Navigate to a new screen in Flutter

Question

How do you navigate to a new screen in Flutter?

These questions are similar, but are asking more than I am.

• Flutter - Navigate to a new screen, and clear all the previous screens
• Flutter: How do I navigate to a new screen using DropDownMenuItems
• Flutter: Move to a new screen without back
• flutter navigation to new screen not working

I am adding an answer below.

Answer 1

Navigate to a new screen:

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

where context is the BuildContext of a widget and NewScreen is the name of the second widget layout.

Code

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home Screen')),
      body: Center(
        child: RaisedButton(
          child: Text(
            'Navigate to a new screen >>',
            style: TextStyle(fontSize: 24.0),
          ),
          onPressed: () {
            _navigateToNextScreen(context);
          },
        ),
      ),
    );
  }

  void _navigateToNextScreen(BuildContext context) {
    Navigator.of(context).push(MaterialPageRoute(builder: (context) => NewScreen()));
  }
}

class NewScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('New Screen')),
      body: Center(
        child: Text(
          'This is a new screen',
          style: TextStyle(fontSize: 24.0),
        ),
      ),
    );
  }
}

See also

• Documentation
• Navigator and Routes and Transitions... Oh, My! - Simon Lightfoot | Flutter Europe

Answer 2

To load new screens with Flutter pre-canned animations, use their respective transition classes. For example:

Container Transformation

Basically we have the first widget or screen transform into the next screen. For this we need to use OpenContainer. The following code illustrates an item in a ListView transformed to its details page.

  @override
  Widget build(BuildContext context) {
    return Card(
      color: Colors.white,
      elevation: 2.0,
      child: OpenContainer(
        transitionType: ContainerTransitionType.fadeThrough,
        closedColor: Theme.of(context).cardColor,
        closedElevation: 0.0,
        openElevation: 4.0,
        transitionDuration: Duration(milliseconds: 1500),
        openBuilder: (BuildContext context, VoidCallback _) => THENEXTSCREEN(),
        closedBuilder: (BuildContext _, VoidCallback openContainer) {
          return ListTile(
            leading: Icon(Icons.album),
            title: Text("ITEM NAME"),
          );
        },
      ),
    );
  }

Shared Axis

This transition is similar to that in Tab or Stepper. We need SharedAxisTransition, PageTransitionSwitcher, along with a state to model transition between active and previous page. If we only switch between two pages we can use a simple boolean isFirstPage for it. Here's the snippet with Provider as state management:

  @override
  Widget build(BuildContext context) {
    return Consumer<YourState>(
      builder: (context, state, child) {
        return PageTransitionSwitcher(
          duration: const Duration(milliseconds: 1500),
          reverse: !state.isFirstPage, // STATE
          transitionBuilder: (
            Widget child,
            Animation<double> animation,
            Animation<double> secondaryAnimation,
          ) {
            return SharedAxisTransition(
              child: child,
              animation: animation,
              secondaryAnimation: secondaryAnimation,
              transitionType: SharedAxisTransitionType.horizontal,
            );
          },
          child: state.isFirstPage? FIRSTPAGE() : SECONDPAGE(), // STATE
        );
      },
    );
  }

Note that in all these scenarios we don't use Navigator and MaterialPageRoute. All these codes are derived from animations repo so you may want to check it out first.