checkbox的单选全选，反选，计算价格，删除

时间：2021-03-07 16:17:21

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

  <LinearLayout

      android:layout_width="match_parent"

      android:layout_height="wrap_content"

      >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="全选"

        android:layout_weight="1"

        />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="反 选"

         android:layout_weight="1"

        />

    <Button

        android:id="@+id/button3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="全不选"

         android:layout_weight="1"

        />

    <Button

        android:id="@+id/button4"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="删除"

         android:layout_weight="1"

        />

</LinearLayout>

<TextView

    android:id="@+id/price"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    />

<ListView

    android:id="@+id/listveiw"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    ></ListView>

</LinearLayout>

　

listveiw.xml

如果ListView的Item中包含CheckBox，由于CheckBox的焦点优先级高于ListView，所以当选中ListView时，ListView将不会有选中的状态，解决的方法就是在checkbox组件中加一属性：android:focusable="false"

　

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

   <TextView

       android:id="@+id/text"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

       android:text="ddd"

       />

   <CheckBox

       android:id="@+id/checkbox"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content"

        android:focusable="false"

        android:clickable="false"

       android:layout_alignParentRight="true"

       android:layout_alignParentTop="true" />

</RelativeLayout>

　　MainActivity.java

package com.bawei.day04_listview;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import com.bawei.day04_listview.Adper.ViewHolder;

import com.bawei.vo.Good;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.TextView;

public class MainActivity extends Activity {

    private Button button1;

    private Button button2;

    private Button button3;

    private ListView listView;

    private List<Good> list;

    private TextView price;

    private int num=0;

    private int pric=0;

    private BaseAdapter adapter;

    private Button button4;

    private List<Good> li;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button1 = (Button) findViewById(R.id.button1);//全选

        button2 = (Button) findViewById(R.id.button2);//反选

        button3 = (Button) findViewById(R.id.button3);//全不选

        button4 = (Button) findViewById(R.id.button4);//删除

        listView = (ListView) findViewById(R.id.listveiw);//价格

        price = (TextView) findViewById(R.id.price);

        list = new ArrayList<Good>();

        //赋值

        for (int i = 0; i < 60; i++) {

            list.add(new Good(i+"", false));

        }

        //适配

        adapter = new Adper(list,MainActivity.this);

        listView.setAdapter(adapter);

        //全选

        button1.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                // TODO Auto-generated method stub

                num = 0;

                 pric = 0;

                for (int i = 0; i < list.size(); i++) {

                    //改变boolean

                    list.get(i).setBo(true);

                    //如果为选中

                         if(list.get(i).getBo()){

                         num++;

                         pric+=Integer.parseInt(list.get(i).getName());

                    }

                }

                //刷新

                adapter.notifyDataSetChanged();

                //显示

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });

        //反选

        button2.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                // TODO Auto-generated method stub

                num = 0;

                 pric = 0;

                for (int i = 0; i < list.size(); i++) {

                    //改值

                    if(list.get(i).getBo()){

                        list.get(i).setBo(false);

                    }else{

                        list.get(i).setBo(true);

                    }

                    //刷新

                    adapter.notifyDataSetChanged();

                    //如果为选中

                    if(list.get(i).getBo()){

                         num++;

                         pric+=Integer.parseInt(list.get(i).getName());

                    }

                }

                // 用TextView显示

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });

        //全不选

        button3.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                // TODO Auto-generated method stub

                 num = 0;

                 pric = 0;

                for (int i = 0; i < list.size(); i++) {

                    //改值

                    list.get(i).setBo(false);

                    //刷新

                    adapter.notifyDataSetChanged();

                    //如果为选中

                    if(list.get(i).getBo()){

                         num++;

                         pric+=Integer.parseInt(list.get(i).getName());

                    } 

                }

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });

        //删除1

        /*li = new ArrayList<Good>();

        button4.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                // TODO Auto-generated method stub

                for (int i = 0; i < list.size(); i++) {

                    if(list.get(i).getBo()){

                        //把要删除的保存起来

                    li.add(list.get(i));

                    }

                }

                //删除

                list.removeAll(li);

                adapter.notifyDataSetChanged();

                 num = 0;

                 pric = 0;

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });*/

        //删除2

        button4.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                // TODO Auto-generated method stub

                //获取list集合对应的迭代器

                Iterator it=list.iterator();

                while (it.hasNext()) {

                    //得到对应集合元素

                    Good g=(Good) it.next();

                    //判断

                    if(g.getBo()){

                        //从集合中删除上一次next方法返回的元素

                        it.remove();

                    }

                }

                //刷新

                adapter.notifyDataSetChanged();

                 num = 0;

                 pric = 0;

                 //显示

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });

        // 绑定listView的监听器

        listView.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

                    long arg3) {

                // TODO Auto-generated method stub

                 // 取得ViewHolder对象

                ViewHolder viewHolder = (ViewHolder) arg1.getTag();

                 // 改变CheckBox的状态

                viewHolder.checkBox.toggle();

                 // 将CheckBox的选中状况记录下来

                list.get(arg2).setBo(viewHolder.checkBox.isChecked());

                 // 调整选定条目

                if (viewHolder.checkBox.isChecked() == true) {

                    num++;

                    pric+=Integer.parseInt(list.get(arg2).getName());

                } else {

                    num--;

                    pric-=Integer.parseInt(list.get(arg2).getName());

                }

                // 用TextView显示

                price.setText("一共选了"+num+"件,"+"价格是"+pric+"元");

            }

        });

    }

}

　　List的Vo类Good.java

package com.bawei.vo;

public class Good {

private String name;

private boolean bo;

public String getName() {

    return name;

}

public void setName(String name) {

    this.name = name;

}

public boolean getBo() {

    return bo;

}

public void setBo(boolean bo) {

    this.bo = bo;

}

@Override

public String toString() {

    return "Good [name=" + name + ", bo=" + bo + "]";

}

public Good(String name, boolean bo) {

    super();

    this.name = name;

    this.bo = bo;

}

public Good() {

    super();

}

}

　　适配Adper.java

package com.bawei.day04_listview;

import java.util.List;

import com.bawei.vo.Good;

import android.content.Context;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.CheckBox;

import android.widget.CompoundButton;

import android.widget.CompoundButton.OnCheckedChangeListener;

import android.widget.TextView;

public class Adper extends BaseAdapter {

    List<Good> list;

    Context context;

    public Adper(List<Good> list, Context context) {

        // TODO Auto-generated constructor stub

    this.list=list;

    this.context=context;

    }

    public int getCount() {

        // TODO Auto-generated method stub

        return list.size();

    }

    public Object getItem(int position) {

        // TODO Auto-generated method stub

        return null;

    }

    public long getItemId(int position) {

        // TODO Auto-generated method stub

        return 0;

    }

    public View getView(final int position, View convertView, ViewGroup parent) {

        // TODO Auto-generated method stub

        final ViewHolder viewHolder;

        if(convertView==null){

            convertView=View.inflate(context, R.layout.listveiw, null);

         viewHolder=new ViewHolder();

         viewHolder.textView=(TextView) convertView.findViewById(R.id.text);

        viewHolder.checkBox=(CheckBox) convertView.findViewById(R.id.checkbox);

        convertView.setTag(viewHolder);

        }else{

            viewHolder=(ViewHolder) convertView.getTag();

        }

        viewHolder.textView.setText("价格："+list.get(position).getName());

        //显示checkBox

        viewHolder.checkBox.setChecked(list.get(position).getBo());

        return convertView;

    }

class ViewHolder{

    TextView textView;

    CheckBox checkBox;

}

}

　　

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