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    • By jrxxjr
      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>  
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