android中ListView的使用

应用截图：

一：ListView的布局文件，main.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="vertical" >

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
        android:text="@string/name"
        android:layout_width="120dp"
        android:layout_height="25dp"
    	/>
    
    <TextView
       android:text="@string/phone"
        android:layout_width="150dp"
        android:layout_height="25dp"
    	/>
    
    <TextView
        android:text="@string/amount"
        android:layout_width="fill_parent"
        android:layout_height="25dp"
    	/>
    </LinearLayout>

    <ListView
        android:id="@+id/listView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

其次，还需要一个item.xml，用于在ListView控件里面显示每一行：

<?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="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/name"
        android:layout_width="120dp"
        android:layout_height="25dp"
    	/>
    
    <TextView
        android:id="@+id/phone"
        android:layout_width="150dp"
        android:layout_height="25dp"
    	/>
    
    <TextView
        android:id="@+id/amount"
        android:layout_width="fill_parent"
        android:layout_height="25dp"
    	/>

</LinearLayout>

二：使用SQLite数据库，以及业务逻辑类：

package com.zizhu.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DBOpenHelper extends SQLiteOpenHelper {
	
	public static final String DATABASE = "user.db";
	
	public DBOpenHelper(Context context) {
		super(context, DATABASE, null, 1);
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		db.execSQL("create table t_user (id integer primary key autoincrement, name varchar(20), phone varchar(11), amount integer)");
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		
	}

}

package com.zizhu.service;

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

import com.zizhu.db.DBOpenHelper;
import com.zizhu.model.User;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;

public class UserService {
	
	private DBOpenHelper openHelper = null;	
	
	public UserService(Context context) {
		openHelper = new DBOpenHelper(context);
	}
	
	//分页查询
	public List<User> getUsers(int over, int count){
		List<User> users = new ArrayList<User>();
		Cursor cursor = openHelper.getReadableDatabase().rawQuery("select id, name, phone, amount from t_user limit ?, ?", new String[]{over+"", count + ""});
		while(cursor.moveToNext()){
			User u = new User();
			u.setId(cursor.getInt(cursor.getColumnIndex("id")));
			u.setName(cursor.getString(cursor.getColumnIndex("name")));
			u.setPhone(cursor.getString(cursor.getColumnIndex("phone")));
			u.setAmount(cursor.getInt(cursor.getColumnIndex("amount")));
			users.add(u);
		}
		return users;
	}

	//添加
	public void save(User user){
		ContentValues values = new ContentValues();
		values.put("name", user.getName());
		values.put("phone", user.getPhone());
		values.put("amount", user.getAmount());
		openHelper.getWritableDatabase().insert("t_user", null, values);
	}

	//分页查询，返回游标
	public Cursor getCursorData(int over, int count) {
		return openHelper.getReadableDatabase().rawQuery("select id _id, name, phone, amount from t_user limit ?, ?", new String[]{over+"", count + ""});
	}
	
}

三.最后一个是MainActivity:

package com.zizhu.listview;

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

import com.zizhu.model.User;
import com.zizhu.service.UserService;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;

public class MainActivity extends Activity {
	
	private ListView view = null;
	private UserService userService = null;
	
	private final static String [] columns = {"name", "phone", "amount"};
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        view = (ListView)findViewById(R.id.listView);
        userService = new UserService(this.getApplicationContext());
//        initData();
        initData2();
    }

    private void initData() {
    	List<User> users = userService.getUsers(0, 10);
    	List<HashMap<String,Object>> datas = new ArrayList<HashMap<String, Object>>();
    	for(User u : users){
    		HashMap<String, Object> map = new HashMap<String, Object>();
    		map.put(columns[0], u.getName());
    		map.put(columns[1], u.getPhone());
    		map.put(columns[2], u.getAmount());
    		datas.add(map);
    	}
    	SimpleAdapter adapter = new SimpleAdapter(this, datas, R.layout.item, columns, new int[]{R.id.name, R.id.phone, R.id.amount});
    	view.setAdapter(adapter);
    }
    
	private void initData2() {
		//使用这个类，必须使用"_id"列，如果不存在此列，可以使用别名指定这个列
		SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.item, userService.getCursorData(0, 10), columns, new int[]{R.id.name, R.id.phone, R.id.amount});
		view.setAdapter(adapter);
	}
}