Android ListView简单实用

layout创建：

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:orientation="vertical" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context="com.example.person.MainActivity"
    >
    
    <LinearLayout 
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    android:orientation="horizontal" >
	    <TextView  
	        android:layout_width="100dp"
	   		android:layout_height="wrap_content"
	   		android:text="@string/name"
	    />
	    
	    <TextView  
	        android:layout_width="100dp"
	   		android:layout_height="wrap_content"
	   		android:text="@string/sex"
	    />
	    
	    <TextView  
	        android:layout_width="100dp"
	   		android:layout_height="wrap_content"
	   		android:text="@string/age"
	    />
	</LinearLayout>
    
    
    
    <ListView  android:layout_width="fill_parent"
    	android:layout_height="fill_parent"
    	android:id="@+id/listView"
    	/>
    
</LinearLayout>

item.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >
    
    <TextView  
        android:layout_width="100dp"
   		android:layout_height="wrap_content"
   		android:id="@+id/name"
    />
    
    <TextView  
        android:layout_width="100dp"
   		android:layout_height="wrap_content"
   		android:id="@+id/sex"
    />
    
    <TextView  
        android:layout_width="100dp"
   		android:layout_height="wrap_content"
   		android:id="@+id/age"
    />

</LinearLayout>

　　

UserDao  插入数据， 分页查询数据

/**
 * 
 */
package com.example.person.dao;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.nfc.Tag;
import android.os.Build.VERSION;
import android.util.Log;

/**
 * 
 * @author baoxing.gbx
 * @version $Id: DBopenHelper.java, v 0.1 2015年7月11日 下午9:39:03 baoxing.gbx Exp $
 */
public class DBopenHelper extends SQLiteOpenHelper{

    /** 数据库名称  */
    private static final String DB_NAME = "test.db";
    
    private static final int  VERSION = 1;
    
    private static final String Tag = "DBopenHelper";
    
   
    // 初始化数据库开启装置
    public DBopenHelper(Context context) {
        super(context, DB_NAME, null, VERSION);
        // TODO Auto-generated constructor stub
    }

    // 
    @Override
    public void onCreate(SQLiteDatabase db) {
        Log.i(Tag, "onCreate 被调用");
        db.execSQL("create table user (id integer primary key autoincrement, name varchar(20),sex varchar(20), age integer )");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        Log.i(Tag, "onUpgrade 被调用");
        db.execSQL("DROP TABLE IF EXISTS person");
        onCreate(db);
    }

}

/**
 * 
 */
package com.example.person.dao;

import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.database.Cursor;
import com.example.person.vo.User;

/**
 * 
 * @author baoxing.gbx
 * @version $Id: UserDao.java, v 0.1 2015年7月11日 下午10:44:09 baoxing.gbx Exp $
 */
public class UserDao {
    String tableName = "user";
    DBopenHelper dbopenHelper;
    
    public UserDao (DBopenHelper dBopenHelper) {
        this.dbopenHelper = dBopenHelper;
    }
    
    public long save(User user) {
        ContentValues values = new ContentValues();
        values.put("name", user.getName());
        values.put("sex", user.getSex());
        values.put("age", user.getAge());
        long result = dbopenHelper.getWritableDatabase().insert(tableName, null, values);
        return result;
    }
    
    public List<User> queryPage(int startRow, int pageSize) {
        String limit = startRow + "," + pageSize;
        Cursor cursor = dbopenHelper.getReadableDatabase().query(tableName, null, null, null, null, null, null, limit);
        List<User> users = new ArrayList<User>();
        while (cursor.moveToNext()) {
            User user = new User();
            user.setId(cursor.getInt(cursor.getColumnIndex("id")));
            user.setName(cursor.getString(cursor.getColumnIndex("name")));
            user.setSex(cursor.getString(cursor.getColumnIndex("sex")));
            user.setAge( cursor.getInt(cursor.getColumnIndex("age")));
            users.add(user);
        }
        return users;
    }

}

　　

MainActivity显示数据

package com.example.person;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;

import com.example.person.dao.DBopenHelper;
import com.example.person.dao.UserDao;
import com.example.person.vo.User;

public class MainActivity extends ActionBarActivity {
    
    private ListView listView;
    
    private UserDao userDao ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView)findViewById(R.id.listView);
        userDao = new UserDao(new DBopenHelper(this));
        
        // 简单适配器
//        show1();
        
        // 简单适配器
        show2();
        
    }
    
    /**
     * 自定义是配置显示
     */
    private void show2() {
        List<User> users = userDao.queryPage(0, 20);
        
        listView.setAdapter(new MyAdapter(this, users, R.layout.item));
    }

    /**
     * 普通是配置适配ListView
     */
    private void show1() {
        List<User> users = userDao.queryPage(0, 20);
        List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
        for (User user : users) {
            Map<String, Object> map = new HashMap<String, Object>();
            map.put("name", user.getName());
            map.put("sex", user.getSex());
            map.put("age", user.getAge());
            data.add(map);
        }
        SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item, 
            new String[] {"name", "sex", "age"}, new int[] {R.id.name, R.id.sex, R.id.age});
        
        listView.setAdapter(adapter);
    }
}

　　

自定义适配器

package com.example.person;

import java.util.List;

import com.example.person.vo.User;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter{
    
    private List<User> users;
    private int  resource;
    
    private LayoutInflater inflater; 

    public MyAdapter(Context context,List<User> users, int resource) {
        super();
        this.users = users;
        this.resource = resource;
        this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public MyAdapter() {
        super();
        // TODO Auto-generated constructor stub
    }

    @Override
    public int getCount() {
        return users.size();
    }

    @Override
    public Object getItem(int position) {
        return users.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (null == convertView) {
            convertView = inflater.inflate(resource, null);
        }
       ( (TextView)convertView.findViewById(R.id.name)).setText(users.get(position).getName());
       ( (TextView)convertView.findViewById(R.id.sex)).setText(users.get(position).getSex());
       ( (TextView)convertView.findViewById(R.id.age)).setText(users.get(position).getAge()+"");
        return convertView;
    }

}