Implementing a Snackbar in Flutter for Global Connectivity Status Changes

Описание: Discover how to implement a `Snackbar` that notifies users about connectivity status changes across all screens in your Flutter app, using a simple wrapper widget approach.
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This video is based on the question https://stackoverflow.com/q/64622653/ asked by the user 'Ahmad Mohy' ( https://stackoverflow.com/u/12125132/ ) and on the answer https://stackoverflow.com/a/64623222/ provided by the user 'Ravi Singh Lodhi' ( https://stackoverflow.com/u/9511650/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing a Snackbar in Flutter for Global Connectivity Status Changes

In today's connected world, maintaining a reliable network connection is essential for mobile applications. As a Flutter developer, you might have encountered the need to show a notification whenever the connectivity status of your app changes. The question arises: Is it possible to implement a Snackbar one time in main.dart for all screen changes when the connectivity status changes? The answer is yes! In this guide, I'll guide you through a simple and elegant solution to achieve this using a wrapper widget.

Understanding the Problem

When a user's network status changes—be it switching from Wi-Fi to cellular, or losing connection altogether—it’s important that they are informed. You could check the connectivity status in each individual screen, but that would create unnecessary redundancy and complexity in your code. Instead, we can create a centralized solution that works for all screens.

The Solution: Using a Wrapper Widget

To manage connectivity status globally in a Flutter app, you can implement a ConnectivityWrapper. This widget will listen to connectivity changes and trigger a Snackbar notification whenever required. Here's how to set it up step-by-step:

Step 1: Create an Enum for Connectivity Status

First, we create an enumeration to represent different connectivity states.

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Step 2: Create a Connectivity Service

Next, you will need a service that listens for connectivity changes. Here’s how to set it up:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Implement the Connectivity Wrapper

Now, create a ConnectivityWrapper class to wrap your application's home widget:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Wrap Your Home Widget in main.dart

Finally, implement the ConnectivityWrapper in your main.dart to use it across all screens:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With the implementation outlined above, you can listen to connectivity changes globally within your Flutter app without the need for repetitive code in every single screen. You can easily adjust the logic within the wrapper to show a Snackbar, a toast message, or any other UI component to inform the user. This approach not only enhances user experience but also keeps your code clean and maintainable.

Implementing a global connectivity status notification will ensure that your users remain informed about their app’s accessibility in real time. Happy coding!