Скачать или смотреть How to Display a Snackbar for Successful and Failed API Requests in Flutter

Learn how to effectively use `snackbars` in Flutter to indicate success and failure when posting data to an API. Improve your app's user experience with proper validation and error handling!
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This video is based on the question https://stackoverflow.com/q/72042646/ asked by the user 'Boss Nass' ( https://stackoverflow.com/u/1448378/ ) and on the answer https://stackoverflow.com/a/72047766/ provided by the user 'Ashutosh Agarwal' ( https://stackoverflow.com/u/10201516/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display a Snackbar for Successful and Failed API Requests in Flutter

When building applications in Flutter, delivering feedback to users is essential, particularly when performing HTTP requests. One effective way to do this is through the use of snackbars. If you've encountered an issue where a snackbar indicates success even when data posting should fail, you're not alone! In this post, we'll break down how to properly implement snackbars for both success and error states in your app.

Understanding the Problem

You may notice that when using snackbars, they show success messages even when the API call fails. This may happen because the code to show the snackbar is executed without validating the response from the HTTP request. Instead, we need to check the response's status to determine whether the operation was successful or if it encountered an error.

Solution Breakdown

To properly handle the API response and show the appropriate message, we can follow these steps:

Step 1: Structure the API Call

Here's our function for creating a payment which includes posting data to an API and handling the response:

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

Step 2: Catch Errors

Next, implement error handling using a try-catch block to capture any exceptions that might occur during the API call:

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

Step 3: Putting It All Together

When using the above structure, the application responds correctly based on the API's response status. If the payment is successfully processed, the user gets a snackbar indicating success. If there is an error, an informative error message will be displayed instead.

Key Points to Remember

Verify Response Status: Always check the HTTP response status code to confirm the success or failure of the request.

Use Try-Catch for Error Handling: Implementing error handling will ensure that users are aware when something goes wrong.

Feedback Mechanism: Snackbars serve as a great way to communicate information back to the users quickly and effectively.

By following this guide, you'll be able to improve your Flutter app by providing appropriate feedback through snackbars, making the user experience smoother and more informative. Happy coding!