Android Question [SOLVED] VB.NET send Null notification to android (Firebase)

makis_best · Mar 4, 2020

Hi.

I want through a VB.NET application I created
to send notification messages to all users they
use my Android application using Firebase services.

My code working fine and notification messages take place
but only when Android application running in the background
or the application is closed. If the application is running then
the notifications come writing only Null on body and tittle.

What I am missing here?
Is there something else I need to look after?

The Json I use is like that.

B4X:

Dim data = New With {
                .[to] = deviceId,
                .notification = New With {
                    .body = MaterialComment,
                    .title = "Αλλαγές τιμών.",
                    .sound = "Enabled",
                    .click_action = "Main"
                }
            }

Peter Simpson · Mar 4, 2020

@makis_best not unless you have a good reason not to do so, If I were you I would be using firebase push notifications.

I developed a solution for one of my clients a couple of years ago which works 100% perfect 100% of the time. You might find it a lot easier to use a B4J application to push notifications to either Android or iOS devices.

FirebaseNotifications - Push messages / Firebase Cloud Messaging (FCM)

Updated tutorial: https://www.b4x.com/android/forum/threads/b4x-firebase-push-notifications-2023.148715/ Clarification: The nice thing about FCM is that your app doesn't need to run in order to receive messages. The FirebaseMessaging receiver will be started by the OS when a new message...

www.b4x.com

makis_best · Mar 4, 2020

@Peter Simpson thank you for your reply.
The exact example I use from Android part.
I just can't use B4J example cuz the VB.Net
application already used for years now and do
many many things. One of all that things to do
are and notification messages.

I don't want to use two separate apps...

Jorge M A · Mar 4, 2020

Have you tried to send notification with "priority" : "HIGH" ?

aeric · Mar 5, 2020

How about adding title and body to data?

B4X:

Dim data = New With {
                .[to] = deviceId,
                .title = "Αλλαγές τιμών.",
                .body = MaterialComment,
                .notification = New With {
                    .title = "Αλλαγές τιμών.",
                    .body = MaterialComment,                  
                    .sound = "Enabled",
                    .click_action = "Main"
                }
            }

You can also check my VB.NET code

makis_best · Mar 5, 2020

Jorge M A said:
Have you tried to send notification with "priority" : "HIGH" ?

Yes... I try already... Nothing change.

Erel · Mar 5, 2020

First step is to use the B4J code to send the messages. Once you see that it works you should compare the JSON string that the B4J code creates to the one that your VB .Net program creates.

makis_best · Mar 5, 2020

@aeric I check your code and we don't have differences.
Actually your code work both ways?

makis_best · Mar 5, 2020

@Erel I use B4J code and work fine.
I did exactly what you said. I copy the JSON from there.

Erel · Mar 5, 2020

All that I can say is that your VB .Net code is wrong. If the json was correct then it would have worked.

You know the correct solution: switch to B4J.

aeric · Mar 5, 2020

makis_best said:
@aeric I check your code and we don't have differences.
Actually your code work both ways?

What do you mean both ways? Do you mean "notification" and "data" ?
Let us understand, if we send notification, we only can send title and body (and set sound), the notification sent by Firebase Push Notification does not carry any "payload".
That is why it is a better way to send "data" and let B4A app to handle the "message" in fm_MessageArrived() sub and raise an internal notification.

makis_best · Mar 5, 2020

@aeric you correct... After I change

B4X:

.notification = New With {

to

B4X:

.data = New With {

everything works as it should be.

Thank you all for your help.

Bladimir Silva Toro · Apr 21, 2020

Hi @makis_best

Can you give me an example in VB.NET of how to send the notification by FireBase

If you want, can you inform me how can I do it? I only have the example in B4J

I appreciate you so much

makis_best · Apr 21, 2020

Bladimir Silva Toro said:
Hi @makis_best

Can you give me an example in VB.NET of how to send the notification by FireBase

If you want, can you inform me how can I do it? I only have the example in B4J

I appreciate you so much

Check @aeric solution on post #5 I did exactly the same.
If you have problem I am here to help.

Bladimir Silva Toro · Apr 21, 2020

Thank you very much you are the best @makis_best

ddefrain · Sep 24, 2021

makis_best said:
@aeric you correct... After I change

B4X:

.notification = New With {

to

B4X:

.data = New With {

everything works as it should be.

Thank you all for your help.

In a few words firebase tooks the notification word as a command (I think), use a different word
Thank you very much
Best regards!!!

aeric · Sep 25, 2021

You may also want to check my code at GitHub:

GitHub - pyhoon/firebase-vbnet: Firebase push notification send to topic (VB.NET)

Firebase push notification send to topic (VB.NET). Contribute to pyhoon/firebase-vbnet development by creating an account on GitHub.

github.com

Android Question [SOLVED] VB.NET send Null notification to android (Firebase)

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