Flutter/Firebase - How to get "heads up" notification on Android?

Question

I have a Flutter application using the firebase-messaging plugin for push notifications.

I register firebase like normal on the client, and I send the fcmToken to the server.

Notifications are created via a python server using aiofcm (which uses firebase's XMPP api). They're created like this:

message = aiofcm.Message(
    device_token = t2,
    notification = {
        "title":notification_title,
        "body":notification_body,
        "sound":"default",
        "tag":link
    },
    data = {
        "click_action": "FLUTTER_NOTIFICATION_CLICK"
    },
    priority=aiofcm.PRIORITY_HIGH
)
await fcm.send_message(message)

On iOS, notifications pop-up at the top of the screen.

On Android, only the icon shows up in the notification tray - not any of the notification content. This is tested on a Pixel 3 and a OnePlus 6, both running Android P.

Ideally, I would like the notification to be "heads-up" style like this:

Before I was able to accomplish this using data messages and creating the notification programmatically in native android, however I would like to avoid that if possible since data messages don't get delivered on Android if the app is terminated.

Answer 1

To Get heads-up - Notification - Kindly set "alert: true"

Example :

notification = {
    "title":notification_title,
    "body":notification_body,
    "sound":"default",
    "alert" : true
    "tag":link
},