Android实战简易课程-第四十七枪（ListView多选-实现点餐系统）_Android

Android实战简易教程-第四十七枪（ListView多选-实现点餐系统）

一般在外卖的选单中常常会用到ListView的多选，大家可以改进后加入自己的项目中。下面看一下代码：

一、代码

1.main.xml:（由一个ListView和一个Button组成）

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ListView        android:id="@+id/drink_list"        android:layout_width="fill_parent"        android:layout_height="0dp"        android:layout_weight="1" >    </ListView>    <Button        android:id="@+id/btn_commit"        android:layout_width="match_parent"        android:layout_height="58dp"        android:text="确定" /></LinearLayout>

2.item.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff"    android:orientation="horizontal" >    <CheckBox        android:id="@+id/check_box"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:clickable="false"        android:focusable="false"        android:focusableInTouchMode="true" />    <ImageView        android:id="@+id/food_imager"        android:layout_width="50dp"        android:layout_height="50dp"        android:background="#ffffff" />    <TextView        android:id="@+id/food_name"        android:layout_width="100dp"        android:layout_height="50dp"        android:text="咖啡"        android:gravity="center_vertical"        android:layout_marginLeft="10dp"        android:textSize="18sp" />    <TextView        android:layout_width="wrap_content"        android:layout_height="50dp"        android:text="单价：RMB  "        android:paddingLeft="20dp"        android:textSize="12sp" />    <TextView        android:id="@+id/price"        android:layout_width="wrap_content"        android:layout_height="50dp"        android:paddingRight="10dp"        android:text="18"        android:layout_marginLeft="20dp"        android:textSize="18sp" /></LinearLayout>

3.Food.java:(bean类)

package com.example.info;public class Food {	public int food_img;	public String food_name;	public String food_price;	public String text;	public int getFood_img() {		return food_img;	}	public void setFood_img(int food_img) {		this.food_img = food_img;	}	public String getFood_name() {		return food_name;	}	public void setFood_name(String food_name) {		this.food_name = food_name;	}	public String getFood_price() {		return food_price;	}	public void setFood_price(String food_price) {		this.food_price = food_price;	}	public Food(int food_img, String food_name, String food_price) {		super();		this.food_img = food_img;		this.food_name = food_name;		this.food_price = food_price;	}	public Food() {		super();	}	@Override	public String toString() {		return super.toString();	}}

4.MyListViewAdapter.java:

package com.example.adapter;import java.util.ArrayList;import java.util.HashMap;import com.example.info.Food;import com.example.listviewselectitem.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;public class MyListViewAdapter extends BaseAdapter {	// 填充数据的list	private ArrayList<Food> foodlist;	// 用来控制CheckBox的选中状况	private static HashMap<Integer, Boolean> isSelected;	// 上下文	private Context context;	// 用来导入布局	private LayoutInflater inflater = null;	// 构造器	public MyListViewAdapter(ArrayList<Food> list, Context context) {		this.context = context;		this.foodlist = list;		inflater = LayoutInflater.from(context);		isSelected = new HashMap<Integer, Boolean>();		// 初始化数据		initDate();	}	// 初始化isSelected的数据	private void initDate() {		for (int i = 0; i < foodlist.size(); i++) {			getIsSelected().put(i, false);		}	}	@Override	public int getCount() {		return foodlist.size();	}	@Override	public Object getItem(int position) {		return foodlist.get(position);	}	@Override	public long getItemId(int position) {		return position;	}	@Override	public View getView(int position, View convertView, ViewGroup parent) {		ViewHolder holder = null;		if (convertView == null) {			// 获得ViewHolder对象			holder = new ViewHolder();			// 导入布局并赋值给convertview			convertView = inflater.inflate(R.layout.item, null);			holder.imageView = (ImageView) convertView					.findViewById(R.id.food_imager);			holder.txt1 = (TextView) convertView.findViewById(R.id.food_name);			holder.txt2 = (TextView) convertView.findViewById(R.id.price);			holder.cb = (CheckBox) convertView.findViewById(R.id.check_box);			// 为view设置标签			convertView.setTag(holder);		} else {			// 取出holder			holder = (ViewHolder) convertView.getTag();		}		// 获取数据		Food food = foodlist.get(position);		// 将数据填充到当前convertView的对应控件中		holder.imageView.setImageResource(food.food_img);		holder.txt1.setText(food.food_name);		holder.txt2.setText(food.food_price);		// 设置list中TextView的显示		// 根据isSelected来设置checkbox的选中状况		holder.cb.setChecked(getIsSelected().get(position));		return convertView;	}	public static HashMap<Integer, Boolean> getIsSelected() {		return isSelected;	}	public static void setIsSelected(HashMap<Integer, Boolean> isSelected) {		MyListViewAdapter.isSelected = isSelected;	}	public static class ViewHolder {		public TextView txt1;		public TextView txt2;		public ImageView imageView;		public CheckBox cb;	}}

5.MainActivity.java:

package com.example.listviewselectitem;import java.util.ArrayList;import java.util.HashMap;import com.example.adapter.MyListViewAdapter;import com.example.adapter.MyListViewAdapter.ViewHolder;import com.example.info.Food;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.Window;import android.view.View.OnClickListener;import android.widget.AdapterView;import android.widget.Button;import android.widget.CheckBox;import android.widget.ListView;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class MainActivity extends Activity implements OnClickListener,		OnItemClickListener {	private ListView listView;	private Button ok;	private ArrayList<Food> foods = new ArrayList<Food>();	private MyListViewAdapter adapter;	private CheckBox checkBox;	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		requestWindowFeature(Window.FEATURE_NO_TITLE);		setContentView(R.layout.activity_main);		initView();// 初始化控件		View view=LayoutInflater.from(this).inflate(R.layout.item, null);		checkBox=(CheckBox)view.findViewById(R.id.check_box);		initData();// 初始化虚拟数据		adapter = new MyListViewAdapter(foods, getApplicationContext());		listView.setAdapter(adapter);	}	/**	 * 初始化控件	 * */	public void initView() {		listView = (ListView) findViewById(R.id.drink_list);// listview列表控件		ok = (Button) findViewById(R.id.btn_commit);// 确定按钮		ok.setOnClickListener(this);		listView.setOnItemClickListener(this);	}	/**	 * 初始化虚拟数据	 * */	public void initData() {										Class cls = R.drawable.class;//反射		try {			foods.add(new Food(cls.getDeclaredField("d1").getInt(null), "猕猴桃汁",					"10"));			foods.add(new Food(cls.getDeclaredField("d2").getInt(null), "橙汁",					"12"));			foods.add(new Food(cls.getDeclaredField("d3").getInt(null), "啤酒",					"15"));			foods.add(new Food(cls.getDeclaredField("d4").getInt(null), "葡萄汁",					"10"));			foods.add(new Food(cls.getDeclaredField("d5").getInt(null), "纯麦奶茶",					"8"));			foods.add(new Food(cls.getDeclaredField("d6").getInt(null), "薄荷汁",					"10"));			foods.add(new Food(cls.getDeclaredField("d7").getInt(null), "柠檬薄荷",					"12"));			foods.add(new Food(cls.getDeclaredField("d8").getInt(null), "椰子汁",					"10"));			foods.add(new Food(cls.getDeclaredField("d9").getInt(null), "珍珠奶茶",					"9"));			foods.add(new Food(cls.getDeclaredField("d10").getInt(null), "石榴汁",					"10"));		} catch (Exception e) {			e.printStackTrace();		}	}	/**	 * 按钮的点击事件处理	 * */	@Override	public void onClick(View v) {		int mID = v.getId();		switch (mID) {		case R.id.btn_commit:			myPrice();// 计算总价并输出			break;				}	}	/**	 * 计算总价格的方法	 * */	public void myPrice() {		HashMap<Integer, Boolean> map = MyListViewAdapter.getIsSelected();		String str = "";		int money = 0;		for (int i = 0; i < map.size(); i++) {			if (map.get(i)) {				str += (i + " ");				money += Integer.parseInt(foods.get(i).food_price);			}		}		MyListViewAdapter.getIsSelected().get("");		Toast.makeText(getApplicationContext(),				"已选中了" + str + "项,总价钱为:" + money, Toast.LENGTH_SHORT).show();	}	/**	 * listview的item的选择的方法	 * */	@Override	public void onItemClick(AdapterView<?> parent, View view, int position,			long id) {		// 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤		ViewHolder holder = (ViewHolder) view.getTag();		// 改变CheckBox的状态		holder.cb.toggle();		// 将CheckBox的选中状况记录下来		MyListViewAdapter.getIsSelected().put(position, holder.cb.isChecked());	}}

二、运行实例

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源码下载

2楼qq_260675936天前 16:20: 我觉得一进去这些个checkbox是隐藏的然后需要的时候在全部可见，还有可以增加全选和反选，还希望博主提供下思路。。。哈哈

1楼qq_150035056天前 01:50: 我不明白的是为什么getIsSelected和setIsSelected要用static修饰。麻烦解答下。