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flutter refresh page on back

How to refresh a page or widget on navigation pop/back in flutter ?

Aman Jain, April 28, 2022November 5, 2023

Sometime in out application we want to refresh a page or widget on navigation pop/back in flutter because we want to update the state of our page so users can see the latest update based on their actions. So In this article I will show you to flutter refresh page on back.

In Flutter application we heavily use Navigator APIs to navigate between the pages, in some scenarios we need to update the screen on pop so we can show the latest data. in this article we will learn to refresh the screen using two methods as follow

Method 1 : Flutter Refresh page on back using async await on Navigator push

In this method we will use async await to update the page, flutter provides promise on complete of navigator function so we can wait for the completion of navigation and update the screen using async await as below

Step 1 : Create flutter project

Very first step is to create the fluter application using command line tool or in Android studio.

flutter create example_app

This will create a new project with name my_app then go in to the folder.

Step 2 : Create two widgets for navigation

Now, Create two widgets to navigate between the pages. Let’s create one widget name as Home and Second as Products . From home screen we will pass params to it and will access it to another page which is Products.

File : lib/Home.dart

class Home extends StatelessWidget {
   const Home({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return  Scaffold(
      appBar: AppBar(
        title: const Text('Home'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text("Home Screen"),
              Text("Home Screen Count "+ count.toString()),
            ElevatedButton(onPressed: () async {
               await Navigator.pushNamed(context, '/Products',arguments:{"id":1,"name":"apple"});
               //do your stuff after completion of navigator
               
             }, child: const Text("Navigate to Apple")),

            ElevatedButton(onPressed: (){
               Navigator.pushNamed(context, '/Products',arguments:{"id":2,"name":"Nokia"});
            }, child: const Text("Navigate to Nokia"))
          ],
        ),
      ),
    );
  }
}

Here we used Navigator.push to navigate to another page which is Products and also used Scaffold for material mobile design. As you can see we used arguments to pass the params to another page.

and used async await here

 ElevatedButton(onPressed: () async {
               await Navigator.pushNamed(context, '/Products',arguments:{"id":1,"name":"apple"});
               //do your stuff after completion of navigator
               
             }

lib/Products.dart

class Products extends StatelessWidget {
  const Products({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {

    Map arguments = ModalRoute.of(context)?.settings.arguments as Map;

    return  Scaffold(
      appBar: AppBar(
        title:  Text('Product ${arguments['name']}'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
             Text("${arguments['name']} and id ${arguments['id']}"),
            ElevatedButton(onPressed: (){
              Navigator.pop(context);
            }, child: const Text("Navigate back"))
          ],
        ),
      ),
    );
  }
}

We used here Navigator.pop to go back to the last page.

Step 3 : Add Routing widget

Now create routing for these two pages using MaterialApp. As you can see in below example we have created two routes / to access the home screen and /Products to access the products page.

We also create builder using Navigator and in Navigator we implemented onGenerateRoute to create MaterialPageRoute to access the params between pages.

class AppRouter extends StatelessWidget {
  const AppRouter({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Named Routes Demo',

      \\this is optional
        builder: (context, widget) => Navigator(
              onGenerateRoute: (RouteSettings settings) => MaterialPageRoute(
                builder: (ctx) {
                  return Container(
                    child: widget,
                  );
                },
              ),
            ),
  \\this is optional
        initialRoute: '/',
        routes: {
          '/': (context) => const Home(),
          '/Products': (context) => const Products(),
        });
  }
}

Step 4 : Add Page to main file

Simply run the project using command line or in android studio to check the implementation.

import 'package:flutter/material.dart';
import 'package:example_app/AppRouter.dart';
import 'package:example_app/Home.dart';
import 'package:example_app/Products.dart';

void main() {
  runApp(const AppRouter());
}

Method 2 : Refresh page RouteObserver and RouteAware to get the Navigator events in widget

In this method we will use RouteObserver and RouteAware to the widget. RouteObserver provides events of navigator apis in widget so we can implement RouteAware methods in our widget.

In this example we will create routing, two widgets as above but also a service so we can create RouteObserver in that service and use it across the widgets as below

Step 1 : Create a class

Let’s create a simple class named as Helper so that we can use it across multiple files

import 'package:flutter/material.dart';

class Helper  {
 static final RouteObserver<PageRoute> _routeObserver = RouteObserver();
}

Step 2 : Update AppRouter Widget

Now update the AppRouter.dart file and add navigatorObservers: [Helper.routeObserver] in

class AppRouter extends StatelessWidget {
  const AppRouter({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Named Routes Demo',
        navigatorObservers: [Helper.routeObserver],
        initialRoute: '/',
        routes: {
          '/': (context) => const HomePage(),
          '/Products': (context) => const Products(),
        });
  }
}

Step 3 : Update Widget and add RouteAware mixing to widget

Now update the AppRouter.dart file and add navigatorObservers: [Helper.routeObserver] in


class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

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

class _HomePageState extends State<HomePage> with RouteAware {

  @override
  void didPush() {
    print('HomePage: Called didPush');
    super.didPush();
  }

  @override
  void didPop() {
    print('HomePage: Called didPop');
    super.didPop();
  }

  @override
  void didPopNext() {
    print('HomePage: Called didPopNext');
    super.didPopNext();
  }

  @override
  void didPushNext() {
    print('HomePage: Called didPushNext');
    super.didPushNext();
  }
  @override
  void initState() {
  WidgetsBinding.instance!.addPostFrameCallback((timeStamp) {
    Helper.routeObserver.subscribe(this, ModalRoute.of(context)!);
  });
  super.initState();
 }
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text("Home Screen"),
            ElevatedButton(
                onPressed: () {
                  Navigator.pushNamed(context, '/Products',
                      arguments: {"id": 1, "name": "apple"});
                },
                child: const Text("Navigate to Apple")),
            ElevatedButton(
                onPressed: () {
                  Navigator.pushNamed(context, '/Products',
                      arguments: {"id": 2, "name": "Nokia"});
                },
                child: const Text("Navigate to Nokia"))
          ],
        ),
      ),
    );
  }
}

Here we added

 @override
  void initState() {
  WidgetsBinding.instance!.addPostFrameCallback((timeStamp) {
    Helper.routeObserver.subscribe(this, ModalRoute.of(context)!);
  });
  super.initState();
 }

and methods

  1.  didPop(): Called when we call pop method of navigator.
  2. didPopNext(): In this method, on the off chance that you have extended HomePage with RouteAware, and in case SecondPage is popped so HomePage is noticeable now, didPopNext is called.
  3. didPush(): called when the current screen or route has been pushed into the navigation stack.
  4. didPushNext(): called when a new screen/route is pushed from the current screen and the current screen is no longer visible.

Check the implementation here and you can check the console for logs

Related

Dart Flutter eventsFlutterrouter

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Aman Jain
Aman Jain

With years of hands-on experience in the realm of web and mobile development, they have honed their skills in various technologies, including Laravel, PHP CodeIgniter, mobile app development, web app development, Flutter, React, JavaScript, Angular, Devops and so much more. Their proficiency extends to building robust REST APIs, AWS Code scaling, and optimization, ensuring that your applications run seamlessly on the cloud.

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