination) are known location. then i need change the first location (source location) with my current Location, and current location detected by this code :
// Set Current Location
moveToMyLocation();}
private void moveToMyLocation()
{
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
if (location != null)
{
myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(location.getLatitude(),
location.getLongitude()), 13));
}
And code to initialized the location is :
LatLng srcLatLng = new LatLng(src_lat, src_long);
LatLng destLatLng = new LatLng(dest_lat, dest_long);
The problem is, how to passing data from my current location to set the data for the source location and show path between location. (Source : My current Location, Destination : Known Location). What the method must i use ?. I mean the app show from my current location to destination location with modify that code ?