Android Question Heartbeatview does not compile

Private Sub AnimateHeart
    Dim SmallSize As Int = 100dip
    Dim LargeSize As Int = 130dip
    Dim cx = imgHeart.Left + imgHeart.Width / 2, cy = imgHeart.Top + imgHeart.Height / 2 As Int
   
    Dim StartTime As Long = DateTime.Now
    Do While True
        Dim PulseIntervalMs As Int = 60000 / RatePerMinute
        Dim x As Float = ((DateTime.Now - StartTime) Mod PulseIntervalMs) / PulseIntervalMs
        Dim size As Float
        If x <= 0.5 Then
            size = SmallSize + (LargeSize - SmallSize) * x * 2 'growing
        Else
            size = LargeSize - (LargeSize - SmallSize) * (x - 0.5) * 2 'shrinking
        End If
        imgHeart.SetLayoutAnimated(0, cx - size / 2, cy - size / 2, size, size)
        Sleep(10)
    Loop
End Sub

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    Private hr As HeartRate
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
     hr.Initialize
End Sub