存储方式二:文件（XML SAX解析）

LinkMan.java

package com.example.saxdemo;

public class LinkMan {
	private String name;
	private String email;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
}

MySAX.java

package com.example.saxdemo;

import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class MySAX extends DefaultHandler {

	private List<LinkMan> all=null;
	private LinkMan man=null;
	private String curElement=null;
	@Override
	public void startDocument() throws SAXException {
		all=new ArrayList<LinkMan>();
	}
	
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		if(localName.equals("linkman")){
			man=new LinkMan();
		}
		curElement=localName;
	}
	
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		if(man!=null){
			if(curElement.equals("name")){
				man.setName(new String(ch, start, length));
			}
			if(curElement.equals("email")){
				man.setEmail(new String(ch, start, length));
			}
		}
	}

	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		if(localName.equals("linkman")){
			all.add(man);
			man=null;
		}
		curElement=null;
	}
	
	@Override
	public void endDocument() throws SAXException {
		// TODO Auto-generated method stub
		super.endDocument();
	}

	public List<LinkMan> getAll() {
		return all;
	}
}

MainActivity.java

package com.example.saxdemo;

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

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private TextView name=null;
	private TextView email=null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		name=(TextView)findViewById(R.id.name);
		email=(TextView)findViewById(R.id.email);
		if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
			File file=new File(Environment.getExternalStorageDirectory()+File.separator+"files/addresslist.xml");
			if(!file.exists()){//文件不存在
				return;
			}
			SAXParserFactory factory=SAXParserFactory.newInstance();
			SAXParser parser=null;
			try {
				parser=factory.newSAXParser();
			} catch (ParserConfigurationException | SAXException e) {
				e.printStackTrace();
			}
			MySAX mySAX=new MySAX();
			try {
				parser.parse(file, mySAX);
			} catch (SAXException | IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			List<LinkMan> all=mySAX.getAll();
			name.setText(all.get(0).getName());
			email.setText(all.get(0).getEmail());
		}else{
			Toast.makeText(this, "没有sdcard", Toast.LENGTH_LONG).show();
		}
	}
}