Firebase Expandable Notification Show image when app is in background

Question

I am implementing FCM notifications in Android, but how does notifications differ depending on the app status (background vs. foreground)?

Answer 1

In case some lands here in 2019, you can simply add an image field to the notification object:

    {
        notification: {
            title: title,
            body: body,
            image: "http://path_to_image"
        },
        data: {
            click_action: "FLUTTER_NOTIFICATION_CLICK",
            your_data: ...,
        },
        token: token
    }

I have tested it using Flutter on Android and I would assume it works on native Android since they both probably use the same native SDK.