Android

1、xml文件的序列化：采用XmlSerializer来实现XML文件的序列化。相比传统方式，更高效安全

MainActivity.java

package com.example.test_buildxmlfile;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import org.xmlpull.v1.XmlSerializer;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.util.Xml;
import android.view.View;
import android.widget.Toast;

import com.example.test_getxmlfile.R;
import com.test.MsgInfo.MsgInfo;

/**
 * @author daomul
 *  主入口:xml文件的序列化
 */
public class MainActivity extends Activity {

    private List<MsgInfo> msgList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        msgList = new ArrayList<MsgInfo>();
        Random random= new Random(); //随机的 （1：发送      2 ：接收）
        long number = 1340000001;    //手机地址
        
        //连续生成10条默认短信
        for (int i = 0; i < 10; i++) {
            msgList.add(new MsgInfo(System.currentTimeMillis(), random.nextInt(2), 
                    "text MSg"+i,Long.toString(number+i),i ));
        }
    }
 
    /**
     * 短信信息备份
     * @param view 点击事件触发
     */
    public void MsgSave(View view){
        
        try {
            //XML序列化
            XmlSerializer serializer= Xml.newSerializer();

            File file=new File(Environment.getExternalStorageDirectory(),"test.xml");
            FileOutputStream os= new FileOutputStream(file);
            
            serializer.setOutput(os, "utf-8");//os 是导出的文件位置  encoding 指代utf-8
            serializer.startDocument("utf-8", true);

            serializer.startTag(null, "msgs");
            for (MsgInfo msg:msgList) {
                serializer.startTag(null, "msg");
                serializer.attribute(null, "msg", msg.getId()+"");//添加ID属性
                
                serializer.startTag(null, "body");
                serializer.text(msg.getBody());
                serializer.endTag(null, "body");

                serializer.startTag(null, "address");
                serializer.text(msg.getAddress());
                serializer.endTag(null, "address");

                serializer.startTag(null, "type");
                serializer.text(msg.getType()+"");
                serializer.endTag(null, "type");
                
                serializer.startTag(null, "date");
                serializer.text(msg.getDate()+"");
                serializer.endTag(null, "date");
                
                serializer.endTag(null, "msg");
            }
            serializer.endTag(null, "msgs");
            
            serializer.endDocument();
            
            os.close();
            Toast.makeText(this, "XML序列化成功", 0).show();
            
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Toast.makeText(this, "XML序列化失败", 0).show();
        } 
    }
}

　　　　

MsgInfo.java

package com.test.MsgInfo;

/**
 * @author daomul
 * 短信信息
 */

public class MsgInfo {
    
    private long date;
    private int type;
    private String body;
    private String address;
    private int id;
    
    //无参构造方法
    public MsgInfo() {
        
    }
    
    //有参构造方法 Generate Constructor use fields...
    public MsgInfo(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;
    }

    //setter and getter
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = 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;
    }
    
    

}

注： 写文件到SD卡中需要 user 权限