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Learn how to implement dynamic `spanCount` in RecyclerView, using GridLayoutManager to switch between different display configurations for optimal usability.
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This video is based on the question https://stackoverflow.com/q/64964723/ asked by the user 'BrajendraSingh' ( https://stackoverflow.com/u/14600993/ ) and on the answer https://stackoverflow.com/a/64965153/ provided by the user 'George Samuel' ( https://stackoverflow.com/u/10277217/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Manage Dynamic spanCount in RecyclerView using GridLayoutManager

If you're working with Android development and using a RecyclerView with a GridLayoutManager, you might find the need to adjust how many items are displayed in a row, depending on the specific conditions of your dataset. A common requirement is to show a different number of spans after a fixed interval, like displaying spanCount 1 after every 10 items. This guide will guide you through achieving this functionality step-by-step.

Understanding the Problem

When using a GridLayoutManager set with a spanCount of 2, your items will be displayed two in a row. However, if you want to display only one item after every ten items, you need a way to dynamically alter the spanCount based on the item's position in the dataset.

Attempting to do this with the following code:

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

won't work as expected since it doesn't respond appropriately to item positions on scrolling or loading more items.

The Solution

To properly implement this functionality, we will utilize GridLayoutManager's SpanSizeLookup. This allows us to specify how many grid spans each item should occupy depending on its position. Here’s how you can achieve this with clear steps.

Step 1: Setting Up Your RecyclerView

You need to create a custom adapter to manage your dataset (shops and ads, in this case) effectively. We'll define the types of items (shops and ads) for our list, along with the way they will be displayed. Below is a Kotlin code example that we can convert to Java.

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Step 2: Managing Item Counts

In the getItemCount method, ensure it returns the total number of items, shops, and ads combined.

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

Step 3: Binding View Holders

In the onBindViewHolder method, you define when to load the advertisement items. Check the position to see if it’s an ad placement.

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

Step 4: Implementing Dynamic SpanSizeLookup

Here, we’ll allow the GridLayoutManager to decide how many spans each item should take:

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

Conclusion

By following these steps, you'll be able to dynamically manage the spanCount of your RecyclerView items using GridLayoutManager. This functionality is crucial for creating an interactive and user-friendly layout, especially when integrating advertisements or selectively displaying items based on counts.

If you have any questions or need further assistance, feel free to leave your comments below!