Android下生成xml的方式
第一种 字符串拼凑
package com.itheima.generatexml;
public class Sms {
private String address;
private String body;
private String date;
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
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;
}
}
package com.itheima.generatexml;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
private List<Sms> smsLists;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//[1]初始化我们要备份的数据
smsLists = new ArrayList<Sms>();
for (int i = 0; i < 10; i++) {
Sms sms =new Sms();
sms.setAddress("10008"+i);
sms.setBody("nihao"+i);
sms.setDate("201"+i);
//[2]把sms对象加入到 集合中
smsLists.add(sms);
}
}
//点击按钮 通过StringBuffer 的方式生成一个xml文件
public void click(View v){
//[1]创建sb对象
StringBuffer sb = new StringBuffer();
//[2]开始组拼xml文件头
sb.append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
//[3]开始组拼xml根节点
sb.append("<smss>");
//[4]开始组拼sms节点
for (Sms sms : smsLists) {
sb.append("<sms>");
//[5]开始组拼address节点
sb.append("<address>");
sb.append(sms.getAddress());
sb.append("</address>");
//[6]开始组拼body节点
sb.append("<body>");
sb.append(sms.getBody());
sb.append("</body>");
//[7]开始组拼date节点
sb.append("<date>");
sb.append(sms.getDate());
sb.append("</date>");
sb.append("</sms>");
}
sb.append("</smss>");
//[8]把数据保存到sd卡中
try {
File file = new File(Environment.getExternalStorageDirectory().getPath(),"smsbackup.xml");
FileOutputStream fos = new FileOutputStream(file);
fos.write(sb.toString().getBytes());
fos.close();//关闭流
} catch (Exception e) {
e.printStackTrace();
}
}
}
第二种 XmlSerializer实现
package com.itheima.generatexml;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlSerializer;
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 com.itheima.generatexml2.R;
public class MainActivity extends Activity {
private List<Sms> smsLists;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//[1]初始化我们要备份的数据
smsLists = new ArrayList<Sms>();
for (int i = 0; i < 10; i++) {
Sms sms =new Sms();
sms.setAddress("10008"+i);
sms.setBody("nihao"+i);
sms.setDate("201"+i);
//[2]把sms对象加入到 集合中
smsLists.add(sms);
}
}
//点击按钮 通过的XmlSerializer方式生成一个xml文件
public void click(View v){
try {
//[1]获取XmlSerializer 类的实例 通过Xml这个工具类去获取
XmlSerializer serializer = Xml.newSerializer();
//[2]设置 xmlserializer序列化器参数
File file = new File(Environment.getExternalStorageDirectory().getPath(),"smsbackup2.xml");
FileOutputStream fos = new FileOutputStream(file);
serializer.setOutput(fos, "utf-8");
//[3]开始写xml文档开头
serializer.startDocument("utf-8", true);
//[4]写 xml的根节点 namespace 命名空间
serializer.startTag(null, "smss");
//[5]循环写 sms节点
for (Sms sms : smsLists) {
serializer.startTag(null, "sms");
// [6]开始address节点
serializer.startTag(null, "address");
serializer.text(sms.getAddress());
serializer.endTag(null,"address");
// [7]开始body节点
serializer.startTag(null, "body");
serializer.text(sms.getBody());
serializer.endTag(null,"body");
// [8]开始date节点
serializer.startTag(null, "date");
serializer.text(sms.getDate());
serializer.endTag(null,"date");
//sms节点结束
serializer.endTag(null, "sms");
}
serializer.endTag(null, "smss");
//写文档结尾
serializer.endDocument();
fos.close();//关闭流
} catch (Exception e) {
e.printStackTrace();
}
}
}
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作者：长江某菜鸟
来源：CSDN
原文：https://blog.csdn.net/qq_33729889/article/details/59502661
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