OpenVK: Crash При Открытии Видео В Новостях - Как Исправить?

by Kenji Nakamura 61 views

Hey guys! We've got a critical issue here with the OpenVK Legacy app. It seems like users are experiencing crashes when trying to watch videos in the News feed. Let's dive into the details and figure out what's going on.

Discussion Category

This issue falls under the OpenVK category, specifically within the mobile-android-legacy section. This means we're dealing with a problem in the older Android version of the app, which requires careful attention to ensure a smooth user experience.

Additional Information: Crash Logs

Here are the crucial crash logs that we need to analyze. These logs provide a detailed snapshot of what's happening under the hood when the app crashes. Let's break down the key parts:

OpenVK Legacy 1.2.243-d (73af0e2)
==============================================
DEVICE
Device: TECNO TECNO LH7n (codename: TECNO-LH7n)
Android: 14 (API 34)
==============================================
APP SETTINGS
Instance: N/A
HTTPS: Yes
Tablet UI?: No
==============================================
08-05 14:17:06.471 24537 24537 E AndroidRuntime: FATAL EXCEPTION: main
08-05 14:17:06.471 24537 24537 E AndroidRuntime: Process: uk.openvk.android.legacy, PID: 24537
08-05 14:17:06.471 24537 24537 E AndroidRuntime: java.lang.RuntimeException: Unable to destroy activity {uk.openvk.android.legacy/uk.openvk.android.legacy.core.activities.VideoPlayerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5839)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5871)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:47)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:180)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:98)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2561)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:106)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.os.Looper.loopOnce(Looper.java:243)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:338)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:8470)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1064)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at uk.openvk.android.legacy.core.activities.VideoPlayerActivity.onDestroy(VideoPlayerActivity.java:330)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.Activity.performDestroy(Activity.java:8934)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1495)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5826)
08-05 14:17:06.471 24537 24537 E AndroidRuntime: 	... 13 more
08-05 14:17:06.472 24537 24537 E ACRA    : ACRA caught a RuntimeException for uk.openvk.android.legacy
08-05 14:17:06.472 24537 24537 E ACRA    : java.lang.RuntimeException: Unable to destroy activity {uk.openvk.android.legacy/uk.openvk.android.legacy.core.activities.VideoPlayerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5839)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5871)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:47)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:180)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:98)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2561)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.os.Handler.dispatchMessage(Handler.java:106)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.os.Looper.loopOnce(Looper.java:243)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.os.Looper.loop(Looper.java:338)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.ActivityThread.main(ActivityThread.java:8470)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at java.lang.reflect.Method.invoke(Native Method)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1064)
08-05 14:17:06.472 24537 24537 E ACRA    : Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.472 24537 24537 E ACRA    : 	at uk.openvk.android.legacy.core.activities.VideoPlayerActivity.onDestroy(VideoPlayerActivity.java:330)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.Activity.performDestroy(Activity.java:8934)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1495)
08-05 14:17:06.472 24537 24537 E ACRA    : 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5826)
08-05 14:17:06.472 24537 24537 E ACRA    : 	... 13 more
08-05 14:17:06.575 24537 32468 E ACRA    : uk.openvk.android.legacy fatal error : Unable to destroy activity {uk.openvk.android.legacy/uk.openvk.android.legacy.core.activities.VideoPlayerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.575 24537 32468 E ACRA    : java.lang.RuntimeException: Unable to destroy activity {uk.openvk.android.legacy/uk.openvk.android.legacy.core.activities.VideoPlayerActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5839)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5871)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:47)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:180)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:98)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2561)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.os.Handler.dispatchMessage(Handler.java:106)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.os.Looper.loopOnce(Looper.java:243)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.os.Looper.loop(Looper.java:338)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.ActivityThread.main(ActivityThread.java:8470)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at java.lang.reflect.Method.invoke(Native Method)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:600)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1064)
08-05 14:17:06.575 24537 32468 E ACRA    : Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void uk.openvk.android.legacy.utils.media.OvkMediaPlayer.stop()' on a null object reference
08-05 14:17:06.575 24537 32468 E ACRA    : 	at uk.openvk.android.legacy.core.activities.VideoPlayerActivity.onDestroy(VideoPlayerActivity.java:330)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.Activity.performDestroy(Activity.java:8934)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1495)
08-05 14:17:06.575 24537 32468 E ACRA    : 	at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5826)
08-05 14:17:06.575 24537 32468 E ACRA    : 	... 13 more

The logs indicate a NullPointerException in the VideoPlayerActivity's onDestroy method. Specifically, the app is trying to call OvkMediaPlayer.stop() on a null object. This means that the OvkMediaPlayer instance is not being properly initialized or is being prematurely released, leading to the crash. This NullPointerException is a critical issue that needs to be addressed ASAP!

Key Observations from the Logs

  1. Device: The crash occurred on a TECNO TECNO LH7n device running Android 14 (API 34).
  2. App Version: The app version is OpenVK Legacy 1.2.243-d (73af0e2).
  3. Crash Location: The crash happens in VideoPlayerActivity.onDestroy at line 330.
  4. Root Cause: The OvkMediaPlayer object is null when stop() is called.

Diving Deeper into the NullPointerException

To really get to the bottom of this, we need to understand the lifecycle of the VideoPlayerActivity and how the OvkMediaPlayer is managed. Here’s a breakdown of what’s likely happening:

  • Activity Lifecycle: In Android, activities have a lifecycle (onCreate, onStart, onResume, onPause, onStop, onDestroy). The onDestroy method is called when the activity is being destroyed.
  • MediaPlayer Management: The OvkMediaPlayer should be initialized when the video player activity is created (likely in onCreate or onStart) and released or stopped when the activity is destroyed (in onDestroy).
  • The Problem: The log suggests that the OvkMediaPlayer object is sometimes null when onDestroy is called. This could happen if:
    • The OvkMediaPlayer is not being initialized correctly.
    • There's a logic error where the OvkMediaPlayer is being set to null under certain conditions but not others.
    • The activity is being destroyed in an unexpected state.

Potential Causes and Solutions

To address this, we need to investigate several potential causes and implement corresponding solutions. Let's explore some of the most likely scenarios:

  1. Race Condition: A race condition could be occurring if the media player is being released on a separate thread, and onDestroy is called before the release is complete. This would lead to the media player being null when stop() is called.

    • Solution: Ensure proper synchronization when releasing the media player. Use mechanisms like locks or handlers to ensure that onDestroy is called after the media player is fully released.

  2. Incorrect Initialization: If the OvkMediaPlayer is not initialized correctly in the first place, it will obviously be null when onDestroy is called. This could happen if there’s a conditional initialization that’s not always being met.

    • Solution: Double-check the initialization logic in onCreate or onStart. Make sure that OvkMediaPlayer is always initialized before any video playback starts. Add null checks and logging to verify the initialization status.

  3. Memory Management Issues: Android might be killing the activity to free up memory, and the OvkMediaPlayer might not be properly handled in these cases. This is more likely on devices with limited resources.

    • Solution: Implement proper state saving and restoration. Use onSaveInstanceState to save the video player's state and onRestoreInstanceState to restore it. This can help the app recover gracefully if the activity is killed by the system.

  4. Asynchronous Operations: If asynchronous operations are involved in video playback (e.g., loading video data), there could be a scenario where the activity is destroyed before these operations complete, leaving the OvkMediaPlayer in an inconsistent state.

    • Solution: Manage asynchronous operations carefully. Use AsyncTask, ExecutorService, or Kotlin coroutines, and ensure that these operations are properly canceled or completed before onDestroy is called. Use lifecycle-aware components to automatically manage the lifecycle of these operations.

Steps to Reproduce and Debug

To effectively fix this bug, we need to reproduce it consistently. Here are steps we can take:

  1. Device and Android Version: Use a TECNO TECNO LH7n device running Android 14, if possible. If not, try to reproduce it on other devices running Android 14 or similar configurations.

  2. App Version: Ensure you’re using OpenVK Legacy 1.2.243-d (73af0e2) for testing.

  3. Steps:

    • Open the OpenVK Legacy app.
    • Navigate to the News feed.
    • Attempt to play a video.
    • Switch between apps or navigate away from the video player.
    • Observe if the app crashes.

  4. Debugging:

    • Use Android Studio to connect to the device and monitor logs.
    • Set breakpoints in VideoPlayerActivity.onDestroy and the OvkMediaPlayer release code.
    • Inspect the state of OvkMediaPlayer to see if it's null.

Code Snippets for Potential Fixes

Here are a few code snippets that illustrate potential fixes for the issues we’ve discussed:

1. Null Check Before Stopping MediaPlayer

@Override
protected void onDestroy() {
    super.onDestroy();
    if (ovkMediaPlayer != null) {
        ovkMediaPlayer.stop();
        ovkMediaPlayer.release();
        ovkMediaPlayer = null;
    }
}

2. Synchronized Release

private final Object mediaPlayerLock = new Object();

private void releaseMediaPlayer() {
    synchronized (mediaPlayerLock) {
        if (ovkMediaPlayer != null) {
            ovkMediaPlayer.stop();
            ovkMediaPlayer.release();
            ovkMediaPlayer = null;
        }
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    releaseMediaPlayer();
}

3. State Saving and Restoration

private static final String VIDEO_POSITION = "VIDEO_POSITION";
private int videoPosition;

@Override
protected void onPause() {
    super.onPause();
    if (ovkMediaPlayer != null && ovkMediaPlayer.isPlaying()) {
        videoPosition = ovkMediaPlayer.getCurrentPosition();
    }
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt(VIDEO_POSITION, videoPosition);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    if (savedInstanceState != null) {
        videoPosition = savedInstanceState.getInt(VIDEO_POSITION);
    }
}

@Override
protected void onResume() {
    super.onResume();
    if (ovkMediaPlayer != null) {
        ovkMediaPlayer.seekTo(videoPosition);
    }
}

Conclusion: Let's Squash This Bug!

Alright, guys, this crash is definitely a pain point for our users, and we need to tackle it head-on. By thoroughly analyzing the logs, understanding the activity lifecycle, and considering potential causes, we’re well-equipped to find a solution. Let’s get those debugging tools out, reproduce the issue, and implement the necessary fixes. High-quality content is key, and that includes making sure our video playback is smooth and crash-free. Let's do this!