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Parsing a YouTube sketch in an iframe with Jsoup

I would like to display the default thumbnail image of this YouTube URL in an Android app:

<iframe width="560" height="315" src="https://www.youtube.com/embed/FXx_gbdIUKg" frameborder="0" allowfullscreen=""></iframe>

This is my method for doing this:

  static String parseThumbnail(String youTubeURL){
        org.jsoup.nodes.Document document = Jsoup.parse(youTubeURL);
        Elements youtubeElements = document.select("FXx_gbdIUKg");
        org.jsoup.nodes.Document iframeDoc =  Jsoup.parse(youtubeElements.get(0).data());
        Elements iframeElements = iframeDoc.select("iframe");
    return iframeElements.attr("http://img.youtube.com/vi/"+youtubeElements+"/default.jpg");

the iframe is inside the "content: encoded" node, so I call this method here.

String itemYouTubeImage = null;

                 if (XML_TAG_CONTENT_ENCODED.equalsIgnoreCase(tag)) {
                        String contentEncoded = tagNode.getTextContent();
                        itemYouTubeImage = parseThumbnail(contentEncoded);
                        itemImageURL = parseImageFromHTML(contentEncoded);
                        itemContentEncodedText = parseTextFromHTML(contentEncoded);

How to do it right?

One of the problems is that the compiler tells me that the value parseThumbnail(contentEncoded)assigned itemYouTubeImageis never used

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1 answer

If you want only the default thumbnail, this is indicated in the <head>YouTube HTML document. It is not encoded.

<link itemprop="thumbnailUrl" 
    href="https://i.ytimg.com/vi/2qhzsn3pZgk/maxresdefault.jpg">

To select an attribute value and get an absolute URL:

    String youtubeUrl = "https://www.youtube.com/watch?v=9wpqE8OSWrU";

    Document doc = Jsoup.connect(youtubeUrl).get();

    String thumbnailUrl = doc
            .select("link[itemprop=thumbnailUrl]")
            .first()
            .absUrl("href");

    System.out.println(thumbnailUrl);

Output

    https://i.ytimg.com/vi/9wpqE8OSWrU/maxresdefault.jpg

Jsoup.

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