Flutter: How to catch "Scheme not starting with alphabetic character (at character 1)"

Question

I have a text field where I can paste text. I use this to paste URL's from the internet. If I accidentally paste a large chunk of code from my clipboard instead of normal text or URL's, it gives me the following error: Scheme not starting with alphabetic character (at character 1).

How can I catch this error so that the user has a good experience?

---

[EDIT]

There is a button with a clipboard icon that the user can tap. Here is where the error happens once this button is tapped by the user:

onTap: () async {
    if (linkTextController.text.trim() == "") {
        try {
            ClipboardData? data = await Clipboard.getData(Clipboard.kTextPlain);
            linkTextController.text = data!.text.toString();
        } catch (error) {
            print(error);
        }
    } else {
        linkTextController.text = "";
    }
    setState(() {});
},

Answer 1

Try handling the onChanged event of the TextField using official document - Handle changes to a text field

UPDATE

You might want to use hasStrings() first, given here, because the official documentation for ClipboardData class clearly states that:<br /

The system clipboard can contain data of various media types. This data structure currently supports only plain text data, in the text property.