导航到 Flutter 中的新屏幕

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

Navigate to next screen with back using Navigator.push()

Navigator.push(
context,
MaterialPageRoute(builder: (context) => SecondRoute()),);

Navigate to next screen without back using Navigator.pushReplacement()

Navigator.pushReplacement(
context,MaterialPageRoute(builder: (context) => SecondRoute()),);

Answer 3

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.

Answer 4

onTap: () {
  Navigator.push(context,
      MaterialPageRoute(builder: (context) => NextScreenName()));
}

Answer 5

If you are familiar with web development this approach is similar to routing.

main.dart

void main() {
  setupLocator();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      routes: {
        '/' : (BuildContext context)=>HomePage(),
        '/register' : (BuildContext context)=>RegisterPage(),
      },
    );
  }
}

You can add button onPressed event from the homepage.dart to navigate register.dart as follows.

onPressed: (){
    Navigator.pushReplacementNamed(context, '/register');
 },

Answer 6

Here is a full example of routes push / pop:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Routes',
      routes: {
        '/login': (BuildContext context) => Login(),
        // add another route here
        // '/register': (BuildContext context) => Register(),
      },
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Routes'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            RaisedButton(
              onPressed: () {
                // This gives the back button:
                Navigator.of(context).pushNamed('/login');

                // This doesn't give the back button (it replaces)
                //Navigator.pushReplacementNamed(context, '/login');
              },
              child: Text('Login'),
            ),
          ],
        ),
      ),
    );
  }
}

class Login extends StatefulWidget {
  @override
  _LoginState createState() => _LoginState();
}

class _LoginState extends State<Login> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Login Page'),
        ),
        body: Center(
          child: RaisedButton(
            onPressed: () {
              // This will only work for pushNamed
              Navigator.of(context).pop();
            },
            child: Text('Go back'),
          ),
        ));
  }
}

Answer 7

您可以尝试使用以下代码

Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => YourNextScreen())),

Answer 8

I found a good tutorial that I have followed along, it is very comprehensive with screenshots and step by step, you can also download the code and just run it. Very helpful for me learning Flutter especially I am totally a begineer.

https://medium.com/@misterflutter/lesson-5-creating-new-screens-f740994190c7

https://medium.com/@misterflutter/lesson-6-creating-new-screens-part-2-4997085a43af?sk=d2a0fb723af42b78800f7cf19b312b62

Answer 9

使用新的Get 插件，您只需调用即可导航到新页面

Get.to(Page());

Answer 10

In formal method :

Navigator.push(context, MaterialPageRoute(builder: (context)=>Second()));

In GetX method :

Get.to(Second());

If we can navigate screen into another page and delete current page from stack then we can use method which is define below :

Get.off(Third());

If we can navigate screen into another page and delete all route or page from stack then we can use the method which is define below :

Get.offAll(Third());

If we want to use Navigator.pop() then GetX give a Method which is define below :

Get.back();

Answer 11

Flutter has a similar implementation, using Navigator and Routes . A Route is an abstraction for a “screen” or “page” of an app, and a Navigator is a widget that manages routes.

To navigate between pages, you have a couple of options:

• Specify a Map of route names.
• Directly navigate to a route.

The following example builds a Map.

void main() {
  runApp(CupertinoApp(
    home: MyAppHome(), // becomes the route named '/'
    routes: <String, WidgetBuilder> {
      '/a': (BuildContext context) => MyPage(title: 'page A'),
      '/b': (BuildContext context) => MyPage(title: 'page B'),
      '/c': (BuildContext context) => MyPage(title: 'page C'),
    },
  ));
}

Navigate to a route by pushing its name to the Navigator.

Navigator.of(context).pushNamed('/b');

The Navigator class handles routing in Flutter and is used to get a result back from a route that you have pushed on the stack. This is done by awaiting the Future returned by push() .

For example, to start a 'location' route that lets the user select their location, you might do the following:

Map coordinates = await Navigator.of(context).pushNamed('/location');

And then, inside your 'location' route, once the user has selected their location, pop() the stack with the result:

Navigator.of(context).pop({"lat":43.821757,"long":-79.226392});

Answer 12

您可以在构建小部件中使用这种方式

onTap: () { Navigator.of(context).push(MaterialPageRoute( builder: (context) => NewScreen()));},

Answer 13

This way you can present the next screen

Navigator.of(context).push(
   MaterialPageRoute(fullscreenDialog: true,
   builder: (context) => const NewScreen(),
   ),
);

Answer 14

FloatingActionButton(
  onPressed: (){
    Navigator.of(context).push(MaterialPageRoute(builder: (context) => const AddUser()));
  },
  child: const Icon(Icons.add),
),