安卓使用XML解析数据并展示到ListView中

来源：互联网发布：handwrite pro软件编辑：程序博客网时间：2024/05/21 04:38

先上效果图：
这里写图片描述

好久不碰XML解析，在此写了个小的demo来温习一下解析XML，其中我用的Pull来解析XML，XML文件存放在tomcat服务器，服务器端采用SSH框架编码完成，由安卓端通过http的GET请求获取到xml，之后就是解析啦，解析完将所有数据存放在实体类中，接下来就是将数据显示在ListView上面了。demo虽小，但其中遇到一些问题卡住我半天，下面就来看看吧。服务器的搭建比较简单了，其中在action中处理安卓端的get请求，将person.xml以字节流的方式返回给安卓端.

action中代码：

//获取xml数据    public String getXmlData(){        try {            request.setCharacterEncoding("UTF-8");            response.setContentType("text/html;charset:UTF-8");            response.setCharacterEncoding("UTF-8");            List<Person> persons=personBiz.getXmlData();            /*for (Person person : persons) {                System.out.println(person);            }*/            request.setAttribute("persons", persons);        } catch (UnsupportedEncodingException e) {            e.printStackTrace();        }        return "success";    }

dao层接口代码：

//查询所有xml数据    public List<Person> getXmlData();

dao层实现类代码：

@Override    public List<Person> getXmlData() {        List<Person> lists=getSession().createQuery("from Person").list();        return lists;    }

struts.xml中配置action:

<action name="getXmlData" class="personAction" method="getXmlData">                <result name="success">/list.jsp</result>            </action>

服务器端页面请求:

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><center>    <a href="getXmlData.action">解析XML数据</a></center></body></html>

服务器端页面返回结果：

<?xml version="1.0" encoding="UTF-8" ?><%@ page language="java" contentType="text/xml; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><persons><c:forEach var="p" items="${persons}">        <person pid="${p.pid}">            <pname>${p.pname}</pname>            <page>${p.page}</page>        </person>    </c:forEach></persons>

服务器端运行结果：
这里写图片描述

安卓端http的GET请求获取到xml，并解析，将数据存放到实体类中：

package com.example.android_parsexml;import android.app.ProgressDialog;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.util.Xml;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ListView lv_main_list;    private List<Person> personList = new ArrayList<Person>();    private ProgressDialog progressDialog;    private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取listview        lv_main_list = (ListView) findViewById(R.id.lv_main_list);        //实例化进度条对话框        progressDialog = new ProgressDialog(this);        progressDialog.setMessage("亲，正在玩命加载中哦！");        //实例化适配器        myAdapter = new MyAdapter();        //设置适配器        lv_main_list.setAdapter(myAdapter);    }    //自己写个适配器类    class MyAdapter extends BaseAdapter{        @Override        public int getCount() {            return personList.size();        }        @Override        public Object getItem(int i) {            return personList.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            LinearLayout layout=new LinearLayout(MainActivity.this);            layout.setOrientation(LinearLayout.HORIZONTAL);            TextView textViewPid=new TextView(MainActivity.this);            textViewPid.setText(personList.get(i).getPid() +"\t\t\t\t"+"");            TextView textViewPname=new TextView(MainActivity.this);            textViewPname.setText(personList.get(i).getPname()+"\t\t\t\t");            TextView textViewPage=new TextView(MainActivity.this);            textViewPage.setText(personList.get(i).getPage() +"\t\t\t\t"+ "");            layout.addView(textViewPid);            layout.addView(textViewPname);            layout.addView(textViewPage);            return layout;        }    }    //获取xml数据    public void getXML(View view) {        new MyTask().execute();    }    //通过异步任务类获取数据    class MyTask extends AsyncTask {        private Person person;        //准备执行        @Override        protected void onPreExecute() {            super.onPreExecute();            progressDialog.show();        }        @Override        protected Object doInBackground(Object[] params) {            //获取网络路径            String path = "http://192.168.43.170:8080/S2SH/getXmlData.action";            //实例化URL            try {                URL url = new URL(path);                //获取连接对象                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();                //设置请求方式                httpURLConnection.setRequestMethod("GET");                //设置连接超时                httpURLConnection.setConnectTimeout(5000);                //获取响应码                int code = httpURLConnection.getResponseCode();                if (code == 200) {                    //响应成功,获取服务器返回过来的数据                    InputStream is = httpURLConnection.getInputStream();                    //解析PULL SAX  基于事件驱动                    XmlPullParser xpp=Xml.newPullParser();                    try {                        xpp.setInput(is,"UTF-8");                        int type=xpp.getEventType();                        while(type!=XmlPullParser.END_DOCUMENT){                            switch (type) {                                case XmlPullParser.START_TAG:                                    //获取开始标签的名字                                    String startTagName=xpp.getName();                                    if("person".equals(startTagName)){                                        person = new Person();                                        //获取name属性值                                        String pid=xpp.getAttributeValue(0);                                        person.setPid(Integer.parseInt(pid));                                    }else if("pname".equals(startTagName)){                                        //获取sex的文本值                                        String pname=xpp.nextText();                                        person.setPname(pname);                                    }else if("page".equals(startTagName)){                                        //获取sex的文本值                                        String page=xpp.nextText();                                        person.setPage(Integer.parseInt(page));                                    }                                    break;                                case XmlPullParser.END_TAG:                                    //获取到结束标签的名字                                    String endTagName=xpp.getName();                                    if("person".equals(endTagName)){                                        personList.add(person);                                    }                                    break;                            }                            type=xpp.next();                        }                    } catch (XmlPullParserException e) {                        e.printStackTrace();                    }                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return personList;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            //通知适配器发生改变            myAdapter.notifyDataSetChanged();            //取消进度条对话框            progressDialog.cancel();        }    }}

layout.xml代码：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.android_parsexml.MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="获取XML数据"        android:onClick="getXML"        />    <ListView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="40dp"        android:id="@+id/lv_main_list"        ></ListView></RelativeLayout>

实体类代码：

package com.example.android_parsexml;public class Person {    private int pid;    private String pname;    private int page;    public int getPid() {        return pid;    }    public void setPid(int pid) {        this.pid = pid;    }    public String getPname() {        return pname;    }    public void setPname(String pname) {        this.pname = pname;    }    public int getPage() {        return page;    }    public void setPage(int page) {        this.page = page;    }    public Person() {        super();    }    public Person(String pname, int page) {        super();        this.pname = pname;        this.page = page;    }    @Override    public String toString() {        return "Person [pid=" + pid + ", pname=" + pname + ", page=" + page + "]";    }}

mainfests 添加权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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