xml文件的序列化示例

1、创建activity_main.xml

<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"    tools:context=".MainActivity" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="99dp"        android:onClick="bck"        android:text="@string/bcak" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/button1"        android:layout_centerVertical="true"        android:onClick="pck"        android:text="@string/back2" /></RelativeLayout>

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2、编写MainActivity类

package com.hyzhou.xmldemo;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Random;import org.xmlpull.v1.XmlSerializer;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.util.Log;import android.util.Xml;import android.view.Menu;import android.view.View;import android.widget.Toast;public class MainActivity extends Activity {    private List<SMSInfo> smsinfo;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        smsinfo=new ArrayList<SMSInfo>();        Random    random=new Random();        long number=1571132;        for (int i = 0; i < 10; i++) {            smsinfo.add(new SMSInfo(System.currentTimeMillis(), random.nextInt()+1, "短信内容"+i, Long.toString(number+i),i));        }            }    //第一种实现方式    public void  bck(View view) {        StringBuilder sb=new StringBuilder();        sb.append("<smss>");        for (SMSInfo info : smsinfo) {            sb.append("<sms>");            sb.append("<address>");            sb.append(info.getAddress());            sb.append("</address>");                        sb.append("<type>");            sb.append(info.getType());            sb.append("</type>");                        sb.append("<body>");            sb.append(info.getBody());            sb.append("</body>");                        sb.append("<date>");            sb.append(info.getBody());            sb.append("</date>");                        sb.append("</sms>");                                }        sb.append("</smss>");                try {            File file=new File(Environment.getExternalStorageDirectory(),"back.xml");            FileOutputStream fos=new FileOutputStream(file);            fos.write(sb.toString().getBytes());            fos.close();            Toast.makeText(this, "备份成功", Toast.LENGTH_SHORT).show();        }  catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();            Toast.makeText(this, "备份失败", Toast.LENGTH_SHORT).show();                    }    }    //第二种实现方式，推荐使用第二种方式    public void  pck(View view) {        try {            XmlSerializer serializer=Xml.newSerializer();            File file=new File(Environment.getExternalStorageDirectory(),"back2.xml");            FileOutputStream os = new FileOutputStream(file);            //初始化序列号器指定xml数据写到哪个文件，并且指定文件的编码方式            serializer.setOutput(os, "utf-8");            serializer.startDocument("utf-8", true);            serializer.startTag(null, "smss");                        for (SMSInfo info : smsinfo) {                serializer.startTag(null, "sms");                serializer.attribute(null, "id", info.getId()+"");                                serializer.startTag(null, "body");                serializer.text(info.getBody());                serializer.endTag(null, "body");                                serializer.startTag(null, "address");                serializer.text(info.getAddress());                serializer.endTag(null, "address");                                serializer.startTag(null, "type");                serializer.text(info.getType()+"");                serializer.endTag(null, "type")                ;                serializer.startTag(null, "data");                serializer.text(info.getDate()+"");                serializer.endTag(null, "data");                serializer.endTag(null, "sms");                            }            serializer.endTag(null, "smss");            serializer.endDocument();            os.close();            Toast.makeText(this, "备份2成功", Toast.LENGTH_SHORT).show();        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }}

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3、建立SMSInfo类

/** *  */package com.hyzhou.xmldemo;public class SMSInfo {        private long date;    private int type;    private String body;    private String address;    private int id;        public long getDate() {        return date;    }    public void setDate(long date) {        this.date = date;    }    public int getType() {        return type;    }    public void setType(int type) {        this.type = type;    }    public String getBody() {        return body;    }    public void setBody(String body) {        this.body = body;    }    public String getAddress() {        return address;    }    public void setAddress(String address) {        this.address = address;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public SMSInfo() {        super();        // TODO Auto-generated constructor stub    }    public SMSInfo(long date, int type, String body, String address,int id) {        super();        this.date = date;        this.type = type;        this.body = body;        this.address = address;        this.id=id;    }        }

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附件：
back.xml结果展示

<?xml version="1.0"?>-<smss>-<sms><address>1571132</address><type>-544540687</type><body>短信内容0</body><date>短信内容0</date></sms>-<sms><address>1571133</address><type>-929821098</type><body>短信内容1</body><date>短信内容1</date></sms>-<sms><address>1571134</address><type>-467001032</type><body>短信内容2</body><date>短信内容2</date></sms>-<sms><address>1571135</address><type>-473096343</type><body>短信内容3</body><date>短信内容3</date></sms>-<sms><address>1571136</address><type>-1370139761</type><body>短信内容4</body><date>短信内容4</date></sms>-<sms><address>1571137</address><type>507788169</type><body>短信内容5</body><date>短信内容5</date></sms>-<sms><address>1571138</address><type>-995243383</type><body>短信内容6</body><date>短信内容6</date></sms>-<sms><address>1571139</address><type>-1178397444</type><body>短信内容7</body><date>短信内容7</date></sms>-<sms><address>1571140</address><type>964211414</type><body>短信内容8</body><date>短信内容8</date></sms>-<sms><address>1571141</address><type>103006854</type><body>短信内容9</body><date>短信内容9</date></sms></smss>

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back2.xml结果展示

<?xml version="1.0" encoding="UTF-8" standalone="true"?>-<smss>-<sms id="0"><body>短信内容0</body><address>1571132</address><type>-812319933</type><data>1381977444649</data></sms>-<sms id="1"><body>短信内容1</body><address>1571133</address><type>-1196295931</type><data>1381977444650</data></sms>-<sms id="2"><body>短信内容2</body><address>1571134</address><type>-1295888851</type><data>1381977444650</data></sms>-<sms id="3"><body>短信内容3</body><address>1571135</address><type>16784268</type><data>1381977444650</data></sms>-<sms id="4"><body>短信内容4</body><address>1571136</address><type>1005445253</type><data>1381977444650</data></sms>-<sms id="5"><body>短信内容5</body><address>1571137</address><type>1067452916</type><data>1381977444650</data></sms>-<sms id="6"><body>短信内容6</body><address>1571138</address><type>-293587603</type><data>1381977444650</data></sms>-<sms id="7"><body>短信内容7</body><address>1571139</address><type>1221438355</type><data>1381977444650</data></sms>-<sms id="8"><body>短信内容8</body><address>1571140</address><type>-1126016278</type><data>1381977444651</data></sms>-<sms id="9"><body>短信内容9</body><address>1571141</address><type>314137807</type><data>1381977444651</data></sms></smss>

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