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>
