Android Code Snippet [B4X] UUID version 4 Generator

Extracted from this Thread:
https://www.b4x.com/android/forum/threads/guid-vs-uuid-can-i-use-guid-as-uuid.110970/#post-692302

Sub UUIDv4 As String
   Dim sb As StringBuilder
   sb.Initialize
   For Each stp As Int In Array(8, 4, 4, 4, 12)
       If sb.Length > 0 Then sb.Append("-")
       For n = 1 To stp
           Dim c As Int = Rnd(0, 16)
           If c < 10 Then c = c + 48 Else c = c + 55
           If sb.Length = 19 Then c = Asc("8")
           If sb.Length = 14 Then c = Asc("4")
           sb.Append(Chr(c))
       Next
   Next
   Return sb.ToString.ToLowerCase
End Sub