State Management

 State Management

State management is an important topic in Flutter development, as it determines how your app responds to user input and changes in the data model. Flutter provides several options for managing state, including setState(), InheritedWidget, and third-party packages like Provider. Here's an example of how to use setState() to manage state in a simple app:

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import 'package:flutter/material.dart';

class CounterApp extends StatefulWidget {

  @override

  _CounterAppState createState() => _CounterAppState();

}

class _CounterAppState extends State<CounterApp> {

  int _counter = 0;

  void _incrementCounter() {

    setState(() {

      _counter++;

    });

  }

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text('Counter App'),

      ),

      body: Center(

        child: Text('$_counter'),

      ),

      floatingActionButton: FloatingActionButton(

        onPressed: _incrementCounter,

        tooltip: 'Increment',

        child: Icon(Icons.add),

      ),

    );

  }

}

This app displays a counter that can be incremented using a floating action button. The setState() method is called when the button is pressed, which updates the value of the counter and triggers a rebuild of the UI.