Скачать или смотреть How to Display JSON Data in ListView Using Model Class in Flutter

Learn how to fetch and display a list of JSON data in a ListView using a model class in Flutter. This guide covers parsing, creating model classes, and building a user interface.
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This video is based on the question https://stackoverflow.com/q/68860950/ asked by the user 'Dhaval Chaudhari' ( https://stackoverflow.com/u/16686893/ ) and on the answer https://stackoverflow.com/a/68860996/ provided by the user 'stacktrace2234' ( https://stackoverflow.com/u/15302273/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display JSON Data in ListView Using Model Class in Flutter

Introduction

Navigating through JSON data can be tricky, especially when you want to display it in a user-friendly way. If you’re working with Flutter and trying to display a list of subjects from a JSON response in a ListView, you might be encountering challenges. This guide will guide you step-by-step in building a ListView to effectively showcase data like subject names and images from a JSON object.

Understanding the JSON Structure

Here’s the sample JSON response we’ll be working with:

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

The JSON structure contains a success indicator and a list of subjects, each with its own attributes like subject_id, subject_name, image, and more.

Creating the Model Class

To make working with this data easier, the first step is to create a model class. This class will map the JSON data structures to Dart constructs. We can use the example provided to construct our model class.

Here’s the Dart code to parse the JSON:

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

Key Features of the Model Class:

Data Conversion: The fromJson and toJson methods allow for easy conversion between JSON and Dart objects.

Ease of Access: You can easily access each subject's details through the model class.

Building the ListView

Now that we have our model in place, we can build a ListView to display the subjects. We will populate the ListView with the data from our list of subjects, ensuring the subject name appears next to its corresponding image.

Here’s how you can achieve this:

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

Explanation:

ListView.builder: This creates a scrollable list where each item is built on demand, improving performance for long lists.

ListTile: Each item is represented as a ListTile that supports a leading image and title, creating a neat layout.

Conclusion

Displaying JSON data in a ListView with Flutter becomes easy with the right model classes and techniques. By following the steps outlined above, you can effectively parse your JSON data, construct a model, and present it in a visually appealing manner. Whether you're developing complex applications or simple displays, mastering this technique is an essential skill in your Flutter journey.



By understanding how to manage data and build interfaces in Flutter, you open doors to creating robust applications that can leverage dynamic data sources efficiently. Happy coding!