Android Question Show a busy gif while loading app

Sub Activity_Create(FirstTime As Boolean)
    
    LogColor("arrancamos...",Colors.Blue)
    TimeZone = DateTime.GetTimeZoneOffsetAt(DateTime.Now)
    HoraInicioMercado=11+3+TimeZone
    HoraFinMercado   =18+3+TimeZone
    
    If FirstTime = True Then
        Try
            manager.Initialize("manager", key)
            manager.DebugLogging = True
        Catch
            Log("Imposible lanzar billing")
        End Try       
    End If
    LogColor("billing ok...",Colors.Blue)
    
    Sleep(100)
    Activity.LoadLayout("paginicio")
    Activity.Initialize("Main")
    Activity.Title = "PortIt"