Android实战简易教程<四十七>(ListView多选-实现点餐系统)
来源:互联网 发布:nginx conf.d配置生效 编辑:程序博客网 时间:2024/06/06 10:57
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)
[html] view plaincopy
- <span style="font-size:14px;"><?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></span>
[html] view plaincopy
- <?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>
[java] view plaincopy
- 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();
- }
- }
[java] view plaincopy
- 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;
- }
- }
[java] view plaincopy
- 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
源码下载
0 0
- Android实战简易教程<四十七>(ListView多选-实现点餐系统)
- Android实战简易教程-第四十七枪(ListView多选-实现点餐系统)
- Android实战简易教程<四十>(窃听风云之短信监听)
- Android实战简易教程<四十三>(Shell Script 运行Command)
- Android实战简易教程<七>(Activity的启动模式)
- Android实战简易教程-第十五枪(实现ListView中Button点击事件监听)
- Android实战简易教程<十五>(实现ListView中Button点击事件监听)
- Android实战简易教程-第五枪(ListView用法研究)
- Android实战简易教程<五>(ListView用法研究)
- Android实战简易教程<五十一>(ListView实现子控件的动态显示和隐藏、checkbox全选和反选)
- Android实战简易教程<三>(实现简单绘图组件)
- Android实战简易教程<十二>(ViewFlipper实现幻灯效果)
- Android实战简易教程<三十七>(ListView中点击button跳转到拨号界面实例)
- Android开发笔记(四十七)Runnable接口实现多线程
- Android实战简易教程-第五十一枪(ListView实现子控件的动态显示和隐藏、checkbox全选和反选)
- Android实战简易教程-第五十四枪(通过实现OnScrollListener接口实现下拉刷新功能)
- Android实战简易教程<五十三>(通过实现OnScrollListener接口实现上拉加载更多功能)
- Android实战简易教程<五十四>(通过实现OnScrollListener接口实现下拉刷新功能)
- 利用Java生成静态HMTL页面
- 用nginx搭建一个简单的代理服务器
- Linux命令英文全称
- Android获取手机配置信息
- 关于输出用%lf和%f的问题
- Android实战简易教程<四十七>(ListView多选-实现点餐系统)
- iOS 并发编程之 Operation Queues
- Linux目录树:根目录、典型目录等详细说明
- 关于ArrayList的5道面试题
- test7.7
- window7远程桌面部署服务器
- System.Web.Extensions, Version=1.0.61025.0, Culture=neutral
- svn提交规范
- 坑爹锦集之 maven-assembly 插件