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@olayemii
Created January 30, 2021 17:04
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Adding polylines to Google Maps on flutter
import 'dart:async';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
// Starting point latitude
double _originLatitude = 6.5212402;
// Starting point longitude
double _originLongitude = 3.3679965;
// Destination latitude
double _destLatitude = 6.849660;
// Destination Longitude
double _destLongitude = 3.648190;
// Markers to show points on the map
Map<MarkerId, Marker> markers = {};
PolylinePoints polylinePoints = PolylinePoints();
Map<PolylineId, Polyline> polylines = {};
class _MyAppState extends State<MyApp> {
// Google Maps controller
Completer<GoogleMapController> _controller = Completer();
// Configure map position and zoom
static final CameraPosition _kGooglePlex = CameraPosition(
target: LatLng(_originLatitude, _originLongitude),
zoom: 9.4746,
);
@override
void initState() {
/// add origin marker origin marker
_addMarker(
LatLng(_originLatitude, _originLongitude),
"origin",
BitmapDescriptor.defaultMarker,
);
// Add destination marker
_addMarker(
LatLng(_destLatitude, _destLongitude),
"destination",
BitmapDescriptor.defaultMarkerWithHue(90),
);
_getPolyline();
super.initState();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Welcome to Flutter',
home: Scaffold(
appBar: AppBar(
title: Text('Welcome to Flutter'),
),
body: GoogleMap(
mapType: MapType.normal,
initialCameraPosition: _kGooglePlex,
myLocationEnabled: true,
tiltGesturesEnabled: true,
compassEnabled: true,
scrollGesturesEnabled: true,
zoomGesturesEnabled: true,
polylines: Set<Polyline>.of(polylines.values),
markers: Set<Marker>.of(markers.values),
onMapCreated: (GoogleMapController controller) {
_controller.complete(controller);
},
),
),
);
}
// This method will add markers to the map based on the LatLng position
_addMarker(LatLng position, String id, BitmapDescriptor descriptor) {
MarkerId markerId = MarkerId(id);
Marker marker =
Marker(markerId: markerId, icon: descriptor, position: position);
markers[markerId] = marker;
}
_addPolyLine(List<LatLng> polylineCoordinates) {
PolylineId id = PolylineId("poly");
Polyline polyline = Polyline(
polylineId: id,
points: polylineCoordinates,
width: 8,
);
polylines[id] = polyline;
setState(() {});
}
void _getPolyline() async {
List<LatLng> polylineCoordinates = [];
PolylineResult result = await polylinePoints.getRouteBetweenCoordinates(
"YOUR API KEY HERE",
PointLatLng(_originLatitude, _originLongitude),
PointLatLng(_destLatitude, _destLongitude),
travelMode: TravelMode.driving,
);
if (result.points.isNotEmpty) {
result.points.forEach((PointLatLng point) {
polylineCoordinates.add(LatLng(point.latitude, point.longitude));
});
} else {
print(result.errorMessage);
}
_addPolyLine(polylineCoordinates);
}
}
@Balaji8555
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When copy this code , not shown polyline between two locations, but shown only markers .

@olayemii
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Author

@Balaji8555 do you see any errors? And have you activated:

  • Maps SDK for Android
  • Maps SDK for iOS
  • Directions API?

@surajgariya00
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surajgariya00 commented Oct 11, 2023

you know how i show it in flutter web, I have coordinates of two points I just want polylines like your in between the points

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