Italian B4I Inviare un messaggio ad un numero tramite Whatsapp

If Edittel.Text.Length < 9 Then
        xui.MsgboxAsync("Numero di telefono non inserito! o incompleto","Attenzione")
        Return
    Else
    testo= "Salve, ......."" 
    Dim Intent1 As Intent
    Intent1.Initialize(Intent1.ACTION_VIEW, $"https://api.whatsapp.com/send?phone=${Edittel.text}&text=${testo}"$)
    StartActivity(Intent1)

    End If

   Dim avc As ActivityViewController
   avc.Initialize

   Dim avc As ActivityViewController
   avc.Initialize2

Dim stringurl As String
    testo= "Salve, ..........."
    Dim avc As ActivityViewController
    avc.Initialize("avc", Array(testo))
    avc.Show(B4XPages.GetNativeParent(Me), Root) 'Second parameter is relevant for iPad only. The arrow will point to the view.
    Wait For avc_Complete (Success As Boolean, ActivityType As String)

    If App.CanOpenUrl (stringUrl) Then
            App.OpenUrl (stringUrl)
        Else
            ' Ask to install WhatsApp
       End If