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

Update 2019 August.

[wasted couple of days just because py doesn't support latest changes for notification]

Just add image=url into your notification object.

It works in Native Android. Just add image into notification object. Also please note that in Python library image field doesn't exist. [As of Aug 19] https://github.com/firebase/firebase-admin-python

I used PHP and this library https://github.com/kreait/firebase-php/ Its super simple and more importantly, it works for big image notification when app is in background or has been killed.

Code:

withServiceAccount($serviceAccount)->create();
$messaging = $firebase->getMessaging();

// this works when app is closed or in bg
$notification = Notification::fromArray([
    'title' => $title,
    'body' => $body,
    'image' => $imageUrl,
]);

// for foreground process 
$data = [
    'image' => $imageUrl,
    'news_id' => $news_id,
];

$topic = 'default_topic1';

$message = CloudMessage::withTarget('topic', $topic)
    ->withNotification($notification) // optional
    ->withData($data);

$messaging->send($message);

print_r($message);