notification_open never reported if onCreate of MainActivity was not called

• Android Studio version: Android Studio Chipmunk | 2021.2.1
• Firebase Component: Firebase Cloud Messaging
• Component version: 23.0.5

Problems

My app has only one MainActivity, and it’s singleTask. When I received the notification and tap it to bring my app to foreground, the MainActivity was not recreated and its onCreate method was not called. So FcmLifecycleCallbacks had no chance to report the notification_open event.

Steps to reproduce:

1. Make the MainActivity singleTask, and don’t call finish, just send it to background
2. Enable Firebase Analytics debug, and open the DebugView
3. Push a notification to the device
4. Make sure we can see the notification_receive event in the DebugView
5. Tap the notification to open the App
6. notification_open event won’t show in the DebugView

Relevant Code:

FcmLifecycleCallbacks code below will never be called

  @Override
  public void onActivityCreated(Activity createdActivity, Bundle instanceState) {
    Intent startingIntent = createdActivity.getIntent();
    if (startingIntent == null || !seenIntents.add(startingIntent)) {
      // already seen (and logged) this, no need to go any further.
      return;
    }

    if (VERSION.SDK_INT <= VERSION_CODES.N_MR1) {
      // On Android 7.1 and lower Bundle unparceling is not thread safe. Wait to log notification
      // open after Activity.onCreate() has completed to try to avoid race conditions with other
      // code that may be trying to access the Intent extras Bundle in onCreate() on a different
      // thread.
      new Handler(Looper.getMainLooper()).post(() -> logNotificationOpen(startingIntent));
    } else {
      logNotificationOpen(startingIntent);
    }
  }

[kevin-zqw]

@argzdev @gsakakihara

Thanks so much! Hope Firebase will fix this bug in the future.

In the mean time, as @gsakakihara said, I have solved this issue in my App by calling logNotificationOpen() in my MainActivity’s onNewIntent().

[gsakakihara]

This appears to be a bug as it’s intended that opening a notification should log notification_open, if enabled. Unfortunately ActivityLifecycleCallbacks doesn’t have a callback for onNewIntent(), so the FCM SDK would not be able to log notification open in that way. There may be some other ways to try to handle this, but even if we decide on a fix, I don’t know how long it might take to be included in a release.

In the meantime, I think that you should be able to work around this by copying logNotificationOpen() from FcmLifecycleCallbacks and calling it in your Activity’s onNewIntent().

https://github.com/firebase/firebase-android-sdk/blob/a283019216f4987fd4fbb806141d3540f28f53c3/firebase-messaging/src/main/java/com/google/firebase/messaging/FcmLifecycleCallbacks.java#L79