In some cases, you might want to return data from a new screen. For example, say you push a new screen that presents two options to a user. When the user taps an option, you want to inform the first screen of the user's selection so that it can act on that information.

You can do this with theNavigator.pop() method using the following steps:

1. Define the home screen
2. Add a button that launches the selection screen
3. Show the selection screen with two buttons
4. When a button is tapped, close the selection screen
5. Show a snackbar on the home screen with the selection

The home screen displays a button. When tapped, it launches the selection screen.

classHomeScreenextendsStatelessWidget{constHomeScreen({super.key});​@overrideWidgetbuild(BuildContextcontext){returnScaffold(appBar:AppBar(title:constText('Returning Data Demo')),// Create the SelectionButton widget in the next step.body:constCenter(child:SelectionButton()),);}}

Now, create the SelectionButton, which does the following:

• Launches the SelectionScreen when it's tapped.
• Waits for the SelectionScreen to return a result.

classSelectionButtonextendsStatefulWidget{constSelectionButton({super.key});​@overrideState<SelectionButton>createState()=>_SelectionButtonState();}​class_SelectionButtonStateextendsState<SelectionButton>{@overrideWidgetbuild(BuildContextcontext){returnElevatedButton(onPressed:(){_navigateAndDisplaySelection(context);},child:constText('Pick an option, any option!'),);}​Future<void>_navigateAndDisplaySelection(BuildContextcontext)async{// Navigator.push returns a Future that completes after calling// Navigator.pop on the Selection Screen.finalresult=awaitNavigator.push(context,// Create the SelectionScreen in the next step.MaterialPageRoute<String>(builder:(context)=>constSelectionScreen()),);}}

Now, build a selection screen that contains two buttons. When a user taps a button, that app closes the selection screen and lets the home screen know which button was tapped.

This step defines the UI. The next step adds code to return data.

classSelectionScreenextendsStatelessWidget{constSelectionScreen({super.key});​@overrideWidgetbuild(BuildContextcontext){returnScaffold(appBar:AppBar(title:constText('Pick an option')),body:Center(child:Column(mainAxisAlignment:MainAxisAlignment.center,children:[Padding(padding:constEdgeInsets.all(8),child:ElevatedButton(onPressed:(){// Pop here with "Yep"...},child:constText('Yep!'),),),Padding(padding:constEdgeInsets.all(8),child:ElevatedButton(onPressed:(){// Pop here with "Nope"...},child:constText('Nope.'),),),],),),);}}

Now, update theonPressed() callback for both of the buttons. To return data to the first screen, use theNavigator.pop() method, which accepts an optional second argument calledresult. Any result is returned to theFuture in the SelectionButton.

ElevatedButton(onPressed:(){// Close the screen and return "Yep!" as the result.Navigator.pop(context,'Yep!');},child:constText('Yep!'),)

ElevatedButton(onPressed:(){// Close the screen and return "Nope." as the result.Navigator.pop(context,'Nope.');},child:constText('Nope.'),)

Now that you're launching a selection screen and awaiting the result, you'll want to do something with the information that's returned.

In this case, show a snackbar displaying the result by using the_navigateAndDisplaySelection() method inSelectionButton:

// A method that launches the SelectionScreen and awaits the result from// Navigator.pop.Future<void>_navigateAndDisplaySelection(BuildContextcontext)async{// Navigator.push returns a Future that completes after calling// Navigator.pop on the Selection Screen.finalresult=awaitNavigator.push(context,MaterialPageRoute<String>(builder:(context)=>constSelectionScreen()),);​// When a BuildContext is used from a StatefulWidget, the mounted property// must be checked after an asynchronous gap.if(!context.mounted)return;​// After the Selection Screen returns a result, hide any previous snackbars// and show the new result.ScaffoldMessenger.of(context)..removeCurrentSnackBar()..showSnackBar(SnackBar(content:Text('$result')));}

import 'package:flutter/material.dart';void main() {  runApp(const MaterialApp(title: 'Returning Data', home: HomeScreen()));}class HomeScreen extends StatelessWidget {  const HomeScreen({super.key});  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(title: const Text('Returning Data Demo')),      body: const Center(child: SelectionButton()),    );  }}class SelectionButton extends StatefulWidget {  const SelectionButton({super.key});  @override  State<SelectionButton> createState() => _SelectionButtonState();}class _SelectionButtonState extends State<SelectionButton> {  @override  Widget build(BuildContext context) {    return ElevatedButton(      onPressed: () {        _navigateAndDisplaySelection(context);      },      child: const Text('Pick an option, any option!'),    );  }  // A method that launches the SelectionScreen and awaits the result from  // Navigator.pop.  Future<void> _navigateAndDisplaySelection(BuildContext context) async {    // Navigator.push returns a Future that completes after calling    // Navigator.pop on the Selection Screen.    final result = await Navigator.push(      context,      MaterialPageRoute<String>(builder: (context) => const SelectionScreen()),    );    // When a BuildContext is used from a StatefulWidget, the mounted property    // must be checked after an asynchronous gap.    if (!context.mounted) return;    // After the Selection Screen returns a result, hide any previous snackbars    // and show the new result.    ScaffoldMessenger.of(context)      ..removeCurrentSnackBar()      ..showSnackBar(SnackBar(content: Text('$result')));  }}class SelectionScreen extends StatelessWidget {  const SelectionScreen({super.key});  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(title: const Text('Pick an option')),      body: Center(        child: Column(          mainAxisAlignment: MainAxisAlignment.center,          children: <Widget>[            Padding(              padding: const EdgeInsets.all(8),              child: ElevatedButton(                onPressed: () {                  // Close the screen and return "Yep!" as the result.                  Navigator.pop(context, 'Yep!');                },                child: const Text('Yep!'),              ),            ),            Padding(              padding: const EdgeInsets.all(8),              child: ElevatedButton(                onPressed: () {                  // Close the screen and return "Nope." as the result.                  Navigator.pop(context, 'Nope.');                },                child: const Text('Nope.'),              ),            ),          ],        ),      ),    );  }}