Скачать или смотреть Resolving the ViewPager2 TabLayout Navigation Issue in Kotlin

Learn how to fix the issue where `ViewPager2` navigates to the last page when selecting tabs greater than 3 in your Kotlin Android application.
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This video is based on the question https://stackoverflow.com/q/77344925/ asked by the user 'Paras Rajora' ( https://stackoverflow.com/u/13424279/ ) and on the answer https://stackoverflow.com/a/77361559/ provided by the user 'Paras Rajora' ( https://stackoverflow.com/u/13424279/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the ViewPager2 TabLayout Navigation Issue in Kotlin

When building Android applications with ViewPager2 and TabLayout, developers often encounter various navigation issues. One particularly perplexing problem arises when a user selects a tab greater than 3, causing the ViewPager2 to erroneously jump to the last page. This issue can disrupt the overall user experience, but fortunately, there are effective solutions to this problem.

The Problem

You have implemented ViewPager2 along with TabLayout in your Kotlin application, encountering the following symptoms when selecting tabs:

Clicking on tabs 1, 2, and 3 works correctly.

Selecting tabs greater than 3 always navigates to the last page of the ViewPager2.

Swiping between pages works as expected, showing the correct fragments.

To troubleshoot, you analyzed logging outputs in your adapter and setup code, leading to the realization that structural issues in your setup might be causing the unexpected navigation behavior.

The Solution

The solution to this problem involves configuring TabLayoutMediator properly and adjusting how we handle scroll behavior in ViewPager2.

Step 1: Modify TabLayoutMediator Configuration

Initially, the TabLayoutMediator configuration may have the wrong parameters. Here's how to update it:

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In this setup:

The third argument (true) ensures that the TabLayout watches the ViewPager2’s page changes.

The fourth argument (false) indicates that the scroll behavior should not be animated.

Step 2: Disable Smooth Scrolling

One of the key aspects to focus on is the smooth scrolling functionality. By setting smooth scrolling to false, you can substantially mitigate the navigation issue when selecting tabs greater than 3.

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

Final Adapter Adjustments

Ensure your adapter is set up properly and not creating unnecessary complications:

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

Log Monitoring

Keep an eye on your log outputs as you implement these changes. This can provide crucial insights and ensure that fragments load correctly without triggering unintended side effects.

Conclusion

By adjusting your TabLayoutMediator and disabling the smooth scrolling effect, you can resolve the issue of the ViewPager2 accidentally navigating to the last page when interacting with tabs greater than 3. Following these steps will significantly improve the navigation experience in your Kotlin Android application, allowing users to seamlessly switch between different sections of your app without disruption.

Implement these solutions today and enhance the user interface of your application to deliver a smooth experience!