android开发教程之listview显示sqlite数据

代码如下:
package com.it.db;

import java.util.List;
import com.it.dao.PersonDao;
import com.it.domain.Person;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
 private ListView lv;
 private List<Person> persons;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  PersonDao dao=new PersonDao(this);
  persons=dao.findAll();
  lv=(ListView) findViewById(R.id.lv);
  lv.setAdapter(new MyAdapter());
  lv.setOnItemClickListener(new OnItemClickListener() {
   //点击的数据 传到上一个activity
   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
    // TODO Auto-generated method stub
    Person mperson=persons.get(position);
    String number=mperson.getNumber();
    Intent data=new Intent();
    data.putExtra("number", number);
    setResult(0, data);
    //点击 即关闭此activity
    finish();
   }
  });
 }
 private class MyAdapter extends BaseAdapter{
  private static final String TAG = "MyAdapter";

  
  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return persons.size();
  }

  @Override
  public Object getItem(int position) {
   // TODO Auto-generated method stub
   return null;
  }

  @Override
  public long getItemId(int position) {
   // TODO Auto-generated method stub
   return 0;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   // TODO Auto-generated method stub
   
   Person person=persons.get(position);
   View view=View.inflate(MainActivity.this, R.layout.list_item, null);
   TextView tv_id=(TextView) view.findViewById(R.id.tv_id);
   tv_id.setText("id:"+person.getId());
   TextView tv_name=(TextView) view.findViewById(R.id.tv_name);
   tv_name.setText("姓名:"+person.getName());
   TextView tv_number=(TextView) view.findViewById(R.id.tv_number);
   tv_number.setText("电话:"+person.getNumber());
   return view;
   }
   
 }
}

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