I am new to android. I want to draw routes between multiple markers. I a, getting latitude, longitude and datetime from server. Now i want to show route between the points. I have stored them in arraylist. Here is how i am getting the points in async task doInBackground().
newLatt= new ArrayList<String>();
newLongg= new ArrayList<String>();
newdatTime= new ArrayList<String>();
JSONArray arr = new JSONArray(strServerResponse);
for (int i = 0; i < arr.length(); i++) {
JSONObject jsonObj1 = arr.getJSONObject(i);
String status = jsonObj1.optString("status");
if (status!="false"){
Pojo pojo = new Pojo();
String latitude = jsonObj1.optString("Latitude");
String longitude = jsonObj1.optString("Longitude");
String date_time = jsonObj1.optString("date_time");
newLatt.add(latitude);
newLongg.add(longitude);
newdatTime.add(date_time);
}else {
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
@Override
public void run() {
AlertDialog alertDialog = new AlertDialog.Builder(
MapActivity.this).create();
alertDialog.setMessage("Locations Not Available");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
}
);
}
and in postExecute() method i am showing markers
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = supportMapFragment.getMap();
map.setMyLocationEnabled(true);
if (newLatt.size()>0){
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
String dattme = newdatTime.get(i);
dest = new LatLng(lati, longi);
if (map != null) {
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(dest);
map.moveCamera(CameraUpdateFactory.newLatLng(dest));
map.animateCamera(CameraUpdateFactory.zoomTo(15));
markerOptions.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
markerOptions.title("" + dattme);
map.addMarker(markerOptions);
map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
marker.showInfoWindow();
return false;
}
});
UPDATE
PolylineOptions rectOptions = new PolylineOptions();
//this is the color of route
rectOptions.color(Color.argb(255, 85, 166, 27));
LatLng startLatLng = null;
LatLng endLatLng = null;
SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
map = supportMapFragment.getMap();
map.setMyLocationEnabled(true);
if (newLatt.size()>0){
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
String dattme = newdatTime.get(i);
dest = new LatLng(lati, longi);
if (map != null) {
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(dest);
map.moveCamera(CameraUpdateFactory.newLatLng(dest));
map.animateCamera(CameraUpdateFactory.zoomTo(15));
markerOptions.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
markerOptions.title("" + dattme);
map.addMarker(markerOptions);
map.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
@Override
public boolean onMarkerClick(Marker marker) {
marker.showInfoWindow();
return false;
}
});
LatLng latlng = new LatLng(lati,
longi);
if (i == 0) {
startLatLng = latlng;
}
if (i == newLatt.size() - 1) {
endLatLng = latlng;
}
rectOptions.add(latlng);
String url = getDirectionsUrl(startLatLng, endLatLng);
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(url);
}
}
map.addPolyline(rectOptions);
getDirections:
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;
}
In your postExecute add the following code to add ploylines on the map.
PolylineOptions rectOptions = new PolylineOptions();
//this is the color of route
rectOptions.color(Color.argb(255, 85, 166, 27));
LatLng startLatLng = null;
LatLng endLatLng = null;
for (int i = 0; i < newLatt.size(); i++) {
Double lati = Double.parseDouble(newLatt.get(i));
Double longi = Double.parseDouble(newLongg.get(i));
LatLng latlng = new LatLng(lati,
longi);
if (i == 0) {
startLatLng = latlng;
}
if (i == jArr.length() - 1) {
endLatLng = latlng;
}
rectOptions.add(latlng);
}
map.addPolyline(rectOptions);
Happy coding...