Android Question Vb.Net to B4A

        Public Shared Function AppendOneByteCheckSumToCmd(ByVal sourceCmd As Byte()) As Byte()
            Dim num As Byte = CalcOneByteCheckSum(sourceCmd, 0, (sourceCmd.Length - 1))
            Dim destinationArray As Byte() = New Byte((sourceCmd.Length + 1)  - 1) {}
            Array.Copy(sourceCmd, destinationArray, sourceCmd.Length)
            destinationArray((destinationArray.Length - 1)) = num
            Return destinationArray
        End Function

        Public Shared Function CalcOneByteCheckSum(ByVal cmd As Byte(), ByVal startIndex As Integer, ByVal endIndex As Integer) As Byte
            Dim num As Integer = 0
            Dim i As Integer = startIndex
            Do While (i <= endIndex)
                num = (num + cmd(i))
                i += 1
            Loop
            Return CByte((num And &HFF))
        End Function

        Public Shared Function CalcTwoByteCheckSum(ByVal cmd As Byte(), ByVal startIndex As Integer, ByVal endIndex As Integer) As Integer
            Dim num As Integer = 0
            Dim i As Integer = startIndex
            Do While (i <= endIndex)
                If ((i Mod 2) = 0) Then
                    num = (num + cmd(i))
                Else
                    num = (num + (cmd(i) << 8))
                End If
                i += 1
            Loop
            Return (num And &HFFFF)
        End Function