How to Stop CircularProgressIndicator on Error in Flutter Login Page

Learn how to effectively manage the `CircularProgressIndicator` in your Flutter app during login authentication, especially when errors occur.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Stop CircularProgressIndicator when error occurs

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Stop CircularProgressIndicator on Error in Flutter Login Page

When developing a login page in Flutter that integrates with Firebase, it's common to display a loading indicator to inform users that their request is being processed. However, an issue arises when an error occurs (like user not found or wrong password): the loading indicator continues to spin, confusing the users. In this guide, we will explain how to properly handle errors during login and stop the CircularProgressIndicator when they occur.

The Problem

You've implemented user authentication using Firebase in your Flutter app and shown a CircularProgressIndicator when the user clicks the login button. Everything works wonderfully if the credentials are correct, but if there’s an error, the indicator keeps spinning. This can lead to a frustrating user experience, as they won't know what went wrong.

In your code, you are using a modal dialog to show the CircularProgressIndicator, but it doesn't dismiss on authentication failure, leaving users in the dark. Let's dive into the solution to this problem.

Solution Overview

To resolve this issue, you'll want to set a loading state variable while the login process is underway and toggle that variable based on the outcome of the authentication attempt. Here’s how you can effectively implement this:

Step-by-Step Implementation

Declare a Loading Variable: Add a boolean variable to track the loading state. This will help you control when to show or hide the CircularProgressIndicator.

Modify Your Login Function: Update your login function to set the loading state before and after the authentication process.

Show and Dismiss the Loading Indicator: Use Flutter's showDialog and handle error scenarios by dismissing the dialog when an exception occurs.

Here is a breakdown of how your code can look:

Updated Code

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

Key Points Explained

Boolean Variable: We introduced isLoading that helps to control whether the loading indicator should appear or not.

Dialog Management: By calling pop() on the navigator key when an error is caught, we ensure that the loading indicator is dismissed.

User Feedback: Using a SnackBar to show error messages provides immediate feedback to users, helping them understand what went wrong.

Conclusion

Having a CircularProgressIndicator that won't stop can be frustrating for users, but with a few simple changes, you can create a smoother experience. By managing the loading state and providing feedback through error messages, you'll ensure that users are always aware of what is happening during their login attempt. Implement these changes in your Flutter application, and enjoy a more polished and user-friendly login process.

Feel free to reach out if you have questions or need further assistance. Happy coding!