在android平台中，我们经常会用到sharedPreference之类的东西，sharedPreference其实就是生成xml文件，然后去读写的过程。
下面请看一下代码目录：
源码如下：
package com.leo.writexml;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
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.Xml;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
import com.leo.writexml.domain.SmsInfo;
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 = 1580000001;
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 + i),i));
}
}
@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;
}
public void backupSms(View view){
//假设我已获得了所有的短信
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("<body>");
sb.append(info.getBody());
sb.append("</body>");
sb.append("<date>");
sb.append(info.getDate());
sb.append("</date>");
sb.append("<type>");
sb.append(info.getType());
sb.append("</type>");
sb.append("<address>");
sb.append(info.getAddress());
sb.append("</address>");
sb.append("</sms>");
}
sb.append("</smss>");
File file = new File(Environment.getExternalStorageDirectory(),"smsinfo.xml");
try {
FileOutputStream fos = new FileOutputStream(file);
fos.write(sb.toString().getBytes());
fos.close();
Toast.makeText(this,"备份 成功",0).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(this,"备份失败",0).show();
}
}
/**
* 第二种方式来生成xml文件
* @param view
*/
public void backupSms2(View view){
XmlSerializer serializer = Xml.newSerializer();//xml序列化
try {
File file = new File(Environment.getExternalStorageDirectory(),"backupsms2.xml");
FileOutputStream fos = new FileOutputStream(file);
serializer.setOutput(fos,"utf-8");
serializer.startDocument("utf-8",true);
serializer.startTag(null,"smss");
for(SmsInfo info :smsInfos){
serializer.startTag(null,"sms");
serializer.attribute(null,"id",info.getId()+"");
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();
fos.close();
Toast.makeText(this,"备份成功",0).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(this,0).show();
}
}
}
smsinfo文件:
package com.leo.writexml.domain;
public class SmsInfo {
private long date;
private int type;
private String body;
private String address;
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public SmsInfo() {
}
public SmsInfo(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;
}
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;
}
}
androidmanifist.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.leo.writexml"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.leo.writexml.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest> activity_main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/btn"
android:onClick="backupSms"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="199dp"
android:text="生成XML文件" />
<Button
android:layout_below="@id/btn"
android:onClick="backupSms2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第二种方式生成XML文件" />
</RelativeLayout>
