Why navigation manages screen transitions in Flutter

Introduction

Navigation helps move between different screens in an app smoothly. It keeps track of where you are and where you want to go next.

When you want to open a new screen after a button tap.

When you need to go back to the previous screen.

When switching between different sections of an app.

When showing details from a list on a new page.

When closing a screen and returning data to the previous one.

Syntax

Flutter

Navigator.of(context).push(MaterialPageRoute(builder: (context) => NewScreen()));
Navigator.of(context).pop();

Use Navigator.of(context).push to go to a new screen.

Use Navigator.of(context).pop to go back to the previous screen.

Examples

This code moves from the current screen to a DetailScreen.

Flutter

Navigator.of(context).push(MaterialPageRoute(builder: (context) => DetailScreen()));

This code goes back to the previous screen.

Flutter

Navigator.of(context).pop();

Sample App

This app has two screens. The first screen has a button to go to the second screen. The second screen has a button to go back.

Flutter

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home')),
      body: Center(
        child: ElevatedButton(
          child: Text('Go to Second Screen'),
          onPressed: () {
            Navigator.of(context).push(
              MaterialPageRoute(builder: (context) => SecondScreen()),
            );
          },
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Second Screen')),
      body: Center(
        child: ElevatedButton(
          child: Text('Go Back'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ),
    );
  }
}

Important Notes

Navigation keeps a stack of screens, like a stack of cards.

Push adds a new screen on top; pop removes the top screen.

This helps users move forward and backward easily.

Summary

Navigation controls moving between screens in an app.

Use Navigator.of(context).push to open a new screen.

Use Navigator.of(context).pop to go back to the previous screen.