basic notification doesn't work when the app is background

I use standart notification. It works when the app is foreground. But it doesn't work when the app is background. What should I do?

Code:

  Sub Process_Globals
Dim n As Notification
End Sub

Sub Activity_Create(FirstTime As Boolean)
n.Initialize
End Sub

Sub JobDone (Job As HttpJob)
Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
If Job.Success = True Then
Select Job.JobName
Case "Job1"
'print the result to the logs...  

basic notification doesn't work when the app is background

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