如何使用XmlPullParser从URL读取XML文件，AsyncTask Android
我跟着如何使用XmlPullParser从URL读取XML文件，AsyncTask Android,android,xml,android-asynctask,xmlpullparser,rss-reader,Android,Xml,Android Asynctask,Xmlpullparser,Rss Reader,我跟着 日志目录： 警告：org.xmlPull.v1.XmlPullParserException:应为：START_TAG{null}rss（位置：START_TAG@2:7 in java.io.InputStreamReader@41232f00） 错误：NullPoiterException 我正在寻找并使用一些基本的测试方法，但readRss方法中的parser.require不运行到rss标记 我想检索标题的内容，并将标签链接到项目中 我对我的英语能力感到抱歉，我对andro
日志目录：
警告：org.xmlPull.v1.XmlPullParserException:应为：START_TAG{null}rss（位置：START_TAG@2:7 in java.io.InputStreamReader@41232f00）
错误：NullPoiterException我想检索标题的内容，并将标签链接到项目中
我对我的英语能力感到抱歉，我对android编程还不熟悉
非常感谢 来自url的xml内容
<rss xmlns:slash="http://purl.org/rss/1.0/modules/slash/" version="2.0">
<channel>
<title></title>
<description></description>
<pubDate></pubDate>
<generator></generator>
<link></link>
<item>
<title>CONTENTS</title>
<link>http://test.html/</link>
</item>
</channel>
</rss>
目录
http://test.html/
public class XmlParser {
private static final String nameSpace = null;
public XmlParser(){
}
public List<Item> parse(InputStream inputStream)
throws XmlPullParserException, IOException {
try {
XmlPullParser parser = Xml.newPullParser();
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
parser.setInput(inputStream, null);
parser.nextTag();
return readRss(parser);
} finally {
inputStream.close();
}
}
private List<Item> readRss(XmlPullParser parser)
throws XmlPullParserException, IOException {
List<Item> itemList = new ArrayList<Item>();
int eventType = parser.getEventType();
System.out.println(parser.getName(); // <==== position is html
parser.require(XmlPullParser.START_TAG, nameSpace, "rss"); // <---- error
/** Code in here is failed**/
while (parser.next() != XmlPullParser.END_TAG) {
if (eventType!= XmlPullParser.START_TAG) {
continue;
}
String name = parser.getName();
// Starts by looking for the Rss tag
if (name.equals("item")) {
itemList.add(readItem(parser));
} else {
skip(parser);
}
}
return itemList;
}
// This class represents a single entry (post) in the XML feed.
// It includes the data members "title," "link," and "summary."
public static class Item{
String title = "";
String link = "";
private Item() {
}
private Item(String title){
this.title = title;
}
private Item(String title, String link) {
this.title = title;
this.link = link;
}
}
// Parses the contents of an item. If it encounters a title, link tag, hands
// them
// off
// to their respective "read" methods for processing. Otherwise,
// skips the tag.
private Item readItem(XmlPullParser parser) throws XmlPullParserException,
IOException {
parser.require(XmlPullParser.START_TAG, nameSpace, "item");
String title = null;
String link = null;
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("link")) {
link = readLink(parser);*/
}else{
skip(parser);
}
}
return new Item(title);
//return new Item(title, link);
}
// 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;
}
}
}
// Processes title tags in the Rss.
private String readTitle(XmlPullParser parser)
throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, nameSpace, "title");
String title = readTitle(parser);
parser.require(XmlPullParser.END_TAG, nameSpace, "title");
return title;
}
// Processes link tags in the Rss.
/*private String readLink(XmlPullParser parser)
throws XmlPullParserException, IOException {
parser.require(XmlPullParser.START_TAG, nameSpace, "link");
String link = readLink(parser);
parser.require(XmlPullParser.END_TAG, nameSpace, "link");
return link;
}
公共类XmlParser{
私有静态最终字符串名称空间=null；
公共XmlParser（）{
}
公共列表解析（InputStream InputStream）
引发XmlPullParserException，IOException{
试一试{
XmlPullParser=Xml.newPullParser（）；
setFeature（XmlPullParser.FEATURE_进程_名称空间，false）；
setInput（inputStream，null）；
parser.nextTag（）；
返回readRss（解析器）；
}最后{
inputStream.close（）；
}
}
私有列表阅读器（XmlPullParser）
引发XmlPullParserException，IOException{
List itemList=new ArrayList（）；
int eventType=parser.getEventType（）；
System.out.println（parser.getName（）；//您的Http请求并没有像您预期的那样返回rss，而是返回一个HTML页面，这就是您的解析失败的原因
归还的东西的剪报
<!DOCTYPE html>
<html><!-- InstanceBegin template="/Templates/common.dwt" codeOutsideHTMLIsLocked="false" -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-title" content="Vnexpress.net" />
<!-- iPad icons -->
<link rel="apple-touch-icon-precomposed" href="http://st.f1.vnecdn.net/responsive/images/logos/72x72.png" sizes="72x72">
<link rel="apple-touch-icon-precomposed" href="http://st.f1.vnecdn.net/responsive/images/logos/114x114.png" sizes="144x144">
<!-- iPhone and iPod touch icons -->
<link rel="apple-touch-icon-precomposed" href="http://st.f1.vnecdn.net/responsive/images/logos/57x57.png" sizes="57x57">
<link rel="apple-touch-icon-precomposed" href="http://st.f1.vnecdn.net/responsive/images/logos/114x114.png" sizes="114x114">
<!-- Nokia Symbian -->
<link rel="nokia-touch-icon" href="http://st.f1.vnecdn.net/responsive/images/logos/57x57.png">
<!-- Android icon precomposed so it takes precedence -->
<link rel="apple-touch-icon-precomposed" href="http://st.f1.vnecdn.net/responsive/images/logos/114x114.png" sizes="1x1">
<!-- InstanceBeginEditable name="doctitle" -->
<title>Tin nhanh VnExpress - Äá»c báo, tin tức online 24h</title>
<!-- InstanceEndEditable -->
<link rel="stylesheet" href="http://st.f3.vnecdn.net/responsive/c/v2/general.css" media="all" />
<!-- link rel="stylesheet" href="http://st.f3.vnecdn.net/responsive/css/iphone.css" media="all" / -->
<!-- InstanceBeginEditable name="css" -->
<!-- InstanceEndEditable -->
<script src="http://st.f4.vnecdn.net/responsive/libs/jquery-1.7.1.min.js"></script>
<script language="javascript" type="text/javascript">
var interactions_url = 'http://interactions.vnexpress.net';
var base_url = 'http://vnexpress.net';
var css_url = 'http://st.f3.vnecdn.net/responsive/c/v2';
var js_url = 'http://st.f2.vnecdn.net/responsive/j/v2';
var flash_url = 'http://st.f4.vnecdn.net/responsive/f/v2';
var img_url = 'http://st.f1.vnecdn.net/responsive/i/v2';
var image_cloud = 'http://l.f29.img.vnecdn.net';
var PageHot = 0;
var device_env = 2;
var site_id = 1000000;
var SITE_ID = 1000000;
var PAGE_FOLDER = 1001005;
var PAGE_DETAIL = 0 //setTypingMode(1);
</script>
<script src="http://st.polyad.net/library/2014/VneShowAds.js"></script>
<script src="http://st.polyad.net/library/2014/vneads.js"></script>
<script type="text/javascript" src="http://st.f2.vnecdn.net/responsive/j/v2/utils/utils.js"></script>
<script type="text/javascript" src="http://st.f2.vnecdn.net/responsive/j/v2/utils/crawler.js"></script>
<script type="text/javascript" src="http://st.f2.vnecdn.net/responsive/j/v2/interactions/parser_v2.js"></script>
<script language="javascript" type="text/javascript">
var PageHot = 0;
var site_id = 1000000;
var PAGE_FOLDER = 1001005;
</script>
<!-- InstanceBeginEditable name="javascript" -->
<!-- InstanceEndEditable -->
<!-- TRACKING GOOGLE -->
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
//beta vnexpress reponsive
ga('create', 'UA-249346-69', 'vnexpress.net');
ga('send', 'pageview');
//new tracker
ga('create', 'UA-249346-21', 'auto', {'name': 'newTracker'});
ga('newTracker.send', 'pageview');
//new tracker 1
ga('create', 'UA-249346-22', 'auto', {'name': 'newTracker1'});
ga('newTracker1.send', 'pageview');
</script>
<script type="text/javascript">
/*
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-249346-21']);
_gaq.push(['_trackPageview']);
_gaq.push(['b._setAccount', 'UA-249346-22']);
_gaq.push(['b._trackPageview']);
_gaq.push(['c._setAccount', 'UA-249346-1']);
_gaq.push(['c._trackPageview']);
<?php echo $this->ShowGaByCate($parent_category_id);?>
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
*/
</script>
<script>
if(PAGE_FOLDER==1000000)
{
var _siteId="6";
/// track cu trang chu//
(function(){
var e=document.createElement("script");e.type="text/javascript",e.async=!0,e.src="http://st.l.a.eclick.vn/ea.js";
var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t)})();
}else
{
var _siteId = "5";
// track cu trang con //
(function(){
var e=document.createElement("script");e.type="text/javascript",e.async=!0,e.src="http://st.l.a.eclick.vn/ea.js";
var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t)})();
}
</script>
<!-- END TRACKING GOOGLE -->
</head>
<body>
<div class="block_more_info" id="box_col_left" style="left: -240px;">
<div class="box_width_common">
<div class="btn_control_col_left"><img alt="" src="http://st.f1.vnecdn.net/responsive/i/v2/graphics/img_left_panel.gif"></div>
<div class="block_scoll_menu">
<div class="block_search">
<form id="search" target="_blank" method="get"
....
因此，我进一步调查发现，httpserver
可能基于用户代理来限制访问，下面的一行似乎可以解决这个问题
conn.setRequestProperty("User-Agent", "Fiddler");
修复了这个问题，我相信这是一个很好的起点，可以帮助您继续并修复解析错误
结束编辑
GET /rss/du-lich.rss HTTP/1.1
Content-Type: application/rss+xml
User-Agent: Dalvik/2.0.0 (Linux; U; Android L Build/LPV81B)
Host: vnexpress.net
Connection: Keep-Alive
Accept-Encoding: gzip
HTTP/1.1 302 Moved Temporarily
Server: Fengine/1.5.2
Date: Fri, 10 Oct 2014 09:20:56 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Set-Cookie: device_env=1; expires=Fri, 17-Oct-2014 09:20:55 GMT; path=/; domain=vnexpress.net
Location: /error4.html
Content-Encoding: gzip
Vary: Accept-Encoding
server: web_141.173
conn.setRequestProperty("User-Agent", "Fiddler");