How to Call Snackbar on Function's Response in Flutter

Learn how to display conditional snack bars in Flutter based on API responses, improving user feedback in your app.
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This video is based on the question https://stackoverflow.com/q/73471421/ asked by the user 'swapnil mane' ( https://stackoverflow.com/u/18674968/ ) and on the answer https://stackoverflow.com/a/73471639/ provided by the user 'Jenis Navadiya' ( https://stackoverflow.com/u/16688806/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Call Snackbar on Function's Response in Flutter

When developing a Flutter app, providing feedback to users is crucial for a positive user experience. One common approach to achieve this is by using snack bars, which can display messages at the bottom of the screen. In this article, we'll explore how to implement a conditional snack bar that displays different messages based on the success or failure of an API response when adding a product to a cart in an e-commerce app.

Problem Statement

In our example, we have a scenario where a function is called to add a product to a shopping cart. After calling this function, we want to show a snack bar with a success message, stating "Product added to my cart!" if the product was added successfully. Conversely, if the request fails, we want to show a failure message instead. However, many developers struggle with the correct implementation of this logic, and errors can easily arise.

Initial Approach

Here's a snippet of how someone might try to implement this feature using Flutter's FutureBuilder:

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

Issues with this Approach

Using FutureBuilder in this context is unnecessary and can lead to confusion and errors. The FutureBuilder is intended to manage asynchronous operations and their states but is not required for a function call in a button press context. Instead, the logic can be greatly simplified.

Optimal Solution

We can improve the implementation by calling the API directly within the onPressed function and using the .then() method to handle the result. Here’s how:

Implementation of Snackbar

Here’s the revised code:

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

Breakdown of the Code

Calling the API: We call ApiServices.addToCart(productId). This function will return a future that resolves with either "done" or "failed".

Handling the Result: We use the .then((result) => {...}) method to execute code based on the API response:

If the response is "done", we show a success snack bar.

If it’s anything else (like "failed"), we show a failure snack bar.

SnackBar Display: Using ScaffoldMessenger.of(context).showSnackBar(...), we can easily display the snack bar with the appropriate message and an icon.

Conclusion

By simplifying your approach to handling API responses in Flutter, you can ensure your application is more efficient and user-friendly. Utilizing snack bars effectively enhances user interaction and provides real-time feedback on their actions, which is especially important in an e-commerce context.

don't let overcomplicated implementations confuse your user experience - keep it simple and straightforward!

With these adjustments, you should be able to effectively implement a conditional snack bar in your Flutter app. If you have any further questions or need additional clarification on this topic, feel free to ask!

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