java - 隔离 RSS 提要中的链接

Question

我是编程新手，所以请放轻松，我一直在摆弄一个简单的 RSS 阅读器，试图在用户单击文章时获取文章链接以在 Web View 中打开。

我找到了控制和存储链接的字符串，但是当我尝试在 toast 中打印链接时，链接出现了，但是带有整篇文章的发布日期等...我怎样才能获得链接以自行打印以及在隔离后我需要使用什么命令将链接传递给 webview，这是我的一些代码

RSSActivity

public class RssActivity extends ListActivity {
    private RssListAdapter adapter; 

        /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        List<JSONObject> jobs = new ArrayList<JSONObject>();
        try {
            jobs = RssReader.getLatestRssFeed();
        } catch (Exception e) {
            Log.e("RSS ERROR", "Error loading RSS Feed Stream >> " + e.getMessage() + " //" + e.toString());
        }

        adapter = new RssListAdapter(this,jobs);
        setListAdapter(adapter);
    }
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        // Get the item that was clicked
        Object o = this.getListAdapter().getItem(position);
        adapter.getItem(position).toString();
        String link = o.toString();


        Toast.makeText(this, "You selected: " + link, Toast.LENGTH_LONG)
                .show();


    }

}

文章类

    public class Article {

    private long articleId;
    private long feedId;
    private String title;
    private String description;
    private String pubDate;
    private URL url;
    private String encodedContent;
    private String link;


    public void setArticleId(long articleId) {
        this.articleId = articleId;
    }
    /**
     * @return the feedId
     */
    public long getFeedId() {
        return feedId;
    }
    /**
     * @param feedId the feedId to set
     */
    public void setFeedId(long feedId) {
        this.feedId = feedId;
    }
    public String getLink() {
        return link;
    }
    /**
     * @param title the title to set
     */
    public void setLink(String link) {
        this.link = link;
    }
    /**
     * @return the title
     */
    public String getTitle() {
        return title;
    }
    /**
     * @param title the title to set
     */
    public void setTitle(String title) {
        this.title = title;
    }
    /**
     * @return the url
     */
    public URL getUrl() {
        return url;
    }
    /**
     * @param url the url to set
     */
    public void setUrl(URL url) {
        this.url = url;
    }
    /**
     * @param description the description to set
     */
    public void setDescription(String description) {
        this.description = description;

        //parse description for any image or video links
        if (description.contains("<img ")){
            String img  = description.substring(description.indexOf("<img "));
            String cleanUp = img.substring(0, img.indexOf(">")+1);

            int indexOf = img.indexOf("'");
            if (indexOf==-1){

            }


            this.description = this.description.replace(cleanUp, "");
        }
    }
    /**
     * @return the description
     */
    public String getDescription() {
        return description;
    }
    /**
     * @param pubDate the pubDate to set
     */
    public void setPubDate(String pubDate) {
        this.pubDate = pubDate;
    }
    /**
     * @return the pubDate
     */
    public String getPubDate() {
        return pubDate;
    }
    /**
     * @param encodedContent the encodedContent to set
     */
    public void setEncodedContent(String encodedContent) {
        this.encodedContent = encodedContent;
    }
    /**
     * @return the encodedContent
     */
    public String getEncodedContent() {
        return encodedContent;
    }
}

RSS 处理程序

    public class RSSHandler extends DefaultHandler {

    // Feed and Article objects to use for temporary storage
    private Article currentArticle = new Article();
    private List<Article> articleList = new ArrayList<Article>();

    // Number of articles added so far
    private int articlesAdded = 0;

    // Number of articles to download
    private static final int ARTICLES_LIMIT = 15;

    //Current characters being accumulated
    StringBuffer chars = new StringBuffer();    

    public void startElement(String uri, String localName, String qName, Attributes atts) {
        chars = new StringBuffer();
    }

    public void endElement(String uri, String localName, String qName) throws SAXException {

        if (localName.equalsIgnoreCase("title"))
        {
            Log.d("LOGGING RSS XML", "Setting article title: " + chars.toString());
            currentArticle.setTitle(chars.toString());

        }
        else if (localName.equalsIgnoreCase("description"))
        {
            Log.d("LOGGING RSS XML", "Setting article description: " + chars.toString());
            currentArticle.setDescription(chars.toString());
        }
        else if (localName.equalsIgnoreCase("pubDate"))
        {
            Log.d("LOGGING RSS XML", "Setting article published date: " + chars.toString());
            currentArticle.setPubDate(chars.toString());
        }
        else if (localName.equalsIgnoreCase("encoded"))
        {
            Log.d("LOGGING RSS XML", "Setting article content: " + chars.toString());
            currentArticle.setEncodedContent(chars.toString());
        }
        else if (localName.equalsIgnoreCase("item"))
        {

        }
        else if (localName.equalsIgnoreCase("link"))
        {
            Log.d("LOGGING RSS XML", "Setting article link: " + chars.toString());
            currentArticle.setLink(chars.toString());
            try {
                Log.d("LOGGING RSS XML", "Setting article link url: " + chars.toString());
                currentArticle.setUrl(new URL(chars.toString()));
            } catch (MalformedURLException e) {
                Log.e("RSA Error", e.getMessage());
            }
        }

        // Check if looking for article, and if article is complete
        if (localName.equalsIgnoreCase("item")) {

            articleList.add(currentArticle);

            currentArticle = new Article();

            // Lets check if we've hit our limit on number of articles
            articlesAdded++;
            if (articlesAdded >= ARTICLES_LIMIT)
            {
                throw new SAXException();
            }
        }
    }

    public void characters(char ch[], int start, int length) {
        chars.append(new String(ch, start, length));
    }

    public List<Article> getLatestArticles(String feedUrl) {
        URL url = null;
        try {

            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();

            url = new URL(feedUrl);

            xr.setContentHandler(this);
            xr.parse(new InputSource(url.openStream()));


        } catch (IOException e) {
            Log.e("RSS Handler IO", e.getMessage() + " >> " + e.toString());
        } catch (SAXException e) {
            Log.e("RSS Handler SAX", e.toString());
        } catch (ParserConfigurationException e) {
            Log.e("RSS Handler Parser Config", e.toString());
        }

        return articleList;
    }

}

public class RssReader {

    private final static String BOLD_OPEN = "<B>";
    private final static String BOLD_CLOSE = "</B>";
    private final static String BREAK = "<BR>";
    private final static String ITALIC_OPEN = "<I>";
    private final static String ITALIC_CLOSE = "</I>";
    private final static String SMALL_OPEN = "<SMALL>";
    private final static String SMALL_CLOSE = "</SMALL>";
    private final static String WEB_LINK = "<A>";
    private final static String WEB_CLOSE = "<A/";

    public static List<JSONObject> getLatestRssFeed(){
        String feed = "http://newsrss.bbc.co.uk/rss/sportonline_uk_edition/football/eng_prem/rss.xml";

        RSSHandler rh = new RSSHandler();
        List<Article> articles =  rh.getLatestArticles(feed);
        Log.e("RSS ERROR", "Number of articles " + articles.size());
        return fillData(articles);
    }


    private static List<JSONObject> fillData(List<Article> articles) {

        List<JSONObject> items = new ArrayList<JSONObject>();
        for (Article article : articles) {
            JSONObject current = new JSONObject();
            try {
                buildJsonObject(article, current);
            } catch (JSONException e) {
                Log.e("RSS ERROR", "Error creating JSON Object from RSS feed");
            }
            items.add(current);
        }

        return items;
    }

    private static void buildJsonObject(Article article, JSONObject current) throws JSONException {
        String link = article.getLink();
        String title = article.getTitle();
        String description = article.getDescription();
        String date = article.getPubDate();


        StringBuffer sb = new StringBuffer();
        sb.append(BOLD_OPEN).append(title).append(BOLD_CLOSE);
        sb.append(BREAK);
        sb.append(description);
        sb.append(BREAK);
        sb.append(SMALL_OPEN).append(ITALIC_OPEN).append(date).append(ITALIC_CLOSE).append(SMALL_CLOSE);
        sb.append(BREAK);
        sb.append(BREAK);
        sb.append(BOLD_OPEN).append(WEB_LINK).append(link).append(BOLD_CLOSE).append(WEB_CLOSE);
        current.put("link", link);

        current.put("text", Html.fromHtml(sb.toString()));

    }
}

RssList适配器

import java.util.List;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.text.Spanned;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class RssListAdapter extends ArrayAdapter<JSONObject> {

    public RssListAdapter(Activity activity, List<JSONObject> imageAndTexts) {
        super(activity, 0, imageAndTexts);
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        Activity activity = (Activity) getContext();
        LayoutInflater inflater = activity.getLayoutInflater();

        // Inflate the views from XML
        View rowView = inflater.inflate(R.layout.image_text_layout, null);
        JSONObject jsonImageText = getItem(position);

        //////////////////////////////////////////////////////////////////////////////////////////////////////
        //The next section we update at runtime the text - as provided by the JSON from our REST call
        ////////////////////////////////////////////////////////////////////////////////////////////////////
        TextView textView = (TextView) rowView.findViewById(R.id.job_text);

        try {
            Spanned text = (Spanned)jsonImageText.get("text");
            textView.setText(text);

        } catch (JSONException e) {
            textView.setText("JSON Exception");
        }

        return rowView;

    } 

}

Answer 1

Open URL in default browser Open URL with Android

如果您在某一时刻有 URL 或 URI 对象，可能上面链接中的解释之一会帮助您。

-- 编辑:

protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    // Get the item that was clicked
    Object o = this.getListAdapter().getItem(position);
    adapter.getItem(position).toString();
    String link = o.toString();
    Toast.makeText(this, "You selected: " + link, Toast.LENGTH_LONG)
            .show();
}

我猜这是显示链接的代码，但如果您不向我们提供 getListAdapter() 方法等的作用，恐怕很难帮到您。