(i know its an old thread but i was looking for how to share a text in whatsapp and this is what i found so i wanted to share the piece of code how to do that)
to share text in whatsapp do it like this:
B4X:
Dim txt As String = "Hello%2C%20World!"
Dim url As String = "whatsapp://send?text=" & txt
If App.CanOpenUrl(url) Then App.OpenUrl(url)