android listview + checkbox 列表上下滑动导致复选框状态丢失解决办法

以前为这个问题头疼很久.然后去忙其他事情.一直没有去整理,今天好不容易闲下来.就来整整这个listview + checkbox的问题吧

界面:

listview_cell:

界面很简单,一个全屏的listview,cell很简单,一个textview一个checkbox

activity:

package com.example.testlistviewandcheckbox;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Adapter;
import android.widget.ListView;

public class MainActivity extends Activity {

	private Context context;
	private ListView myListView;
	private List<String> list;
	private MyAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initView();
	}
	private void initView() {
		context = this;
		myListView = (ListView) findViewById(R.id.lv_test);
		list = new ArrayList<String>();
		for(int i=0;i<20;i++) {
			list.add("this is a title of:"+i);
		}

		adapter = new MyAdapter(context, list);
		myListView.setAdapter(adapter);

	}

}

adapter:

package com.example.testlistviewandcheckbox;

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

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter {

	private Context context;
	private List<String> list;
	private HashMap<Integer, Boolean> tempMap;
	public MyAdapter(Context context,List<String> list) {
		this.context = context;
		this.list = list;
		tempMap = new HashMap<Integer,Boolean>();
		for(int i=0;i<list.size();i++) {//初始化数据,刚进来的话把每一个都置为false
			tempMap.put(i, false);		//如果不初始化会报空指针的,毕竟你还没存东西就要取了撒
		}
	}

	@Override
	public int getCount() {
		return list==null?0:list.size();
	}

	@Override
	public String getItem(int position) {
		return list.get(position);
	}

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

	@Override
	public View getView(final int position, View convertView, ViewGroup parent) {
		if(convertView==null) {
			viewHolder = new ViewHolder();
			convertView = View.inflate(context, R.layout.listview_cell, null);
			viewHolder.tv_title = (TextView) convertView.findViewById(R.id.tv_title);
			viewHolder.cb_test = (CheckBox) convertView
					.findViewById(R.id.cb_test);
			convertView.setTag(viewHolder);
		} else {
			viewHolder = (ViewHolder) convertView.getTag();
		}

		viewHolder.tv_title.setText(getItem(position));

		//为checkbox添加复选监听,把当前位置的checkbox的状态存进一个HashMap里面
		viewHolder.cb_test.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
					tempMap.put(position, isChecked);//把当前位置的状态给存储起来
			}
		});
		//从hashmap里面取出我们的状态值,然后赋值给listview对应位置的checkbox
		viewHolder.cb_test.setChecked(tempMap.get(position));

		return convertView;
	}

	private ViewHolder viewHolder;
	public class ViewHolder{
		public TextView tv_title;
		public CheckBox cb_test;
	}

}

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