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主类

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package com.carlos.xml;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;

public class MainActivity extends Activity {

	private List<UserInfo> infos;
	private UserInfo info;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		/**
		 * 生成List数据给下面生成xml数据使用
		 */
		crateData();

		/**
		 * 生成xml数据
		 */
		createXml();

	}

	void crateData() {
		infos = new ArrayList<UserInfo>();
		info = new UserInfo();
		info.setUsername("Carlos");
		info.setAge("21");
		infos.add(info);
		info = new UserInfo();
		info.setUsername("Jack");
		info.setAge("19");
		infos.add(info);
	}

	void createXml() {

		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		try {

			DocumentBuilder builder = dbf.newDocumentBuilder();
			Document document = builder.newDocument();
			document.setXmlVersion("1.0");
			document.setXmlStandalone(true);
			Element root = document.createElement("root");
			document.appendChild(root);

			for (int i = 0; i < infos.size(); i++) {
				info = infos.get(i);
				Element userinfo = document.createElement("userinfo");
				root.appendChild(userinfo);
				Element username = document.createElement("username");
				username.appendChild(document.createTextNode(info.getUsername()));
				Element age = document.createElement("age");
				age.appendChild(document.createTextNode(info.getAge()));
				userinfo.appendChild(username);
				userinfo.appendChild(age);
			}

			TransformerFactory tff = TransformerFactory.newInstance();
			Transformer tf = tff.newTransformer();
			DOMSource domSource = new DOMSource(document);

			/**
			 * 将生成的xml数据转换为字符串用logcat日志0打印出来
			 */
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			tf.transform(domSource, new StreamResult(baos));
			String result = baos.toString();
			Log.i("xml", "生成的xml数据为:\n" + result);

			/**
			 * 将生成的xml数据保存为一个文件
			 */
			File file = new File(Environment.getExternalStorageDirectory(),
					"userinfo.xml");
			if (!file.exists()) {
				file.createNewFile();
				Log.i("xml", "该xml文件创建成功，保存在" + file.getAbsolutePath() + "下");
			} else {
				Log.i("xml", "该xml文件已存在");
			}
			FileOutputStream fos = new FileOutputStream(file);
			StreamResult xmlResult = new StreamResult(fos);
			tf.transform(domSource, xmlResult);

			baos.close();
			fos.close();
		} catch (ParserConfigurationException e) {
			e.printStackTrace();
		} catch (TransformerConfigurationException e) {
			e.printStackTrace();
		} catch (TransformerException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
}

UserInfo类

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package com.carlos.xml;

public class UserInfo {

	private String username;
	private String age;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}

}

Logcat结果

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