Android Question Oneshot delay to display an image

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Dim greenled, redled As Bitmap
    Private ImageView1 As ImageView
    Private Button1 As Button
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("Layout1")
    greenled.Initialize(File.DirAssets,"green-control-md.png")
    redled.Initialize(File.DirAssets,"led-red-control-md.png")

End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub


Sub Button1_Click
    ImageView1.Bitmap = greenled
    Starter.csu.CallSubPlus(Me, "Sub_1", 2000)
End Sub

Sub sub_1
    ImageView1.Bitmap = redled   
End Sub