I had the same probelm solved by using this plugin google_maps_flutter: ^0.5.19
import 'package:google_maps_flutter/google_maps_flutter.dart';
static const LatLng _center = const LatLng(33.738045, 73.084488);
final Set _markers = {};
final Set_polyline={};
//add your lat and lng where you wants to draw polyline
LatLng _lastMapPosition = _center;
List latlng = List();
LatLng _new = LatLng(33.738045, 73.084488);
LatLng _news = LatLng(33.567997728, 72.635997456);
latlng.add(_new);
latlng.add(_news);
//call this method on button click that will draw a polyline and markers
void _onAddMarkerButtonPressed() {
getDistanceTime();
setState(() {
_markers.add(Marker(
// This marker id can be anything that uniquely identifies each marker.
markerId: MarkerId(_lastMapPosition.toString()),
//_lastMapPosition is any coordinate which should be your default
//position when map opens up
position: _lastMapPosition,
infoWindow: InfoWindow(
title: 'Really cool place',
snippet: '5 Star Rating',
),
icon: BitmapDescriptor.defaultMarker,
));
_polyline.add(Polyline(
polylineId: PolylineId(_lastMapPosition.toString()),
visible: true,
//latlng is List
points: latlng,
color: Colors.blue,
));
});
//in your build widget method
GoogleMap(
//that needs a list
polylines:_polyline,
markers: _markers,
onMapCreated: _onMapCreated,
myLocationEnabled:true,
onCameraMove: _onCameraMove,
initialCameraPosition: CameraPosition(
target: _center,
zoom: 11.0,
),
mapType: MapType.normal,
);
}
