Скачать или смотреть Fixing ProgressBar Visibility Issues in Fragments in Android

Learn how to manage `ProgressBar` visibility effectively during fragment transitions in your Android application.
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This video is based on the question https://stackoverflow.com/q/63559287/ asked by the user 'jyothi dadi' ( https://stackoverflow.com/u/14047098/ ) and on the answer https://stackoverflow.com/a/63559444/ provided by the user 'Roman Shtykalo' ( https://stackoverflow.com/u/11689400/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing ProgressBar Visibility During Fragment Transitions in Android

When developing Android applications, managing UI elements like a ProgressBar can sometimes become tricky, especially when using fragments. If you've encountered a scenario where the ProgressBar visibility does not change as expected when navigating from one activity to a fragment, you're not alone. In this guide, we will explore a common issue and provide a comprehensive solution to ensure that your ProgressBar behaves as desired during fragment transactions.

The Problem Overview

In your Android application, you might have a setup where clicking on items in a bottom navigation menu should toggle a ProgressBar's visibility. The intention is to display the ProgressBar when navigating to a fragment and make it invisible when the fragment is fully loaded. However, the code provided seems to have issues, particularly in managing the visibility of the ProgressBar when transitioning between the fragments.

Current Code Overview

In your MainActivity, you handle the fragment transitions like this:

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

The Solution: Using Fragment Lifecycle Callbacks

To manage the ProgressBar visibility effectively, we can utilize the FragmentLifecycleCallbacks provided by the FragmentManager. This allows us to perform actions at various stages of a fragment's lifecycle, including when a fragment is created.

Step-by-Step Implementation

Setup ProgressBar: Ensure your ProgressBar is initialized correctly in your MainActivity, which you've done successfully.

Register Lifecycle Callbacks: Modify the selectFragment method to register a fragment lifecycle callback right before committing the fragment transaction.

Here’s how the updated code will look:

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

Explanation of the Changes

Lifecycle Callbacks: By registering the FragmentLifecycleCallbacks, specifically the onFragmentCreated() method, we can hide the ProgressBar once the fragment has been created. This ensures that the ProgressBar is only visible when a new fragment is being loaded, providing a better user experience.

Visibility Management: The progressBar.setVisibility(View.GONE); line effectively hides the ProgressBar as soon as the fragment is created, resolving the issue of it not disappearing as intended.

Conclusion

Managing visibility for a ProgressBar during fragment transitions is crucial for providing a smooth user experience in your Android application. By employing the FragmentLifecycleCallbacks, you've not only resolved the visibility issue but also enhanced the overall reliability of your UI transitions. Should you have further questions or encounter other challenges, feel free to reach out or leave a comment below. Happy coding!