Скачать или смотреть Fixing the Black Screen Issue When Dismissing a ProgressDialog in Android Threads

Learn how to solve the `black screen` issue when dismissing a ProgressDialog inside an Android thread. Discover the importance of UI Thread interaction and how to implement it effectively.
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This video is based on the question https://stackoverflow.com/q/71551986/ asked by the user 'PPavesi' ( https://stackoverflow.com/u/18033603/ ) and on the answer https://stackoverflow.com/a/71552104/ provided by the user 'Ahmed' ( https://stackoverflow.com/u/10202308/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the Black Screen Issue When Dismissing a ProgressDialog in Android

If you're an Android developer, you might have faced the frustrating issue of a black screen appearing when trying to dismiss a ProgressDialog inside a thread. This common problem can disrupt the user experience and lead to inconsistencies in your app's behavior. Let's dive into the cause of this issue and explore a solution that will set you on the right track.

Understanding the Problem

The core of the problem arises when performing UI operations on a background thread. In Android, user interface components should only be modified on the main UI thread. When you try to dismiss a ProgressDialog from a separate thread, the app can crash or freeze, resulting in a black screen.

Common Symptoms of the Issue

Black Screen: The app becomes unresponsive, presenting a black screen instead of the expected UI.

Crashes: The application may throw exceptions leading to crashes.

Dialog Not Dismissing: The progress dialog does not disappear as intended.

This makes it clear why it’s crucial to address how and where you manage the UI from within your threads.

Solution: Use runOnUiThread()

To fix this issue, you’ll need to ensure that any UI-related code, such as dismissing your ProgressDialog or changing visibility states, is executed on the main UI thread. Here’s how to implement this in your existing code.

Step-by-Step Implementation

Setting Up Your Thread: First, you create a new thread for performing your long-running operations.

Using runOnUiThread(): After your long-running tasks are completed, wrap your UI updates (like dismissing the dialog) in a runOnUiThread() method.

Here’s the revised code snippet that integrates these principles:

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

Key Code Components

Creating the ProgressDialog: This line of code initializes the ProgressDialog to indicate to users that a background process is ongoing.

Running in a New Thread: By moving long-running tasks to a separate thread, you avoid blocking the UI thread.

Wrapping UI Updates in runOnUiThread(): This is where the magic happens! By encapsulating your UI changes within runOnUiThread(), you ensure that they are executed on the main thread, preventing crashes and freezes.

Conclusion

By following these guidelines and utilizing runOnUiThread(), you can effectively resolve the black screen issue when dismissing a ProgressDialog. This approach not only ensures a seamless user experience but also reinforces best practices in Android development. Keep these principles in mind while coding, and you'll likely avoid many common pitfalls related to UI handling in threads.

Happy coding!