Google Analytics 中的并发修改异常

Question

I'm using Google Analytics for an Android app. The code usually works fine. However in production, the Google Analytics code fails occasionally with a ConcrruentModificationException. Crashlytics is reporting that.

Is that a bug in Google Analytics?

Must I create my own synchronization code to make sure that Google Analytics is only called from a single thread?

Fatal Exception: java.util.ConcurrentModificationException
   at java.util.HashMap$HashIterator.nextEntry(HashMap.java:851)
   at java.util.HashMap$EntryIterator.next(HashMap.java:891)
   at java.util.HashMap$EntryIterator.next(HashMap.java:890)
   at com.google.android.gms.analytics.Tracker.zzb(Unknown Source)
   at com.google.android.gms.analytics.Tracker.send(Unknown Source)

Answer 1

I got a solution, It's happening due to send event of Google Analytics. Multiple threads are using this method of tracker object.

We just need to make it synchronized as:

synchronized public Tracker getDefaultTracker() {
    // To enable debug logging use: adb shell setprop log.tag.GAv4 DEBUG
    if (sTracker == null) {
      sTracker = sAnalytics.newTracker(R.xml.global_tracker);
    }

    return sTracker;
  }

For more details check the links below: https://developers.google.com/analytics/devguides/collection/android/v4/

https://github.com/grazies/analytics-issues/issues/692