1、创建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" tools:context=".MainActivity" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="99dp" android:onClick="bck" android:text="@string/bcak" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@+id/button1" android:layout_centerVertical="true" android:onClick="pck" android:text="@string/back2" /> </RelativeLayout>
2、编写MainActivity类
package com.hyzhou.xmldemo; import java.io.File; 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.os.Bundle; import android.os.Environment; import android.app.Activity; import android.util.Log; import android.util.Xml; import android.view.Menu; import android.view.View; import android.widget.Toast; public class MainActivity extends Activity { private List<SMSInfo> smsinfo; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); smsinfo=new ArrayList<SMSInfo>(); Random random=new Random(); long number=1571132; for (int i = 0; i < 10; i++) { smsinfo.add(new SMSInfo(System.currentTimeMillis(), random.nextInt()+1, "短信内容"+i, Long.toString(number+i),i)); } } //第一种实现方式 public void bck(View view) { StringBuilder sb=new StringBuilder(); sb.append("<smss>"); for (SMSInfo info : smsinfo) { 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.getBody()); sb.append("</date>"); sb.append("</sms>"); } sb.append("</smss>"); try { File file=new File(Environment.getExternalStorageDirectory(),"back.xml"); FileOutputStream fos=new FileOutputStream(file); fos.write(sb.toString().getBytes()); fos.close(); Toast.makeText(this, "备份成功", Toast.LENGTH_SHORT).show(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(this, "备份失败", Toast.LENGTH_SHORT).show(); } } //第二种实现方式，推荐使用第二种方式 public void pck(View view) { try { XmlSerializer serializer=Xml.newSerializer(); File file=new File(Environment.getExternalStorageDirectory(),"back2.xml"); FileOutputStream os = new FileOutputStream(file); //初始化序列号器指定xml数据写到哪个文件，并且指定文件的编码方式 serializer.setOutput(os, "utf-8"); serializer.startDocument("utf-8", true); serializer.startTag(null, "smss"); for (SMSInfo info : smsinfo) { 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, "data"); serializer.text(info.getDate()+""); serializer.endTag(null, "data"); serializer.endTag(null, "sms"); } serializer.endTag(null, "smss"); serializer.endDocument(); os.close(); Toast.makeText(this, "备份2成功", Toast.LENGTH_SHORT).show(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } }
3、建立SMSInfo类
/** * */ package com.hyzhou.xmldemo; public class SMSInfo { private long date; private int type; private String body; private String address; private int 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; } public int getId() { return id; } public void setId(int id) { this.id = id; } public SMSInfo() { super(); // TODO Auto-generated constructor stub } 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; } }
附件：
back.xml结果展示
<?xml version="1.0"?> -<smss>-<sms><address>1571132</address><type>-544540687</type><body>短信内容0</body><date>短信内容0</date></sms>-<sms><address>1571133</address><type>-929821098</type><body>短信内容1</body><date>短信内容1</date></sms>-<sms><address>1571134</address><type>-467001032</type><body>短信内容2</body><date>短信内容2</date></sms>-<sms><address>1571135</address><type>-473096343</type><body>短信内容3</body><date>短信内容3</date></sms>-<sms><address>1571136</address><type>-1370139761</type><body>短信内容4</body><date>短信内容4</date></sms>-<sms><address>1571137</address><type>507788169</type><body>短信内容5</body><date>短信内容5</date></sms>-<sms><address>1571138</address><type>-995243383</type><body>短信内容6</body><date>短信内容6</date></sms>-<sms><address>1571139</address><type>-1178397444</type><body>短信内容7</body><date>短信内容7</date></sms>-<sms><address>1571140</address><type>964211414</type><body>短信内容8</body><date>短信内容8</date></sms>-<sms><address>1571141</address><type>103006854</type><body>短信内容9</body><date>短信内容9</date></sms></smss>
back2.xml结果展示
<?xml version="1.0" encoding="UTF-8" standalone="true"?> -<smss>-<sms id="0"><body>短信内容0</body><address>1571132</address><type>-812319933</type><data>1381977444649</data></sms>-<sms id="1"><body>短信内容1</body><address>1571133</address><type>-1196295931</type><data>1381977444650</data></sms>-<sms id="2"><body>短信内容2</body><address>1571134</address><type>-1295888851</type><data>1381977444650</data></sms>-<sms id="3"><body>短信内容3</body><address>1571135</address><type>16784268</type><data>1381977444650</data></sms>-<sms id="4"><body>短信内容4</body><address>1571136</address><type>1005445253</type><data>1381977444650</data></sms>-<sms id="5"><body>短信内容5</body><address>1571137</address><type>1067452916</type><data>1381977444650</data></sms>-<sms id="6"><body>短信内容6</body><address>1571138</address><type>-293587603</type><data>1381977444650</data></sms>-<sms id="7"><body>短信内容7</body><address>1571139</address><type>1221438355</type><data>1381977444650</data></sms>-<sms id="8"><body>短信内容8</body><address>1571140</address><type>-1126016278</type><data>1381977444651</data></sms>-<sms id="9"><body>短信内容9</body><address>1571141</address><type>314137807</type><data>1381977444651</data></sms></smss>
