无法使用之前设置的按钮从 customAdapter 更改 textview 值，为什么？

Question

我已经像这样从 ArrayList 设置了 textView 的值

        mealCounterTV = (TextView) view.findViewById(R.id.counterTV);
        mealCounterTV.setText(quantityList.get(position));

有一个按钮，通过单击我试图更改 textview 值，该值正在更改但无法将更改后的值设置为 textView，

addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                count = Integer.parseInt(mealCounterTV.getText().toString());
                count++;
                mealCounterTV.setText(String.valueOf(count));
                notifyDataSetChanged();
            }
        });

谁能指出我哪里做错了？我的整个适配器是这样的，

package com.nerdcastle.nazmul.mealdemo;

import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;


class AdapterForMealSubmission extends BaseAdapter {
    ViewHolder holder;
    Activity activity;
    ArrayList<String> employeeNameList = new ArrayList<>();
    ArrayList<String> quantityList = new ArrayList<>();

    public AdapterForMealSubmission(Activity activity, ArrayList<String> employeeNameList, ArrayList<String> quantityList) {
        super();
        this.activity = activity;
        this.employeeNameList = employeeNameList;
        this.quantityList = quantityList;
    }

    public int getCount() {
        return quantityList.size();
    }

    public Object getItem(int position) {
        return quantityList.get(position);
    }

    public long getItemId(int position) {
        return 0;
    }

    private class ViewHolder {
        public TextView nameTV;
        public Button deleteBtn;
        public Button addBtn;
        public TextView mealCounterTV;
    }


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

        LayoutInflater inflater = activity.getLayoutInflater();

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.custom_row_for_meal_submission, null);
            holder = new ViewHolder();
            holder.mealCounterTV = (TextView) convertView.findViewById(R.id.counterTV);
            holder.nameTV = (TextView) convertView.findViewById(R.id.nameTV);
            holder.deleteBtn = (Button) convertView.findViewById(R.id.minus_btn);
            holder.addBtn = (Button) convertView.findViewById(R.id.add_btn);
            convertView.setTag(holder);

            holder.addBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    int count = Integer.parseInt(holder.mealCounterTV.getText().toString());
                    count++;
                    holder.mealCounterTV.setText("" + count);
                    notifyDataSetChanged();
                }
            });
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.mealCounterTV.setText(quantityList.get(position));
        holder.nameTV.setText(employeeNameList.get(position));
        holder.addBtn.setTag(holder);
        holder.deleteBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int count = Integer.parseInt(holder.mealCounterTV.getText().toString());
                if (count > 0) {
                    count--;
                }
                holder.mealCounterTV.setText("" + count);
                notifyDataSetChanged();
            }
        });

        return convertView;
    }

}

Answer 1

尝试从点击侦听器中删除 notifyDataSetChanged。因为这会导致适配器再次重新绑定列表中的值并将列表重置为初始状态。

Answer 2

您在设置文本后执行 notifyDataSetChanged() 是有原因的吗？因为每次你这样做，它都会用你传递的数据集中的值覆盖你的新 textView 值。

无法使用之前设置的按钮从 customAdapter 更改 textview 值，为什么？

Unable to change textview value from customAdapter using button once set before,why?

android

listview

custom-adapter