Android Question Firebase RealtimeDatabase the event onDatachange will not be raised

    Dim Firebase As FirebaseDatabase
    Dim DatosFirebase As DatabaseReference

    Firebase.Initialize("Realtime")
    Firebase.PersistenceEnabled = True
    Firebase.goOnline
    
    DatosFirebase.Initialize("Reference",Firebase.getReference2("/"),"root")
    DatosFirebase.addListenerForSingleValueEvent
    DatosFirebase.keepSynced(True)

Sub Reference_onDataChange(snapshot As Object, tag As Object)
   If snapshot <> Null Then 'Hay datos
       Dim snap As DataSnapshot' = snapshot
       snap.Initialize(snapshot)
       'Log(snapshot)
       Dim m As Map = snap.Value
         ................. etc
    End If 'Hay datos
   
End Sub