Suspiciously short list of threads when recording ANRError as Crashlytics non-fatal exception

Hi!

I integrated ANR-WatchDog to a Unity game using custom implementation of UnityPlayerActivity.

At first I released a game with the default behaviour of the ANR-WatchDog. My app crashed due to unhandled ANRError and Firebase Crashlytics recorded something around 40 threads at this moment including UnityMain thread and others. I used setReportMainThreadOnly() because Crashlytics collects all threads by itself on fatal errors.

Then I turned this crash to a non-fatal using this code:

    @Override protected void onCreate(Bundle savedInstanceState)
    {
        ANRWatchDog watchDog = new ANRWatchDog();
        watchDog.setANRListener(new ANRWatchDog.ANRListener() {
            @Override
            public void onAppNotResponding(ANRError error) {
                FirebaseCrashlytics crashlytics = FirebaseCrashlytics.getInstance();
                crashlytics.recordException(error);
            }
        });
        watchDog.start();

        super.onCreate(savedInstanceState);
    }

This code records ANRError as a non-fatal exception and Crashlytics attaches stack traces contained in ANRError. That is why you do not see setReportMainThreadOnly() here any more. But now crash reports a very short, containing only 8-10 threads. What is strange there were no UnityMain thread while this non-fatal was triggered in the middle of a gameplay.

Please help, any ideas on how to get full list of stack traces attached?

[AntonPetrov83]

Inside the Unity game loop I tried delaying stuff with System.Threading.Thread.Sleep(6000); but to no avail. Nothing gets triggered. Maybe blocking the Unity game loop does not cause ANRs?

Yeah, ANR triggers only when main thread is blocked and Unity runs on Unity-Main thread which is not main )) To emulate an ANR you can use code:

public class AndroidShowStopper : MonoBehaviour
{
    private static bool _stop;

    public static void Stop()
    {
        _stop = true;
    }
    
#if UNITY_ANDROID
    void Update()
    {
        if (_stop)
        {
            AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
            AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
            activity.Call("runOnUiThread", new AndroidJavaRunnable(runOnUiThread));
            
            _stop= false;
        }
    }

    void runOnUiThread()
    {
        Debug.Log("I'm running on the Java UI thread!");

        while (true);
    }
#endif
}

Just call AndroidShowStopper.Stop(); somewhere.

[WaheedRashad]

Hi!

I integrated ANR-WatchDog to a Unity game using custom implementation of UnityPlayerActivity.

At first I released a game with the default behaviour of the ANR-WatchDog. My app crashed due to unhandled ANRError and Firebase Crashlytics recorded something around 40 threads at this moment including UnityMain thread and others. I used setReportMainThreadOnly() because Crashlytics collects all threads by itself on fatal errors.

Then I turned this crash to a non-fatal using this code:

    @Override protected void onCreate(Bundle savedInstanceState)
    {
        ANRWatchDog watchDog = new ANRWatchDog();
        watchDog.setANRListener(new ANRWatchDog.ANRListener() {
            @Override
            public void onAppNotResponding(ANRError error) {
                FirebaseCrashlytics crashlytics = FirebaseCrashlytics.getInstance();
                crashlytics.recordException(error);
            }
        });
        watchDog.start();

        super.onCreate(savedInstanceState);
    }

This code records ANRError as a non-fatal exception and Crashlytics attaches stack traces contained in ANRError. That is why you do not see setReportMainThreadOnly() here any more. But now crash reports a very short, containing only 8-10 threads. What is strange there were no UnityMain thread while this non-fatal was triggered in the middle of a gameplay.

Please help, any ideas on how to get full list of stack traces attached?

How to integrate ANR-WatchDog to a Unity game using custom implementation of UnityPlayerActivity?