How to dynamically populate items into a ListView in Flutter using JSON from SharedPreferences

Описание: Discover how to replace static data in a Flutter ListView with dynamic JSON data using SharedPreferences, effortlessly creating a flexible interface for your applications.
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This video is based on the question https://stackoverflow.com/q/69811703/ asked by the user 'Tinovimba Mawoyo' ( https://stackoverflow.com/u/9374735/ ) and on the answer https://stackoverflow.com/a/69820072/ provided by the user 'Faiz Ahmad Dae' ( https://stackoverflow.com/u/5425860/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Dynamically Populate Items into a ListView in Flutter Using JSON from SharedPreferences

Creating a responsive and data-driven interface in Flutter can sometimes be a challenge, especially when it comes to replacing hard-coded lists with data from external sources like JSON. In this guide, we will tackle the problem of replacing static data in a ListView with dynamic content fetched from a JSON object stored in your application.

Understanding the Problem

You might have already created a Flutter application where you are utilizing a ListView to display a list of items hard-coded in your adapter class. However, there comes a time when you need to make your application dynamic. This is where JSON data comes into play, especially if you are storing your data in SharedPreferences or retrieving it from a remote server.

Let's take a look at the JSON object you might be working with:

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In this JSON, you have multiple holdings, each associated with different attributes. This is a perfect example of how to replace your adapter's dummy data with real data.

Solution: Replacing Dummy Data with JSON Data

Step 1: Define Your Model Class

You already started by defining the portfolioModel, which is excellent. However, you can enhance this class by adding a factory constructor that allows you to create an instance of this class from JSON.

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Step 2: Modify the Portfolio Adapter

Now, you’ll need to modify the PortfolioAdapter class to fetch data from the JSON object instead of returning static data.

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Step 3: Populate Your ListView in the Main Page

Finally, you will set up your ListView in the MyHomePage class to reflect the changes made to your adapter:

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Conclusion

By following the steps above, you can effectively replace hard-coded adapter data with dynamic JSON data in your Flutter application. Not only does this make your app more flexible and robust, but it also enhances the user experience by providing real-time data.

Now it's time to dig deeper and explore further optimizations and styling options to elevate your Flutter application!