Скачать или смотреть Solving the OnSeekBarChangeListener Mystery in Custom Seekbars for Android

Discover why the `onProgressChanged` method is not triggered in your custom Seekbar class and learn how to fix it with this engaging guide on Android Seekbar implementation.
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This video is based on the question https://stackoverflow.com/q/65797279/ asked by the user 'DIRTY DAVE' ( https://stackoverflow.com/u/11110509/ ) and on the answer https://stackoverflow.com/a/65802529/ provided by the user 'DIRTY DAVE' ( https://stackoverflow.com/u/11110509/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Custom Seekbar Implementation in Android

Creating custom UI components in Android can be a fun challenge, especially when you want to provide an engaging user experience. One common UI component that developers often customize is the SeekBar. However, implementing functionalities like the OnSeekBarChangeListener can sometimes lead to perplexing issues. In this guide, we'll dive into a specific challenge: why the onProgressChanged method is not being called in a custom SeekBar class and how to resolve this issue.

The Problem

You have a custom Seekbar class called SeekbarSphereNodeRotator where you've implemented the OnSeekBarChangeListener. Despite your methods being defined, the *onProgressChanged method never gets called when the SeekBar thumb is moved.

Here's the constructor code where you initialize your custom Seekbar:

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

You've even tried setting the listener inside the constructor with:

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

Yet, it still doesn't work as expected. So, what could be going wrong?

Solution: Setting the Listener Properly

The solution to your problem involves ensuring that the listener is set correctly in all constructors. To make sure that the onProgressChanged method is invoked when the SeekBar's thumb is moved, you need to call setOnSeekBarChangeListener(this) in the constructor that accepts AttributeSet parameters. This will initialize your listener and allow the methods to respond appropriately. Here’s how to implement it:

Updated Constructor

You need to add the listener setting to your existing constructor like this:

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

Complete Class Example

Here's how your complete custom Seekbar class should look with the correct implementation of the listener:

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

Conclusion

By ensuring that the listener is set correctly in every constructor of your custom Seekbar class, you can effectively track the user's interactions with the SeekBar. The onProgressChanged method will now be called as expected, providing you with real-time updates when the thumb is moved. This simple fix can greatly enhance the interactivity of your Android applications.

Feel free to experiment with this and see how you can further customize your Seekbar to fit your app's needs. Happy coding!