How to draw interactive Polyline on route google maps v2 android
AndroidGoogle MapsGoogle Maps-Android-Api-2Android Problem Overview
i have the following code which is drawing polylines for me and working fine, But the problem is that its not drawing interactive polylines, drawn lines are missing some pixels !
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
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.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class testRoute extends FragmentActivity implements OnClickListener {
private GoogleMap myMap;
Polyline line;
Context context;
// Static LatLng
LatLng startLatLng = new LatLng(30.707104, 76.690749);
LatLng endLatLng = new LatLng(30.721419, 76.730017);
public void onCreate(Bundle bd) {
super.onCreate(bd);
setContentView(R.layout.passanger_home_call);
context = testRoute.this;
// Temp GetTrails Button
Button btntemp = (Button) findViewById(R.id.btn_pass_home_call_temp);
btntemp.setOnClickListener(this);
// GoogleMap myMap
myMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map_pass_home_call)).getMap();
myMap.setMyLocationEnabled(true);
myMap.moveCamera(CameraUpdateFactory.newLatLng(startLatLng));
myMap.animateCamera(CameraUpdateFactory.zoomTo(12));
// Now auto clicking the button
btntemp.performClick();
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_pass_home_call_temp:
String urlTopass = makeURL(startLatLng.latitude,
startLatLng.longitude, endLatLng.latitude,
endLatLng.longitude);
new connectAsyncTask(urlTopass).execute();
break;
default:
break;
}
}
private class connectAsyncTask extends AsyncTask<Void, Void, String> {
private ProgressDialog progressDialog;
String url;
connectAsyncTask(String urlPass) {
url = urlPass;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Fetching route, Please wait...");
progressDialog.setIndeterminate(true);
progressDialog.show();
}
@Override
protected String doInBackground(Void... params) {
JSONParser jParser = new JSONParser();
String json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
progressDialog.hide();
if (result != null) {
drawPath(result);
}
}
}
public String makeURL(double sourcelat, double sourcelog, double destlat,
double destlog) {
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.googleapis.com/maps/api/directions/json");
urlString.append("?origin=");// from
urlString.append(Double.toString(sourcelat));
urlString.append(",");
urlString.append(Double.toString(sourcelog));
urlString.append("&destination=");// to
urlString.append(Double.toString(destlat));
urlString.append(",");
urlString.append(Double.toString(destlog));
urlString.append("&sensor=false&mode=driving&alternatives=true");
return urlString.toString();
}
public class JSONParser {
InputStream is = null;
JSONObject jObj = null;
String json = "";
// constructor
public JSONParser() {
}
public String getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
json = sb.toString();
is.close();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
return json;
}
}
public void drawPath(String result) {
if (line != null) {
myMap.clear();
}
myMap.addMarker(new MarkerOptions().position(endLatLng).icon(
BitmapDescriptorFactory.fromResource(R.drawable.redpin_marker)));
myMap.addMarker(new MarkerOptions().position(startLatLng).icon(
BitmapDescriptorFactory.fromResource(R.drawable.redpin_marker)));
try {
// Tranform the string into a json object
final JSONObject json = new JSONObject(result);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes
.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
List<LatLng> list = decodePoly(encodedString);
for (int z = 0; z < list.size() - 1; z++) {
LatLng src = list.get(z);
LatLng dest = list.get(z + 1);
line = myMap.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude, src.longitude),
new LatLng(dest.latitude, dest.longitude))
.width(5).color(Color.BLUE).geodesic(true));
}
} catch (Exception e) {
e.printStackTrace();
}
}
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;
}
}
Code is Working fine And Drawing Route from one place to another but not drawing the interactive Routes
Screent Shot :- 
I think problem is with my drawPath() method :
public void drawPath(String result) {
if (line != null) {
myMap.clear();
}
myMap.addMarker(new MarkerOptions().position(endLatLng).icon(
BitmapDescriptorFactory.fromResource(R.drawable.redpin_marker)));
myMap.addMarker(new MarkerOptions().position(startLatLng).icon(
BitmapDescriptorFactory.fromResource(R.drawable.redpin_marker)));
try {
// Tranform the string into a json object
final JSONObject json = new JSONObject(result);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes
.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
List<LatLng> list = decodePoly(encodedString);
for (int z = 0; z < list.size() - 1; z++) {
LatLng src = list.get(z);
LatLng dest = list.get(z + 1);
line = myMap.addPolyline(new PolylineOptions()
.add(new LatLng(src.latitude, src.longitude),
new LatLng(dest.latitude, dest.longitude))
.width(5).color(Color.BLUE).geodesic(true));
}
} catch (Exception e) {
e.printStackTrace();
}
}
Ignore The markers just suggest me about adding interactive polyline?
Android Solutions
Solution 1 - Android
Instead of creating too many short Polylines just create one like here:
PolylineOptions options = new PolylineOptions().width(5).color(Color.BLUE).geodesic(true);
for (int z = 0; z < list.size(); z++) {
LatLng point = list.get(z);
options.add(point);
}
line = myMap.addPolyline(options);
I'm also not sure you should use geodesic when your points are so close to each other.
Solution 2 - Android
I've created a couple of map tutorials that will cover what you need
Animating the map describes howto create polylines based on a set of LatLngs. Using Google APIs on your map : Directions and Places describes howto use the Directions API and animate a marker along the path.
Take a look at these 2 tutorials and the Github project containing the sample app.
It contains some tips to make your code cleaner and more efficient:
-
Using Google HTTP Library for more efficient API access and easy JSON handling.
-
Using google-map-utils library for maps-related functions (like decoding the polylines)
-
Animating markers
Solution 3 - Android
You can use this method to draw polyline on googleMap
// Draw polyline on map
public void drawPolyLineOnMap(List<LatLng> list) {
PolylineOptions polyOptions = new PolylineOptions();
polyOptions.color(Color.RED);
polyOptions.width(5);
polyOptions.addAll(list);
googleMap.clear();
googleMap.addPolyline(polyOptions);
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (LatLng latLng : list) {
builder.include(latLng);
}
final LatLngBounds bounds = builder.build();
//BOUND_PADDING is an int to specify padding of bound.. try 100.
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, BOUND_PADDING);
googleMap.animateCamera(cu);
}
You need to add this line in your gradle in case you haven't.
compile 'com.google.android.gms:play-services-maps:8.4.0'
Solution 4 - Android
You should use options.addAll(allPoints); instead of options.add(point);
Solution 5 - Android
Using the google maps projection api to draw the polylines on an overlay view enables us to do a lot of things. Check this repo that has an example.
