Flutter Bloc state does not update no matter what - flutter

Question

I am currently trying to learn state management for flutter and i have the below code, but for some reason the state is never updated, am i missing something?
import 'package:equatable/equatable.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: BlocProvider(
create: (context) => ItemBloc(),
child: MyHomePage(),
),
);
}
}
class MyHomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Bloc Demo"),
),
body: Lister(),
floatingActionButton: FloatingActionButton(
onPressed: () {
ItemBloc().add(AddEvent());
},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class Lister extends StatelessWidget {
#override
Widget build(BuildContext context) {
return BlocBuilder<ItemBloc, ListState>(
builder: (context, state) {
if (state is ListAdded) {
return ListView.builder(
itemCount: state.items.length,
itemBuilder: (context, index) {
return Text("item"); // This never increases in count
},
);
}
return Center(
child: Text('err'),
);
},
);
}
}
// BLOC
class ItemBloc extends Bloc<ListEvent, ListState> {
#override
get initialState => ListAdded(items: ["initial"]);
#override
Stream<ListState> mapEventToState(ListEvent event) async* {
if (event is AddEvent) {
final lister = ["first", "second"];
yield ListAdded(items: lister);
}
}
}
abstract class ListEvent extends Equatable {
#override
List<Object> get props => [];
}
class AddEvent extends ListEvent {}
abstract class ListState extends Equatable {
const ListState();
#override
List<Object> get props => [];
}
class ListAdded extends ListState {
final List<String> items;
const ListAdded({
this.items,
});
#override
List<Object> get props => [items];
#override
String toString() => 'ItemsLoaded { items: ${items.length} }';
}
Please note: I have tried separating the code into individual files and importing the bloc.dart package instead of flutter_bloc.dart package in the Bloc file

Answer 1

When you do
ItemBloc().add(AddEvent())
you're creating new bloc instance and add event to it. It isn't connected with one created in MyApp and used in Lister.
You should get the created bloc instead:
BlocProvider.of<ItemBloc>(context).add(AddEvent())