[英]Delete button on list view only deletes the last item and not the particular one I want it to delete
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,只会删除列表的最后一项。 我不知道为什么会这样。 最后一个项目会自动删除,不管我按下的是什么项目的删除图标。
这是适配器 Class 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();
}
}
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;
}
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