streaming error when moving to another screen in my app, flutter - flutter

Question

I am having an issue with flutter stream. I am using objectbox to store my data but the problem seems to be with flutter streaming. here is my class for objectbox
import 'package:finsec/features/dashboard/data/datasources/InheritedProvider.dart';
import 'package:finsec/features/income/data/models/Income.dart';
import '../../../../objectbox.g.dart';
import 'dart:async';
class ObjectBox {
/// The Store of this app.
late final Store store;
late final Box<Income> incomeBox;
/// A stream of all notes ordered by date.
late final Stream<Query<Income>> incomeQueryStream;
late final qBuilder;
ObjectBox._create(this.store) {
// Add any additional setup code, e.g. build queries.
incomeBox = Box<Income>(store);
qBuilder = incomeBox.query(Income_.monthNumber.equals(0) & Income_.calendarYear.equals(0));
incomeQueryStream = qBuilder.watch(triggerImmediately: true);
}
/// Create an instance of ObjectBox to use throughout the app.
static Future<ObjectBox> create() async {
// Future<Store> openStore() {...} is defined in the generated objectbox.g.dart
final store = await openStore();
return ObjectBox._create(store);
}
}
here is partial code from my main class on how i call the object box class :
Future<void> main() async {
// This is required so ObjectBox can get the application directory
// to store the database in.
WidgetsFlutterBinding.ensureInitialized();
objectBox = await ObjectBox.create();
runApp(new MyHomePage( initialDate: DateTime.now()));
}
in the main home screen, i click a button which takes to another page which display my data from my database. here is partial code from my class
class IncomeTransaction extends StatefulWidget {
IncomeTransaction(
this.outstanding,
this.received_or_paid,
this.monthYear,
this.isSearch,
) ;
final String outstanding , received_or_paid;
bool isSearch;
MonthYear monthYear;
#override
State<StatefulWidget> createState() {
return IncomeTransactionState();
}
}
class IncomeTransactionState extends State<IncomeTransaction> {
int count = 0;
final String assetName = 'assets/images/exclamation_sign.svg';
final _listController = StreamController<List<Income>>.broadcast(sync: true);
//StreamController<List<Income>> _listController = new BehaviorSubject();
#override
void initState() {
super.initState();
setState(() {
_listController.addStream(objectBox.incomeQueryStream.map((q) {
q.param(Income_.monthNumber).value = widget.monthYear.monthNumber;
q.param(Income_.calendarYear).value = widget.monthYear.year;
return q.find();
}));
});
}
#override
void dispose() {
_listController.close();
super.dispose();
}
this is how i call the stream controller
Widget incomeSummaryStream() {
return StreamBuilder<List<Income>>(
stream: _listController.stream,
builder: (context, snapshot) {
final activeIncomes = snapshot.data;
if (!snapshot.hasData || activeIncomes!.length == 0) {
return Align(
alignment: Alignment.center,
child: noData()
);
}
return itemList(activeIncomes);
},
);
}
The app works as follow. here is my main screen with has a menu
when i clicked on Income Budget on the menu of the main screen, it goes to another screen which display a message since there is no data in the database.
so far this is good and there is no error. when I click on the menu of the top left corner and click on Home Screen link, it takes me back to the home screen but i get an error in android studio
Bad state: You cannot close the subject while items are being added from addStream
When the exception was thrown, this was the stack:
#0 Subject.close (package:rxdart/src/subjects/subject.dart:146:7)
#1 IncomeTransactionState.dispose (package:finsec/features/income/presentation/pages/income_transactions.dart:75:21)
#2 StatefulElement.unmount (package:flutter/src/widgets/framework.dart:4818:11)
#3 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1883:13)
#4 ListIterable.forEach (dart:_internal/iterable.dart:39:13)
#5 _InactiveElements._unmountAll (package:flutter/src/widgets/framework.dart:1892:25)
#6 BuildOwner.finalizeTree.<anonymous closure> (package:flutter/src/widgets/framework.dart:2837:27)
#7 BuildOwner.lockState (package:flutter/src/widgets/framework.dart:2468:15)
#8 BuildOwner.finalizeTree (package:flutter/src/widgets/framework.dart:2836:7)
#9 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:884:19)
#10 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
#11 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1145:15)
#12 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#13 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
#17 _invoke (dart:ui/hooks.dart:150:10)
#18 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5)
#19 _drawFrame (dart:ui/hooks.dart:114:31)
(elided 3 frames from dart:async)
this error is pointing to the following line in dispose() function
_listController.close();
if i remove the function dispose() and run the application and do the same steps as stated above, i get a different error
The following StateError was thrown building StreamBuilder<dynamic>(state: _StreamBuilderBaseState<dynamic, AsyncSnapshot<dynamic>>#fa4d5):
Bad state: Stream has already been listened to.
The relevant error-causing widget was:
StreamBuilder<dynamic> StreamBuilder:file:///C:/Users/Tato/Desktop/finsec/lib/main.dart:180:19
When the exception was thrown, this was the stack:
#6 Subject.addStream (package:rxdart/src/subjects/subject.dart:105:12)
#7 IncomeTransactionState.initState.<anonymous closure> (package:finsec/features/income/presentation/pages/income_transactions.dart:63:23)
#8 State.setState (package:flutter/src/widgets/framework.dart:1088:30)
#9 IncomeTransactionState.initState (package:finsec/features/income/presentation/pages/income_transactions.dart:51:5)
#10 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4728:57)
#11 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4561:5)
#12 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3631:14)
#13 Element.updateChild (package:flutter/src/widgets/framework.dart:3380:20)
#14 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#15 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#16 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#17 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#18 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#19 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#20 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#21 StatelessElement.update (package:flutter/src/widgets/framework.dart:4669:5)
#22 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#23 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#24 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#25 ProxyElement.update (package:flutter/src/widgets/framework.dart:4943:5)
#26 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#27 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#28 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#29 ProxyElement.update (package:flutter/src/widgets/framework.dart:4943:5)
#30 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#31 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5626:32)
#32 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6284:17)
#33 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#35 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#36 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#37 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#38 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#39 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#40 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#41 ProxyElement.update (package:flutter/src/widgets/framework.dart:4943:5)
#42 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#43 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#44 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#45 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#46 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#47 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#48 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6130:14)
#49 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#50 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#51 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#52 StatelessElement.update (package:flutter/src/widgets/framework.dart:4669:5)
#53 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#54 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6130:14)
#55 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#56 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#57 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#58 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#59 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#60 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#61 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#62 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#63 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#64 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#65 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#66 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#67 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#68 ProxyElement.update (package:flutter/src/widgets/framework.dart:4943:5)
#69 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#70 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#71 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#72 StatelessElement.update (package:flutter/src/widgets/framework.dart:4669:5)
#73 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#74 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#75 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#76 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#77 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#78 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#79 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#80 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#81 ProxyElement.update (package:flutter/src/widgets/framework.dart:4943:5)
#82 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#83 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#84 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#85 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#86 StatefulElement.update (package:flutter/src/widgets/framework.dart:4795:5)
#87 Element.updateChild (package:flutter/src/widgets/framework.dart:3370:15)
#88 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4613:16)
#89 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4763:11)
#90 Element.rebuild (package:flutter/src/widgets/framework.dart:4311:5)
#91 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2578:33)
#92 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:882:21)
#93 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
#94 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1145:15)
#95 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#96 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
#100 _invoke (dart:ui/hooks.dart:150:10)
#101 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5)
#102 _drawFrame (dart:ui/hooks.dart:114:31)
(elided 9 frames from dart:async)
this error points to setState(() in void initState() function.
can someone help me and let me know how to change my code so that it works without errors? I want to be able to pass parameters to IncomeTransactions class so that they can be used in the following stream
_listController.addStream(objectBox.incomeQueryStream.map((q) {
q.param(Income_.monthNumber).value = widget.monthYear.monthNumber;
q.param(Income_.calendarYear).value = widget.monthYear.year;
the stream should display the data based on the parameters passed to the query. if i go to another screen, the stream should not give me those errors mentioned above.
i tried changing broadcast stream controller to this
StreamController<List<Income>> _listController = new BehaviorSubject();
but it didnt work either. please help. thanks in advance