Education
Software Development Executive - II
Last updated onNov 1, 2023
Last updated onAug 9, 2023
Welcome to the Fluttery world! 💙
In today's blog, we will focus on one of the essential components used frequently in app development - the Snackbar. You may have noticed subtle rectangular messages popping up at the bottom of applications providing user feedback. That's precisely what we refer to as Snackbar in Flutter.
Snackbar is a lightweight and ephemeral way to provide brief, auto-expiring messages in response to user action. They're meant to display minor, non-critical pieces of information, and are not intended for persistent or complex messaging. Flutter provides us with rich, customizable Snackbars through the showSnackbar function, allowing developers to provide essential feedback to the users seamlessly.
1 // This is a simple example of a Snackbar in Flutter 2 ScaffoldMessenger.of(context).showSnackBar( 3 SnackBar( 4 content: Text('Hello Snackbar'), 5 ), 6 ); 7
Snackbar, as a widget, is much more than just a feedback tool. It's a gateway to more interactive and user-friendly applications. With its concise and rectangular layout, a Snackbar is perfect for conveying brief affirmations or notices to the user.
You might wonder - aren't Toast, Dialog, and Snackbar somewhat similar? Indeed, they are, but what differentiates Snackbar from Toast and Dialog is its ability to hold an optional action. For instance, if a user accidentally removes an item, a Snackbar could offer an action to undo that operation.
In essence, Snackbar widget in Flutter is superior in providing real-time feedback along with offering unintrusive user actions.
1 /// Example of Snackbar with an action 2 ScaffoldMessenger.of(context).showSnackBar( 3 SnackBar( 4 content: Text('Please wait, loading...'), 5 action: SnackBarAction( 6 label: 'Undo', 7 onPressed: () { 8 // Some code to undo the change 9 }, 10 ), 11 ), 12 ); 13
Before we kickstart our journey into creating Flutter Snackbar, we need to ensure we have the appropriate development environment set up. This involves:
1 // Check your Flutter environment 2 flutter doctor 3
As we dip our toes into the world of Snackbar, understanding its syntax and properties is essential. Let's look at a simple scaffold snackbar Flutter function:
1 // Basic Flutter show Snackbar structure 2 ScaffoldMessenger.of(context).showSnackBar( 3 SnackBar( 4 content: Text('Hello Snackbar'), 5 ), 6 ); 7
Every Snackbar must inhabit content, which is commonly a Text widget. Here, 'Hello Snackbar' is the text that will display in your Snackbar.
There are more properties to Snackbar that allows us to enhance its capability and appearance, such as backgroundColor, behavior, and action. We will look at customizing Snackbars further in upcoming sections.
It's time to put theory into practice by creating our very first Snackbar in Flutter. Begin by creating a new Flutter application or opening an existing one.
Within our Flutter application, we'll need to construct a Scaffold that comprises a Snackbar. Here's a simple function in Flutter to show a Snackbar:
1 // Function to show a Snackbar 2 void showMySnackbar(BuildContext context) { 3 ScaffoldMessenger.of(context).showSnackBar( 4 SnackBar( 5 content: Text('Hello Snackbar!'), 6 ), 7 ); 8 } 9
We can then call this function inside onPressed or any other event handler.
1 // Button to trigger the Snackbar 2 ElevatedButton( 3 onPressed: () { 4 showMySnackbar(context); 5 }, 6 child: Text('Show Snackbar'), 7 ), 8
Being wary of common mistakes is as important as knowing the correct implementation. One such pitfall is forgetting to ensure a Scaffold is an ancestor to the Snackbar.
Let's take our Snackbar components to the next level by implementing advanced customizations.
Firstly, we can personalize the color of Snackbar. Here's an example of a function to show the Snackbar with a custom color:
1 // Function to show a Snackbar with custom color 2 void showMySnackbar(BuildContext context) { 3 ScaffoldMessenger.of(context).showSnackBar( 4 SnackBar( 5 content: Text('This is a customized Snackbar!'), 6 backgroundColor: Colors.pinkAccent, 7 ), 8 ); 9 } 10
Moving on, Snackbar is not just about displaying messages. They can even carry out minor tasks with the help of actions.
Let's build a Snackbar with an action:
1 // This Snackbar would offer an 'Undo' action 2 void showMySnackbar(BuildContext context) { 3 ScaffoldMessenger.of(context).showSnackBar( 4 SnackBar( 5 content: Text('You have removed an item'), 6 action: SnackBarAction( 7 label: 'Undo', 8 onPressed: () { 9 // Some code to undo the change 10 }, 11 ), 12 ), 13 ); 14 } 15
This, however, is just scratching the surface of Snackbar customization. There's so much more you can do with shapes, layouts, and Snackbar behavior to make them truly your own.
Understanding the Scaffold widget is instrumental to implementing Snackbar effectively in Flutter. A Scaffold is essentially a visual scaffold. It provides a framework that carries material design widgets, implementing the basic material design visual layout structure for you.
One key feature of Scaffold is its ScaffoldMessenger attribute. As you may have noticed by now, it allows us to call showSnackbar, which enables us to display a Snackbar within the Scaffold.
1 // Basic Scaffold structure with a Snackbar. 2 Scaffold( 3 body: Center( 4 child: ElevatedButton( 5 onPressed: () { 6 ScaffoldMessenger.of(context).showSnackBar( 7 SnackBar( 8 content: Text('Hello Snackbar within Scaffold!'), 9 ), 10 ); 11 }, 12 child: Text('Show Snackbar'), 13 ), 14 ), 15 ); 16
Always remember to have a Scaffold as an ancestor to the Snackbar, otherwise, the showSnackbar function will be null and you might run into context-based errors.
Snackbar holds a strategic spot in designing user-friendly applications. Properly utilized Snackbar feedback not only makes your app responsive but also offers an enhanced user experience.
A well-timed Flutter Snackbar can provide feedback or reports about an operation, such as an item being saved in the cart, a comment posted, or a service unavailability. Furthermore, with the addition of actions, Snackbar becomes an interactive tool, allowing users to perform lightweight tasks like Undo, Retry, or maybe even navigation.
1 // Snackbar with an Undo action 2 ScaffoldMessenger.of(context).showSnackBar( 3 SnackBar( 4 content: Text('Item added to cart'), 5 action: SnackBarAction( 6 label: 'Undo', 7 onPressed: () { 8 // Code to undo the addition to cart 9 }, 10 ), 11 ), 12 ); 13
Despite its simplicity, Snackbar's strategic placement and transient nature mean it's always within reach when required, yet never in the way of the user’s experience. With that said, it's important to remember that overuse or improper use of Snackbar can easily annoy users or drown important information.
Through this exploration, we've managed to dive into the world of Snackbar, one of the simplest yet powerful widgets in Flutter. From the basic understanding of what Snackbar is, up to the journey of creating and personalizing our very own Snackbar feedback systems, we've covered a significant ground.
We started off by creating a simple function to show Snackbars, learned the importance and the role of Scaffold in displaying Snackbars, and advanced to customizing Snackbars to suit different needs. We also realized that Snackbar is more than just conveying feedback; it encompasses a user action that opens a corridor of interactive possibilities.
Throughout this journey, our primary focus was on Snackbar's implications on user experience, which is ultimately a determinant of any application's success. By now, you should have all the knowledge you need to incorporate effective Snackbars in your Flutter apps.
This wasn't simply a lesson on Snackbar, but a testimony to Flutter's flexibility and potential in enhancing user experience with basic widgets.
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