Android Question in code ListView property Change

Sub Process_Globals
End Sub

Sub Globals
    Private Button1 As Button
    Private EditText1 As EditText
    Private ListView1 As ListView
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout1")
    EditText1.Text = 20
    ListView1.SingleLineLayout.Label.TextSize = EditText1.Text
    ListView1.SingleLineLayout.ItemHeight = EditText1.Text*4
    For i = 0 To 10
        ListView1.AddSingleLine("Item No "&i)
    Next
End Sub

Sub Activity_Resume
End Sub

Sub Activity_Pause (UserClosed As Boolean)
End Sub

Sub ShowList
    ListView1.Clear
    ListView1.SingleLineLayout.Label.TextSize = EditText1.Text
    ListView1.SingleLineLayout.ItemHeight = EditText1.Text*4
    For i = 0 To 10
        ListView1.AddSingleLine("Item No "&i)
    Next
End Sub

Sub Button1_Click
    ShowList
End Sub