Android - XML序列化

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