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Struggling with fragments not updating in your Android application? Discover the straightforward solution to fix this issue in your Kotlin code.
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This video is based on the question https://stackoverflow.com/q/64998884/ asked by the user 'mark' ( https://stackoverflow.com/u/14410812/ ) and on the answer https://stackoverflow.com/a/64999079/ provided by the user 'Ben P.' ( https://stackoverflow.com/u/8298909/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix Fragment Not Changing in Your Android App: A Kotlin Guide

If you're developing an Android application, using fragments is essential for creating a smooth user interface. However, it's common to encounter issues such as a fragment not updating as expected. In this guide, we'll take a closer look at the problem of a fragment not changing when a Floating Action Button (FAB) is clicked in a Kotlin-based Android app, and how to resolve it effectively.

Understanding the Issue

Imagine you've set up your app so that when a user clicks a Floating Action Button (FAB), a new fragment should appear with a smooth transition. You're logging print statements to ensure your code is running, but the fragment remains unchanged on the screen. This frustrating scenario is likely caused by one simple omission in your fragment transaction code.

The Solution

The Missing commit() Call

To successfully replace a fragment in your Android app using Kotlin, it is crucial to call the commit() method on the FragmentTransaction. Without this call, your changes—though they may be prepared—are never applied and the current fragment remains visible. Here’s a step-by-step breakdown of how to fix the issue.

Identify Where You Replace the Fragment:
In your replaceFragment function, you're currently performing these actions:

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

Add the commit() Call
To ensure your fragment changes are applied, add the commit() method after addToBackStack(fragment.javaClass.simpleName):

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

Update Your Function

Here’s how your complete replaceFragment function should look after incorporating the fix:

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

Implementing the Function Call

You’ve rightly called this function in your onViewCreated method:

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

With the above adjustments, your fragment should now update correctly when the Floating Action Button is clicked!

Conclusion

By simply ensuring you call commit() on your FragmentTransaction, you can avoid the frustrating issue of fragments not changing in your Android application. This easy fix can dramatically enhance the user experience in your app by ensuring transitions are smooth and immediate.

If you encounter further issues, remember to keep logging statements in your code to help with debugging. Happy coding!