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Discover the reasons behind your Android game displaying Application Not Responding errors after leaving an activity and how to mitigate these issues in your code. --- Disclaimer/Disclosure: Some of the content was synthetically produced using various Generative AI (artificial intelligence) tools; so, there may be inaccuracies or misleading information present in the video. Please consider this before relying on the content to make any decisions or take any actions etc. If you still have any concerns, please feel free to write them in a comment. Thank you. --- Why Does My Android Game Show Application Not Responding After Leaving an Activity? If you're a developer working on an Android game, you might have encountered a frustrating issue: the dreaded Application Not Responding (ANR) dialog. This nuisance typically arises after leaving an activity, causing your game to become unresponsive. In this post, we'll discuss why your Android game shows ANR errors and how to mitigate this problem to ensure a smoother gaming experience. Understanding ANR An Application Not Responding error occurs when your app is not able to respond to user input for a certain period of time. On Android, the system displays an ANR dialog if an app is: Not responding to an input event (such as touch or keyboard input) within 5 seconds. A BroadcastReceiver hasn't finished executing within 10 seconds. For games, the situation often becomes critical as they involve heavy processing, real-time rendering, and frame rate management. All these factors could contribute to an ANR. Common Causes of ANR in Games Heavy Processing on the Main Thread: If your game performs extensive computational tasks on the main thread, it can block the UI rendering and input handling, leading to ANR. Long-running Operations in Activity Lifecycle Methods: Activities in Android have lifecycle methods like onCreate(), onPause(), and onDestroy(). Executing long-running tasks in these methods can delay the activity's response. Unreleased Resources: Not properly releasing resources such as threads, database connections, or file handles when leaving an activity can cause your game to freeze. Improper Thread Management: Inadequate synchronization between multiple threads (such as your game loop thread and the UI thread) can result in deadlocks or other performance issues. Mitigation Strategies To avoid ANR errors in your Android game, consider the following practices: Offload Tasks to Background Threads Use background threads for tasks that are resource-intensive, such as network operations, file I/O, or heavy computations. The AsyncTask, Thread, HandlerThread, or even architectures like RxJava can help with this. Efficient Activity Lifecycle Management Ensure that lifecycle methods are optimized and lightweight. Avoid performing tasks that can block the main thread. If you must perform a blocking operation, transition it to a background thread. Proper Resource Cleanup Release any resources that your activity uses before it is destroyed. Use onPause() or onStop() methods for this purpose. Consider using weak references for resources that might cause a memory leak. Use Performance Profilers Android Studio provides tools such as the Profiler to monitor CPU usage, memory consumption, and network calls. Use these tools to identify bottlenecks and optimize accordingly. Monitor and Optimize Synchronization Ensure that shared resources are accessed and modified safely across multiple threads. Avoid locking mechanisms that could lead to deadlocks. Implement mechanisms such as thread pools to better manage concurrency. Conclusion ANRs can detract from the user experience and even lead to your game being uninstalled. By understanding the common causes and implementing the best practices outlined above, you can significantly mitigate the risk of encountering ANR errors in your Android game. Keep your main thread responsive, manage resources efficiently, and profile your app to ensure it runs smoothly. If you have encountered Application Not Responding issues in your game, what strategies have worked for you? Share your insights in the comments below!