Скачать или смотреть Solving the Issue of Android WebView Not Loading URLs from Button Listener

Discover how to fix the Android `WebView` not loading URLs when triggered from a button listener. Follow our step-by-step solution with code snippets!
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This video is based on the question https://stackoverflow.com/q/63438455/ asked by the user 'deanqx' ( https://stackoverflow.com/u/9590906/ ) and on the answer https://stackoverflow.com/a/63439920/ provided by the user 'deanqx' ( https://stackoverflow.com/u/9590906/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Issue of Android WebView Not Loading URLs from Button Listener

If you've been working with Android development and encountered an issue where your WebView doesn't load a URL when triggered from a button listener, you're not alone. This is a common problem faced by many developers, especially when working with asynchronous events and UI elements. In this guide, we will explore the cause of this problem and provide a clear, step-by-step solution to ensure your WebView functions correctly when linked to button interactions.

The Problem at a Glance

You may find that your WebView loads a site correctly in the onCreate method of your activity, yet fails to perform the same task when attempting to load a URL through a button's OnClickListener. Often, after lengthy periods of coding, small issues can arise that disrupt event handling in Android apps. In this case, the web view is correctly set up, but loading the URL via the button click does not deliver the expected results.

Here’s a snippet of code that illustrates the problem:

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Understanding the Solution

Why the Problem Occurs

This issue may stem from how Android handles UI threading. Directly attempting to load a URL from within a button listener can lead to the app not updating the UI properly. To remedy this situation, we need to utilize a separate thread to handle the URL loading operation. This makes the app more robust and ensures that the UI remains responsive.

Implementing a Thread for URL Loading

Here’s how to implement a threading solution that allows the WebView to load URLs correctly from the button listener:

Create a New Thread Class:
We'll create a new class that extends Thread, which will take care of the URL loading.

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Start the Thread in the Button Click Listener:
When the button is clicked, instantiate and start this thread to perform the URL loading operation.

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Final Implementation Example

Here’s how the entire onCreate method will look with the threading solution incorporated:

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Conclusion

Incorporating threading in your Android application allows you to efficiently manage UI updates, ensuring that your WebView operates as intended when loaded via button interactions. If you find yourself facing similar issues, a threading approach can often be the solution. By following the steps outlined above, you should be able to resolve the problem of the WebView not loading URLs from a button listener.

Make sure to test your implementation and observe how the WebView responds to various button events. Happy coding!