Android Question How to get permanent notifications so that the user must read them

Sub MessageArrived (Intent As Intent)
   Dim From, CollapseKey, Data As String 'ignore
   If Intent.HasExtra("from") Then From = Intent.GetExtra("from")
   If Intent.HasExtra("data") Then Data = Intent.GetExtra("data")
   If Intent.HasExtra("collapse_key") Then CollapseKey = Intent.GetExtra("collapse_key")
   Log(Intent.ExtrasToString)
   'Here you should handle the new message:
   Log("New message arrived: " & Data)
   ToastMessageShow("New message: " & Data, True)
   Dim n As Notification
   n.Initialize
   n.Icon = "icon"
   n.Sound = True
   n.SetInfo(Data, Data, Main)
   n.Notify(1)
End Sub