Android Question OnGoingEvent not working

Dim ntf As NotificationBuilder
Dim bv As Notification
ntf.Initialize
        ntf.SmallIcon = "icon"
        ntf.Ticker = "test"
        ntf.DefaultLight = True
        ntf.DefaultVibrate = True
        Dim Sound As Boolean = True
        ntf.DefaultSound = Sound
        ntf.ContentTitle = "app"
        ntf.ContentText = "test"
        ntf.SubText = "Text"
        ntf.setActivity(chat)
        ntf.AutoCancel=True
        ntf.OnGoingEvent=False
        Dim p As Phone
        If p.SdkVersion >= 26 Then
            Dim ctxt As JavaObject
            ctxt.InitializeContext
            Dim manager As JavaObject
            manager.InitializeStatic("android.app.NotificationManager")
            Dim Channel As JavaObject
            Dim importance As String
            If Sound Then importance = "IMPORTANCE_DEFAULT" Else importance = "IMPORTANCE_LOW"
            Dim ChannelVisibleName As String = Application.LabelName
            Channel.InitializeNewInstance("android.app.NotificationChannel", _
                   Array("MyChannelId1", ChannelVisibleName, manager.GetField(importance)))
            manager = ctxt.RunMethod("getSystemService", Array("notification"))
            manager.RunMethod("createNotificationChannel", Array(Channel))
            Dim jo As JavaObject = ntf
            jo.RunMethod("setChannelId", Array("MyChannelId1"))
        End If
        bv.Initialize
        bv=ntf.GetNotification
        bv.Notify(2)