Binding has not yet been initialized. When Using isloates - flutter

Question

** I am creating google map location app
I tried to resolve my self but i am not able to fix this bug
Please help me to fix this bug
i am getting error when i create isolate for get location
I have used packages
google_maps_flutter: ^2.1.8
geocoding: ^2.0.4
geolocator: ^8.2.1
flutter_bloc: ^8.0.1
**
i got error
> Restarted application in 2,738ms.
D/MapsInitializer( 6872): preferredRenderer: null
D/zzca ( 6872): preferredRenderer: null
I/Google Maps Android API( 6872): Google Play services package version: 221215028
I/Google Maps Android API( 6872): Google Play services maps renderer version(legacy): 203115000
7
I/Counters( 6872): exceeded sample count in FrameTime
>
> I/m.example.g_ma( 6872): NativeAlloc concurrent copying GC freed 17476(988KB) AllocSpace objects, 0(0B) LOS objects, 50% free, 7MB/14MB, paused 172us total 133.433ms
10
I/Counters( 6872): exceeded sample count in FrameTime
I/m.example.g_ma( 6872): NativeAlloc concurrent copying GC freed 4201(193KB) AllocSpace objects, 0(0B) LOS objects, 49% free, 7MB/14MB, paused 138us total 149.308ms
7
I/Counters( 6872): exceeded sample count in FrameTime
I/chatty ( 6872): uid=10498(com.example.g_map) androidmapsapi- identical 1 line
3
I/Counters( 6872): exceeded sample count in FrameTime
E/flutter ( 6872): [ERROR:flutter/runtime/dart_isolate.cc(1098)] Unhandled exception:
E/flutter ( 6872): Binding has not yet been initialized.
E/flutter ( 6872): The "instance" getter on the ServicesBinding binding mixin is only available once that binding has been initialized.
E/flutter ( 6872): Typically, this is done by calling "WidgetsFlutterBinding.ensureInitialized()" or "runApp()" (the latter calls the former). Typically this call is done in the "void main()" method. The "ensureInitialized" method is idempotent; calling it multiple times is not harmful. After calling that method, the "instance" getter will return the binding.
E/flutter ( 6872): In a test, one can call "TestWidgetsFlutterBinding.ensureInitialized()" as the first line in the test's "main()" method to initialize the binding.
E/flutter ( 6872): If ServicesBinding is a custom binding mixin, there must also be a custom binding class, like WidgetsFlutterBinding, but that mixes in the selected binding, and that is the class that must be constructed before using the "instance" getter.
E/flutter ( 6872): #0 BindingBase.checkInstance.<anonymous closure>
package:flutter/…/foundation/binding.dart:281
E/flutter ( 6872): #1 BindingBase.checkInstance
package:flutter/…/foundation/binding.dart:363
E/flutter ( 6872): #2 ServicesBinding.instance
package:flutter/…/services/binding.dart:48
E/flutter ( 6872): #3 MethodChannel.binaryMessenger
package:flutter/…/services/platform_channel.dart:132
**My Code is **
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:g_map/cubit/googlemap_cubit.dart';
// import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'screens/home_page.dart';
void main() async{
WidgetsFlutterBinding.ensureInitialized();
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return BlocProvider<GooglemapCubit>(
create: (context) => GooglemapCubit(),
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Map'),
),
);
}
}
import 'dart:developer';
import 'package:geolocator/geolocator.dart';
class GLocationPermission{
Future<bool> checkPermission()async{
bool serviceEnabled ;
LocationPermission permission;
serviceEnabled = await Geolocator.isLocationServiceEnabled();
if(!serviceEnabled){
log("",error: "Location service is not enabled");
}
permission = await Geolocator.checkPermission();
if(permission == LocationPermission.denied){
permission = await Geolocator.requestPermission();
if(permission == LocationPermission.denied){
log("Permission is denied again ");
}
}
if(permission == LocationPermission.deniedForever){
log("",error: "Location permission denied forever");
return false;
}
if(permission == LocationPermission.whileInUse || permission == LocationPermission.always){
return true;
}else{
return false;
}
}
}
import 'dart:developer';
import 'dart:isolate';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:g_map/isolates/current_location_in_background.dart';
import 'package:g_map/services/location_permission.dart';
import 'package:geocoding/geocoding.dart';
// import 'package:geolocator/geolocator.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
// import 'package:geolocator/geolocator.dart';
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage>{
late GoogleMapController _mapController;
final TextEditingController _searchAddressController = TextEditingController();
final _locationPermission = GLocationPermission();
String searchedAddress = "";
late ReceivePort _receivePort;
late Isolate _isolate;
#override
void initState() {
_checkPermission();
super.initState();
}
Future<void> _checkPermission()async{
if(await _locationPermission.checkPermission() == true){
createIsloate();
}
}
Future<void> createIsloate()async{
_receivePort = ReceivePort();
_isolate = await Isolate.spawn(CurrentLocationInBackGround.getLocation, _receivePort.sendPort);
_receivePort.listen((message) {
log("message $message");
// final pos = message as Stream;
// pos.listen((event) {
// log("Event $event");
// });
},
onError: (error){
log("Error $error",error: error);
}
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Stack(
children: [
_googleMap(
inititalCameraPosition: const CameraPosition(
target: LatLng(37.42796133580664, -122.085749655962),
)),
_searchAddressField(context: context)
],
));
}
Widget _googleMap({required CameraPosition inititalCameraPosition}) {
// buildWhen: (previous, current) => current.runtimeType == ,
return GoogleMap(
// minMaxZoomPreference: const MinMaxZoomPreference(1, 20),
zoomControlsEnabled: true,
onMapCreated: _onMapCreated,
myLocationButtonEnabled: true,
initialCameraPosition: inititalCameraPosition,
);
}
Widget _searchAddressField({required BuildContext context}){
return Card(
child: SizedBox(
width: double.infinity,
height: MediaQuery.of(context).size.height*.07,
child: Center(
child: TextField(
onChanged: (value){
// searchedAddress = context.read<GooglemapCubit>().searchAddress(address: value);
},
controller: _searchAddressController,
decoration: InputDecoration(border: InputBorder.none,
suffix: IconButton(onPressed:() => _searchAndNavigate(context: context), icon: const Icon(Icons.search))
),
),
),
),
);
}
Future<void> _searchAndNavigate({required BuildContext context})async{
final location = GeocodingPlatform.instance.locationFromAddress(_searchAddressController.text);
location.then((value){
debugPrint(value[0].latitude.toString());
debugPrint(value[0].longitude.toString());
_mapController.animateCamera(CameraUpdate.newCameraPosition(CameraPosition(
zoom: 12,
target:LatLng(value[0].latitude, value[0].longitude))));
});
}
void _onMapCreated(GoogleMapController controller) {
// _mapController = context.read<GooglemapCubit>().assignControllerOn(controller);
_mapController = controller;
}
}
import 'dart:developer';
import 'dart:isolate';
import 'package:geolocator/geolocator.dart';
class CurrentLocationInBackGround{
static void getLocation(SendPort sendPort)async{
final pos = await Geolocator.getCurrentPosition();
log("pos stream $pos");
sendPort.send(pos);
}
}

Answer 1

I think you tried to run geocoding methods on isolate because it's freezer the main thread
await placemarkFromCoordinates()
or
await locationFromAddress()
will freeze the main thread this bug on there repository
but here is a great solution
link to solution