package com.lidaochen.phonecall;

 import android.net.Uri;

 import android.os.Environment;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.util.Log;

 import android.util.Xml;

 import android.view.View;

 import android.widget.Button;

 import android.widget.TabHost;

 import android.widget.ThemedSpinnerAdapter;

 import android.widget.Toast;

 import org.xmlpull.v1.XmlSerializer;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.util.ArrayList;

 import java.util.List;

 public class MainActivity extends AppCompatActivity{

     private List<Sms> smsLists;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         // 初始化我们要备份的数据

         smsLists = new ArrayList<Sms>();

         for (int i = 0; i < 10; i++)

         {

             Sms sms = new Sms();

             sms.setAddres("10000" + i);

             sms.setBody("Hello" + i);

             sms.setDate("500" + i);

             // 把sms对象加入到集合中

             smsLists.add(sms);

         }

     }

     // 按钮点击事件

     public void click(View v)

     {

         try{

             // 1、通过Xml这个工具类去获取XmlSerializer类的实例

             XmlSerializer serializer = Xml.newSerializer();

             // 2、设置XmlSerializer序列化器参数

             File file = new File(Environment.getExternalStorageDirectory().getPath(), "LiDaochen.xml");

             FileOutputStream fos = new FileOutputStream(file);

             serializer.setOutput(fos, "utf-8");

             // 3、写xml文档开头

             serializer.startDocument("utf-8", true);

             // 4、写xml根节点

             serializer.startTag(null, "smss");

             for(Sms sms:smsLists)

             {

                 serializer.startTag(null, "sms");

                 // address节点

                 serializer.startTag(null, "addres");

                 serializer.text(sms.getAddres());

                 serializer.endTag(null, "addres");

                 // body节点

                 serializer.startTag(null, "body");

                 serializer.text(sms.getBody());

                 serializer.endTag(null, "body");

                 // date节点

                 serializer.startTag(null, "date");

                 serializer.text(sms.getDate());

                 serializer.endTag(null, "date");

                 serializer.endTag(null, "sms");

             }

             // 文档结尾

             serializer.endTag(null, "smss");

             serializer.endDocument();

             // 关闭流

             fos.close();

         }

         catch (Exception e)

         {

             e.printStackTrace();

         }

     }

 }

 package com.lidaochen.phonecall;

 public class Sms {

     private String addres;

     private String body;

     private String date;

     public String getAddres() {

         return addres;

     }

     public String getBody() {

         return body;

     }

     public String getDate() {

         return date;

     }

     public void setAddres(String addres) {

         this.addres = addres;

     }

     public void setBody(String body) {

         this.body = body;

     }

     public void setDate(String date) {

         this.date = date;

     }

 }