DrawPathOn Map

package main.rodeo.com.rodeo.main;

import android.annotation.SuppressLint;
import android.app.Activity;
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.util.Log;

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.MapFragment;
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;

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;

import main.rodeo.com.rodeo.R;
import main.rodeo.com.rodeo.utils.DirectionsJSONParser;

@SuppressLint("NewApi")
public class DrawPathonMap extends Activity implements LocationListener,GoogleMap.OnMapLoadedCallback {

GoogleMap mGoogleMap;
ArrayList mMarkerPoints;
double mLatitude=0;
double mLongitude=0;
LatLng orgPoint = new LatLng(17.361452,78.386990);
LatLng destPoint = new LatLng(17.431563,78.488688 );

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

// 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();
mMarkerPoints.add(orgPoint);
mMarkerPoints.add(destPoint);
// Getting reference to SupportMapFragment of the activity_main
MapFragment mapFragment = ((MapFragment) getFragmentManager().findFragmentById(R.id.map));
mGoogleMap = mapFragment.getMap();

// Enable MyLocation Button in the Map
mGoogleMap.setMyLocationEnabled(true);
mGoogleMap.setOnMapLoadedCallback(this);
// 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){

// mMarkerPoints.clear();
// mGoogleMap.clear();
// LatLng startPoint = new LatLng(mLatitude, mLongitude);
//
// // draw the marker at the current position
// // drawMarker(startPoint);
// drawMarker(orgPoint);
}

// draws the marker at the currently touched location
// 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;
}

@Override
public void onMapLoaded() {
if (mGoogleMap != null) {
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLng(orgPoint));
mGoogleMap.animateCamera(CameraUpdateFactory.zoomTo(12));

drawMarker(orgPoint);
drawMarker(destPoint);

// 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);
}
}
}

/** A class to download data from Google Directions URL */
private class DownloadTask extends AsyncTask{

// 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>> >{

// Parsing the data in non-ui thread
@Override
protected List>> doInBackground(String... jsonData) {

JSONObject jObject;
List>> 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>> result) {
ArrayList points = null;
PolylineOptions lineOptions = null;

// Traversing through all the routes
for(int i=0;i();
lineOptions = new PolylineOptions();

// Fetching i-th route
List> path = result.get(i);

// Fetching all the points in i-th route
for(int j=0;j 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(20);
if(i % 2 == 0)
lineOptions.color(Color.RED);
else
lineOptions.color(Color.BLUE);
}

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

}
}



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 } }