android 为 ListView Item中的组件添加事件 以及更新数据

@Override
	public View getView(final int position,View convertView,final ViewGroup parent) {
。。。。。。
// 注意该方法中的Item组件不能使用holder模式，如果用该模式， 所有的组件将共享item中view的事件
导致监听不到指定item中的view的事件，解决办法就是每次创建一个Item中的组件

然后对于每个item 使用不同的监听事件 即 new TextWatcher() 每次都创建一个新的事件监听器

final ViewHolder holder = new ViewHolder();

holder.count.addTextChangedListener( new TextWatcher() {
			.....
	@Override
	public void afterTextChanged(Editable s) {
	//holder.price 是与holder.count在同一个item的view				
holder.price.setText("......."); //赋值起作用
         .....
        //textTotalPrice是最后一个Item中的view
        //与holder.price 不是同一个item中的view
	textTotalPrice.setText("。。。。");//赋值无效
         // 更新list
	goods.get(position).setCount(count+"");
	//更新数据：条用该方法的以后， 会重新执行getView方法，非局部跟新
	GoodsListAdapter.this.notifyDataSetChanged();
});

import java.util.List;

import org.android.util.NumberUtils;

import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;

import com.mmb.shop.R;
/**
 * 购物车:商品列表
 * 
 * @author wangtao
 */
public class GoodsListAdapter extends BaseAdapter {
	
	private static List<Goods> goods;

	private LayoutInflater mInflater;
	
	private static TextView textTotalPrice;
	
//	private Activity context;
	
	public GoodsListAdapter(List<Goods> goods_, Activity context) {
		goods = goods_;
		mInflater = context.getLayoutInflater();
//		this.context = context;
	}

	@Override
	public View getView(final int position,View convertView,final ViewGroup parent) {
		//最后一条显示总价
		if(position == goods.size()){
			convertView = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false);
			textTotalPrice = (TextView) convertView.findViewById(android.R.id.text1);
			if(goods.size() > 0){
				textTotalPrice.setText("总价: "+calcuteTotalPrice()+"");
			}else{
				textTotalPrice.setText("购物车为空....");
			}
			return convertView;
		}
		
		final ViewHolder holder = new ViewHolder();
		//商品列表布局
		convertView = mInflater.inflate(R.layout.list_item_shop_car, parent, false);
		holder.id = (TextView) convertView.findViewById(R.id.goods_id);
		holder.name = (TextView) convertView.findViewById(R.id.goods_name);
		//不能使用Holder模式; 必须每次都创建一个不同的EditText组件
		holder.count = (EditText) convertView.findViewById(R.id.goods_count);
		//单价
		holder.singlePrice = (TextView) convertView.findViewById(R.id.goods_single_price);
		//总价
		holder.price = (TextView) convertView.findViewById(R.id.goods_price);
		
		final Goods item = goods.get(position);
		//holder.id.setText(item.getId());
		holder.name.setText(item.getName());
		holder.count.setText(item.getCount());
		holder.singlePrice.setText(item.getSinglePrice());
		float totalPrice = Integer.valueOf(item.getCount()) * Float.valueOf(item.getSinglePrice());
		holder.price.setText("价格: " + totalPrice + "");
		//设置没类产品的总价
		goods.get(position).setTotalPrice(totalPrice + "");
		
		//添加编辑框的change事件
		holder.count.addTextChangedListener( new TextWatcher() {
			@Override
			public void onTextChanged(CharSequence s, int start, int before, int count) {
			}
			@Override
			public void beforeTextChanged(CharSequence s, int start, int count,
					int after) {
			}
			@Override
			public void afterTextChanged(Editable s) {
				try{//s.toString() 即是 文本框的值
					int count = Integer.valueOf(s.toString());
					float singlePrice = Integer.valueOf(item.getSinglePrice());
					float totalPrice = count * singlePrice;
					holder.price.setText(totalPrice + "");
					goods.get(position).setTotalPrice(totalPrice + "");
					textTotalPrice.setText(GoodsListAdapter.calcuteTotalPrice()+"");
					goods.get(position).setCount(count+"");
					//更新数据
					GoodsListAdapter.this.notifyDataSetChanged();
					//View convertView = mInflater.inflate(android.R.layout.simple_list_item_1, parent, false);
					//updateItemInTotalPrice();
				}catch(Exception e){
					Log.e("xx", e.getStackTrace().toString());
				}
				
			}
		});
		return convertView;
	}
	// ViewHolder模式????
	static class ViewHolder {
		TextView id; 	// ID
		TextView name;	// 名称
		EditText count;	// 数量
		TextView singlePrice;//单价
		TextView price;	// 单个商品的总价
		
	}
	
	/**
	 * 计算所有购物车商品总价
	 * @return
	 */
	private final static float calcuteTotalPrice(){
		float price = 0f;
		for(Goods gs : goods){
			price += NumberUtils.toFloat(gs.getTotalPrice());
		}
		return price;
	}
	//更新购物车商品总价Item ~~ 非全部整合ListView
//	private final void updateItemInTotalPrice(){
//		TextView view = (TextView) this.getItem(goods.size());
//		view.setText("ddddddddd");
//	}
	
	@Override
	public int getCount() {
		return goods.size() + 1;
	}
	@Override
	public Object getItem(int position) {
		return position;
	}
	@Override
	public long getItemId(int position) {
		return position;
	}

}