Скачать или смотреть How to Show a Confirm Popup Before Closing Your Flutter App

Learn how to implement a confirm dialog in Flutter that prompts users before they close your app. Perfect for ensuring that users don't accidentally exit your application.
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This video is based on the question https://stackoverflow.com/q/68387728/ asked by the user 'user572575' ( https://stackoverflow.com/u/572575/ ) and on the answer https://stackoverflow.com/a/68387852/ provided by the user 'Neo Luk' ( https://stackoverflow.com/u/9635486/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introducing the Problem: Confirming Exit in Flutter Apps

When building Flutter applications, it's common to implement a close button in the AppBar. However, a challenge arises when users press this button and your app closes without any confirmation. Imagine if a user accidentally clicks the close button, losing unsaved data or their current state in the app. To prevent such scenarios, it's crucial to prompt users with a confirmation dialog before exiting the app. In this post, we will walk through how to display a confirmation popup before your Flutter application closes.

Understanding the Current Code

Initially, you may have set up a close icon in your AppBar, but when pressed, it does not show a confirmation dialog. Instead, it directly attempts to close the app. Here's the core part of your initial code setup, emphasizing the usage of WillPopScope and how it falls short:

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

In the above setup, the onPressed of the close button does not implement a solution that actually invokes the confirmation dialog.

The Solution: Implementing WillPopScope and Show Exit Popup

To better manage the closing behavior of your app, we need to correctly utilize WillPopScope in conjunction with a custom exit confirmation popup.

Step-by-step Implementation

Wrap Scaffold with WillPopScope: Ensure that your entire Scaffold is within the WillPopScope. This way, it can manage both hardware back actions and your custom button actions.

Create a showExitPopup Function: This function will display an alert dialog asking users whether they really want to exit.

Call the Popup in the Close Button: Inside your close button’s onPressed method, trigger the popup function.

Updated Code Example

Here’s how your updated code should look after implementing the above steps:

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

Key Points to Note:

Custom Exit Logic: The showExitPopup function will ask for user confirmation before closing the app.

Scaffold Structure: The WillPopScope needs to have the Scaffold as its child to intercept the back button event properly.

User Experience: This improvement helps create a smoother and safer user experience by preventing unwanted app closure.

Conclusion

By implementing the WillPopScope and ensuring proper callback handling in your close button, you ensure that users won't accidentally exit your app without the chance to confirm their action. This simple yet effective solution enhances the usability of your Flutter application while protecting users from accidental closures. Start implementing this in your app today and create a more user-friendly experience!