Скачать или смотреть How to Display Specific Items from an ArrayList in a RecyclerView

Discover how to effectively filter and display specific items, such as duplicates, from an ArrayList within a RecyclerView in your Android applications.
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This video is based on the question https://stackoverflow.com/q/67225925/ asked by the user 'Srilekha Reddy' ( https://stackoverflow.com/u/15745868/ ) and on the answer https://stackoverflow.com/a/67225996/ provided by the user 'Kamal Nayan' ( https://stackoverflow.com/u/14187529/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Displaying Specific Items from an ArrayList in a RecyclerView

If you’re working on an Android application and using a RecyclerView to display data from an ArrayList, you may run into a situation where you only want to display certain items based on specific criteria. This guide will guide you through how to display only the items that meet your criteria from an ArrayList in a RecyclerView. In this scenario, we will see how to filter items and only display those with the number 101.

Setting Up Your RecyclerView

Before diving into the filtering logic, let's quickly review how to set up your RecyclerView with an ArrayList. The initial code sample provided sets up the RecyclerView and an ArrayList containing items with their respective names and numbers. Here’s a brief overview of the setup:

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

In your onCreate method, you initialize the RecyclerView and populate the ArrayList like this:

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

Adding a Custom Adapter

Ensure you have a CustomAdapter class that accepts the arrayList and handles the binding of data to your RecyclerView items. The key part of this is in the onBindViewHolder method, where you need to implement your filtering logic.

Filtering Items in the Adapter

To ensure that only the items with the number 101 are displayed, you’ll adjust the onBindViewHolder method of your adapter class as follows:

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

Key points of the code:

Condition Check: The if statement checks if the item number is 101.

Setting Visibility: If the condition is true, it sets the text and keeps the item visible. If not, it hides the item (GONE), ensuring that it will not take up space in the RecyclerView.

Conclusion

By leveraging a simple condition in your adapter's onBindViewHolder, you can effectively filter out any unwanted items in your RecyclerView. This method will help maintain a clean user interface focused on the desired items, making it easier for users to navigate the data presented. Remember, adapting this pattern allows for greater flexibility, whether filtering by different attributes or implementing other conditions as needed in your app.

Happy coding! And don’t hesitate to reach out if you have any questions or need further assistance with your RecyclerView implementations.