Android之pull解析服务端的XML

本人在百度云存储的XMLhttp://bcs.duapp.com/meinvlook/books.xml

1、Android中XML三种解析方式三种方式:pull、dom和sax

pull在android 集成了这种解析，性能和sax差不多，个人认为用来来比sax解析容易多了；采用事件驱动进行解析。

dom(Document Object Model)文档对象模型：是W3C组织推荐的解析XML的一种方式;一般只能
只能解析比较小的XML文件；因为dom解析是把整个XML放入内存，占用内存比较大，但对文档的
增删改查标胶容易操作
sax(Simple API for XML)不是官方的标准，但它是XML社区事实上的标准，几乎所有的XML

解析器都支持它。sax解析一般适合xml的读取，sax解析是从上往下读取，一行一行来读；

实例代码:

package com.android.xiong.documentpullxml;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.LinkedHashMap;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import org.xmlpull.v1.XmlPullParserFactory;import android.app.Activity;import android.app.ProgressDialog;import android.content.DialogInterface;import android.os.AsyncTask;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {TextView showtxt;Button btshow;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);showtxt = (TextView) findViewById(R.id.showtxt);btshow = (Button) findViewById(R.id.showxml);btshow.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {GetBaiduXmlBooks  baiduxml=new GetBaiduXmlBooks();baiduxml.execute("http://bcs.duapp.com/meinvlook/books.xml");}});}// 异步任务class GetBaiduXmlBooks extendsAsyncTask<String, Integer, LinkedHashMap<String, String>> {ProgressDialog progress;// 初始化ProgressDialog@Overrideprotected void onPreExecute() {progress = new ProgressDialog(MainActivity.this);progress.setTitle("提示！");progress.setMessage("正在解析百度云存储的XML");progress.setCanceledOnTouchOutside(false);progress.setButton(ProgressDialog.BUTTON_NEUTRAL, "取消",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 取消任务GetBaiduXmlBooks.this.cancel(true);progress.dismiss();}});progress.show();}// 进行耗时操作@Overrideprotected LinkedHashMap<String, String> doInBackground(String... params) {String xmurl = params[0];LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();URL url;try {url = new URL(xmurl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setConnectTimeout(10000);connection.setRequestMethod("GET");InputStream instream = connection.getInputStream();// 获取xml解析器XmlPullParser parser = XmlPullParserFactory.newInstance().newPullParser();parser.setInput(instream, "UTF-8");int type=parser.getEventType();//开始解析xml文件while (type!= XmlPullParser.END_DOCUMENT) {if (type == XmlPullParser.START_TAG) {// 获取开始标签if (parser.getName().equals("书名")) {//获取节点的值map.put("书名", parser.nextText());}if (parser.getName().equals("价格")) {map.put("价格", parser.nextText());}if (parser.getName().equals("作者")) {map.put("作者", parser.nextText());}if (parser.getName().equals("性别")) {map.put("性别", parser.nextText());}if (parser.getName().equals("年龄")) {map.put("年龄",parser.nextText());}}type=parser.next();}} catch (IOException e) {e.printStackTrace();} catch (XmlPullParserException e) {e.printStackTrace();}return map;}@Overrideprotected void onPostExecute(LinkedHashMap<String, String> result) {for (String txt : result.keySet()) {showtxt.append(txt+":"+result.get(txt)+"\n");}progress.dismiss();}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity" >        <Button         android:id="@+id/showxml"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/btshowxml"/>    <TextView        android:id="@+id/showtxt"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

    <!-- 获取网络权限 -->    <uses-permission  android:name="android.permission.INTERNET"/>