شما کد رو اینجوری بزار :
If File.Exists(File.DirInternal, "mesal.txt") = False Then
Dim verticalPosition As String = "bottom" '"top" or "bottom"
Dim horizontalPosition As String = "center" '"left", "right" or "center"
Dim r As Reflector
Dim args(3) As Object = Array As Object(r.GetActivity, verticalPosition, horizontalPosition)
Dim types(3) As String = Array As String("android.app.Activity", "java.lang.String", "java.lang.String")
r.RunStaticMethod("ir.adad.AdadB4APlugin", "createAdView", args, types)
end if