Android Question push message foreground vs background

[paul fredrick]

why the push message with the app in background is correct and when is in foreground the message display null ?
thanks

 

[KMatle]

Depends on what kind of message you send (data/notification/mixed). Can you post the send parms? How do you send it (php/B4J?)

 

[paul fredrick]

this code sends the message correctly with some parameters in the 'data' section that are then handled by the app and saved on a sqllite table.
This happens correctly if the app is in the background, if in foreground the message is null.
Sending is done with B4J app (non-UI)

Private Sub SendMessageToSingleDevice(Devtoken As String)

    Dim Job As HttpJob
    Job.Initialize("SendMessage", Me)

    Dim m As Map = CreateMap("to": $"${Devtoken}"$)
    Dim noti As Map = CreateMap("body":p2, "title":p3, "sound": "default")
    Dim data As Map = CreateMap("id":p4, "tr":p5, "tp":p6, "qt":p7, "sound": "default")
    m.Put("notification", noti)
    m.Put("data", data)
    m.Put("content_available": True)
    m.Put("priority", 2)
    m.Put("DefaultVibrate": True)

    Dim jg As JSONGenerator
    jg.Initialize(m)
    Job.Tag=jg
    Log(jg.ToString)
    Job.PostString("https://fcm.googleapis.com/fcm/send", jg.ToString)
    Job.GetRequest.SetContentType("application/json;charset=UTF-8")
    Job.GetRequest.SetHeader("Authorization", "key=" & API_KEY)

End Sub

 

[Erel]

There is no different between foreground and background modes. In both modes your app starts and the message reaches fm_MessageArrived. Check the logs. The message data should be logged.

 

[paul fredrick]

I did some tests and the 'null' message (in the status bar) occurs when the app is visible in the foreground, although there are data in the 'fm_MessageArrived' log.
In all other cases, the message arrives correctly.
This is the fm_MessageArrived code:

Sub fm_MessageArrived (Message As RemoteMessage)
    Log("Message arrived")
    Log($"Message data: ${Message.GetData}"$)
    Dim n As Notification
    n.Initialize
    n.Icon = "icon"
    n.SetInfo(Message.GetData.Get("title"), Message.GetData.Get("body"), "")
    n.Notify(1)
    n.Sound=True
    n.Vibrate=True
End Sub

log:
Message data: {id=myp4, qt=myp7d, tp=myp6, tr=myp5, sound=default}

missing 'title' and 'body' but it also happens when the message arrives correctly

 

[paul fredrick]

    Log($"Message title: ${Message.GetData.Get("title")}"$)
    Log($"Message body: ${Message.GetData.Get("body")}"$)
    Log($"Message data: ${Message.GetData}"$)

log:

Message title: null
Message body: null
Message data: {id=myp4, qt=myp7d, tp=myp6, tr=myp5, sound=default}

title and body is ever null (background or foreground) but in background i see title and body in message status bar

 

[Erel]

Try it with FCM_PUSH program: https://www.b4x.com/android/forum/t...s-firebase-cloud-messaging-fcm.67716/#content
Without changing anything except of the server key.

 

[paul fredrick]

thanks Erel for all,
what you say I did it first to take the first steps, now I have experienced many other things and I came to understand that the message sent with B4J app to trigger 'message_arrived' in all cases, you need to send only data .
In this way I get what interests me, the data always arrive, both with the application in the background, and in the foreground.
If the notification is active in B4J, the data only arrives with the application in the foreground.
So I ask you one thing:
in this mode (data only) the notification in the status bar does not give the possibility to open anything and remains persistent. (even if you try to intercept in 'activity_resume')

can I get data-only notification open something?

 

[Erel]

You can send whatever you like in the data and you can show any type of notification.