Android Question Firebase Cloud Messaging [CLOSED]

AddManifestText(
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="19"/>
<supports-screens android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:anyDensity="true"/>)
SetApplicationAttribute(android:icon, "@drawable/icon")
SetApplicationAttribute(android:label, "$LABEL$")
'End of default text.

'************ Google Play Services Base ************
AddApplicationText(
   <activity android:name="com.google.android.gms.common.api.GoogleApiActivity"
  android:theme="@android:style/Theme.Translucent.NoTitleBar"
  android:exported="false"/>
    <meta-data
  android:name="com.google.android.gms.version"
  android:value="@integer/google_play_services_version" />
)
'************ Google Play Services Base (end) ************

'************ Firebase Base ************
CreateResourceFromFile("google-services", "google-services.json")
AddPermission(android.permission.ACCESS_NETWORK_STATE)
AddPermission(android.permission.INTERNET)
AddPermission(android.permission.WAKE_LOCK)
AddPermission(com.google.android.c2dm.permission.RECEIVE)
AddPermission(${applicationId}.permission.C2D_MESSAGE)
AddManifestText( <permission android:name="${applicationId}.permission.C2D_MESSAGE"
  android:protectionLevel="signature" />)
AddApplicationText(
<receiver
  android:name="com.google.android.gms.measurement.AppMeasurementReceiver"
  android:enabled="true">
  <intent-filter>
  <action android:name="com.google.android.gms.measurement.UPLOAD"/>
  </intent-filter>
  </receiver>

  <service
  android:name="com.google.android.gms.measurement.AppMeasurementService"
  android:enabled="true"
  android:exported="false"/>
   <provider
  android:authorities="${applicationId}.firebaseinitprovider"
  android:name="com.google.firebase.provider.FirebaseInitProvider"
  android:exported="false"
  android:initOrder="100" />
    <receiver
  android:name="com.google.android.gms.measurement.AppMeasurementReceiver"
  android:enabled="true">
  <intent-filter>
  <action android:name="com.google.android.gms.measurement.UPLOAD"/>
  </intent-filter>
  </receiver>

  <service
  android:name="com.google.android.gms.measurement.AppMeasurementService"
  android:enabled="true"
  android:exported="false"/>
   <receiver
  android:name="com.google.firebase.iid.FirebaseInstanceIdReceiver"
  android:exported="true"
  android:permission="com.google.android.c2dm.permission.SEND" >
  <intent-filter>
  <action android:name="com.google.android.c2dm.intent.RECEIVE" />
  <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
  <category android:name="${applicationId}" />
  </intent-filter>
  </receiver>
    <receiver
  android:name="com.google.firebase.iid.FirebaseInstanceIdInternalReceiver"
  android:exported="false" />


  <service
  android:name="com.google.firebase.iid.FirebaseInstanceIdService"
  android:exported="true">
  <intent-filter android:priority="-500">
  <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
  </intent-filter>
  </service>
)
'************ Firebase Base (end) ************

'************ Firebase Notifications ************
AddApplicationText(
    <service
  android:name="com.google.firebase.messaging.FirebaseMessagingService"
  android:exported="true">
  <intent-filter android:priority="-500">
  <action android:name="com.google.firebase.MESSAGING_EVENT" />
  </intent-filter>
  </service>
   <service android:name="anywheresoftware.b4a.objects.FirebaseNotificationsService">
     <intent-filter>
  <action android:name="com.google.firebase.MESSAGING_EVENT"/>
     </intent-filter>
   </service>
)
'************ Firebase Notifications (end)************

Sub Process_Globals
    Private fm As FirebaseMessaging
End Sub

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

Public Sub SubscribeToTopics
    fm.SubscribeToTopic("x")
End Sub

Sub Service_Start (StartingIntent As Intent)
    If StartingIntent.IsInitialized And fm.HandleIntent(StartingIntent) Then Return
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

Private Sub SendMessage(Topic As String, Title As String, Body As String)
    Dim Job As HttpJob
    Job.Initialize("fcm", Me)
    Dim m As Map = CreateMap("to": $"/topics/${Topic}"$)
    Dim data As Map = CreateMap("title": Title, "body": Body)
    m.Put("data", data)
    Dim jg As JSONGenerator
    jg.Initialize(m)
    Job.PostString("https://fcm.googleapis.com/fcm/send", jg.ToString)
    Job.GetRequest.SetContentType("application/json;charset=UTF-8")
    Job.GetRequest.SetHeader("Authorization", "key=" & Main.API_KEY)
End Sub

Sub JobDone(job As HttpJob)
    Log(job)
    If job.Success Then
        Log(job.GetString)
    End If
    job.Release
End Sub

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

Sub Activity_Create(FirstTime As Boolean)
    CallSub(FirebaseMessaging, "SubscribeToTopics")
End Sub

Private Sub SendMessage(Topic As String, Title As String, Body As String)
    Dim Job As HttpJob
    Job.Initialize("fcm", Me)
    Dim m As Map = CreateMap("to": $"/topics/${Topic}"$)
    Dim data As Map = CreateMap("title": Title, "body": Body)
    m.Put("data", data)
    Dim jg As JSONGenerator
    jg.Initialize(m)
    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