CheckBox在ListView中的数据错乱

　　在ListView中，一般我们都会使用convertView参数，来滑动过程中，复用convertView对象来优化listView。但是如果在ListView中使用了CheckBox对象，就会出现数据错乱。比如我勾选了第一个item的CheckBox，往下滑动也会出现勾选的CheckBox。当然有些人说不优化，没次执行getView都创建一个view对象。但是那是非常不可取的，如果数据大的话，是非常要命的。本项目在实现优化的情况下，解决了CheckBox在ListView中的数据错乱，大家可以参考一下。也欢迎大家提供宝贵的意见。

 

 

activity_main.xml布局：

 

<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"
        android:orientation="horizontal"
        >
        <CheckBox 
            android:id="@+id/cb_all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <Button
            android:id="@+id/btn_del_checked" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/btn_del_checked"
            />
    </LinearLayout>
    <ListView 
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:id="@+id/lv_checkbox"
        />
</LinearLayout>

activity_main_item.xml 布局：

<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="wrap_content"
    android:gravity="left"
    android:orientation="horizontal">
    <CheckBox 
        android:id="@+id/item_ck"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
    <TextView 
        android:id="@+id/item_tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

Persons.java文件

package com.datian.andoridlistcheck.entity;


public class Person {

    private String name;
    private boolean isChecked;
    
    public Person(String name, boolean isChecked) {
        super();
        this.name = name;
        this.isChecked = isChecked;
    }

    public Person() {
        super();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean isChecked) {
        this.isChecked = isChecked;
    }
    
    
}

MainActivity.java 文件

package com.datian.andoridlistcheck;

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

import com.datian.andoridlistcheck.adpter.CheckBoxAdpter;
import com.datian.andoridlistcheck.entity.Person;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;

public class MainActivity extends Activity implements OnClickListener {

    private Context context = this;
    private List<Person> persons;
    private ListView lv_checkbox;
    private CheckBox cb_all;
    
    private CheckBoxAdpter checkBoxAdpter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initData();
        initWidget();
    }

    /**
     * 初始化控件
     */
    private void initWidget() {
        cb_all = (CheckBox) this.findViewById(R.id.cb_all);
        cb_all.setOnClickListener(this);
        
        
        checkBoxAdpter = new CheckBoxAdpter(context, persons,cb_all);
        lv_checkbox = (ListView) this.findViewById(R.id.lv_checkbox);
        lv_checkbox.setAdapter(checkBoxAdpter);

        
        Button btn_del_checked = (Button) this
                .findViewById(R.id.btn_del_checked);
        btn_del_checked.setOnClickListener(this);
    }

    /**
     * 初始化数据
     */
    private void initData() {
        persons = new ArrayList<Person>();
        for (int i = 0; i < 20; i++) {
            persons.add(new Person("位置" + i, false));
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_del_checked: // 删除选中
             List<Person> checkedPersons = checkBoxAdpter.getCheckedPersons();
             for(int i = 0;i <checkedPersons.size();i++){
                 persons.remove(checkedPersons.get(i));
             }
            checkBoxAdpter.notifyDataSetChanged();
            break;
        case R.id.cb_all: // 全选或全不选
            boolean isChecked = cb_all.isChecked();
            for (int i = 0; i < persons.size(); i++) {
                persons.get(i).setChecked(isChecked);
            }
            checkBoxAdpter.notifyDataSetChanged();
            break;
        }
    }
}

CheckBoxAdpter.java文件 适配器。

package com.datian.andoridlistcheck.adpter;

import java.util.ArrayList;
import java.util.List;
import com.datian.andoridlistcheck.R;
import com.datian.andoridlistcheck.entity.Person;

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.CompoundButton;
import android.widget.TextView;

/**
 * @author datian
 */
public class CheckBoxAdpter extends BaseAdapter {

    private LayoutInflater inflater;
    private List<Person> persons;
    private CheckBox cb_all;
    public CheckBoxAdpter(Context context, List<Person> persons, CheckBox cb_all) {
        this.inflater = LayoutInflater.from(context);
        this.persons = persons;
        this.cb_all = cb_all;
    }

    @Override
    public int getCount() {
        return persons.size();
    }

    @Override
    public Object getItem(int position) {
        return persons.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final int pos = position;
        HanlderView hanlderView = null;
        if(convertView==null){
            hanlderView = new HanlderView();
            convertView = inflater.inflate(R.layout.activity_main_item, null);
            hanlderView.item_ck = (CheckBox) convertView.findViewById(R.id.item_ck);
            hanlderView.item_tv_name = (TextView) convertView.findViewById(R.id.item_tv_name);
            convertView.setTag(hanlderView);
        }else{
            hanlderView = (HanlderView) convertView.getTag();
        }
        
        hanlderView.item_ck.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                persons.get(pos).setChecked(isChecked);
                System.out.println("listener------"+persons.get(pos).getName()+":"+isChecked);
                if(isCheckedAll()){
                    cb_all.setChecked(true);
                }else{
                    cb_all.setChecked(false);
                }
            }
        });
        
        hanlderView.item_ck.setChecked(persons.get(pos).isChecked());
        System.out.println("list----"+pos+"："+persons.get(pos).isChecked());
        hanlderView.item_tv_name.setText(persons.get(position).getName());
        return convertView;
    }

    /**
     * 获取被选中
     * @return 被选中的集合list
     */
    public List<Person> getCheckedPersons(){
        List<Person> checkedPersons = new ArrayList<Person>();
        for(int i = 0;i<persons.size();i++){
            if(persons.get(i).isChecked()){
                checkedPersons.add(persons.get(i));
            }
        }
        return checkedPersons;
    }
    
    /**
     * 判断是否全部选中
     * @return
     */
    private boolean isCheckedAll(){
        boolean flag = true;
        for(int i = 0;i < persons.size();i++){
            if(!persons.get(i).isChecked()){
                flag = false;
                break;
            }
        }
        return flag;
    }
    
    private class HanlderView{
        public CheckBox item_ck;
        public TextView item_tv_name;
    }
}

 hanlderView.item_ck.setChecked(persons.get(pos).isChecked());这行必须要在setOnCheckedChangeListener监听的后面才行。