Скачать или смотреть How to Display List Values in a Text Class in Flutter

Discover how to effectively display a list of values in a Flutter app using the `Text` widget with this simple guide.
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This video is based on the question https://stackoverflow.com/q/65472168/ asked by the user 'JeeWoong Lee' ( https://stackoverflow.com/u/12659043/ ) and on the answer https://stackoverflow.com/a/65472213/ provided by the user 'dm_tr' ( https://stackoverflow.com/u/14231239/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Showcasing List Values in a Flutter Text Class

When working with Flutter, there are times when developers need to present data from a collection, such as a list of models or objects. In this guide, we will tackle a specific problem: how to show list values at a Text class in Flutter. The example we will work with involves a CourseModel that contains various attributes, and we are particularly interested in displaying the names from this model in a ListView.

Understanding the Problem

The original code setup was straightforward, with a CourseModel that has a dummy factory method returning a single instance containing course details. However, the challenge arose when attempting to display this information. The goal was to utilize Flutter's Text widget to show the course names, but an error indicated that there were “too many positional arguments.”

Here's a Simplified Version of the Original Code

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

The Error Explained

The error message “Too many positional arguments: 0 expected, but 1 found.” typically occurs when you try to pass a new instance of Text with the wrong parameters.

The Solution: Using ListView.builder

To resolve the error and successfully display the course names, we can make use of Flutter's ListView.builder. This widget is particularly useful when dealing with lists since it efficiently builds and recycles visible items.

Here’s the Corrected Code

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

Breaking Down the Code

ListView.builder: Replaces the standard ListView to efficiently build items only when they scroll into view.

itemCount: Specifies the number of items in the list, which in this case is the length of courseList.

itemBuilder: A function that takes context and index, returning a widget (in our case, a ListTile) for each item in the list.

ListTile: A convenient way to create a list item with a title, subtitle, and leading or trailing icons, which we’re using here to present the course names.

Implementation in Your Flutter App

Here’s how to implement this solution in your Flutter application:

Replace your existing ListView with the ListView.builder as illustrated above.

Ensure that courseList is populated correctly as desired. You can add more instances of CourseModel to see the full effect.

Conclusion

This simple guide demonstrates how to effectively display values from a list in a Flutter app using the Text widget within a ListView.builder. Utilizing this approach not only fixes the error you encountered but also allows for a more scalable solution for displaying data dynamically.

By following the implementation above, you’ll be able to show your course details seamlessly in your Flutter application!

If you have any questions or comments about this implementation or other Flutter topics, feel free to reach out or share your experiences below.