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Скачать или смотреть Fixing Flutter Login Status Updates with Async Functions

  • vlogize
  • 2025-05-26
  • 1
Fixing Flutter Login Status Updates with Async Functions
Flutter Multiple setState in Async Functionflutterdart
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Описание к видео Fixing Flutter Login Status Updates with Async Functions

Learn how to manage `Flutter` state updates in asynchronous operations effectively during user login.
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This video is based on the question https://stackoverflow.com/q/70386051/ asked by the user 'Xenoranger' ( https://stackoverflow.com/u/2242013/ ) and on the answer https://stackoverflow.com/a/70395444/ provided by the user 'Xenoranger' ( https://stackoverflow.com/u/2242013/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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: Flutter Multiple setState in Async Function

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Fixing Flutter Login Status Updates with Async Functions

Creating a seamless user experience during login can be challenging, especially in Flutter applications where state management plays a crucial role. Many developers encounter issues when trying to show real-time updates during an asynchronous operation, like logging in. In this guide, we will walk through a common problem faced by Flutter developers regarding multiple setState calls in async functions, and how to effectively resolve it.

The Problem

Imagine you are developing a login page for your application. Initially, when a user attempts to log in, you want to display a message saying, "Logging In." However, instead of the expected behavior, the app appears to freeze during the waiting period. The status updates, like showing the message "Retry Login," only occur after the user interacts with an AlertDialog, causing confusion.

Here’s a simplified version of the button press handler you might have in your app:

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

The issue lies within the TimeOutCheck() function, where a synchronous sleep is used, blocking other operations and causing the status message not to appear as expected.

Understanding the Issue

The main flaw is the use of the sleep function within the TimeOutCheck() method. This function does not allow the Flutter event loop to process other tasks, like updating the UI.

Here's the problematic code snippet:

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

Why sleep is Not Ideal

Blocking Call: It blocks the thread preventing the UI from updating until it’s finished.

Poor User Experience: Users won’t see any feedback until the sleep duration ends.

The Solution

To fix this, we can replace sleep with Future.delayed(). This function allows for a delay while still keeping the UI responsive and making it capable of processing updates.

Updated TimeOutCheck() Function

Here's how to correctly implement the TimeOutCheck() function using Future.delayed():

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

Changes Made

Async Handling: By using await Future.delayed(), we allow Flutter to process other asynchronous tasks and update the UI.

Status Updates: The UI will now correctly display "Logging In" as soon as the button is pressed, followed by updating the status if a timeout occurs.

Conclusion

Managing state in Flutter, especially when dealing with asynchronous operations, can be tricky. By avoiding synchronous blocking calls, like sleep, and using Future.delayed(), we improve the user experience significantly. Not only does this allow for timely feedback during login attempts, but it ensures your application remains responsive.

If you're developing a login functionality or any async task in Flutter, remember this approach to manage status updates effectively and enhance your app's user experience!

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