Скачать или смотреть Solving the RecyclerView Searchview Disappearing Items Issue in Android

Discover how to fix the problem of all items disappearing in a `RecyclerView` when using `SearchView` in your Android app. This guide will walk you through the solution step-by-step.
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This video is based on the question https://stackoverflow.com/q/66250023/ asked by the user 'taha aaass' ( https://stackoverflow.com/u/15224445/ ) and on the answer https://stackoverflow.com/a/66268674/ provided by the user 'i_A_mok' ( https://stackoverflow.com/u/4898562/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the RecyclerView SearchView Disappearing Items Issue in Android

When developing Android applications, especially ones that utilize a RecyclerView along with a SearchView, it can be frustrating to encounter issues where items seemingly disappear when trying to search. This can lead to confusion and wasted time as you troubleshoot what went wrong. Today, we’ll address this specific issue by walking you through an effective solution.

Understanding the Problem

In this scenario, an application retrieves a list of workers from a Firebase database and presents them in a RecyclerView. However, when a user attempts to search using the SearchView, all items from the list disappear, preventing the user from viewing any results. This is a common issue that can arise due to improper handling of the list filtering, and it often takes some digging to pinpoint the cause.

The Cause of Items Disappearing

The fundamental issue lies in how the filtering operation is implemented within the WorkerAdapter class. Specifically, if the filtering is not set up correctly, the list is cleared entirely without considering the original data. Let’s explore how to resolve this issue step-by-step.

Step-by-Step Solution

To fix the issue of items disappearing when using SearchView, we’ll implement a simple adjustment to the performFiltering method of the WorkerAdapter class. Here’s how:

1. Identify the Right Method to Modify

Within the WorkerAdapter class, locate the performFiltering method. This is where the filtering of items based on user input occurs.

2. Update the Code

Add a line of code at the very beginning of the performFiltering method. This line will ensure that the listFilter is populated with the original data from the list if it is empty. Here is the code to add:

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

3. Full Example of the Adjusted performFiltering Method

Here's what the modified performFiltering method will look like after the adjustment:

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

4. Test the Solution

After making the code adjustment, it’s important to test the app. Try using the SearchView to filter the list of workers. You should see that instead of disappearing, the list now properly filters down to only show the items that match your search criteria.

Conclusion

By following these steps, you should now have a working SearchView in your RecyclerView without any items disappearing. Remember, always verify that your list-handling logic correctly preserves the original data when implementing filtering functionalities. This small but significant change can greatly improve the user experience of your Android applications. Happy coding!