全选和反选

//--------------主布局文件----------------------------

//--------------listview 条目的布局--------------------

<?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="horizontal" >

    <CheckBox
        android:id="@+id/ck"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
   <TextView
        android:id="@+id/tv"
        android:textSize="18sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

//------------MainActivity中-----------------------

package com.bwie.test;

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

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
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.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private ListView list_view;
   private CheckBox allBox;
   private Button reverse;
   private CheckAdapter checkAdapter;

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找到控件
        list_view = (ListView) findViewById(R.id.list_view);
        allBox = (CheckBox) findViewById(R.id.all);
        reverse = (Button) findViewById(R.id.reverse);

        //初始化数据
        List<String> list=new ArrayList<String>();
        for (int i = 0; i < 15; i++) {
           list.add("这是条目"+i);
       }

        //设置适配器
        checkAdapter = new CheckAdapter(list, this);
        list_view.setAdapter(checkAdapter);

        //设置全选
        allBox.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
               //记录选中状态
               boolean flag=allBox.isChecked();
               //遍历，把全选框的状态给每个条目
               for (int i = 0; i < checkAdapter.getSelect().size(); i++) {

                   checkAdapter.getSelect().set(i, flag);
               }
               //刷新适配器
               checkAdapter.notifyDataSetChanged();

           }
       });

        //设置反选
        reverse.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
               //如果不包含选中的，也就是条目一个也没选中,就吐司，否则反选
               if (!checkAdapter.getSelect().contains(true)) {
                   Toast.makeText(MainActivity.this, "请选择", 0).show();
               }else{
                   //遍历，把选中的设置未选中
                   for (int i = 0; i < checkAdapter.getSelect().size(); i++) {
                       if (checkAdapter.getSelect().get(i)) {
                           checkAdapter.getSelect().set(i, false);
                       }else{
                           //把为选中的设置为选中
                           checkAdapter.getSelect().set(i, true);
                       }
                   }
                   //判断如果包含未选中的，全选框设置为未选中
                   if (checkAdapter.getSelect().contains(false)) {
                       allBox.setChecked(false);
                   }
                   //刷新适配器
                   checkAdapter.notifyDataSetChanged();
               }

           }
       });
    }


   //适配器用的内部类
   private class CheckAdapter extends BaseAdapter{
       private List<String> list;
       private Context context;
       //创建一个集合去记录选中与未选中的状态
       LinkedList<Boolean> linkedList=new LinkedList<Boolean>();


       public CheckAdapter(List<String> list, Context context) {
           super();
           this.list = list;
           this.context = context;

           //设置默认值为不选中
           for (int i = 0; i < list.size(); i++) {
               linkedList.add(false);
           }
       }
       //对外提供一个方法获取这个集合
       private List<Boolean> getSelect(){

           return linkedList;
       }

       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           return list.size();
       }

       @Override
       public Object getItem(int position) {
           // TODO Auto-generated method stub
           return list.get(position);
       }

       @Override
       public long getItemId(int position) {
           // TODO Auto-generated method stub
           return position;
       }

       @Override
       public View getView(final int position, View convertView, ViewGroup parent) {
           if (convertView==null) {
               convertView=View.inflate(context, R.layout.item, null);

           }
           CheckBox ck=(CheckBox) convertView.findViewById(R.id.ck);
           TextView tView=(TextView) convertView.findViewById(R.id.tv);
           tView.setText(list.get(position));
           ck.setChecked(linkedList.get(position));
           //对checkBox点击进行监听
           ck.setOnClickListener(new OnClickListener() {

               @Override
               public void onClick(View v) {
                   //点中的时候改成相反的值
                   linkedList.set(position, !linkedList.get(position));
                   //点击的同时还要去判断全选       包含false
                   if (linkedList.contains(false)) {
                       allBox.setChecked(false);
                   }else{
                       allBox.setChecked(true);
                   }
                   notifyDataSetChanged();
               }
           });
           return convertView;
       }

   }



}

posted on 2016-10-07 20:24 巫山老妖阅读(142) 评论(0) 编辑收藏举报