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Learn how to easily insert an item in between your list items using `ListView.separated()` in Flutter. This guide breaks down the solution step-by-step!
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This video is based on the question https://stackoverflow.com/q/69491954/ asked by the user 'Debasish Sarkar' ( https://stackoverflow.com/u/12766612/ ) and on the answer https://stackoverflow.com/a/69492059/ provided by the user 'Sanjay Soni' ( https://stackoverflow.com/u/16421206/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Insert an Item Between List Items Using ListView in Flutter

Flutter is a powerful UI toolkit by Google that allows developers to create beautiful applications for mobile, web, and desktop from a single codebase. One of the common tasks in mobile development is displaying lists of items. If you're working with ListView.builder(), you might have encountered a situation where you need to insert an item in between your list items. For instance, if you have a list of 10 items, how can you display an extra item after the third list item?

In this guide, we'll explore how to achieve this using the ListView.separated() method in Flutter. Below, we'll provide a straightforward solution and explain the steps in detail.

Understanding ListView.separated()

ListView.separated() is a convenient way to create a list view where you can insert separators between your list items. This method not only allows you to display a collection of items but also gives you the flexibility to add custom separators.

Why Use ListView.separated()?

Using ListView.separated() offers several advantages:

Cleaner Code: Eliminates the need for additional logic to manage separators separately.

Easier Maintenance: Changes are simpler, as the separation logic is part of the list view definition.

Customizable: You can define what the separator looks like or even insert additional complex widgets.

Step-by-Step Solution

Let’s break down how to insert an item into your list view after a certain number of items, using ListView.separated().

Step 1: Define Item Count

First, determine the total number of items you want to display in your list. For this example, we are setting itemCount to 10.

Step 2: Create the Item Builder

Use the itemBuilder property to create the widgets you want to display in your list. In this case, we’ll display ListTile widgets.

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Step 3: Define the Separator Logic

The key part of our solution is in the separatorBuilder. This is where you can define what will happen at a specific index. According to our requirement, we want to add a custom widget after the third item.

Here's how you can do it:

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Complete Sample Code

Putting it all together, here’s the complete code snippet for implementing ListView.separated():

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Customizing Your Separator

Feel free to replace the Container() with any Flutter widget you want to show. It can be an image, a text widget, or even a button – the possibilities are endless!

Conclusion

Inserting an item between list items using ListView in Flutter is straightforward when using the ListView.separated() constructor. By following the structured approach outlined in this post, you can flexibly add custom items between your list elements—enhancing the user experience of your applications.

With this knowledge in hand, you can further customize your list views according to your application’s needs. Happy coding!