购物车的实现

来源：互联网发布：mac air 鼠标不停晃动编辑：程序博客网时间：2024/04/27 22:47

private LinkedList<Boolean> listbool=new LinkedList<Boolean>();
   private List<SQLBean> list;
   private CartAdapter cart;
   private CheckBox checkall;
   private TextView tvall;

private double sum=0;

   checkall.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
               boolean flag=checkall.isChecked();
               sum=0;
               for (int i = 0; i <cart.getSelect().size(); i++) {
                   listbool.set(i, flag);
                   if(flag==false){
                       sum=0;
                       DecimalFormat format=new DecimalFormat("###.00");
                       tvall.setText( ""+ format.format(sum));
                   }else{
                       sum=sum+list.get(i).getPrice()*list.get(i).getCount();
                       DecimalFormat format=new DecimalFormat("###.00");
                       tvall.setText( ""+ format.format(sum));
                   }
               }
               cart.notifyDataSetChanged();

}

class CartAdapter extends BaseAdapter {


       public CartAdapter() {
           for(int i=0;i<list.size();i++){
               listbool.add(false);
           }
       }
       public LinkedList<Boolean> getSelect(){
           return listbool;
       }

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

       @Override
       public Object 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) {
           final ViewHoder vh;
           if (convertView == null) {
               vh = new ViewHoder();
               convertView = View.inflate(getActivity(), R.layout.cart_item, null);
               vh.che = (CheckBox) convertView.findViewById(R.id.checkBox_a);
               vh.img = (ImageView) convertView.findViewById(R.id.image_cart_);
               vh.tvN = (TextView) convertView.findViewById(R.id.tv_cart_goods_name);
               vh.tvC = (TextView) convertView.findViewById(R.id.tv_cart_count);
               vh.tvP = (TextView) convertView.findViewById(R.id.tv_cart_price);
               convertView.setTag(vh);
           } else {
               vh = (ViewHoder) convertView.getTag();
           }
           ImageLoader.getInstance().displayImage(list.get(position).getPath(), vh.img);
           vh.tvC.setText("数量:" + list.get(position).getCount() + "");
           vh.tvN.setText(list.get(position).getName() + "");
           vh.tvP.setText("￥" + list.get(position).getPrice() + "");
           vh.che.setChecked(listbool.get(position));
           vh.che.setOnClickListener(new OnClickListener() {

               @Override
               public void onClick(View v) {
                   if(vh.che.isChecked()==false){
                       //点中的时候改成相反的值
                   listbool.set(position, ! listbool.get(position));
                   sum=sum-list.get(position).getPrice()*list.get(position).getCount();
                   DecimalFormat format=new DecimalFormat("###.00");
                   tvall.setText( ""+ format.format(sum));
                   }else{
                       //点中的时候改成相反的值
                       listbool.set(position, ! listbool.get(position));
                       sum=sum+list.get(position).getPrice()*list.get(position).getCount();
                       DecimalFormat format=new DecimalFormat("###.00");
                       tvall.setText( ""+ format.format(sum));
                   }
                   if(listbool.contains(false)){
                       checkall.setChecked(false);
                   }else{
                       checkall.setChecked(true);

                   }
                   notifyDataSetChanged();
               }
           });
           return convertView;
       }

       class ViewHoder {
           ImageView img;
           CheckBox che;
           TextView tvN, tvP, tvC;
       }
   }

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