How to Use ExpansionTile in Flutter to Show Hidden ListTiles

Описание: Learn how to implement `ExpansionTile` in your Flutter app to create expandable ListTiles that reveal additional information when tapped.
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This video is based on the question https://stackoverflow.com/q/66949602/ asked by the user 'Kai Lehmensiek' ( https://stackoverflow.com/u/15555213/ ) and on the answer https://stackoverflow.com/a/66949838/ provided by the user 'Andrej' ( https://stackoverflow.com/u/13646430/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Transforming ListTiles in Flutter with ExpansionTile

If you're a Flutter developer, you might have encountered situations where you want to expand a list item and show additional details without overwhelming the user interface. This is particularly useful when displaying lists of information that could require further exploration. In this guide, we’ll address how to create an expandable ListTile that opens additional ListTiles beneath it when tapped and hides them when tapped again.

The Problem

You want to create a list of items using ListTiles in a Flutter application. When a user taps on a ListTile, it should expand to reveal two or more additional ListTiles. Conversely, tapping the same ListTile again should hide those additional items. This functionality enhances the usability of your app by keeping the interface clean while still allowing users to access more information as needed.

The Solution: The ExpansionTile Widget

To implement this functionality efficiently, you can use Flutter’s built-in ExpansionTile widget. This widget is similar to a regular ListTile but includes a children property, which allows you to specify the widgets (such as ListTiles) that will be shown or hidden when the tile is tapped.

Implementing ExpansionTile

Here’s a step-by-step guide to modifying your existing code to use ExpansionTile instead of standard ListTiles:

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Breakdown of the Code

Import the Material Package: The first line imports the necessary Flutter material package that contains the components needed for the UI.

Setup Statefull Widget: The Page5 class is a StatefulWidget allowing dynamic changes during interactions.

Implementing ExpansionTile: Each ListTile is replaced with an ExpansionTile, which takes a title and children properties.

Children Property: In the children property, you can define additional ListTiles that will be revealed when the ExpansionTile is tapped.

Benefits of Using ExpansionTile

User-Friendly: It presents a clean and manageable UI.

Dynamic Content: You can dynamically show or hide additional information as needed.

Minimal Code: The use of ExpansionTile reduces the complexity of managing multiple states.

Conclusion

The ExpansionTile widget provided by Flutter is a fantastic way to manage lists of items that have additional information hidden beneath the main title. This helps make your application more organized and enhances user experience. By following the simple steps outlined above, you can easily implement expandable ListTiles in your Flutter app.

Now that you have this informative approach to creating expandable ListTiles, why not try it out in your next Flutter project? Happy coding!