android_checkBox的小demo_

package com.zihao.list.avtivity;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.zihao.R;
import com.zihao.list.util.Person;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

	Button showBtn;
	ListView mListView;
	List<Person> persionArr = new ArrayList<Person>();
	Context mContext;
	List<Integer> listItemID = new ArrayList<Integer>();
	MyListAdapter mAdapter;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);// 绑定布局
		mContext = getApplicationContext();// 获取上下文对象

		// 获取布局中的控件
		showBtn = (Button) findViewById(R.id.show);
		mListView = (ListView) findViewById(R.id.lvperson);

		initPersonData();
		mAdapter = new MyListAdapter(persionArr);
		mListView.setAdapter(mAdapter);

		showBtn.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {

				listItemID.clear();// 清空listItemID

				for (int i = 0; i < mAdapter.mChecked.size(); i ) {
					if (mAdapter.mChecked.get(i)) {
						listItemID.add(i);
					}
				}

				if (listItemID.size() == 0) {
					AlertDialog.Builder builder1 = new AlertDialog.Builder(
							MainActivity.this);
					builder1.setMessage("没有选中任何记录");
					builder1.show();
				} else {// 如果列表不为空,在对话框上显示选中项的ID
					StringBuilder sb = new StringBuilder();

					for (int i = 0; i < listItemID.size(); i ) {// 遍历listItemID列表取得存放的每一项
						sb.append("ItemID="  listItemID.get(i)  " . ");
					}
					AlertDialog.Builder builder2 = new AlertDialog.Builder(
							MainActivity.this);
					builder2.setMessage(sb.toString());
					builder2.show();// 显示对话框
				}
			}
		});
	}

	/**
	 * 模拟数据
	 */
	private void initPersonData() {
		Person mPerson;
		for (int i = 1; i <= 12; i ) {
			mPerson = new Person();
			mPerson.setName("Item"  i);
			mPerson.setAddress("这里是第"  i  "个选项");
			persionArr.add(mPerson);
		}
	}

	/**
	 * 自定义ListView适配器
	 */
	class MyListAdapter extends BaseAdapter {
		/** 标记CheckBox是否被选中 **/
		List<Boolean> mChecked;
		/** 存放要显示的Item数据 **/
		List<Person> listPerson;
		/** 一个HashMap对象 **/
		@SuppressLint("UseSparseArrays")
		HashMap<Integer, View> map = new HashMap<Integer, View>();

		public MyListAdapter(List<Person> list) {
			listPerson = new ArrayList<Person>();
			listPerson = list;

			mChecked = new ArrayList<Boolean>();
			for (int i = 0; i < list.size(); i ) {// 遍历且设置CheckBox默认状态为未选中
				mChecked.add(false);
			}
		}

		/**
		 * 获取总项数
		 */
		@Override
		public int getCount() {
			return listPerson.size();
		}

		/**
		 * 获取指定子项
		 */
		@Override
		public Object getItem(int position) {
			return listPerson.get(position);
		}

		/**
		 * 获取指定子项的ID
		 */
		@Override
		public long getItemId(int position) {
			return position;
		}

		/**
		 * 返回一个视图对象
		 */
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			View view;
			ViewHolder holder = null;

			if (map.get(position) == null) {// 根据position判断View是否为空
				LayoutInflater mInflater = (LayoutInflater) mContext
						.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
				view = mInflater.inflate(R.layout.listitem, null);
				// 初始化ViewHolder对象
				holder = new ViewHolder();
				holder.selected = (CheckBox) view
						.findViewById(R.id.list_select);
				holder.name = (TextView) view.findViewById(R.id.list_name);
				holder.address = (TextView) view
						.findViewById(R.id.list_address);
				final int p = position;
				map.put(position, view);// 存储视图信息
				holder.selected.setOnClickListener(new View.OnClickListener() {

					@Override
					public void onClick(View v) {
						CheckBox cb = (CheckBox) v;
						mChecked.set(p, cb.isChecked());// 设置CheckBox为选中状态
					}
				});
				view.setTag(holder);
			} else {
				view = map.get(position);
				holder = (ViewHolder) view.getTag();
			}

			holder.selected.setChecked(mChecked.get(position));
			holder.name.setText(listPerson.get(position).getName());
			holder.address.setText(listPerson.get(position).getAddress());

			return view;
		}

	}

	/**
	 * 常量类
	 */
	static class ViewHolder {
		CheckBox selected;
		TextView name;
		TextView address;
	}
}