Android开发之xml文件的序列化

package com.example.xmlserializer;

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

import org.xmlpull.v1.XmlSerializer;

import com.example.xmlserializer.domain.UserInfo;

import android.os.Bundle;
import android.os.Environment;
import android.util.Xml;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.app.Activity;

public class MainActivity extends Activity implements OnClickListener {

	private List<UserInfo> users;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button save = (Button) findViewById(R.id.btnSave);
		save.setOnClickListener(this);
		users = new ArrayList<UserInfo>();
		for (int i = 0; i < 5; i++) {
			users.add(new UserInfo("aaa" + i, i, "男", 1110, i));
		}
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.btnSave:
			SaveXml();
			break;

		default:
			break;
		}
	}

	private void SaveXml() {
		try {
			XmlSerializer serialzer = Xml.newSerializer();
			File file = new File(Environment.getExternalStorageDirectory()
					+ File.separator + "backup.xml");
			FileOutputStream fos = new FileOutputStream(file);
			serialzer.setOutput(fos, "utf-8");
			serialzer.startDocument("utf-8", true); // 文件开头
			serialzer.startTag(null, "users"); // xml文件的根标签
			for (UserInfo user : users) {
				serialzer.startTag(null, "user");
				serialzer.attribute(null, "id", user.getId() + "");

				serialzer.startTag(null, "name");
				serialzer.text(user.getName());
				serialzer.endTag(null, "name");

				serialzer.startTag(null, "age");
				serialzer.text(user.getAge() + "");
				serialzer.endTag(null, "age");

				serialzer.startTag(null, "sex");
				serialzer.text(user.getSex());
				serialzer.endTag(null, "sex");

				serialzer.startTag(null, "brithday");
				serialzer.text(user.getBrithday() + "");
				serialzer.endTag(null, "brithday");

				serialzer.endTag(null, "user");
			}
			serialzer.endTag(null, "users");
			serialzer.endDocument(); // 文件结尾
			fos.close();
			Toast.makeText(this, "保存成功", Toast.LENGTH_LONG).show();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			Toast.makeText(this, "保存失败", Toast.LENGTH_LONG).show();
		}
	}
}