解析XML Android的 - &LT;描述&GT;标签解析 [英] Parsing XML Android - <description> tag parsing
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 =http://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&LT; HashMap的&LT;字符串,字符串&GT;&GT;菜单项=新的ArrayList&LT; HashMap的&LT;字符串,字符串&GT;&GT;();
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&LT;项目&GT;
的for(int i = 0; I&LT; nl.getLength();我++){
//创建新的HashMap
HashMap的&LT;字符串,字符串&GT;图=新的HashMap&LT;字符串,字符串&GT;();
元素e =(元)nl.item(我);
//添加每个子节点HashMap中的key =&GT;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&LT;&GT;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
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
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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