2011-02-02 137 views
0

我正在嘗試閱讀雅虎天氣rss並在我的android應用程序中顯示它們。如何讀取rss描述標籤內的img標籤

在rss的<描述> </description>標記的旁邊有一個img src =「圖像的url」標記。

但我不知道如何閱讀該網址。有人可以在這方面幫助我嗎?

這裏是我的代碼:

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>"; 

public static List<JSONObject> getLatestRssFeed(){ 
    String feed ="http://weather.yahooapis.com/forecastrss?w=554890&u=c"; 

    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 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); 

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

所以這裏img標籤是說明標籤內。我怎麼讀?任何幫助?

這裏是RSSHandler:

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(); 


/* 
* This method is called everytime a start element is found (an opening XML marker) 
* here we always reset the characters StringBuffer as we are only currently interested 
* in the the text values stored at leaf nodes 
* 
* (non-Javadoc) 
* @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes) 
*/ 
public void startElement(String uri, String localName, String qName, Attributes atts) { 
    chars = new StringBuffer(); 
} 



/* 
* This method is called everytime an end element is found (a closing XML marker) 
* here we check what element is being closed, if it is a relevant leaf node that we are 
* checking, such as Title, then we get the characters we have accumulated in the StringBuffer 
* and set the current Article's title to the value 
* 
* If this is closing the "Item", it means it is the end of the article, so we add that to the list 
* and then reset our Article object for the next one on the stream 
* 
* 
* (non-Javadoc) 
* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String) 
*/ 
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")) 
    { 
     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(); 
     } 
    } 
} 





/* 
* This method is called when characters are found in between XML markers, however, there is no 
* guarante that this will be called at the end of the node, or that it will be called only once 
* , so we just accumulate these and then deal with them in endElement() to be sure we have all the 
* text 
* 
* (non-Javadoc) 
* @see org.xml.sax.helpers.DefaultHandler#characters(char[], int, int) 
*/ 
public void characters(char ch[], int start, int length) { 
    chars.append(new String(ch, start, length)); 
} 





/** 
* This is the entry point to the parser and creates the feed to be parsed 
* 
* @param feedUrl 
* @return 
*/ 
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; 
} 
+0

我們需要一些更多的細節,是什麼格式?你如何解析它? – 2011-02-02 22:25:00

回答

0

我瘦,你會過得更好使用YQL和JSON,而不是RSS。無論如何,如果你使用RSS你需要解析XML。 SAX解析器是建立在Android的自身

1

你應該使用的WebView從descripion顯示信息:

loadData(String data, String mimeType, String encoding) 

加載給定的數據到的WebView。

  • 你自定義的數據HTML