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>