XML 专题之一 xml解析 + Listview

来源：互联网发布：mysql函数编辑：程序博客网时间：2024/05/22 09:49

写写，码码码
先说xml解析：
安卓中常用的xml解析包括pull解析在Android studio上开发不需要导入jar包）和Sax解析
由于没有服务器，我就把xml文件放到本地进行演示了。
首先，在res目录下新建 xml目录，把准备好的xml文件内容放进去。然后开始解析工作。

<?xml version="1.0" encoding="UTF-8"?><students>    <student id="1001" group="1">        <name>张三</name>        <sex>男</sex>        <age>30</age>        <email>zhangsan@163.com</email>        <birthday>1900-09-09</birthday>        <memo>组长</memo>    </student>    <student id="1002" group="1">        <name>lisi</name>        <sex>女</sex>        <age>23</age>        <email>lisi@163.com</email>        <birthday>2000-09-09</birthday>        <memo>组员</memo>    </student>    <student id="1003" group="1">        <name>wangwu</name>        <sex>男</sex>        <age>30</age>        <email>wangwu@163.com</email>        <birthday>1990-09-09</birthday>        <memo>组员</memo>    </student>    <student id="1004" group="2">        <name>Jack</name>        <sex>男</sex>        <age>30</age>        <email>jack@163.com</email>        <birthday>2001-09-09</birthday>        <memo>组长</memo>    </student>    <student id="1005" group="2">        <name>Rose</name>        <sex>女</sex>        <age>23</age>        <email>rose@163.com</email>        <birthday>2003-09-09</birthday>        <memo>组员</memo>    </student>    <student id="1006" group="3">        <name>Tom</name>        <sex>男</sex>        <age>30</age>        <email>tom@163.com</email>        <birthday>2008-09-09</birthday>        <memo>组长</memo>    </student></students>

PULL解析：
PULL：基于事件常量的方式。
—》常量数值：int：0,1,2,3,4
开始解析文档事件：XmlPullParser.START_DOCUMENT—>0
结束解析文档事件：XmlPullParse.END_DOCUMENT—>1
开始解析标签事件：XmlPullParse.START_TAG—>2
结束解析标签事件：XmlPullParse.END_TAG—>3
解析文本事件：XmlPullParse.TEXT—>4

操作步骤：
step1：导包kxml.jar
观察文档，创建javabean。
step2：创建工厂—>创建解析器对象parser
step3：设置要解析的文件
parser.setInput()
step4：解析
A：获取首次的解析事件类型：0，开始文档
B：循环解析
a）循环条件：解析事件不为1，结束文档
b）获取标签名
c）分支—》根据不同的事件类型，处理
d）获取下次事件类型：next()
C：遍历集合

pull–>事件—>常量
实例代码：

package com.cc.day0710_wang_05;import android.content.res.XmlResourceParser;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.ListView;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import java.io.IOException;import java.util.ArrayList;import java.util.List;class Student{    private int id;    private String name;    private char sex;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public char getSex() {        return sex;    }    public void setSex(char sex) {        this.sex = sex;    }}public class MainActivity extends AppCompatActivity {    private ListView mListView;    private List<Student> mList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mListView = (ListView) findViewById(R.id.list_view);        mList = parseXmlUsingPull();        MyBaseAdapter adapter = new MyBaseAdapter(this,mList);        mListView.setAdapter(adapter);    }    public List<Student> parseXmlUsingPull(){        List<Student> list = null;        Student student = null;        XmlResourceParser parser = getResources().getXml(R.xml.student);        try {            int eventType = parser.getEventType();            while (eventType != XmlPullParser.END_DOCUMENT){                String name = parser.getName();                switch (eventType){                    case XmlPullParser.START_TAG:                        if ("students".equals(name)){                            list = new ArrayList<>();                        }else if("student".equals(name)){                            student = new Student();                            student.setId(Integer.parseInt(parser.getAttributeValue(0)));                        }else if ("name".equals(name)){                            student.setName(parser.nextText());                        }else if ("sex".equals(name)){                            student.setSex(parser.nextText().charAt(0));                        }                        break;                    case XmlPullParser.END_TAG:                        if ("student".equals(name)){                            list.add(student);                        }                        break;                }                eventType = parser.next();            }        } catch (XmlPullParserException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return list;    }}

自定义适配器

package com.cc.day0710_wang_05;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import java.util.List;/** * Created by My on 2016/7/10. */public class MyBaseAdapter  extends BaseAdapter{    private Context mContext;    private List<Student> mList;    public MyBaseAdapter(Context context, List<Student> list) {        mContext = context;        mList = list;    }    @Override    public int getCount() {        return mList.size();    }    @Override    public Object getItem(int position) {        return mList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder = null;        if (convertView == null){            viewHolder = new ViewHolder();            convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item,null);            viewHolder.tv1 = (TextView) convertView.findViewById(R.id.tv1);            viewHolder.tv2 = (TextView) convertView.findViewById(R.id.tv2);            viewHolder.tv3 = (TextView) convertView.findViewById(R.id.tv3);            convertView.setTag(viewHolder);        }else {            viewHolder = (ViewHolder) convertView.getTag();        }        viewHolder.tv1.setText(mList.get(position).getId() + "");        viewHolder.tv2.setText(mList.get(position).getName());        viewHolder.tv3.setText(mList.get(position).getSex() + "");        return convertView;    }    public final class ViewHolder{        TextView tv1,tv2,tv3;    }}

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