Flutter – Animated Navigation

28 Jul, 2021
By default, Flutter has no animation when navigating from one Screen to another Screen. But in this tutorial, we are going to learn how to animate the Screen Transition.
Before directly applying to your existing project, practice the code in some example projects. For this tutorial, we are going to name our project screen_animation_tutorial. Open in VSCode or Android Studio.
After that, we will make two Screens. The first Screen will be the Starting screen and the next Screen will be the Final Screen. So go ahead and create two dart files under the lib folder.
The main.dart file code should look like this
Dart
import 'package:flutter/material.dart';import 'package:screen_animation_tutorial/start_screen.dart';  void main() {  runApp(MyApp());}  class MyApp extends StatelessWidget {      // This widget is the root of your application.  @override  Widget build(BuildContext context) {    return MaterialApp(      title: 'GeeksForGeeks',      theme: ThemeData(        primarySwatch: Colors.green,      ),      home: StartScreen(),    );  }}
The start_screen.dart should look like this.
Dart
import 'package:flutter/material.dart';import 'package:screen_animation_tutorial/final_screen.dart';  class StartScreen extends StatelessWidget {  const StartScreen({Key? key}) : super(key: key);    @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('GeeksForGeeks'),      ),      body: Container(        color: Colors.yellow[200],        child: Center(          child: Column(            mainAxisAlignment: MainAxisAlignment.center,            children: [              Text(                'Start',                style: TextStyle(fontSize: 48.0),              ),              ElevatedButton(                onPressed: () {                  Navigator.push(                    context,                    MaterialPageRoute(                      builder: (_) => FinalScreen(),                    ),                  );                },                child: Text(                  'Final',                  style: TextStyle(                    fontSize: 32.0,                    fontWeight: FontWeight.w700,                  ),                ),              ),            ],          ),        ),      ),    );  }}
The final_screen.dart should look like this.
Dart
import 'package:flutter/material.dart';  class FinalScreen extends StatelessWidget {  const FinalScreen({Key? key}) : super(key: key);    @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('GeeksForGeeks'),      ),      body: Container(        color: Colors.red[200],        child: Center(          child: Text(            'Final',            style: TextStyle(fontSize: 48.0),          ),        ),      ),    );  }}
Run the app. It should look as below:
Screen Navigation without Animation
Now we will implement the animation.
So in the start_screen.dart we have put the code for navigation inside the ElevatedButton widget. 
Dart
onPressed: () {  Navigator.push(    context,    MaterialPageRoute(      builder: (_) => FinalScreen(),    ),  );},
Replace the MaterialPageRoute with PageRouteBuilder. It creates a Route that delegates to builder callbacks.
Dart
PageRouteBuilder(  pageBuilder: (BuildContext context,                Animation<double> animation,                Animation<double> secondaryAnimation) {},  ),);
Inside the pageBuilder curly braces we the return Final Screen.
Dart
pageBuilder: (BuildContext context,              Animation<double> animation,              Animation<double> secondaryAnimation) {  return FinalScreen();},
Now add transitionBuilder in the PageRouteBuilder.
Dart
transitionsBuilder:    (context, animation, secondaryAnimation, child) {},
Now it is the most interesting part.
Here we will put how do we want our animation. So I want pop-in animation. So I am going to use ScaleTransition. If you want the Scrolling animation you can use Sliding Animation. You can use a bunch of animation with Flutter. Go ahead and try out all. Here I am going to use ScaleTranstion.
Dart
transitionsBuilder:(context, animation, secondaryAnimation, child) {  return ScaleTransition(    alignment: Alignment.center,    scale: Tween<double>(begin: 0.1, end: 1).animate(      CurvedAnimation(        parent: animation,        curve: Curves.bounceIn,      ),    ),    child: child,  );},
Here we can also use custom duration using the transitionDuration field.
Dart
transitionDuration: Duration(seconds: 2),
So we have completed the tutorial. The basic types of animation are:
FadeTransitionSizeTransitionAlignTransitionScaleTransitionPositionedTransition
FadeTransition
SizeTransition
AlignTransition
ScaleTransition
PositionedTransition
Here is the full code of start_screen.dart in case you missed or couldn’t follow.
Dart
import 'package:flutter/material.dart';import 'package:screen_animation_tutorial/final_screen.dart';  class StartScreen extends StatelessWidget {  const StartScreen({Key? key}) : super(key: key);    @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('GeeksForGeeks'),      ),      body: Container(        color: Colors.yellow[200],        child: Center(          child: Column(            mainAxisAlignment: MainAxisAlignment.center,            children: [              Text(                'Start',                style: TextStyle(fontSize: 48.0),              ),              ElevatedButton(                onPressed: () {                  Navigator.push(                    context,                    PageRouteBuilder(                      transitionsBuilder:                          (context, animation, secondaryAnimation, child) {                        return ScaleTransition(                          alignment: Alignment.center,                          scale: Tween<double>(begin: 0.1, end: 1).animate(                            CurvedAnimation(                              parent: animation,                              curve: Curves.bounceIn,                            ),                          ),                          child: child,                        );                      },                      transitionDuration: Duration(seconds: 2),                      pageBuilder: (BuildContext context,                          Animation<double> animation,                          Animation<double> secondaryAnimation) {                        return FinalScreen();                      },                    ),                  );                },                child: Text(                  'Final',                  style: TextStyle(                    fontSize: 32.0,                    fontWeight: FontWeight.w700,                  ),                ),              ),            ],          ),        ),      ),    );  }}
Output:
Screen Navigation with Animation
Hope you enjoyed the tutorial and learned something new. If you have any problems comment below.
android
Flutter UI-components
Dart
Flutter
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