A variety of mobile phone assistants are included in the SMS backup this item. The main part of the text message contains four items: Content body, Event date, mode type, number address.
SMS Backup ~ One. Use a stupid way to save text messages to an XML file, and save it in an external store. The following will be: SMS Backup ~ two (XML serializer), SMS Backup ~ Three (content providers get SMS XML backup), SMS Backup ~ Four (JSON backup database SMS). Backups are increasingly efficient and compare different ways of storage.
Obviously, the initial introduction of SMS Backup, in a simple and clumsy way, and does not involve the content provider, virtual 10 SMS.
Save the text message 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.addr ESS = Address;this.type = type;}}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;// An object that accesses a text message @overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main);//virtual 10 SMS Smslist = new arraylist<message> (); for (int i = 0; i <; i++) { Message SMS = new Message ("Little chi Good" + I, System.currenttimemillis () + "", "138" +i+i, "1"); Smslist.add (SMS);//and store SMS in the collection. }}//Click the button to trigger the backup, an IO stream stores public void Click (View v) {/////In memory, the format of the XML backup SMS is StringBuffer SB = new StringBuffer (); Sb.append (" <?xml version= ' 1.0 ' encoding= ' utf-8 ' standalone= ' yes '?> '); Sb.append ("<messages>"); for (Message SMS: Smslist) {sb.append ("<sms>"); sB.append ("<body>"); Sb.append (Sms.getbody ());//If the person who sent the text message has nothing to do, add the <body> in the text message, and 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");//The information of this nature of the text message, stored in the external storage space try {fileoutputstream fos = new FileOutputStream (file); Fos.write (Sb.tostring (). GetBytes ()); Fos.close (); catch (Exception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}}Because it involves writing to the SD card, remember to include permissions in the manifest file:
<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>
However, this approach is very clumsy, and when the user message message has a <body> tag, the last <body> there is no tail node to match. will be error, the browser cannot parse this file. This approach is not used, and knowledge provides a way of thinking. You will not encounter this problem if you follow the XML serializer to generate an XML file.
Android Simple Combat Tutorial--eighth words "SMS Backup ~ a"
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