Managing State in Flutter

Sep 22 2022 · Dart 2.17, Flutter 3.0, Android Studio Chipmunk

Part 1: Understand State Management

04. Use Set State

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00:01One of the first tools in your state management toolkit is setState. This is a method defined the state class. When you call setState, you pass in a void callback which is called right away. This callback should only contain changes that affect any changes to current state. Everything else should be placed outside of the set state callback.

import 'models/pillar.dart';

final pillarData = Pillar(type: PillarType.flutter, articleCount: 115);

import '../models/pillar.dart';

  final Pillar pillar;
  const TutorialWidget({required this.pillar, super.key});

import '../models/pillar.dart';
final Pillar pillar;
const TutorialsPage({required this.pillar, super.key});

children: <Widget>[
  Center(child: TutorialWidget(pillar: widget.pillar)),
  const Padding(

body: TutorialsPage(pillar: pillarData),

setState(() {
  widget.pillar.increaseArticleCount();
});

Image.asset('assets/images/${widget.pillar.type.imageName}', width: 110, height: 110),

Positioned(
          bottom: 2,
          child: CircleAvatar(
            backgroundColor: Colors.blue,
            child: Text(widget.pillar.articleCount.toString()),
          ),
        )

Padding(
          padding: const EdgeInsets.only(top: 24.0),
          child: Text(
            'Total Tutorials: ${widget.pillar.articleCount}',
            style: const TextStyle(fontSize: 30, fontWeight: FontWeight.bold),
          ),
        )