Wikitude

I encountered the following problem when adding notifications to a Unity app involving Wikitude running on an Android device:

1) Open the app

2) Press the Home button to pause the app/put it in the background

3) Send a notification to the app

4) Click on the notification to bring the app to the forefront

> The app crashes and needs to be restarted

This is related to some interaction between notifications and WikitudeActivity referenced in the AndroidManifest.xml file. To investigate, I trimmed the app so there was a single, simple scene with only UI, the notification handling code, and no wikitude usage. The problem still occurred until I replaced the WikitudeActivity in the AndroidManifest.xml file with the standard UnityPlayerActivity.

Also, the following similar scenarios appear to work fine:

- In step 2, close the app instead of putting in the background.

- Pause the app and then return to it without sending a notification

- In iOS, the same scenario works fine

I'm working with the following versions:

Unity: 2017.1.1

Wikitude Unity Plugin: 7.1.0

Android: 7.0 on Samsung Galaxy S7 and 4.4.2 on HTC

Notifications package: UTNotifications from the Unity Asset Store

Anyone know a way to avoid this?  Or has anyone seen something similar?

Here are more details on how the app is being notified in this scenario:

When the user clicks on a notification, the following code is being used to activate the application (on Android):

final PackageManager packageManager = context.getPackageManager();

final Intent mainActivityIntent = packageManager.getLaunchIntentForPackage(this.getApplicationContext().getPackageName());

mainActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

mainActivityIntent.addCategory(Intent.CATEGORY_LAUNCHER);

startActivity(mainActivityIntent);

With other Activity classes, this works fine, but the WikitudeActivity crashes.  The following is in the LogCat output:

01-29 23:55:46.220 2393 4429 E ActivityTrigger: activityResumeTrigger: not whiteListeduniversal.tools.notificationsexample/com.wikitude.unity.WikitudeActivity/1  

01-29 23:55:46.382 18630 18792 F libc : Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 18792 (UnityMain)  

More of the log output is in the attached file.