android软件开发为ListView Item中的组件添加事件以及更新数据

android 为ListView Item中的组件添加事件 以及更新数据// 部分代码如下：其中holder.count 是一个EditViewholder.price 是一个TextViewJava代码1.viewplaincopytoclipboardprint?2.@Override3.publicViewgetView(finalintposition,ViewconvertView,finalViewGroupparent){4.。

5.//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6.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7.8.然后对于每个item使用不同的监听事件即newTextWatcher()每次都创建一个新的事件监听器9.10.finalViewHolderholder=newViewHolder();11.12.holder.count.addTextChangedListener(newTextWatcher(){13......14.@Override15.publicvoidafterTextChanged(Editables){16.//holder.price是与holder.count在同一个item的view17.holder.price.setText(".......");//赋值起作用18......19.//textTotalPrice是最后一个Item中的view20.//与holder.price不是同一个item中的view21.textTotalPrice.setText("。

");//赋值无效22.//更新list23.goods.get(position).setCount(count+"");24.//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25.GoodsListAdapter.this.notifyDataSetChanged();26.});完整代码如下：Java代码1.2.viewplaincopytoclipboardprint?3.importjava.util.List;4.5.importorg.android.util.NumberUtils;6.7.importandroid.app.Activity;8.importandroid.text.Editable;9.importandroid.text.TextWatcher;10.importandroid.util.Log;youtInflater;12.importandroid.view.View;13.importandroid.view.ViewGroup;14.importandroid.widget.BaseAdapter;15.importandroid.widget.EditText;16.importandroid.widget.TextView;17.18.importcom.mmb.shop.R;19./**20.*购物车:商品列表21.*22.*@authorwangtao23.*/24.publicclassGoodsListAdapterextendsBaseAdapter{25.26.privatestaticList<Goods>goods;27.28.privateLayoutInflatermInflater;29.30.privatestaticTextViewtextTotalPrice;31.32.//privateActivitycontext;33.34.publicGoodsListAdapter(List<Goods>goods_,Activitycontext){35.goods=goods_;36.mInflater=context.getLayoutInflater();37.//this.context=context;38.}39.40.@Override41.publicViewgetView(finalintposition,ViewconvertView,finalViewGroupparent){42.//最后一条显示总价43.if(position==goods.size()){44.convertView=mInflater.inflate(yout.simple_list_item_1,parent,false);45.textTotalPrice=(TextView)convertView.findViewById(android.R.id.text1);46.if(goods.size()>0){47.textTotalPrice.setText("总价:"+calcuteTotalPrice()+"");48.}else{49.textTotalPrice.setText("购物车为空....");50.}51.returnconvertView;52.}53.54.finalViewHolderholder=newViewHolder();55.//商品列表布局56.convertView=mInflater.inflate(yout.list_item_shop_car,parent,false);57.holder.id=(TextView)convertView.findViewById(R.id.goods_id);=(TextView)convertView.findViewById(R.id.goods_name);59.//不能使用Holder模式;必须每次都创建一个不同的EditText组件60.holder.count=(EditText)convertView.findViewById(R.id.goods_count);61.//单价62.holder.singlePrice=(TextView)convertView.findViewById(R.id.goods_single_price);63.//总价64.holder.price=(TextView)convertView.findViewById(R.id.goods_price);65.66.finalGoodsitem=goods.get(position);67.//holder.id.setText(item.getId());.setText(item.getName());69.holder.count.setText(item.getCount());70.holder.singlePrice.setText(item.getSinglePrice());71.floattotalPrice=Integer.valueOf(item.getCount())*Float.valueOf(item.getSinglePrice());72.holder.price.setText("价格:"+totalPrice+"");73.//设置没类产品的总价74.goods.get(position).setTotalPrice(totalPrice+"");75.76.//添加编辑框的change事件77.holder.count.addTextChangedListener(newTextWatcher(){78.@Override79.publicvoidonTextChanged(CharSequences,intstart,intbefore,intcount){80.}81.@Override82.publicvoidbeforeTextChanged(CharSequences,intstart,intcount,83.intafter){84.}85.@Override86.publicvoidafterTextChanged(Editables){87.try{//s.toString()即是文本框的值88.intcount=Integer.valueOf(s.toString());89.floatsinglePrice=Integer.valueOf(item.getSinglePrice());90.floattotalPrice=count*singlePrice;91.holder.price.setText(totalPrice+"");92.goods.get(position).setTotalPrice(totalPrice+"");93.textTotalPrice.setText(GoodsListAdapter.calcuteTotalPrice()+"");94.goods.get(position).setCount(count+"");95.//更新数据96.GoodsListAdapter.this.notifyDataSetChanged();97.//ViewconvertView=mInflater.inflate(yout.simple_list_item_1,parent,false);98.//updateItemInTotalPrice();99.}catch(Exceptione){100.Log.e("xx",e.getStackTrace().toString());101.}102.103.}104.});105.returnconvertView;106.}107.//ViewHolder模式????108.staticclassViewHolder{109.TextViewid;//ID110.TextViewname;//名称111.EditTextcount;//数量112.TextViewsinglePrice;//单价113.TextViewprice;//单个商品的总价114.115.}116.117./**118.*计算所有购物车商品总价119.*@return120.*/121.privatefinalstaticfloatcalcuteTotalPrice(){122.floatprice=0f;123.for(Goodsgs:goods){124.price+=NumberUtils.toFloat(gs.getTotalPrice());125.}126.returnprice;127.}128.//更新购物车商品总价Item~~非全部整合ListView129.//privatefinalvoidupdateItemInTotalPrice(){130.//TextViewview=(TextView)this.getItem(goods.size());131.//view.setText("ddddddddd");132.//}133.134.@Override135.publicintgetCount(){136.returngoods.size()+1;137.}138.@Override139.publicObjectgetItem(intposition){140.returnposition;141.}142.@Override143.publiclonggetItemId(intposition){144.returnposition;145.}146.147.}。