Question

我尝试使用ListView内的按钮删除ArrayAdapter中显示的项目。我在getPosition中看到了ArrayAdapter方法，它返回了项目的索引号，但我不知道在ArrayAdapter的remove方法中使用它。我怎样才能做到这一点？需要帮助。

arrayAdapter

public class myOrderAdapter extends ArrayAdapter<myOrder> {


ArrayList<myOrder> list;

    public class ViewHolder{
        TextView tableNum;
        TextView itemName;
        TextView itemQuantity;
        TextView custName;
        Button btnStatus;
    }

    public myOrderAdapter(Context context, ArrayList<myOrder> orderList) {
        super(context, 0,orderList);
        this.list = orderList;
    }

    @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            final myOrder orderList = getItem(position);

            ViewHolder viewHolder;
            viewHolder = new ViewHolder();
            if(convertView == null){


                convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_layout,parent,false);

                viewHolder.tableNum = (TextView)convertView.findViewById(R.id.tableNum);
                viewHolder.itemName = (TextView)convertView.findViewById(R.id.itemName);
                viewHolder.custName = (TextView)convertView.findViewById(R.id.custName);
                viewHolder.itemQuantity = (TextView)convertView.findViewById(R.id.itemQuantity);
                viewHolder.btnStatus = (Button)convertView.findViewById(R.id.statusButton);

                convertView.setTag(viewHolder);
            }

            else {
                viewHolder = (ViewHolder)convertView.getTag();
            }


            viewHolder.tableNum.setText("Order for Table: "+orderList.getTable_id());
            viewHolder.itemName.setText(orderList.getItem_name());
            viewHolder.custName.setText("Customer Name: " + orderList.getCust_name());
            viewHolder.itemQuantity.setText("QTY: " + orderList.getQuantity());


            if(orderList.getStatus_id() == 1){
                viewHolder.btnStatus.setText("Ready");
                viewHolder.btnStatus.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Toast.makeText(getContext(),"" + getPosition(orderList),Toast.LENGTH_SHORT).show();
                                // Remove item codes here..
                                list.remove(position);

                    }
                });
                notifyDataSetChanged();
            }

            return convertView;
        }

Answer 1

viewHolder.btnStatus.setOnClickListener(new View.OnClickListener() {
            @Override 
            public void onClick(View view) {
                Toast.makeText(view.getContext(),"" + getPosition(orderList),Toast.LENGTH_SHORT).show();
                         list.remove(position); //List/ArrayList of order in your program.

            } 
        }); 
        notifyDataSetChanged();

Answer 2

ArrayAdapter还有一个remove（T Object）方法，可以从列表中删除该项，也可以从ArrayList中删除它。首先在getView中获取订单

final myOrder order = getItem(position);

orderList是您在Constructor中传递的ArrayList。

viewHolder.btnStatus.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        //Your Toast message

        orderList.remove(position);
    }
});

notifyDataSetChanged();

如何使用arrayadapter中的按钮删除listview中的项目

2 个答案: