我在使用安卓中的XML解析器时遇到问题

Question

我一直看到教程，但它没有帮助，我使用XmlPullParser，但它不断得到一个错误，应用程序显示xmlerror页面，是因为xml的格式?

我是这样做的:

public class XmlParser {
    private static final String ns = null;

    public Queue<Item> parse(InputStream in) throws XmlPullParserException, IOException {
        try {
            XmlPullParser parser = Xml.newPullParser();
            parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
            parser.setInput(in, null);
            parser.nextTag();
            return readFeed(parser);
        } finally {
            in.close();
        }
    }
    private Queue<Item> readFeed(XmlPullParser parser) throws XmlPullParserException, IOException {
        Queue<Item> resp = new LinkedList<Item>();

        parser.require(XmlPullParser.START_TAG, ns, "channel");
        while (parser.next() != XmlPullParser.END_TAG) {
            if (parser.getEventType() != XmlPullParser.START_TAG) {
                continue;
            }
            String name = parser.getName();
            if (name.equals("item")) {
                resp.add(readItem(parser));
            } else {
                skip(parser);
            }
        }
        return resp;
    }
    // This class represents a single entry (post) in the XML feed.
    // It includes the data members "title," "link," and "summary."
    public static class Item {
        public final String title;
        public final String link;
        public final String summary;
        private Item(String title, String summary, String link) {
            this.title = title;
            this.summary = summary;
            this.link = link;
        }

    }
    // Parses the contents of an entry. If it encounters a title, summary, or link tag, hands them
    // off
    // to their respective &quot;read&quot; methods for processing. Otherwise, skips the tag.
    private Item readItem(XmlPullParser parser) throws XmlPullParserException, IOException {
        parser.require(XmlPullParser.START_TAG, ns, "item");
        String title = null;
        String summary = null;
        String link = null;
        System.out.print("entrou readItem");
        while (parser.next() != XmlPullParser.END_TAG) {
            if (parser.getEventType() != XmlPullParser.START_TAG) {
                continue;
            }
            String name = parser.getName();
            if (name.equals("title")) {
                title = readTitle(parser);
            } else if (name.equals("description")) {
                summary = readDescription(parser);
            } else if (name.equals("link")) {
                link = readLink(parser);
            } else {
                skip(parser);
            }
        }
        return new Item(title, summary, link);
    }
    // Processes title tags in the feed.
    private String readTitle(XmlPullParser parser) throws IOException, XmlPullParserException {
        System.out.print("entrou title");
        parser.require(XmlPullParser.START_TAG, ns, "title");
        String title = readText(parser);
        parser.require(XmlPullParser.END_TAG, ns, "title");
        return title;
    }
    // Processes link tags in the feed.
    private String readLink(XmlPullParser parser) throws IOException, XmlPullParserException {
        parser.require(XmlPullParser.START_TAG, ns, "link");
        String link = readText(parser);
        parser.require(XmlPullParser.END_TAG, ns, "link");
        return link;
    }
    // Processes summary tags in the feed.
    private String readDescription(XmlPullParser parser) throws IOException, XmlPullParserException {
        parser.require(XmlPullParser.START_TAG, ns, "description");
        String summary = readText(parser);
        parser.require(XmlPullParser.END_TAG, ns, "description");
        return summary;
    }
    // For the tags title and summary, extracts their text values.
    private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
        String result = "";
        if (parser.next() == XmlPullParser.TEXT) {
            result = parser.getText();
            parser.nextTag();
        }
        return result;
    }
    // Skips tags the parser isn't interested in. Uses depth to handle nested tags. i.e.,
    // if the next tag after a START_TAG isn't a matching END_TAG, it keeps going until it
    // finds the matching END_TAG (as indicated by the value of "depth" being 0).
    private void skip(XmlPullParser parser) throws XmlPullParserException, IOException {
        if (parser.getEventType() != XmlPullParser.START_TAG) {
            throw new IllegalStateException();
        }
        int depth = 1;
        while (depth != 0) {
            switch (parser.next()) {
            case XmlPullParser.END_TAG:
                    depth--;
                    break;
            case XmlPullParser.START_TAG:
                    depth++;
                    break;
            }
        }
    }
}

，这里是我试图从中提取信息的提要:

http://feeds.folha.uol.com.br/poder/rss091.xml

Answer 1

解决了，我认为如果您正在使用XMLParser，您必须确保访问1.0或更高版本，当我使用Xml 2.0时，它像魅力一样工作。有人能证实吗?