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package com.carlos.xml;

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 org.xmlpull.v1.XmlSerializer;

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

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() {

		File file = new File(Environment.getExternalStorageDirectory()+ "/userinfo.xml");
		try {
			file.createNewFile();
		} catch (IOException e) {
			e.printStackTrace();
		}
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(file);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}

		XmlSerializer serializer = Xml.newSerializer();
		try {
			serializer.setOutput(fos, "UTF-8");
			serializer.startDocument(null, Boolean.valueOf(true));
			serializer.startTag(null, "root");
			for (int i = 0; i < infos.size(); i++) {
				info = infos.get(i);
				serializer.startTag(null, "userinfo");
				serializer.startTag(null, "username");
				serializer.text(info.getUsername());
				serializer.endTag(null, "username");
				serializer.startTag(null, "age");
				serializer.text(info.getAge());
				serializer.endTag(null, "age");
				serializer.endTag(null, "userinfo");
			}
			serializer.endTag(null, "root");
			serializer.endDocument();
			serializer.flush();
			fos.close();

		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalStateException 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;
	}
	
}

将Android Studio转换到DDMS窗口的File Explorer下可以看到在mnt下的sdcard目录中生成了userinfo.xml文件。

将该文件导出查看生成的XML如下

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