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Firebase Messaging Causes ANR on Notification Receive in Flutter App (Even with Minimal Handler)
I am working on a Flutter project where I have set up notifications using Firebase Messaging. Everything was working perfectly until recently. After coming back to the project after a long time and running the code again, the app crashes with an ANR (Application Not Responding) when a notification is received.
The notification is received, and the foreground handler gets the data, but then the app crashes immediately.
After debugging, I realized that once the notification is received, something takes a long time to process, which is likely causing the crash.
To investigate further, I removed all heavy tasks and left only a simple print log inside the handler—but the crash still occurs.
TL;DR
Issue: Flutter app experiencing ANR when receiving notifications through Firebase Messaging.
Solution: The ANR might be due to a delay in processing notifications. Try optimizing the code further and reducing processing time. Even with minimal code in the message handler, the crash persists. This indicates a deeper issue with the notification processing mechanism. Further debugging and profiling of the notification handling logic are required to pinpoint and resolve the cause of the ANR.