Bloc doesn't provide the state flutter - flutter

Question

I am new to Flutter, and bloc too. I got the idea, how bloc works. But When I create a simple app as the first step of my note app. The bloc doesn't give the data. This simple app has two screens. list screen and Notedetailscreen. Button in NoteDetailScreen tapped, data does not print to the text widget.
main.dart
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:note_demo_bloc/bloc/note_bloc.dart';
import 'package:note_demo_bloc/list_screen.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return BlocProvider<NoteBloc>(
create: (context) => NoteBloc(),
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: ListScreen(),
),
);
}
}
note_bloc.dart
import 'dart:async';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:meta/meta.dart';
part 'note_event.dart';
part 'note_state.dart';
class NoteBloc extends Bloc<NoteblocEvent, NoteblocState> {
NoteBloc() : super(NoteblocInitial());
#override
Stream<NoteblocState> mapEventToState(
NoteblocEvent event,
) async* {
if (event == NoteSaveEvent) {
yield NoteSaveState(state);
}
}
}
part of 'note_bloc.dart';
#immutable
abstract class NoteblocEvent {}
class NoteSaveEvent extends NoteblocEvent {
NoteSaveEvent(this.text);
final text;
}
note_state.dart
part of 'note_bloc.dart';
#immutable
abstract class NoteblocState {}
class NoteblocInitial extends NoteblocState {}
class NoteSaveState extends NoteblocState {
NoteSaveState(this.text);
final text;
}
list_screen.dart
import 'package:flutter/material.dart';
import 'package:note_demo_bloc/note_detail_screen.dart';
class ListScreen extends StatefulWidget {
const ListScreen({Key? key}) : super(key: key);
#override
_ListScreenState createState() => _ListScreenState();
}
class _ListScreenState extends State<ListScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Text('hi'),
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => NoteDetailScreen(),
),
);
},
),
);
}
}
Note_detailscreen.dart
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:note_demo_bloc/bloc/note_bloc.dart';
class NoteDetailScreen extends StatefulWidget {
const NoteDetailScreen({Key? key}) : super(key: key);
#override
_NoteDetailScreenState createState() => _NoteDetailScreenState();
}
class _NoteDetailScreenState extends State<NoteDetailScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
ElevatedButton(
onPressed: () {
BlocProvider.of<NoteBloc>(context).add(NoteSaveEvent('hi'));
},
child: Text('click'),
),
BlocBuilder<NoteBloc, NoteblocState>(
builder: (context, state) {
return Text(state.toString());
},
)
],
),
);
}
}

Answer 1

Your bloc, state, and event looks fine. When you push screen you might need to use BlocProvider again. So try this:
main.dart
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:note_demo_bloc/bloc/note_bloc.dart';
import 'package:note_demo_bloc/list_screen.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
NoteBloc _noteBloc = NoteBloc();
#override
Widget build(BuildContext context) {
return BlocProvider<NoteBloc>(
create: (context) => _noteBloc(),
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: ListScreen(),
),
);
}
}
list_screen.dart
import 'package:flutter/material.dart';
import 'package:note_demo_bloc/note_detail_screen.dart';
class ListScreen extends StatefulWidget {
const ListScreen({Key? key}) : super(key: key);
#override
_ListScreenState createState() => _ListScreenState();
}
class _ListScreenState extends State<ListScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Text('hi'),
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => BlocProvider.value(value: BlocProvider.of<NoteBloc>(context), child: NoteDetailScreen()),
),
);
},
),
);
}
}
Note_detailscreen.dart
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:note_demo_bloc/bloc/note_bloc.dart';
class NoteDetailScreen extends StatefulWidget {
const NoteDetailScreen({Key? key}) : super(key: key);
#override
_NoteDetailScreenState createState() => _NoteDetailScreenState();
}
class _NoteDetailScreenState extends State<NoteDetailScreen> {
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: [
ElevatedButton(
onPressed: () {
BlocProvider.of<NoteBloc>(context).add(NoteSaveEvent('hi'));
},
child: Text('click'),
),
BlocBuilder<NoteBloc, NoteblocState>(
bloc: BlocProvider.of<NoteBloc>(context),
builder: (context, state) {
return Text(state.toString());
},
)
],
),
);
}
}

Answer 2

So, this is not an answer of your question but consider that as alternative (for future users of SO).
As state management is a free choice, and everyone could manage that as it’s “modus operandi“ this helper class “home made” could be a good choice.
import 'dart:async';
import 'dart:core';
class Method {
Method(this.name, this.params);
final String name;
final Map<String, Object> params;
}
class _Controller {
_Controller._();
static final Map<String, _Controller> _this = new Map<String, _Controller>();
final Map<String, Function(Method)> _funcs = new Map<String, Function(Method)>();
factory _Controller(String identifier) => _this.putIfAbsent(identifier, () => _Controller._());
Future<void> activateListener(String listenerId, Function(Method) function) async {
if (function != null)
_funcs.containsKey(listenerId) ? _funcs[listenerId] = function : _funcs.putIfAbsent(listenerId, () => function);
}
Future<void> deactivateListener(String listenerId) async =>
_funcs.removeWhere((String key, Function(Method) func) => key == listenerId);
Future<void> removeListener(String identifier) async =>
_this.removeWhere((String key, _Controller mClass) => key == identifier);
Future<void> callMethod(String methodName, {Map<String, Object> params}) async =>
Future.forEach(_funcs.values.where((v) => v != null), (func) async => func.call(Method(methodName, params)));
}
mixin MethodListener on Object {
_Controller _getController(String identifier) => _Controller(identifier ?? this.runtimeType.toString());
Future<void> activateListener({String identifier, List<String> identifiers}) async {
if (identifiers != null && identifiers.length > 0)
identifiers.forEach(
(String currentId) => _getController(currentId).activateListener(this.hashCode.toString(), onMethodListener));
else
_getController(identifier).activateListener(this.hashCode.toString(), onMethodListener);
}
Future<void> deactivateListener({String identifier, List<String> identifiers}) async {
if (identifiers != null && identifiers.length > 0)
identifiers.forEach((String currentId) => _getController(currentId).deactivateListener(this.hashCode.toString()));
else
_getController(identifier).deactivateListener(this.hashCode.toString());
}
Future<void> removeListener({String identifier}) async => _getController(identifier).removeListener(identifier);
void onMethodListener(Method method) async => null;
Future<void> callMethodOn(String identifier, String methodName, {Map<String, Object> params}) async =>
_getController(identifier).callMethod(methodName, params: params);
}
class MethodManager with MethodListener {
MethodManager._();
static MethodManager _this;
factory MethodManager() {
if (_this == null) _this = MethodManager._();
return _this;
}
Future<void> callMethodOnWidgets(List<String> identifiers, String methodName, {Map<String, Object> params}) async =>
identifiers.forEach((String currentId) => callMethodOn(currentId, methodName, params: params));
#override
Future<void> callMethodOn(String identifier, String methodName, {Map<String, Object> params}) async =>
super.callMethodOn(identifier, methodName, params: params);
}
then you can implements classes with “with MethodListener” as follows:
import 'package:flutter/material.dart';
import 'package:yourpackagehere/utils/XMethods.dart';
class Test extends StatefulWidget {
static const String NAME = "Test";
#override
createState() => _TestState();
}
class _TestState extends State<Test> with MethodListener {
String _ciao;
#override
void initState() {
super.initState();
this.activateListener(identifier: Test.NAME);
}
#override
void dispose() {
this.deactivateListener(identifier: Test.NAME);
super.dispose();
}
#override
Widget build(BuildContext context) {
return Container(child: Text(_ciao));
}
#override
void onMethodListener(Method method) {
switch (method.name) {
case "say_hello":
if (mounted) {
setState(() {
_ciao = method.params["my_string"];
});
}
break;
}
}
}
Usage:
From everywhere (from widgets or classes):
MethodManager().callMethodOn(Test.NAME, "say_hello", params: {"my_string": "SIAMO CAMPIONI DI EUROPA!!!"});