refresh item list in spinner

You should also Add the item to the Spinner with:
Best regards.

You should clear the spinner with Spinner1.Clear, then refill it from the file.

when the activity is focused the spinner is filled with a list from file using:

cbItem.Initialize("cbItem")
cbItem.TextSize=20
Dim TRA As TextReader
TRA.Initialize(File.OpenInput(File.DirDefaultExternal,"Choix.ndf"))
Dim line As List
line = TRA.ReadList
Log("Combo lignes ; " & line)
TRA.Close
cbItem.Clear
For i = 0 To line.Size - 1
cbItem.Add(Main.trans.GetText(line.Get(i)))
Next
'cbItem.Invalidate
cbItem.Prompt=Main.trans.GetText("Choisir")

the user can choose "add Item" from the spinner to add new item. this item is added to the file and do again

cbItem.Initialize("cbItem")
cbItem.TextSize=20
Dim TRA As TextReader
TRA.Initialize(File.OpenInput(File.DirDefaultExternal,"Choix.ndf"))
Dim line As List
line = TRA.ReadList
Log("Combo lignes ; " & line)
TRA.Close
cbItem.Clear
For i = 0 To line.Size - 1
cbItem.Add(Main.trans.GetText(line.Get(i)))
Next
'cbItem.Invalidate
cbItem.Prompt=Main.trans.GetText("Choisir")

But the spinner list is not refresh. I have to close activity and go back to the activity to refresh the list.

How to refresh the spinner list without to close activity ?

You should call:
cbItem.Initialize("cbItem")
only one time in Activity_Create.

Best regards.