Скачать или смотреть How to Change a Specific Card Color in Flutter's ListView.builder on Tap

Learn how to change the color of a specific card in Flutter's `ListView.builder` when tapped. This guide walks you through the implementation process step-by-step.
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This video is based on the question https://stackoverflow.com/q/64476552/ asked by the user 'Mir Fahim Rahman' ( https://stackoverflow.com/u/14466669/ ) and on the answer https://stackoverflow.com/a/64476738/ provided by the user 'Raine Dale Holgado' ( https://stackoverflow.com/u/12789200/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In the world of Flutter development, creating interactive user interfaces is key to providing a great user experience. One common requirement is to change the color of a card when it is tapped, particularly within a ListView.builder. This feature can enhance the visual responsiveness of your app and provide feedback to users.

If you've been struggling with the scenario where tapping one card changes the color of all cards instead of just the one intended, there's a straightforward solution to your dilemma. In this guide, we will explore how to implement this feature effectively.

Problem Overview

You want to create a list of cards using Flutter's ListView.builder, where each card has a color that changes when tapped. However, your current implementation causes every card’s color to change instead of just the tapped card.

Why Does This Happen?

The issue arises because of how the state is managed in your widget. When a boolean variable, like isPressed, is shared across all cards, it results in uniformity in color change across the entire list. What you need is a way to maintain the state for each individual card.

Solution to Change a Specific Card Color

To achieve the desired functionality, we’ll implement an approach that involves creating a stateful widget for each card. This allows each card to maintain its own state. Below are the steps and the code to implement this solution.

Step 1: Set Up the Stateful Widget

To allow each card to maintain its tapped state, we will create a new MyCard class that will be a StatefulWidget.

Step 2: Create the Card Widget Structure

Here’s how you can create your custom card widget and integrate it within a ListView.builder:

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

Explanation of the Code

Stateful Widget: MyCard is a stateful widget which allows it to maintain its own color state.

Boolean State: Each card has its own _isPressed variable that toggles its color when tapped.

InkWell: The InkWell widget handles the tap event to change the color of the card.

Step 3: Integrate into ListView.builder

You simply call the MyCard widget multiple times in the ListView.builder, and each instance will behave independently regarding its color state.

Conclusion

This implementation allows for a simple yet effective way to manage the tapped state of individual cards within a ListView.builder. Users can now enjoy visual feedback by tapping on each card, enhancing their interactive experience.

No longer will tapping a card affect all cards; only the selected card will respond to the touch!

Feel free to adapt the code for your specific needs—adding more functionality or design elements as required. Happy coding!