列表视图上的删除按钮仅删除最后一项，而不是我想要删除的特定项

Question

所以我正在使用列表视图，并且包含一个删除按钮，但是每当我按下特定列表项上的删除图标时，该项目不会被删除，只有列表的最后一项被删除。我不知道为什么会这样。最后一个项目会自动被删除，无论我按下了哪个项目的删除图标。

这是适配器类的代码：

// full subtask adapter code

package com.example.taskmasterv3;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import java.util.ArrayList;

public class SubtaskAdapter extends ArrayAdapter<subtask> {


    private final Context context;
    private ArrayList<subtask> values;


    public SubtaskAdapter(Context context, ArrayList<subtask> list) {

        //since your are using custom view,pass zero and inflate the custom view by overriding getview

        super(context, 0 , list);
        this.context = context;
        this.values = list;
    }



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

        //check if its null, if so inflate it, else simply reuse it
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.subtask_item, parent, false);
        }

        //use convertView to refer the childviews to populate it with data
        TextView tvSubtaskName = convertView.findViewById(R.id.tvSubtaskName);
        ImageView ivPri = convertView.findViewById(R.id.ivPri);
        ImageView ivTime = convertView.findViewById(R.id.ivTime);
        ImageView ivDelete = convertView.findViewById(R.id.ivDelete);

        tvSubtaskName.setText(values.get(position).getSubtaskName());

        if (values.get(position).isPriHigh()) {
            ivPri.setImageResource(R.drawable.priority_high);
        } else if (values.get(position).isPriMed()) {
            ivPri.setImageResource(R.drawable.priority_med);
        } else if (values.get(position).isPriLow()) {
            ivPri.setImageResource(R.drawable.priority_low);
        }

        if (values.get(position).isTimeMore()) {
            ivTime.setImageResource(R.drawable.time_symbol_more);
        } else if (values.get(position).isTimeMed()) {
            ivTime.setImageResource(R.drawable.time_symbol_med);
        } else if (values.get(position).isTimeLess()) {
            ivTime.setImageResource(R.drawable.time_symbol_less);
        }


        // Delete button for subtasks (NOT WORKING)

        ivDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                
             SubtaskAdapter.this.remove(SubtaskAdapter.this.getItem(position));

            }
        });

        //return the view you inflated
        return convertView;
    }


    //to keep adding the new subtasks try the following
    public void addANewSubTask(subtask newSubTask){
        ArrayList<subtask> newvalues = new ArrayList<>(this.values);
        newvalues.add(newSubTask);
        this.values = newvalues;
        notifyDataSetChanged();

    }

}

Answer 1

您可以尝试以下方法。

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder holder;
    if (convertView != null) {
        holder = (ViewHolder) convertView.getTag();
    } else {
        convertView = inflater.inflate(R.layout.subtask_item, parent, false);
        holder = new ViewHolder(convertView);
        convertView.setTag(holder);
    }
holder.ivDelete.setTag(position)
    holder.ivDelete.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int index = (Integer)v.getTag();
    values.remove(index)
    notifyDataSetChanged();
        }
    });

    return convertView;
}