FCM : Unable to instantiate receiver com.google.firebase.iid.FirebaseInstanceIdReceiver:

Answer 06/28/2019 Developer FAQ 4

Question:

App is crashing while receiving push notification in Oreo(8.0) only .
java.lang.RuntimeException: Unable to instantiate receiver com.google.firebase.iid.FirebaseInstanceIdReceiver: java.lang.ClassCastException: android.content.ContextWrapper cannot be cast to android.app.ContextImpl at android.app.ActivityThread.handleReceiver(ActivityThread.java:3236) at android.app.ActivityThread.-wrap17(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1677) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164)

Answer1:

I was facing the same issue when using Calligraphy library. Even it was crashing the first time after installing when Firebase requests a token for the first time. Not only receiving push notifications.

My error was I was overriding attachBaseContext method in my Application class to return a ContextWrapper object, but was only needed in Activities.

So to resume my solution is to remove attachBaseContext in Application class and move it or just place it into activities.

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