解析XML Android的 - <描述>标签解析 [英] Parsing XML Android - <description> tag parsing

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问题描述

即时通讯试图建立一个应用程序来阅读提要:的http://禄。 grupolusofona.pt/index.php/?format=feed

它的工作就好了,除了当它到达的元素,它只是跳过它,让事实为空白。

继承人我得到了什么:

 公共类AndroidXMLParsingActivity扩展ListActivity {

//所有静态变量
静态最终字符串URL =htt​​p://loc.grupolusofona.pt/index.php/?format=feed;
// XML节点键
静态最后弦乐KEY_ITEM =项目; //父节点
静态最后弦乐KEY_ID =ID;
静态最后弦乐KEY_TITLE =称号;
静态最后弦乐KEY_DESC =说明;
静态最后弦乐KEY_LINK =链接;
静态最后弦乐KEY_PUBDATE =pubdate的;

@覆盖
公共无效的onCreate(包savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.main);

    ArrayList的< HashMap的<字符串,字符串>>菜单项=新的ArrayList< HashMap的<字符串,字符串>>();

    XMLParser的分析器=新XMLParser的();
    XML字符串= parser.getXmlFromUrl(URL); //获取XML
    文档DOC = parser.getDomElement(XML); //获取DOM元素

    NodeList的NL = doc.getElementsByTagName(KEY_ITEM);
    //遍历所有的项目节点<项目>
    的for(int i = 0; I< nl.getLength();我++){
        //创建新的HashMap
        HashMap的<字符串,字符串>图=新的HashMap<字符串,字符串>();
        元素e =(元)nl.item(我);
        //添加每个子节点HashMap中的key =>值
        map.put(KEY_ID,parser.getValue(即KEY_ID));
        map.put(KEY_TITLE,parser.getValue(即KEY_TITLE));
        map.put(KEY_DESC,parser.getValue(即KEY_DESC));
        map.put(KEY_LINK,parser.getValue(即KEY_LINK));
        map.put(KEY_PUBDATE,parser.getValue(即KEY_PUBDATE));

        //添加HashList到ArrayList中
        menuItems.add(图)
    }

    //添加菜单项到ListView控件
    ListAdapter适配器=新SimpleAdapter(这一点,菜单项,
            R.layout.list_item,
            新的String [] {KEY_TITLE,KEY_DESC,KEY_PUBDATE,KEY_LINK},新的INT [] {
                    R.id.title,R.id.desc,R.id.pub,R.id.link});

    setListAdapter(适配器);

    //选择单一的ListView项
    ListView的LV = getListView();

    lv.setOnItemClickListener(新OnItemClickListener(){

        @覆盖
        公共无效onItemClick(适配器视图<>母公司视图中查看,
                INT位置,长的id){
            //从选择列表项获得价值

            字符串标题=((TextView中)view.findViewById(R.id.title))的getText()的toString()。
            字符串描述=((TextView中)view.findViewById(R.id.desc))的getText()的toString()。
            字符串link =((TextView中)view.findViewById(R.id.link))的getText()的toString()。

            //开始的新意图

            的System.out.println(标题:+称号);
            的System.out.println(链接:+链接);
            的System.out.println(描述:+说明);
            意图=新的意图(Intent.ACTION_VIEW);
            in.setData(Uri.parse(链接));

            startActivity(在);

        }
    });
}
}
 

而XMLParser的:

 公共XMLParser类{

//构造
公共XMLParser的(){

}

/ **
 *从URL获取XML使得HTTP请求
 * @参数的URL字符串
 * * /
公共字符串getXmlFromUrl(字符串URL){
    XML字符串= NULL;

    尝试 {
        // defaultHttpClient
        DefaultHttpClient的HttpClient =新DefaultHttpClient();
        HttpPost httpPost =新HttpPost(URL);

        HTT presponse HTT presponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = HTT presponse.getEntity();
        XML = EntityUtils.toString(httpEntity);

    }赶上(UnsupportedEncodingException E){
        e.printStackTrace();
    }赶上(ClientProtocolException E){
        e.printStackTrace();
    }赶上(IOException异常E){
        e.printStackTrace();
    }
    //返回XML
    返回XML;
}

/ **
 *获取XML DOM元素
 * @参数XML字符串
 * * /
公开文件getDomElement(XML字符串){
    文档DOC = NULL;
    DocumentBuilderFactory的DBF = DocumentBuilderFactory.newInstance();
    尝试 {

        DocumentBuilder的DB = dbf.newDocumentBuilder();

        InputSource的是=新的InputSource();
            is.setCharacterStream(新StringReader(XML));
            DOC = db.parse(是);

        }赶上(的ParserConfigurationException E){
            Log.e(错误,e.getMessage());
            返回null;
        }赶上(的SAXException E){
            Log.e(错误,e.getMessage());
            返回null;
        }赶上(IOException异常E){
            Log.e(错误,e.getMessage());
            返回null;
        }

        返回文档;
}

/ **获取节点值
  * @参数ELEM元素
  * /
 公共最后弦乐getElementValue(节点ELEM){
     子节点;
     如果(ELEM!= NULL){
         如果(elem.hasChildNodes()){
             对于(子= elem.getFirstChild();!孩子= NULL;孩子= child.getNextSibling()){
                 如果(child.getNodeType()== Node.TEXT_NODE){
                     返回child.getNodeValue();
                 }
             }
         }
     }
     返回 ;
 }

 / **
  *获取节点值
  * @参数元素节点
  * @参数密钥字符串
  * * /
 公共字符串的getValue(元素项,字符串str){
        节点列表N = item.getElementsByTagName(STR);
        返回this.getElementValue(n.item(0));
    }
 

}

任何想法,我做错了什么?

感谢

解决方案

 公共最后弦乐getElementValue(节点ELEM){
 子节点;
 如果(ELEM!= NULL){
     如果(elem.hasChildNodes()){
         对于(子= elem.getFirstChild();!孩子= NULL;孩子= child.getNextSibling()){
             如果(child.getNodeType()== Node.TEXT_NODE){
                 返回child.getNodeValue();
             }
         }
     }
 }
 返回 ;
}
 

您使用此code这给空在解析说明。

我试试你的code和得到说明的内容。

我用

  child.getTextContent()
 

和它给我的内容。

更改code到

 公共最后弦乐getElementValue(节点ELEM){
 子节点;
 如果(ELEM!= NULL){
 如果(elem.hasChildNodes()){
     对于(子= elem.getFirstChild();!孩子= NULL;孩子= child.getNextSibling()){
         如果(child.getNodeName()。equalsIgnoreCase(说明))
         {
             返回child.getTextContent();
         }
         如果(child.getNodeType()== Node.TEXT_NODE){
             返回child.getNodeValue();
         }
     }
 }
 }
 返回 ;
}
 

和你有说明书的内容以及..,。 试试吧..,。

im trying to build an app to read this feed: http://loc.grupolusofona.pt/index.php/?format=feed

Its working just fine, except for the fact that when it reaches the element, it just skips it, leaving it blank.

Heres what i got:

public class AndroidXMLParsingActivity extends ListActivity {

// All static variables
static final String URL = "http://loc.grupolusofona.pt/index.php/?format=feed";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_DESC = "description";
static final String KEY_LINK = "link";
static final String KEY_PUBDATE = "pubDate";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

    XMLParser parser = new XMLParser();
    String xml = parser.getXmlFromUrl(URL); // getting XML
    Document doc = parser.getDomElement(xml); // getting DOM element

    NodeList nl = doc.getElementsByTagName(KEY_ITEM);
    // looping through all item nodes <item>
    for (int i = 0; i < nl.getLength(); i++) {
        // creating new HashMap
        HashMap<String, String> map = new HashMap<String, String>();
        Element e = (Element) nl.item(i);
        // adding each child node to HashMap key => value
        map.put(KEY_ID, parser.getValue(e, KEY_ID));
        map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
        map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
        map.put(KEY_LINK, parser.getValue(e, KEY_LINK));
        map.put(KEY_PUBDATE, parser.getValue(e, KEY_PUBDATE));

        // adding HashList to ArrayList
        menuItems.add(map);
    }

    // Adding menuItems to ListView
    ListAdapter adapter = new SimpleAdapter(this, menuItems,
            R.layout.list_item,
            new String[] { KEY_TITLE, KEY_DESC, KEY_PUBDATE, KEY_LINK }, new int[] {
                    R.id.title, R.id.desc, R.id.pub, R.id.link});

    setListAdapter(adapter);

    // selecting single ListView item
    ListView lv = getListView();

    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // getting values from selected ListItem

            String title = ((TextView) view.findViewById(R.id.title)).getText().toString();
            String description = ((TextView) view.findViewById(R.id.desc)).getText().toString();
            String link = ((TextView) view.findViewById(R.id.link)).getText().toString();

            // Starting new intent

            System.out.println("Title: " + title);
            System.out.println("Link: " + link);
            System.out.println("Description:" + description);
            Intent in = new Intent(Intent.ACTION_VIEW);
            in.setData(Uri.parse(link));

            startActivity(in);

        }
    });
}
}

And the XMLParser:

public class XMLParser {

// constructor
public XMLParser() {

}

/**
 * Getting XML from URL making HTTP request
 * @param url string
 * */
public String getXmlFromUrl(String url) {
    String xml = null;

    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        xml = EntityUtils.toString(httpEntity);

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // return XML
    return xml;
}

/**
 * Getting XML DOM element
 * @param XML string
 * */
public Document getDomElement(String xml){
    Document doc = null;
    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    try {

        DocumentBuilder db = dbf.newDocumentBuilder();

        InputSource is = new InputSource();
            is.setCharacterStream(new StringReader(xml));
            doc = db.parse(is); 

        } catch (ParserConfigurationException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        } catch (SAXException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        } catch (IOException e) {
            Log.e("Error: ", e.getMessage());
            return null;
        }

        return doc;
}

/** Getting node value
  * @param elem element
  */
 public final String getElementValue( Node elem ) {
     Node child;
     if( elem != null){
         if (elem.hasChildNodes()){
             for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
                 if( child.getNodeType() == Node.TEXT_NODE  ){
                     return child.getNodeValue();
                 }
             }
         }
     }
     return "";
 }

 /**
  * Getting node value
  * @param Element node
  * @param key string
  * */
 public String getValue(Element item, String str) {     
        NodeList n = item.getElementsByTagName(str);        
        return this.getElementValue(n.item(0));
    }

}

Any ideas for what i am doing wrong ?

Thanks

解决方案

public final String getElementValue( Node elem ) {
 Node child;
 if( elem != null){
     if (elem.hasChildNodes()){
         for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
             if( child.getNodeType() == Node.TEXT_NODE  ){
                 return child.getNodeValue();
             }
         }
     }
 }
 return "";
}

you are using this code which give null while parsing description.

I try your code and to get the content of description.

I use

child.getTextContent()

and it give me the content.

Change your code to

public final String getElementValue( Node elem ) {
 Node child;
 if( elem != null){
 if (elem.hasChildNodes()){
     for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
         if(child.getNodeName().equalsIgnoreCase("description"))
         {
             return child.getTextContent();
         }
         if( child.getNodeType() == Node.TEXT_NODE  ){
             return child.getNodeValue();
         }
     }
 }
 }
 return "";
}

And you got the content of description as well..,. Try it..,.

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