Firebase Save Notification To Db Not Working When App Is Not Running

I am handling FCM notifications in my app. in like public void onMessageReceived(RemoteMessage remoteMessage) { Notification notification = new Notification(); n

Solution 1:

Firebase notifications in Android are not sent to your registered messages service when your app is in background and your notification contains a notification key. To ensure your service always handles notifications, don't use the notification field. Instead use the data field for that purpose.

Actually one downside of using Firebase's notification field is that you cannot specify a large and small icons for the system tray notification. It only lets you set one icon.

Note however that this is not a "universal" solution since iOS users will not receive a notification in background when there's no notification field present.

Having said that, I think the best solution right now is to send you Android users a notification like the following:

{
    "to":"tHt4D...",
    "data":
    {
        "title":"Nice title",
        "body":"Nice body"
    }
}

and handle it in your service like this:

publicvoidonMessageReceived(RemoteMessage remoteMessage) {
    Map<String, String> data = remoteMessage.getData();
    makeMyCustomNotification(data.get("title"), data.get("body"));
}

For iOS users use the standard way:

{
    "to":"tHt4D...",
    "notification":
    {
        "title":"Nice title",
        "body":"Nice body"
    }
}

There's a big discussion around this topic here