Erro em Aplicação Android - Erro no ListView com botões

[Erro em Aplicação Android - Erro no ListView com botões]

Sou iniciante em Android, e fiz uma pequena aplicação Android de teste, usando Java, para aprender a utilizar um ListView com botões, e tive um problema. Os botões não funcionam direito, as vezes eu clico em cima do Edit, ele muda a mensagem para clicado, "Edit", confirmando que eu cliquei ai. Mas tem vezes que eu clico no botão Delete, e depois no botão Edit, e o texto não é mudado, ou seja o evento click não funcionou, se eu coloco um break point, no código-fonte, onde está entrando no evento setOnItemClickListener. Mas a mensagem exibida, não está correta.
E tem um outro erro, de funcionamento do AlertDialog, da mensagem de confirmação de deleção.
O código-fonte está abaixo.
Por favor, alguém poderia me ajudar ?

 

AgendaActivity.java

package com.test.android.view;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.test.android.model.Agenda;
import com.test.android.util.Util;

public class AgendaActivity extends AppCompatActivity {

    ListView listview;
    MyArrayAdapter agendaArrayAdapter;
    ArrayList<AgendaTo> agendaArray = new ArrayList<AgendaTo>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_agenda);

        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");

        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("Nick", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("John", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("Anthony", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("James", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("Jack", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()), Util.fillSpaces("Jeremy", 50)));
        agendaArray.add(new AgendaTo(sdf.format(new Date()),Util.fillSpaces("Long", 50)));

        agendaArrayAdapter = new MyArrayAdapter(AgendaActivity.this, R.layout.list_item, agendaArray);
        listview = (ListView) findViewById(R.id.listView);
        listview.setItemsCanFocus(false);
        listview.setAdapter(agendaArrayAdapter);

        listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View v,
                                    final int position, long id) {

                Toast.makeText(AgendaActivity.this,
                        "List Item Clicked:" + position, Toast.LENGTH_LONG)
                        .show();
            }
        });

    }

} 

MyArrayAdapter.java

package com.test.android.view;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.text.SimpleDateFormat;
import java.util.ArrayList;


public class MyArrayAdapter extends ArrayAdapter<AgendaTo> {

    Context context;
    int layoutResourceId;
    ArrayList<AgendaTo> agendas = new ArrayList<AgendaTo>();

    public MyArrayAdapter(Context context, int layoutResourceId,
                          ArrayList<AgendaTo> agendas) {
        super(context, layoutResourceId, agendas);
        this.layoutResourceId = layoutResourceId;
        this.context = context;
        this.agendas = agendas;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View item = convertView;
        AgendaWrapper agendaWrapper = null;

        if (item == null) {
            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
            item = inflater.inflate(layoutResourceId, parent, false);
            agendaWrapper = new AgendaWrapper();
            agendaWrapper.nome = (TextView) item.findViewById(R.id.textNome);
            agendaWrapper.data = (TextView) item.findViewById(R.id.textData);
            agendaWrapper.edit = (Button) item.findViewById(R.id.btnEdit);
            agendaWrapper.delete = (Button) item.findViewById(R.id.btnDelete);
            item.setTag(agendaWrapper);
        } else {
            agendaWrapper = (AgendaWrapper) item.getTag();
        }

        AgendaTo agenda = agendas.get(position);
        agendaWrapper.nome.setText(agenda.getNome());
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        agendaWrapper.data.setText(sdf.format(agenda.getData()));        

        agendaWrapper.edit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(context, "Edit", Toast.LENGTH_LONG).show();
            }
        });

        final int absolutePsition = position;
        final AgendaWrapper itemDelete = agendaWrapper;
        final ViewGroup viewGroup = parent;

        agendaWrapper.delete.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Toast.makeText(context, "Delete " + absolutePsition, Toast.LENGTH_LONG).show();
                AlertDialog diaBox = AskOption(itemDelete, absolutePsition, viewGroup);
                diaBox.show();

            }
        });

        return item;

    }

    private AlertDialog AskOption(AgendaWrapper agendaWrapper, int position, final ViewGroup viewGroup) {
        final int deletePosition = position;
        AlertDialog myQuittingDialogBox = new AlertDialog.Builder(context)
			
                .setTitle("Delete")
                .setMessage("Do you want to Delete")
			
                .setPositiveButton("Delete", new DialogInterface.OnClickListener() {

                    public void onClick(DialogInterface dialog, int whichButton) {
                        agendas.remove(deletePosition);
                        refreshListView(agendas, viewGroup);
                        dialog.dismiss();
                    }

                    private void refreshListView(final ArrayList<AgendaTo> agendas, final ViewGroup viewGroup) {
                        final MyArrayAdapter myArrayAdapter = new MyArrayAdapter(context, R.layout.list_item, agendas);
                        final LayoutInflater inflater = ((Activity) context).getLayoutInflater();
                        final View view = inflater.inflate(layoutResourceId, viewGroup, false);
                        final ListView listview = (ListView) view.findViewById(R.id.listView);
                        listview.setAdapter(myArrayAdapter);
                    }

                })
                .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                })
                .create();

        return myQuittingDialogBox;
    }


    static class AgendaWrapper {
        TextView nome;
        TextView data;
        Button edit;
        Button delete;
    }

}

list_item.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="4dp"
    tools:context=".AgendaActivity" >

    <TextView
        android:id="@+id/textNome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="Nome:"
        android:width="50dp"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textData"
        android:layout_alignTop="@id/textNome"
        android:layout_alignRight="@id/textNome"
        android:layout_alignParentLeft="true"
        android:layout_marginTop="5dp"
        android:width="50dp"
        android:text="Data:"
        android:textAppearance="?android:attr/dateTextAppearance"
        android:textSize="16sp" />

    <Button
        android:id="@+id/btnEdit"
        android:layout_width="80dp"
        android:layout_height="40dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:background="#99CC"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:text="Edit"
        android:textColor="#FFFFFF" />

    <Button
        android:id="@+id/btnDelete"
        android:layout_width="80dp"
        android:layout_height="40dp"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/btnEdit"
        android:layout_marginTop="3dp"
        android:background="#99CC"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:text="Delete"
        android:textColor="#FFFFFF" />

</RelativeLayout>

activity_agenda.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#990044"
    tools:context="com.test.android.view.AgendaActivity" >

    <TextView
        android:id="@+id/listLabel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="Touch List"
        android:textColor="#FFFFFF"
        android:textSize="25sp" />

    <ListView
        android:id="@+id/listView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/listLabel"
        android:layout_marginTop="5dp"
        android:cacheColorHint="#FFFFFF" />

</RelativeLayout>