Android Hands-on tutorial Eighth text backup

Android Hands-on tutorial Eighth text backup _android

Last Update:2017-01-19 Source: Internet

Author: User

Tags getdate stringbuffer

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All kinds of mobile phone assistants include SMS backup. Text message is mainly composed of four items: content body, Event date, mode type, numberaddress.
SMS Backup ~ One. Use a stupid way to save text messages to an XML file and save it in an external store. Follow-up will be: SMS Backup ~ II (XML serializer), SMS Backup ~ Three (content provider access to SMS XML backup); SMS Backup ~ Four (JSON backup database SMS). Backup is more and more efficient, comparing different storage methods.

Obviously, the initial introduction of SMS Backup, in a simple clumsy way, and does not involve content providers, virtual 10 SMS.

The preservation of the text message should be preserved in the form of an object. So create a JavaBean class:

Package com.itydl.createxml.domain; 
 
public class Message { 
 
 private String body; 
 private String date; 
 Private String address; 
 Private String type; 
 Public String GetBody () {return body 
  ; 
 } 
 public void Setbody (String body) { 
  this.body = body; 
 } 
 Public String GetDate () {return 
  date; 
 } 
 public void setdate (String date) { 
  this.date = date; 
 } 
 Public String getaddress () {return address 
  ; 
 } 
 public void setaddress (String address) { 
  this.address = address; 
 } 
 Public String GetType () {return 
  type; 
 } 
 public void SetType (String type) { 
  this.type = type; 
 } 
 Public message (string body, string date, string address, String type) { 
  super (); 
  This.body = body; 
  This.date = date; 
  this.address = address; 
  This.type = type; 
 }

Then the code in the mainactivity:

Package com.itydl.createxml; 
Import Java.io.File; 
Import java.io.FileNotFoundException; 
Import Java.io.FileOutputStream; 
Import java.util.ArrayList; 
 
Import java.util.List; 
 
Import Com.itheima.createxml.domain.Message; 
Import Android.os.Bundle; 
Import android.app.Activity; 
Import Android.view.Menu; 
 
Import Android.view.View; public class Mainactivity extends activity {list<message> smslist;//the object that accesses a text message @Override protected void O 
  Ncreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
   
  Setcontentview (R.layout.activity_main); 
  Virtual 10 Message Smslist = new arraylist<message> (); for (int i = 0; i < i++) {Message SMS = new Message ("Small zhi awesome" + I, System.currenttimemillis () + "", "138" +i+i, "1") 
   ; 
  Smslist.add (SMS);//and store the message in the collection. }//Click the button to trigger the backup, one IO streaming mode store public void click (View v) {//The format of XML backup SMS in memory stringbuffer SB = new StringBuffer () 
  ; Sb.append ("<?xml version= ' 1.0 ' encoding= ' utf-8 '" Standalo ")Ne= ' yes '?> '); 
  Sb.append ("<messages>"); 
    
   for (message sms:smslist) {sb.append ("<sms>"); 
   Sb.append ("<body>"); 
   Sb.append (Sms.getbody ());/If the person who sends a text message has nothing to do, add a <body&gt in the text message, so it will be an error. 
    
   Sb.append ("</body>"); 
   Sb.append ("<date>"); 
   Sb.append (Sms.getdate ()); 
    
   Sb.append ("</date>"); 
   Sb.append ("<type>"); 
   Sb.append (Sms.gettype ()); 
    
   Sb.append ("</type>"); 
   Sb.append ("<address>"); 
   Sb.append (Sms.getaddress ()); 
    
   Sb.append ("</address>"); 
  Sb.append ("</sms>"); 
   
  } sb.append ("</messages>"); File File = new file ("Sdcard/sms.xml")//message of this nature, stored in an external storage space try {fileoutputstream fos = new FileOutputStream (fi 
   Le); 
   Fos.write (Sb.tostring (). GetBytes ()); 
  Fos.close (); 
  catch (Exception e) {//TODO auto-generated catch block E.printstacktrace ();  } 
 } 
 
}

Because it involves writing to an SD card, remember to add permissions in the manifest file:

Copy Code code as follows:

<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>

Run the program, click the SMS Backup button. Export the XML file in the SD card and open it in a browser. That is, the backup of all information of SMS.
However, this approach is clumsy, and when the user text message has a <body> tag, the last <body> has no tail node to match. will be the error, the browser can not parse this file. This approach is also not used, and knowledge provides a way of thinking. Later, the XML serializer is introduced to generate XML files, and this problem is not encountered.

The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.

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