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Discover how to create an `alert box` that appears when your progress indicator reaches 100% in Flutter, complete with examples and code!
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Show an Alert Box on Completion of Percentage Indicator in Flutter

When developing applications in Flutter, you might encounter a scenario where you need to provide feedback to users based on a percentage of completion. For instance, you might want to show an alert box when a progress indicator reaches 100%. This can significantly enhance user experience by confirming the completion of a task.

In this guide, we'll walk through how to achieve this in Flutter. We’ll outline the problem, then dive into the solution step by step.

The Problem

You want to display an alert box when a progress indicator, like a CircularPercentIndicator, fills up to complete status (100%). This is a common requirement in various applications, such as upload processes, downloads, or any task involving progress tracking.

The Solution

To show an alert box on the completion of a progress indicator in Flutter, we can utilize the Slider widget. Let’s break this down into manageable steps, along with example code.

Step 1: Setting Up Your Flutter Widget

First, create a stateful widget to manage the state of the progress. Here's a basic setup:

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

Step 2: Explanation of the Code

Stateful Widget: We started by creating a StatefulWidget called ASDA. This is essential because we need to keep track of the current value of the Slider.

Slider Widget: The Slider widget allows users to select a value. We initialize the value to 0 to represent the starting point of progress.

Listening to Slider Changes: In the onChanged callback of the Slider, we use setState to update the value. This re-renders the widget when the value changes.

Completion Check: We check if the Slider value reaches 1 (100% progress). If it does, we call the _showCompletionDialog() method.

Show Alert Dialog: Inside the _showCompletionDialog() method, we utilize showDialog to present an alert box with a title and content informing the user that the task is completed.

Conclusion

By following these steps, you can easily implement an alert box that notifies users when the progress indicator in your Flutter application reaches 100%. Such features not only enhance interactivity but also improve the overall user experience.

Feel free to modify the content of the alert dialog to fit your application's context. Happy coding!