flutter google maps custom icon not showing when called in initState() - google-maps

Question

i have created a map view with google_maps_flutter 1.0.2 in my flutter app and i'm setting 3 different custom markers on my mapview. two of them are set using a check box but i want to show first set of custom markers when the app first started up. with this code i can set the marker when i first launch the app but marker icon is default one(red baloon like icon) not my custom icon but if i tap the check box twice i'll get the markers with my icon. i tried even using after_layout library fix this issue but no luck.
import 'dart:async';
import 'package:expandable_bottom_sheet/expandable_bottom_sheet.dart';
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
import 'package:location/location.dart';
import 'package:after_layout/after_layout.dart';
class RoadAssistance extends StatefulWidget {
#override
_RoadAssistanceState createState() => _RoadAssistanceState();
}
class _RoadAssistanceState extends State<RoadAssistance>
with AfterLayoutMixin<RoadAssistance> {
Completer<GoogleMapController> _controller = Completer();
CameraPosition _currentPosition = CameraPosition(
target: LatLng(6.9147, 79.9729),
zoom: 15.4746,
);
Set<Marker> markers = Set();
Set<Marker> markers1 = Set();
bool askingPermission = false;
bool showGarages = false;
bool showBranches = true;
bool firstTime = true;
LocationData _locationData;
BitmapDescriptor myPosIcon;
BitmapDescriptor branchIcon;
BitmapDescriptor garageIcon;
#override
void initState() {
super.initState();
BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(55, 55)), 'images/me.png')
.then((onValue) {
myPosIcon = onValue;
});
BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(55, 55)), 'images/home-city.png')
.then((onValue) {
branchIcon = onValue;
});
BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(48, 48)), 'images/wrench.png')
.then((onValue) {
garageIcon = onValue;
});
}
#override
Widget build(BuildContext context) {
double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;
var padding = MediaQuery.of(context).padding;
return Scaffold(
appBar: AppBar(
title: Text('Road Assitance'),
backgroundColor: Color.fromRGBO(0, 172, 192, 100),
),
body: ExpandableBottomSheet(
background: Stack(children: [
SizedBox(
height: height - 130,
child: GoogleMap(
mapType: MapType.normal,
initialCameraPosition: _currentPosition,
myLocationEnabled: true,
myLocationButtonEnabled: true,
markers: markers,
onMapCreated: (GoogleMapController controller) {
_controller.complete(controller);
},
),
),
Container(
padding: EdgeInsets.all(5),
width: width,
height: height - 240,
child: Column(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Column(
children: [
Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(12),
boxShadow: [
BoxShadow(
color: Colors.black38.withOpacity(0.6),
spreadRadius: 1,
blurRadius: 4,
offset:
Offset(0, 3), // changes position of shadow
),
],
),
width: 160,
padding: EdgeInsets.all(5),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
SizedBox(
height: 30.0,
width: 30.0,
child: Checkbox(
value: showBranches,
onChanged: (bool newValue) {
newValue
? loadBranches()
: unloadBranches();
setState(() {
showBranches = newValue;
print(newValue);
});
}),
),
Icon(
MdiIcons.homeCity,
color: Colors.green[700],
),
SizedBox(
width: 5,
),
Text(
'Branches',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.w600,
),
)
],
),
),
SizedBox(
height: 10,
),
Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(12),
boxShadow: [
BoxShadow(
color: Colors.black38.withOpacity(0.6),
spreadRadius: 1,
blurRadius: 4,
offset:
Offset(0, 3), // changes position of shadow
),
],
),
width: 160,
padding: EdgeInsets.all(5),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
SizedBox(
height: 30.0,
width: 30.0,
child: Checkbox(
value: showGarages,
onChanged: (bool newValue) {
newValue ? loadGarages() : unloadGarages();
setState(() {
showGarages = newValue;
print(newValue);
});
}),
),
Icon(
MdiIcons.hammerWrench,
color: Colors.orange[700],
),
SizedBox(
width: 5,
),
Text(
'Garages',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.w600,
),
)
],
),
),
],
),
],
),
),
]),
),
}
#override
void afterFirstLayout(BuildContext context) {
// Calling the same function "after layout" to resolve the issue.
loadBranches();
print("function called");
}
getLocation() async {
Location location = new Location();
LocationData _locationData1;
bool _serviceEnabled;
PermissionStatus _permissionGranted;
_serviceEnabled = await location.serviceEnabled();
if (!_serviceEnabled) {
_serviceEnabled = await location.requestService();
if (!_serviceEnabled) {
return;
}
}
_permissionGranted = await location.hasPermission();
if (_permissionGranted == PermissionStatus.denied) {
_permissionGranted = await location.requestPermission();
if (_permissionGranted != PermissionStatus.granted) {
return;
}
}
_locationData1 = await location.getLocation();
print(_locationData1);
final GoogleMapController controller = await _controller.future;
controller.animateCamera(CameraUpdate.newCameraPosition(_currentPosition));
markers.add(
Marker(
markerId: MarkerId('I\'m Here'),
position: LatLng(_locationData1.latitude, _locationData1.longitude),
icon: myPosIcon,
),
);
setState(() {
_currentPosition = new CameraPosition(
target: LatLng(_locationData1.latitude, _locationData1.longitude),
zoom: 15.4746,
);
});
}
loadGarages() {
print("laod garages called");
markers.addAll([
Marker(
markerId: MarkerId('SLIC Garage'),
position: LatLng(6.9217, 79.9739),
infoWindow: InfoWindow(title: 'SLIC Garage New'),
icon: garageIcon,
),
Marker(
markerId: MarkerId('SLIC Garage 2'),
position: LatLng(6.9197, 79.9639),
infoWindow: InfoWindow(title: 'SLIC Garage Nugapityiia'),
icon: garageIcon,
),
Marker(
markerId: MarkerId('SLIC Garage 3'),
position: LatLng(6.9087, 79.9729),
infoWindow: InfoWindow(title: 'SLIC Garage '),
icon: garageIcon,
),
]);
}
unloadGarages() {
print("unlaod garages called");
markers.removeWhere((x) => x.icon == garageIcon);
}
loadBranches() {
print("laod branches called");
markers.addAll([
Marker(
markerId: MarkerId('SLIC Branch'),
position: LatLng(6.9167, 79.9749),
infoWindow: InfoWindow(title: 'SLIC Branch Hewagama'),
icon: branchIcon,
),
Marker(
markerId: MarkerId('SLIC Branch 2'),
position: LatLng(6.9157, 79.9639),
infoWindow: InfoWindow(title: 'SLIC Branch Kotahawala'),
icon: branchIcon,
),
Marker(
markerId: MarkerId('SLIC Branch Malabe'),
position: LatLng(6.9287, 79.9729),
icon: branchIcon,
),
]);
}
unloadBranches() {
if (firstTime) {
markers.clear();
firstTime = false;
return;
}
print("unlaod branches called");
markers.removeWhere((x) => x.icon == branchIcon);
}
}

Answer 1

You can try this:
#override
void initState() {
WidgetsBinding.instance.addPostFrameCallback((_) async {
myPosIcon = await BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(55, 55)), 'images/me.png');
branchIcon = await BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(55, 55)), 'images/home-city.png');
garageIcon = await BitmapDescriptor.fromAssetImage(
ImageConfiguration(size: Size(48, 48)), 'images/wrench.png');
setState(() {});
});
super.initState();
}