005_01XML_Serilizer

将javabean的成员变量序列化保存到xml文件中，用于存储数据到本地。
Book.java

package com.example.bean;

public class Book {

     private String bookname;
     private String author;
     private String priceString;
     
     
    @Override
    public String toString() {
        return "Book [bookname=" + bookname + ", author=" + author
                + ", priceString=" + priceString + "]";
    }
    
    public String getBookname() {
        return bookname;
    }
    public void setBookname(String bookname) {
        this.bookname = bookname;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public String getPriceString() {
        return priceString;
    }
    public void setPriceString(String priceString) {
        this.priceString = priceString;
    }

    public Book(String bookname, String author, String priceString) {
        super();
        this.bookname = bookname;
        this.author = author;
        this.priceString = priceString;
    }
     
     
}

MainActivity.java

package com.example.day_05xmlserilizer;

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

import org.xmlpull.v1.XmlSerializer;

import com.example.bean.Book;

import android.app.Activity;
import android.os.Bundle;
import android.util.Xml;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

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

    private void savebeantoxml() {
        Book book1 = new Book("浪潮之巅", "吴军", "30");
        Book book2 = new Book("数学之美", "吴军", "20");
        
        List<Book> bookList = new ArrayList<Book>();
        bookList.add(book1);
        bookList.add(book2);
        
        XmlSerializer xs = Xml.newSerializer();
        FileOutputStream fos = null;
        
        File file = new File(getFilesDir(), "books.xml");
        
        
        try {
            fos = new FileOutputStream(file);
            xs.setOutput(fos, "utf-8");
            xs.startDocument("utf-8", true);
            xs.startTag(null, "books");
            for(Book book:bookList){
                xs.startTag(null, "book");
                    //bookname节点
                    xs.startTag(null, "bookname");
                    xs.attribute(null, "id", "01");
                    xs.text(book.getBookname());
                    xs.endTag(null, "bookname");
                    //author节点
                    xs.startTag(null, "author");
                    xs.text(book.getAuthor());
                    xs.endTag(null, "author");
                    //price节点
                    xs.startTag(null, "price");
                    xs.text(book.getPriceString());
                    xs.endTag(null, "price");
                xs.endTag(null, "book");        
            }
            xs.endTag(null, "books");
            xs.endDocument();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {        
            e.printStackTrace();
        }
    }
}