Android Question Firebase notification issue with app closed

[juacochero]

Hi everyone!
I have gone over all the tutorials/questions I could find in the forums and still can't make this work properly.
I have a php page that sends a push notification through Firebase to my B4A app. The notification displays perfectly if I have the app on, but they do not appear if I have the app closed (swipe closed that is, force closed).

Any idea how I can fix this? Thank you so much!

My App Code goes as follows.
In Starter Service:

Sub Service_Create
    CallSubDelayed(FirebaseMessaging, "SubscribeToTopics")
End Sub

In FirebaseMessaging Service

#Region  Service Attributes
    #StartAtBoot: True
#End Region

Sub Process_Globals
    Public fm As FirebaseMessaging
End Sub

Sub Service_Create
    fm.Initialize("fm")
End Sub

Public Sub SubscribeToTopics'************ Google Play Services Base ************
    fm.SubscribeToTopic("general") 'you can subscribe to more topics
    Log (fm.Token)
End Sub

Sub Service_Start (StartingIntent As Intent)
    If StartingIntent.IsInitialized Then fm.HandleIntent(StartingIntent)
    Sleep(0)
    Service.StopAutomaticForeground
    
End Sub

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"), Main)
    n.Notify(1)
End Sub

Sub Service_Destroy

End Sub

My php Function (Removed my API key) in a server

function notify ($deviceID, $t, $noti)
    {
    // API access key from Google API's Console
        if (!defined('API_ACCESS_KEY')) define( 'API_ACCESS_KEY', 'MY API KEY GOES HERE' );
        $tokenarray = array($deviceID);
        // prep the bundle
        $msg = array
        (
            'title'     => $t,
            'body'     => $noti,
            'MyKey1'       => 'MyData1',
            'MyKey2'       => 'MyData2',
          
        );
        $fields = array
        (
            'registration_ids'     => $tokenarray,
            'data'            => $msg
        );
        
        $headers = array
        (
            'Authorization: key=' . API_ACCESS_KEY,
            'Content-Type: application/json',
        );
        
        $ch = curl_init();
        curl_setopt( $ch,CURLOPT_URL, 'fcm.googleapis.com/fcm/send' );
        curl_setopt( $ch,CURLOPT_POST, true );
        curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
        curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
        curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
        curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
        $result = curl_exec($ch );
        curl_close( $ch );
        return $result;
    }

And finally app manifest:

AddManifestText(
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="26"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")

CreateResourceFromFile(Macro, FirebaseAnalytics.GooglePlayBase)
CreateResourceFromFile(Macro, FirebaseAnalytics.Firebase)
CreateResourceFromFile(Macro, FirebaseNotifications.FirebaseNotifications)

 

[Erel]

1. Your PHP code is not relevant. You need to start exactly like in the tutorial and send the messages with the B4J code.

2. Make sure to run your app in release mode.

3. On some devices your app will not be able to start if it is explicitly killed by the user.

 

[juacochero]

Thank you Erel,
1. Yes, I used the B4J code first and I had the exact same issue, following the tutorial step by step.
2. It is indeed in release mode.
3. That is a problem. How do other apps that have push notifications (Whatsapp, Facebook, etc.) manage this? When I explicitly kill those they do still show the notifications.

Thanks again

 

[Erel]

Some devices hold an internal whitelist of popular apps.

 

[juacochero]

Some devices hold an internal whitelist of popular apps.

Ok Thanks Erel. Cheers!