[firebase_messaging] onMessage/onResume is called twice on Android/iOS

[woprandi]

Describe the bug The onMessage callback is always called twice

To Reproduce Steps to reproduce the behavior:

1. Setup the plugin, do a print statement in the onMessage callback
2. Keep the app in the foreground
3. Send a FCM message
4. 2 print on the console

Expected behavior Only one print on the console

Additional context I don' t have the same issue with onBackgroundMessage. It's called once as expected

[dhakadv06]

Facing same issue. onResume and onLaunch works fine but onMessage triggers twice.

[brian2694]

Facing same issue.!

[hoahuathien]

Facing the same problem with onMessage and onResume.

[rodrigolmacedo]

Same issue here, its is boring, in other app with other version the bug dont occurs T_T

[scognito]

I confirm (firebase messaging 6.0.9, and flutter 1.12.13+hotfix.5) but it happens only on Android, not iOS.

[eyoeldefare]

Only on the android, it seems to me. Its easy to handle programmatically but not sure if there's a clean way to deal with it.

[CoderJava]

Facing same issue.

[woprandi]

I confirm it's only on Android

[woprandi]

onResume is also called twice

[sergitovar91]

Here the same issue, I get duplicate notifications on android (onResume and OnMessage). Here you will find all my details. It is the default flutter project with firebase firebase_messaging: ^6.0.9

Output: W/FirebaseMessaging( 7129): Unable to log event: analytics library is missing W/FirebaseMessaging( 7129): Unable to log event: analytics library is missing I/flutter ( 7129): onMessage: {notification: {title: prueba, body: prueba}, data: {click_action: FLUTTER_NOTIFICATION_CLICK}} I/flutter ( 7129): onMessage: {notification: {title: prueba, body: prueba}, data: {click_action: FLUTTER_NOTIFICATION_CLICK}}

flutter.txt code.txt

[janosdupai]

same issue on iOS. onMessage called twice with different message ID, so there could be the issue on server side. I double checked that my php call run only once, but somehow I received 2 message. In both cases: foreground and background too....

[EverestBoy]

Same here, on Message is called twice, flutter team are you listening?

[woprandi]

@janosdupai I don't have this issue on iOS. I tested again today

[janosdupai]

@woprandi I use Firebase Cloud Message for a Flutter app.

I try to trigger a push notification with php code. It give me a success: 1 result, but on my device I always receive 2 message with the same title&body but different message ID (which is provided by google firebase).

I double checked, that I trigger this function only once on a server side.

my code on the server

    $url = 'https://fcm.googleapis.com/fcm/send';
     $msg = array
          (
                'body'  => $message,
                'title' => $title,
                        'badge' => 1,/*Default sound*/
                        'sound' => 'default',
          );
    $fields = array
            (
                'registration_ids' => $id,
                'notification'  => $msg
            );

    $fields = json_encode ( $fields );

    $apiKey = 'XXXXXXX'; //IOS

    $headers = array (
            'Authorization: key='.$apiKey,
            'Content-Type: application/json'
    );

    $ch = curl_init ();
    curl_setopt ( $ch, CURLOPT_URL, $url );
    curl_setopt ( $ch, CURLOPT_POST, true );
    curl_setopt ( $ch, CURLOPT_HTTPHEADER, $headers );
    curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, true );
    curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, false );
    curl_setopt ( $ch, CURLOPT_POSTFIELDS, $fields );

    $result = curl_exec ( $ch );
    curl_close ( $ch );
        echo $result;

I tried to trigger this from Terminal, which worked fine, and sent only 1 message. My terminal code:

DATA='{"notification": {"body": "this is a body","title": "this is a title"}, "priority": "high", "data": {"click_action": "FLUTTER_NOTIFICATION_CLICK", "id": "1", "status": "done"}, "to": "MYDEVICETOKEN"}' curl https://fcm.googleapis.com/fcm/send -H "Content-Type:application/json" -X POST -d "$DATA" -H "Authorization: key=XXXXXXXXX"

[woprandi]

@janosdupai Can you check the FCM response via curl -i ?

[janosdupai]

@woprandi

{"multicast_id":8502274311835153380,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"1579683773320267"}]}

I receive this message_id in flutter app, but I receive another one in a small delay (with same message title and body)....

on flutter console

flutter: {status: done, id: 1, click_action: FLUTTER_NOTIFICATION_CLICK, google.c.a.e: 1, gcm.message_id: 1579683773320267, aps: {alert: {title: This is title #1, body: here is a message. message}, sound: default}} flutter: {status: done, id: 1, click_action: FLUTTER_NOTIFICATION_CLICK, google.c.a.e: 1, gcm.message_id: 1579685542411682, aps: {alert: {title: This is title #1, body: here is a message. message}, sound: default}}

[CoderJava]

I'm test used terminal but the result it's same. onMessage is called twice. I'm testing on Android device.

[scognito]

@woprandi

{"multicast_id":8502274311835153380,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"1579683773320267"}]}

I receive this message_id in flutter app, but I receive another one in a small delay (with same message title and body)....

on flutter console

flutter: {status: done, id: 1, click_action: FLUTTER_NOTIFICATION_CLICK, google.c.a.e: 1, gcm.message_id: 1579683773320267, aps: {alert: {title: This is title #1, body: here is a message. message}, sound: default}} flutter: {status: done, id: 1, click_action: FLUTTER_NOTIFICATION_CLICK, google.c.a.e: 1, gcm.message_id: 1579685542411682, aps: {alert: {title: This is title #1, body: here is a message. message}, sound: default}}

I receive it two times even from terminal

[sudip92]

Facing same issue with firebase_messaging: ^6.0.9. onMessage and onResume called multiple times

[eyoeldefare]

Same here, on Message is called twice, flutter team are you listening?

Can you imagine how many issues there are under this package? You need to be more appreciative of their craft bro. They can't solve everything overnight, give them some time.

[woprandi]

After fast investigation, the method onAttachedToEngine of the class FirebaseMessagingPlugin, which call registerReceiver, is called twice. That explain the double call. I will try to continue to investigate but I'm not an expert

[woprandi]

A working workaround :

class MainActivity: FlutterActivity() {
   /*  override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }*/
}

[mklim]

Thanks @woprandi for filing the issue and diagnosing this! Just as a warning, that workaround should fix this specific bug for firebase_messaging but may cause issues in other plugins like google_maps_flutter because of a bug with the current registration flow. We're tracking the larger issue at flutter/flutter#49365.

[woprandi]

@mklim Thanks for the info, I wasn't able to find the goal of the MainActivity content.

[hp1227]

@mklim is there any updates?

[mklim]

@hp1227 yes. The fixes for the underlying issue have rolled into Flutter as of flutter/flutter@4fbb85e0c207132e0ed9130d7410784c00f0d066, but aren't on any of the channels besides master. I'm hoping to be able to hotfix this into stable, but don't have news to report on that front yet.

The root cause of this is flutter/flutter#49365. I think this issue is still worth keeping open in case firebase_messaging can work around the underlying Flutter problem individually, but that's probably the right bug to track for updates on the issue for now.

[woprandi]

Thanks for your work @mklim

[davidwilcox]

I just tried against master (looks like the commit is not yet merged to stable), and it worked for me!

[rodrigolmacedo]

I just tried against master (looks like the commit is not yet merged to stable), and it worked for me!

here too, but with backgroundmessage register bug.

[viniciusroland]

woprandi comment solves the issue for android, but how to solve the same issue for iOS?

[noobcoder17]

A working workaround :

class MainActivity: FlutterActivity() {
   /*  override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }*/
}

This works for me in Android.

[kbrmimbyl]

We're on Flutter 1.12.13+hotfix.7 and facing this issue right now. Is this bug fixed in 1.12.13+hotfix.8?

[ghost]

We're on Flutter 1.12.13+hotfix.7 and facing this issue right now. Is this bug fixed in 1.12.13+hotfix.8?

I am running 1.12.13+hotfix.8 on stable and it still does not work. Installing fvm to switch between master and stable.

[fxsalazar]

I'm running v1.12.13+hotfix.8 but with firebase_messaging: ^5.1.6 because when trying to update to v6.x the notifications on iOS stoped working. Not really sure where or what has the issue.

[pdelgadohurtado]

Still not working in flutter v1.12.13+hotfix.8 with firebase_messaging: ^6.0.12

[nizarhmain]

Tried it with flutter v1.15.19 dev. It seems to work for me https://storage.googleapis.com/flutter_infra/releases/dev/windows/flutter_windows_v1.15.19-dev.zip

[ghost]

Yes, the master branch seems fine

[schankam]

When will this be merged to Stable ? Any updates ? As of today, the problem still persist.

[woutergoossens]

When will this be in the stable version?

[p30arena]

firebase_messaging 6.0.13 Flutter (Channel master, v1.16.4-pre.52, on Microsoft Windows [Version 6.3.9600], locale en-US)

[lucas-sesti]

@p30arena the version 6.0.13 is correct ? i'm using and still calling twice in the onResume and others...

[p30arena]

@lucas-sesti

maybe you should check your server logic, I've tested it in two production apps on Android and iOS.

[lucas-sesti]

But in not stable channel of flutter alright? I'm using the Stable channel, now i see you said: "Flutter (Channel master, v1.16.4-pre.52, on Microsoft Windows [Version 6.3.9600], locale en-US)"...

[lexyfeito]

Hi, any ideas when this will be merge to stable?

[tzvc]

Any ETA on the merge to stable? :)

[Danaru87]

Not resolved with flutter 1.12.13+hotfix.9.

Any news about merging into stable version ?

[vinkalathmin]

This is very serious issue. Is there there any work around, we have an urgent release. Please help

[braindamagedman]

Hello guys. I think, after flutter upgrade to 1.12, you need to migrate your projects following this guide: https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects#full-flutter-app-migration

body of the MainActivity is now empty

The new FlutterActivity no longer requires manually registering your plugins. It will now perform the registration automatically when the underlaying FlutterEngine is created.

[huulbaek]

I'm doing something like this:

if ((DateTime.now().microsecondsSinceEpoch - _lastOnResumeCall) > 1000000) {
  _lastOnResumeCall = DateTime.now().microsecondsSinceEpoch;
  _navigateToItemDetail(message);
}

Essentially testing how long since the callback was last reached. If some amount of time has passed we proceed.

[mtannerfors]

Fixed and working well on flutter beta. Thanks @mklim!