Xamarin Forms Android push notifications "Message was successfully sent, but there were no matching targets."

Question

I am trying to setup push notifications on a Xamarin.Forms Android app following this tutorial and this sample. My AndroidManifest.xml, FirebaseService.cs and MainActivity.cs are basically the same as the sample. When I fire up the Android Emulator and do a Test Send from Azure Notification Hubs I get: "Message was successfully sent, but there were no matching targets." Is that tutorial outdated?

If you have access to a real device try running your app there and see if you have other results. — pinedax
– pinedax, Commented Jul 7, 2020 at 6:47
Thanks, that helped me get an error message: "Java.Lang.RuntimeException: 'Unable to instantiate receiver com.google.firebase.iid.FirebaseInstanceIdReceiver: java.lang.InstantiationException: java.lang.Class<com.google.firebase.iid.FirebaseInstanceIdReceiver> cannot be instantiated'" I need to figure out why this is happening. — Luis Lema
– Luis Lema, Commented Jul 7, 2020 at 17:50

Luis Lema · Accepted Answer · 2020-07-07 19:14:25Z

6

I used a real device to debug the application and I got an error message: "Java.Lang.RuntimeException: 'Unable to instantiate receiver com.google.firebase.iid.FirebaseInstanceIdReceiver: java.lang.InstantiationException: java.lang.Class<com.google.firebase.iid.FirebaseInstanceIdReceiver> cannot be instantiated'"

This was due to my code shrinker (ProGuard/R8) missing some configurations. Following this article I created a proguard.cfg file and added this:

-dontwarn com.google.android.gms.**
-keep class com.google.android.gms.** { *; }
-keep class com.google.firebase.** { *; }

I tried a Test Send from Azure Notification Hubs and it worked!

answered Jul 7, 2020 at 19:14

Luis Lema

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3 Comments

Kyle Kamperschroer Over a year ago

Thanks for following up and providing what worked! I'm glad you got it working. :)

Ron Over a year ago

@Luis Do you happen to remember what clases/libraries you needed to "keep" to make this work ? I am getting the same error and have tried multiple variations of the class names and it still keeps failing

Michal Diviš Over a year ago

Thanks! I've been using the FirebasePushNotificationPlugin in Xamarin.Forms and this resolved my problem.

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