采用xml的方式保存数据

时间：2024-11-11 14:37:32
 package com.example.myxmlmake;

 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 com.example.myxmlmake.domain.SmsInfo;

 import android.os.Bundle;

 import android.os.Environment;

 import android.app.Activity;

 import android.util.Xml;

 import android.view.Menu;

 import android.view.View;

 import android.widget.Toast;

 public class MainActivity extends Activity {

     private List<SmsInfo> smsInfos;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         smsInfos = new ArrayList<SmsInfo>();

         Random random = new Random();

         long number = 135000001;

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

         {

             smsInfos.add(new SmsInfo(System.currentTimeMillis(),random.nextInt(2)+1,"短信内容"+i, Long.toString(number++)));

         }

     }

     public void mybackup1(View view)

     {

         StringBuilder sb = new StringBuilder();

         sb.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");

         sb.append("<smss>");

         for(SmsInfo info : smsInfos)

         {

             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.getDate());

             sb.append("</date>");

             sb.append("</sms>");

         }

         sb.append("</smss>");

         try{

         File file = new File(Environment.getExternalStorageDirectory(),"myback1.xml");

         FileOutputStream fos = new FileOutputStream(file);

         fos.write(sb.toString().getBytes());

         fos.close();

         Toast.makeText(this, "生成成功!", 0).show();

         }catch(Exception e){

             e.printStackTrace();

             Toast.makeText(this, "生成失败!", 0).show();

         }

     }

     public void mybackup2(View view)

     {

         try

         {

             XmlSerializer serializer = Xml.newSerializer();

             File file = new File(Environment.getExternalStorageDirectory(),"myback2.xml");

             FileOutputStream os = new FileOutputStream(file);

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

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

             serializer.startTag(null, "smss");

             for(SmsInfo info : smsInfos)

             {

                 serializer.startTag(null, "sms");

                 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, "date");

                 serializer.text(info.getDate() + "");

                 serializer.endTag(null, "date");

                 serializer.endTag(null, "sms");

             }

             serializer.endTag(null, "smss");

             serializer.endDocument();

             os.close();

             Toast.makeText(this, "生成成功!", 0).show();

         }catch(Exception e){

             e.printStackTrace();

             Toast.makeText(this, "生成失败!", 0).show();

         }

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         getMenuInflater().inflate(R.menu.main, menu);

         return true;

     }

 }

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