Android How to show route between markers on googlemaps

Question

I am creating an application that will show the location of the user and place the marker at this position. After moving the user. The marker will be deleted and a new marker will be created. Now. I want to make the markers at points A and Point B hard-coded in the application and show the route on the map. He must use the nearest road on the map. I did some research, but found only old code dated 5 years ago. Can anyone be kind to guide me through this.

Point A and point B are in the LocationChanged method.

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.BitmapDescriptorFactory; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.Marker; import com.google.android.gms.maps.model.MarkerOptions; import android.content.Context; import android.content.Intent; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.provider.Settings; import android.support.v4.app.FragmentActivity; import android.widget.Toast; public class MainActivity extends FragmentActivity implements LocationListener { private GoogleMap map; private LocationManager locationManager; private String provider; LatLng coordinate; Marker startPerc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE); boolean enabledGPS = service .isProviderEnabled(LocationManager.GPS_PROVIDER); boolean enabledWiFi = service .isProviderEnabled(LocationManager.NETWORK_PROVIDER); // Check if enabled and if not send user to the GSP settings // Better solution would be to display a dialog and suggesting to // go to the settings if (!enabledGPS) { Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show(); Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); startActivity(intent); } locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); // Define the criteria how to select the location provider -> use // default Criteria criteria = new Criteria(); provider = locationManager.getBestProvider(criteria, false); Location location = locationManager.getLastKnownLocation(provider); // Initialize the location fields if (location != null) { Toast.makeText(this, "Selected Provider " + provider, Toast.LENGTH_SHORT).show(); onLocationChanged(location); } else { //do something } } /* Request updates at startup */ @Override protected void onResume() { super.onResume(); locationManager.requestLocationUpdates(provider, 300, 1, this); } /* Remove the locationlistener updates when Activity is paused */ @Override protected void onPause() { super.onPause(); locationManager.removeUpdates(this); } @Override public void onLocationChanged(Location location) { double lat = location.getLatitude(); double lng = location.getLongitude(); Toast.makeText(this, "Location " + lat+","+lng, Toast.LENGTH_LONG).show(); LatLng coordinate = new LatLng(lat, lng); Toast.makeText(this, "Location " + coordinate.latitude+","+coordinate.longitude, Toast.LENGTH_LONG).show(); if(map!=null){ map.clear(); } //map.clear(); GoogleMap map; if(startPerc!=null){ startPerc.remove(); } map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); startPerc = map.addMarker(new MarkerOptions() .position(coordinate) .title("Start") .snippet("Your Position") .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher))); map.moveCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 20)); map.addMarker(new MarkerOptions() .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)) .position(new LatLng(3.214732, 101.747047)) .title("Point A") .snippet("Bus Stop") .flat(true)); map.addMarker(new MarkerOptions() .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)) .position(new LatLng(3.214507, 101.749697)) .title("Point B") .snippet("Bus Stop") .flat(true)); startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)); } @ Override public void onProviderDisabled(String provider) { Toast.makeText(this, "Enabled new provider " + provider, Toast.LENGTH_SHORT).show(); } @Override public void onProviderEnabled(String provider) { Toast.makeText(this, "Disabled provider " + provider, Toast.LENGTH_SHORT).show(); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } void Delay(int Seconds){ long Time = 0; Time = System.currentTimeMillis(); while(System.currentTimeMillis() < Time+(Seconds*1000)); } } 

New code provided by K Neeraj. Still unfortunately, please check.

 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 com.google.android.gms.maps.CameraUpdateFactory; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.OnMapReadyCallback; 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.Marker; import com.google.android.gms.maps.model.MarkerOptions; import com.google.android.gms.maps.model.PolylineOptions; import android.content.Context; import android.content.Intent; 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.provider.Settings; import android.support.v4.app.FragmentActivity; import android.util.Log; import android.widget.Toast; public class MainActivity extends FragmentActivity implements LocationListener { private GoogleMap map; private LocationManager locationManager; private String provider; LatLng coordinate; Marker startPerc; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE); boolean enabledGPS = service .isProviderEnabled(LocationManager.GPS_PROVIDER); boolean enabledWiFi = service .isProviderEnabled(LocationManager.NETWORK_PROVIDER); // Check if enabled and if not send user to the GSP settings // Better solution would be to display a dialog and suggesting to // go to the settings if (!enabledGPS) { Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show(); Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); startActivity(intent); } locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); // Define the criteria how to select the location provider -> use // default Criteria criteria = new Criteria(); provider = locationManager.getBestProvider(criteria, false); Location location = locationManager.getLastKnownLocation(provider); // Initialize the location fields if (location != null) { Toast.makeText(this, "Selected Provider " + provider, Toast.LENGTH_SHORT).show(); onLocationChanged(location); } else { //do something } } /* Request updates at startup */ @Override protected void onResume() { super.onResume(); locationManager.requestLocationUpdates(provider, 300, 1, this); } /* Remove the locationlistener updates when Activity is paused */ @Override protected void onPause() { super.onPause(); locationManager.removeUpdates(this); } @Override public void onLocationChanged(Location location) { double lat = location.getLatitude(); double lng = location.getLongitude(); Toast.makeText(this, "Location " + lat+","+lng, Toast.LENGTH_LONG).show(); LatLng coordinate = new LatLng(lat, lng); Toast.makeText(this, "Location " + coordinate.latitude+","+coordinate.longitude, Toast.LENGTH_LONG).show(); if(map!=null){ map.clear(); } GoogleMap map; if(startPerc!=null){ startPerc.remove(); } map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); startPerc = map.addMarker(new MarkerOptions() .position(coordinate) .title("Start") .snippet("Your Position") .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher))); map.moveCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 12)); startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)); // Assign your origin and destination // These points are your markers coordinates LatLng origin = new LatLng(3.214732, 101.747047); LatLng dest = new LatLng(3.214507, 101.749697); // 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; } // Fetches data from url passed 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 Places 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; MarkerOptions markerOptions = new MarkerOptions(); // 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 map.addPolyline(lineOptions); } } @ Override public void onProviderDisabled(String provider) { Toast.makeText(this, "Enabled new provider " + provider, Toast.LENGTH_SHORT).show(); } @Override public void onProviderEnabled(String provider) { Toast.makeText(this, "Disabled provider " + provider, Toast.LENGTH_SHORT).show(); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub } void Delay(int Seconds){ long Time = 0; Time = System.currentTimeMillis(); while(System.currentTimeMillis() < Time+(Seconds*1000)); } } 

Then I created a new DirectionJSONParser.java

 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; } } 

Answer 1

 @Override public void onLocationChanged(Location location) { .... startPerc.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)); // Assign your origin and destination // These points are your markers coordinates LatLng origin = new LatLng(3.214732, 101.747047); LatLng dest = new LatLng(3.214507, 101.749697); // 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; } // Fetches data from url passed 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 Places 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; MarkerOptions markerOptions = new MarkerOptions(); // 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 map.addPolyline(lineOptions); } } 

Look at this tutorial,

Drawing a driving route Routes between two locations using Google Directions in Google Map Android Api v2

Shows how to draw a route map between two points.

Answer 2

Here is the complete code with a few changes. It is just more beautiful.

 import android.app.Activity; import android.os.AsyncTask; import android.util.Log; import com.eddress.R; import com.google.android.gms.maps.GoogleMap; import com.google.android.gms.maps.model.LatLng; 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; public class GoogleMapsPath { public GoogleMap map; public GoogleMapsPath(Activity context, GoogleMap map, LatLng origin, LatLng dest){ this.map = map; String url = getDirectionsUrl(origin,dest); FetchUrl FetchUrl = new FetchUrl(); FetchUrl.execute(url); } // Fetches data from url passed private class FetchUrl extends AsyncTask<String, Void, String> { @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]); Log.d("Background Task data", data.toString()); } catch (Exception e) { Log.d("Background Task", e.toString()); } return data; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); ParserTask parserTask = new ParserTask(); // Invokes the thread for parsing the JSON data parserTask.execute(result); } } 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(); Log.d("downloadUrl", data.toString()); br.close(); } catch (Exception e) { Log.d("Exception", e.toString()); } finally { iStream.close(); urlConnection.disconnect(); } return data; } 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; } 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]); Log.d("ParserTask",jsonData[0].toString()); DirectionsJSONParser parser = new DirectionsJSONParser(); Log.d("ParserTask", parser.toString()); // Starts parsing data routes = parser.parse(jObject); Log.d("ParserTask","Executing routes"); Log.d("ParserTask",routes.toString()); } catch (Exception e) { Log.d("ParserTask",e.toString()); 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; PolylineOptions lineOptions = null; // Traversing through all the routes for (int i = 0; i < result.size(); i++) { points = new ArrayList<>(); 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(8); lineOptions.color(R.color.globalRedLight); Log.d("onPostExecute","onPostExecute lineoptions decoded"); } // Drawing polyline in the Google Map for the i-th route if(lineOptions != null) { map.addPolyline(lineOptions); } else { Log.d("onPostExecute","without Polylines drawn"); } } } }