Question

我将最少十种食物送入Listview。

我想选择一种或多种食物。

按下订单按钮。

然后显示精选食品的总价格。

请告诉我怎么可能？

MenuListItem：

package com.example.project_hotel_management;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

public class MenuListItem extends Activity{

    ListView lv;
    MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
    setContentView(R.layout.menuitemlist_layout);

    lv=(ListView)findViewById(R.id.listView1);

    adapter=new MyAdapter(this , getListItem());
    lv.setAdapter(adapter);

    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplicationContext(), "d", Toast.LENGTH_LONG).show();

        }
    });
    }

    public ArrayList<ListItem> getListItem() {
        ArrayList<ListItem> alllist=new ArrayList<ListItem>();

        ListItem l1=new ListItem("beef_burguer", 1, R.drawable.beef_burguer);
        ListItem l2=new ListItem("bacon_cheese_burger", 2, R.drawable.bacon_cheese_burger);
        ListItem l3=new ListItem("frings", 3, R.drawable.frings);
        ListItem l4=new ListItem("burger_kingse", 4, R.drawable.burger_kingse);
        ListItem l5=new ListItem("mint_oreo", 5, R.drawable.mint_oreo);
        ListItem l6=new ListItem("sourdough_bread", 6, R.drawable.sourdough_bread);
        ListItem l7=new ListItem("sandwich", 7, R.drawable.sandwich);
        ListItem l8=new ListItem("sandwich_loaded", 8, R.drawable.sandwich_loaded);
        ListItem l9=new ListItem("mustard", 9, R.drawable.mustard);
        ListItem l10=new ListItem("cheese_burger", 10, R.drawable.cheese_burger);

        alllist.add(l1);
        alllist.add(l2);
        alllist.add(l3);
        alllist.add(l4);
        alllist.add(l5);
        alllist.add(l6);
        alllist.add(l7);
        alllist.add(l8);
        alllist.add(l9);
        alllist.add(l10);



        return alllist;
    }

    public void order(View v) {

        String result="";
        List<Integer> resultList=adapter.getCheckedItemPosition();
        for (int i = 0; i < resultList.size(); i++) {
            result+=String.valueOf(resultList.get(i))+"\n";
        }
        Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();

    }

}

MyAdapter：

package com.example.project_hotel_management;

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

import android.app.Activity;
import android.content.ClipData.Item;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class MyAdapter extends ArrayAdapter<ListItem>{

    Activity context;
    ArrayList<ListItem> listItem;

    HashMap<Integer, Boolean> myChecked=new HashMap<Integer, Boolean>();

    public MyAdapter(Activity context, ArrayList<ListItem> listItem) {
        super(context, R.layout.adapter_layout, listItem);
         this.context=context;
         this.listItem=listItem;

       for (int i = 0; i < listItem.size(); i++) {
        myChecked.put(i, false);
    }

    }


    public void toggleChecked(int position) {
        if(myChecked.get(position)){
            myChecked.put(position, false);
            Toast.makeText(getContext(), "false", Toast.LENGTH_LONG).show();
        }else{
            myChecked.put(position, true);
            Toast.makeText(getContext(), "false", Toast.LENGTH_LONG).show();
        }
        notifyDataSetChanged();
    }

    public List<Integer> getCheckedItemPosition() {
        List<Integer> checkedItemPosition=new ArrayList<Integer>();

        for (int i = 0; i < myChecked.size(); i++) {
            checkedItemPosition.add(i);
        }
        return checkedItemPosition;
    }

//  public List<Integer> getCheckedItem() {
//      List<Integer> checkedItem=new ArrayList<Integer>();
//      
//      for (int i = 0; i < myChecked.size(); i++) {
//          checkedItem.add();
//      }
//      return checkedItem;
//  }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view=convertView;

            LayoutInflater inflat=context.getLayoutInflater();
            view=inflat.inflate(R.layout.adapter_layout, null, false);
            TextView txtName=(TextView) view.findViewById(R.id.txtName);
            TextView txtPrice=(TextView) view.findViewById(R.id.txtPrice);
            ImageView image=(ImageView) view.findViewById(R.id.imageView1);

            ListItem l=listItem.get(position);
            Toast.makeText(getContext(), String.valueOf(listItem.get(position)), Toast.LENGTH_LONG
             ).show();

            txtName.setText(l.getName());
            txtPrice.setText(String.valueOf(l.getPrice()));
            image.setImageResource(l.getImage());

            CheckBox chekboxs=(CheckBox) view.findViewById(R.id.checkBox1);

            Boolean chekBox=myChecked.get(position);

            if(chekBox!=null){
                chekboxs.setChecked(chekBox);
            }


        return view;
    }
}

列表项：

package com.example.project_hotel_management;

public class ListItem {

    String name;
    Integer price;
    Integer image;



    public ListItem(String name, Integer price, Integer image) {
        super();
        this.name = name;
        this.price = price;
        this.image = image;
    }


    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getPrice() {
        return price;
    }
    public void setPrice(Integer price) {
        this.price = price;
    }
    public Integer getImage() {
        return image;
    }
    public void setImage(Integer image) {
        image = image;
    }
    @Override
    public String toString() {
        return "ListItem [name=" + name + ", price=" + price + ", Image="
                + image + "]";
    }
}

我使用它但它不起作用：

lv.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
        long arg3) {
    // TODO Auto-generated method stub
    ListItem ls=getListItem().get(position);
    Toast.makeText(getApplicationContext(), String.valueOf(ls.getPrice()), Toast.LENGTH_LONG).show();


}


});

Answer 1

您只需在列表视图中设置android:choiceMode="multipleChoice"即可。您还可以实现选择器以定义如何突出显示所选项目。选择器的一个例子：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/list_item_bg_normal" android:state_activated="false"/>
    <item android:drawable="@drawable/list_item_bg_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/list_item_bg_pressed" android:state_activated="true"/>

</selector>

选择ListView中的一个或多个项目后，您可以通过以下方式获取所选项目：

int len = listView.getCount();
SparseBooleanArray checked = listView.getCheckedItemPositions();
for (int i = 0; i < len; i++)
if (checked.get(i)) {
String item = cont_list.get(i);
/* calculate the price  */
}

Answer 2

您可以使用自定义列表视图为列表视图中的每个项目添加复选框。在按钮点击事件上，您可以遍历列表以识别已选择的项目并计算总金额。

Android列表视图选择项目

MenuListItem：

MyAdapter：

列表项：

2 个答案: