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With the increasing number of mobile app users across the globe, building an intuitive and engaging user interface (UI) is essential for all modern-day applications. This is where the Shimmer effect steps in, providing a magnificent animation effect that not only enhances the UI but also helps in loading your app's content gracefully. A Shimmer effect in Flutter apps is an unmissable tool in any app developer's kit.
While fetching data from a distant server or even a local database, it often takes time for the actual data to load onto your screen. During this stretching span of time, seeing a static loading message or a mundane loading indicator can affect the user's engagement with the app. Here is where the Shimmer loading effect fits in perfectly. It's a beautiful animation effect that retains user engagement and interaction with the app during data fetch or loading.
Crucial to enhancing users' experience and keeping them entertained while they wait, the shimmer effect provides a friendly and engaging loading animation. Its name comes from the gleaming animation effect it creates, similar to a shimmer. This contributes to the Flutter app's overall aesthetic and improves user patience during data load, causing a positive loading impact. Shimmer, the package enabling this effect in Flutter, is easy to integrate and versatile.
For those who are new to Flutter, it's a comprehensive open-source UI software development kit created by Google. Flutter enables us to build visually stunning, natively compiled mobile, web, and desktop applications from a single piece of Dart code. The framework introduces us to widgets, which are critical units of the app's UI with a distinct purpose. For instance, the widget responsible for providing the padding to its child widget is the Padding widget.
Shimmer is a package that provides a Shimmer widget in Flutter apps. It aims to offer an upgrade to the traditional static loading indicators, bringing a beaming animation effect, hence the name "Shimmer". The subtlety of this Shimmer effect is what makes it an elegant loading solution.
The central idea behind Shimmer is relatively straightforward - the Shimmer widget is first loaded as a placeholder. It is then replaced by the actual content (child widget) once data is received. Shimmer achieves this by creating an animation effect on its gradient, which sweeps from the Shimmer ancestor widget to its children.
Apart from improving aesthetics, Shimmer impacts the perceived loading time. This reduces the chance of users getting impatient when fetching data, thereby improving the overall user experience.
Before you can implement the shimmer effect in your app, you need to set up the development environment. Beginners can download Flutter from the official site, install it as per the documentation's instructions, and set up an editor or Integrated Development Environment (IDE). Please ensure that Flutter and Dart extensions are also installed if you're using editors like VS Code.
To create a new Flutter project, the following command can be run in the terminal:
1 flutter create myapp 2 cd myapp 3
The following code demonstrates how to create a basic Flutter app:
1 void main() { 2 runApp(const MyApp()); 3 } 4 5 class MyApp extends StatelessWidget { 6 const MyApp({Key? key}) : super(key: key); 7 8 @override 9 Widget build(BuildContext context) { 10 return MaterialApp( 11 title: 'Flutter Demo', 12 home: Scaffold( 13 appBar: AppBar( 14 title: Text('Flutter Demo Home Page'), 15 ), 16 body: Center( 17 child: Text('Hello Flutter'), 18 ), 19 ), 20 ); 21 } 22 } 23
This Dart file will render a screen with a single line of text - "Hello Flutter". Developers familiar with Flutter will recognise this as a common base to start with before incorporating more complex functionalities.
Shimmer is a Flutter package that provides the Shimmer widget. This widget is what enables us to create the engaging Shimmer animation in our app. The first step towards adding the shimmer loading effect to your app involves incorporating the Shimmer package.
The official Flutter Shimmer package can be located in the Flutter Package Repository https://pub.dev . By searching "Shimmer " on this site, we can find the package's latest version along with additional details like popularity, pub points, and likes.
Once we have located the Shimmer package, we can move to installing it. For that, add the Shimmer package dependency to your pubspec.yaml file, under dependencies:
1 dependencies: 2 shimmer: ^version 3
Substitute "^version" with the latest version number from the Flutter Package Repository. Running flutter packages get in your terminal, within the project directory, will fetch the package into your project.
Now that we have the package installed, begin by importing the shimmer package at the top of your Dart file:
1 import 'package:shimmer/shimmer.dart'; 2
To use the shimmer widget, wrap your child widget (the one which you want to load with the shimmer effect) with the Shimmer widget. Here's an example of how to do this:
1 Shimmer.fromColors( 2 baseColor: Colors.grey[300], 3 highlightColor: Colors.grey[100], 4 child: Text( 5 'Shimmer Effect', 6 style: TextStyle( 7 fontSize: 40, 8 fontWeight: FontWeight.bold, 9 ), 10 ), 11 ); 12
In the above snippet, 'Shimmer Effect' renders with the shimmer effect.
Shimmer comes with a set of properties that you can tweak to create a custom loading indicator. The interesting part about using Shimmer is experimenting with its properties to create unique effects in your Flutter app.
Two fundamental properties that you can change for Shimmer are baseColor and highlightColor. Both of these help in determining the shades of color that will be used for the shimmer gradient.
Shimmer allows developers to alter the direction of the animation with a few simple changes. The animation's direction is controlled by the 'Direction' property, which accepts four values: RTL (Right to Left), LTR (Left to Right), TTB (Top to Bottom), and BTT (Bottom to Top).
Here's a code snippet that demonstrates the use of the Direction property:
1 Shimmer.fromColors( 2 direction: ShimmerDirection.rtl, 3 baseColor: Colors.grey[300], 4 highlightColor: Colors.grey[100], 5 child: Text( 6 'Shimmer Effect', 7 style: TextStyle( 8 fontSize: 40, 9 fontWeight: FontWeight.bold, 10 ), 11 ), 12 ); 13
In the above code, the ShimmerDirection.rtl makes the Shimmer animation effect from the right to the left of the screen.
Beyond controlling the animation direction, Shimmer also allows us to modify how our shimmering text (or any other child widget) looks. We can define the gradient colors, animation duration, animation curve, and much more.
Here is how you can customise your shimmer animation:
1 Shimmer.fromColors( 2 period: Duration(milliseconds:1500), 3 baseColor: Colors.grey[300], 4 highlightColor: Colors.grey[100], 5 loop: 3, 6 enabled: _enabled, 7 child: Text( 8 'Shimmer Effect', 9 style: TextStyle( 10 fontSize: 40, 11 fontWeight: FontWeight.bold, 12 ), 13 ), 14 ); 15
In this code, the period property specifies the duration of the shimmer animation, loop determines the number of times shimmer animation repeats, and enabled decides whether the Shimmer effect is active.
Adopting best practices in applying the Shimmer effect to your Flutter apps ensures efficient performance and preserves the main goal of Shimmer—to enhance user experience.
The sheer charm of Flutter is its ability to create versatile and attractive applications. Flutter Shimmer is a package that enables us to build a captivating Shimmer Enlivening effect, enhancing user interface aesthetics and engaging users during loading times.
This blog post aims to guide you in integrating the Shimmer loading effect in your Flutter apps, starting from setting up Flutter development to crafting a basic app, bringing life to widgets using the Shimmer effect and applying best practices to optimize visual results.
As a Flutter app developer, knowing how to use the Shimmer effect enriches your toolkit and broadens the array of techniques you can employ to increase user interaction and satisfaction.
