Скачать или смотреть Resolving the MaterialCardView Toggle Issue in RecyclerView with View Binding

Discover how to effectively toggle `MaterialCardView` items in a `RecyclerView` using View Binding in Kotlin. Clear steps to fix issues with last item toggling.
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This video is based on the question https://stackoverflow.com/q/67275882/ asked by the user 'dody.ac' ( https://stackoverflow.com/u/10836826/ ) and on the answer https://stackoverflow.com/a/67276849/ provided by the user 'Sukhvir' ( https://stackoverflow.com/u/15772308/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the MaterialCardView Toggle Issue in RecyclerView with View Binding

When working with Android development, one common issue developers encounter is related to toggling views within a RecyclerView. Specifically, many are experiencing problems when transitioning from Kotlin synthetic properties to View Binding. If you’ve recently migrated and found that toggling a MaterialCardView only affects the last item irrespective of which item you click, you're not alone. This guide will guide you through understanding and resolving this issue effectively.

The Problem

You might have noticed that after you switched to View Binding, interacting with the MaterialCardView within your RecyclerView seems broken. You click on any card, but only the last card's state is toggled. This frustrating quirk can be traced back to how child views are managed in the RecyclerView adapter.

Understanding onBindViewHolder

The onBindViewHolder method is crucial for binding your data in a RecyclerView. Here's the original code snippet that illustrates the issue you faced:

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

In this code, the binding is used directly, which does not take the specific holder into account. This means every click event is referring to the binding of the last view that was initially set up. Hence, the unexpected toggle behavior.

The Solution

To fix the toggling issue, you need to revert back to using the holder instance to access the views related to the currently binding item. Here’s how the corrected implementation looks:

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

Key Changes

Use holder.title and holder.categoryCard: By referring to the child views through the holder, we ensure that interactions correspond correctly to the clicked card.

Toggle Functionality: Each card's toggle state relates directly to its position in the list, ensuring that the clicked card performs as expected.

Conclusion

Migrating to View Binding can be a daunting process, but by understanding how to properly bind your views in a RecyclerView, you can resolve issues efficiently. The key takeaway is always to use the holder provided in onBindViewHolder for proper interactions with the specific views pertaining to each row. This practice will not only fix the immediate toggle problem but will also enhance the maintainability of your code moving forward.

With these adjustments, you should notice a smooth and functional toggling experience with your MaterialCardView inside the RecyclerView. Happy coding!