FCM - Notification Image not displaying

Open

#818 opened on Jun 4, 2023 3 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: firebase, java
Domain: api, backend

Research direction

Start with the referenced src/main/java/com/google/firebase/messaging/Notification.java and compare its image field with the linked Node.js imageUrl reference. Trace how the Notification is represented in the FCM request, then validate the supplied multicast example on iOS and Android; done means the notification image is displayed.

Written by the indexing model from the issue text.

Description

api: messaging

Describe your environment

Operating System version: macOS 13.0 (22A380)
Firebase SDK version: 9.1.1
Library version: 9.1.1
Firebase Product: Cloud Messaging (auth, database, storage, etc)

Steps to reproduce:

Images are not displayed on devices (both iOS and Android) when sending notifications with FCM.
I set the image URL using the Notification Builder.

List<String> fcmTokens = List.of(...);

Notification notification = Notification.builder().setTitle("Hello").setBody("world").setImage("https://e-cdns-images.dzcdn.net/images/cover/f2d3db07f3f045a048cdacf53b5cf9dd/250x250-000000-80-0-0.jpg").build();

MulticastMessage message = MulticastMessage.builder()
                .setNotification(notification)
                .addAllTokens(fcmTokens).build();

BatchResponse response = FirebaseMessaging.getInstance().sendMulticast(message);

Note that I receive the notification on the devices, only the image is not displayed. I am able to see the image in the notification when sending it using the Firebase Console.

When investigating the issue, I discovered that other SDKs use imageUrl instead of image attribute.
For example, for NodeJS: https://firebase.google.com/docs/reference/admin/node/firebase-admin.messaging.notification.md#notificationimageurl

The Java SDK still uses the image key instead of imageUrl: https://github.com/firebase/firebase-admin-java/blob/master/src/main/java/com/google/firebase/messaging/Notification.java#L33

Dominant language: Java
Stars: 620
Forks: 305
Avg merge: 3h 23m
Merged PRs (30d): 1

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