自定义的ListView与cheboxes [英] Custom ListView with cheboxes
本文介绍了自定义的ListView与cheboxes的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
当在一个Android应用程序的自定义列表视图所有复选框被选中，我可以怎么知道的？我有一个自定义列表视图，我只是想知道，当列表中的所有复选框被选中，并显示一条消息给用户，对不起我的英语水平。
how i can know when all checkboxes in a custom listview in a android application are checked? I have a custom listview and i just want to know when all checkboxes in the list are checked and show a message to the user, sorry for my english.
这是code代表我的适配器，但它不是工作...
this is the code for my adapter, but its not work...
public class MeuAdapter extends ArrayAdapter<LinhaItem>
{
private final List<LinhaItem> lista;
private final Activity contexto;
private final boolean[] pegos;
private double total = 0;
public MeuAdapter(Activity contexto, List<LinhaItem> lista)
{
super(contexto, R.layout.produtos, lista);
this.contexto = contexto;
this.lista = lista;
pegos = new boolean[this.lista.size()];
for(int i = 0; i < this.lista.size(); i++)
{
pegos[i] = false;
}
}
static class ViewHolder
{
protected TextView texto;
protected CheckBox checkbox;
protected EditText edit;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View view = null;
final int posicao = position;
if(convertView == null)
{
LayoutInflater inflater = contexto.getLayoutInflater();
view = inflater.inflate(R.layout.produtos, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.texto = (TextView) view.findViewById(R.id.txtDescricao);
viewHolder.checkbox = (CheckBox) view.findViewById(R.id.chkProduto);
viewHolder.edit = (EditText) view.findViewById(R.id.txtValor);
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
LinhaItem elemento = (LinhaItem) viewHolder.checkbox.getTag();
elemento.setSelecionado(buttonView.isChecked());
if(elemento.Selecionado())
{
pegos[posicao] = true;
}
total += lista.get(posicao).getValor();
boolean cheia = true;
for(int i = 0; i < lista.size(); i++)
{
cheia = pegos[i];
//Toast.makeText(contexto, "pego["+i+"]"+pegos[i], 10000).show();
}
if(cheia)
{
Toast.makeText(contexto, "Compra finalizada, valor total: " + total, 10000).show();
}
}
});
view.setTag(viewHolder);
viewHolder.checkbox.setTag(lista.get(position));
}
else
{
view = convertView;
((ViewHolder) view.getTag()).checkbox.setTag(lista.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.texto.setText(lista.get(position).getTexto());
holder.checkbox.setChecked(lista.get(position).Selecionado());
holder.edit.setText(Double.toString((lista.get(position).getValor())));
return view;
}
}
我的新code是：
My new code is that:
package br.com.boitata.cadastroprodutos;
import java.util.List;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.*;
public class CadastroProdutosActivity extends Activity {
private Button btnInserir;
private EditText txtDescricao;
private EditText txtValor;
private TextView txtTotal;
private ListView lstProdutos;
private ProdutoBD bd;
private MeuAdapter adapter;
List<Produto> lista;
List<LinhaItem> linhas;
private double total = 0;
public void preencheLista(List<Produto> lp, ListView lista)
{
int tam = lp.size();
linhas = new ArrayList<LinhaItem>();
for(int i = 0; i < tam; i++)
{
Produto p = lp.get(i);
linhas.add(getLinha(p.getDescricao()));
}
adapter = new MeuAdapter(this, linhas);
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, android.R.id.text1, valores);
lista.setAdapter(adapter);
}
public LinhaItem getLinha(String texto)
{
return new LinhaItem(texto);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cadastro_produtos);
btnInserir = (Button) findViewById(R.id.btnInserir);
txtDescricao = (EditText) findViewById(R.id.txtDescricao);
txtValor = (EditText) findViewById(R.id.txtValor);
txtTotal = (TextView) findViewById(R.id.txtTotal);
lstProdutos = (ListView) findViewById(R.id.lstProdutos);
lstProdutos.setBackgroundColor(Color.BLACK);
bd = new ProdutoBD(getApplicationContext());
lista = bd.listaProdutos();
preencheLista(lista, lstProdutos);
btnInserir.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
String checados = "";
for(int i = 0; i < lista.size(); i++)
{
checados += "pego[" + i + "]" + " " + pegos[i] + " - ";
}
Toast.makeText(getApplicationContext(), checados, 40000).show();
/* Produto p = new Produto();
p.setDescricao(txtDescricao.getText().toString());
p.setValor(Double.parseDouble(txtValor.getText().toString()));
bd.insere(p);
lista = bd.listaProdutos();
preencheLista(lista, lstProdutos);
int i = 0;
total = 0;
while(i < lista.size())
{
p = lista.get(i);
total += p.getValor();
i++;
}
txtTotal.setText("Total: " + Double.toString(total));*/
}
});
}
private boolean[] pegos;
private boolean[] passados;
public class MeuAdapter extends ArrayAdapter<LinhaItem>
{
private final List<LinhaItem> lista;
private final Activity contexto;
private double total = 0;
private int qtde = 0;
public MeuAdapter(Activity contexto, List<LinhaItem> lista)
{
super(contexto, R.layout.produtos, lista);
Toast.makeText(contexto, "Construindo", 10000).show();
this.contexto = contexto;
this.lista = lista;
qtde = this.lista.size();
pegos = new boolean[qtde];
passados = new boolean[qtde];
for(int i = 0; i < this.lista.size(); i++)
{
pegos[i] = false;
passados[i] = false;
}
}
public class ViewHolder
{
protected TextView texto;
protected CheckBox checkbox;
protected EditText edit;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
View view = null;
final int posicao = position;
if(convertView == null)
{
LayoutInflater inflater = contexto.getLayoutInflater();
view = inflater.inflate(R.layout.produtos, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.texto = (TextView) view.findViewById(R.id.txtDescricao);
viewHolder.checkbox = (CheckBox) view.findViewById(R.id.chkProduto);
viewHolder.edit = (EditText) view.findViewById(R.id.txtValor);
viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
LinhaItem elemento = (LinhaItem) viewHolder.checkbox.getTag();
elemento.setSelecionado(buttonView.isChecked());
pegos[posicao] = isChecked;
if(elemento.Selecionado())
{
pegos[posicao] = true;
qtde--;
}
else if(qtde < lista.size() && passados[posicao])
{
qtde++;
}
total += lista.get(posicao).getValor();
boolean cheia = true;
for(int i = 0; i < lista.size(); i++)
{
if(!pegos[i])
{
cheia = false;
break;
}
//Toast.makeText(contexto, "pego["+i+"]"+pegos[i], 10000).show();
}
if(cheia || qtde == 0)
{
Toast.makeText(contexto, "Compra finalizada, valor total: " + total, 10000).show();
}
// Toast.makeText(contexto, "Quantidade não selecionada: " + qtde, 5000).show();
}
});
view.setTag(viewHolder);
viewHolder.checkbox.setTag(lista.get(position));
}
else
{
view = convertView;
((ViewHolder) view.getTag()).checkbox.setTag(lista.get(position));
}
ViewHolder holder = (ViewHolder) view.getTag();
holder.texto.setText(lista.get(position).getTexto());
holder.checkbox.setChecked(lista.get(position).Selecionado());
holder.edit.setText(Double.toString((lista.get(position).getValor())));
passados[posicao] = true;
return view;
}
}
}
这个工程只是目前出现的行...
this works just for the rows currently appearing...
推荐答案
要测试，如果你检查的最后选中复选框在列表中的行，你可以使用几种方法。这里有一个：
To test if you checked the last unchecked CheckBox in the list's rows you could use several approaches. Here is one:
boolean allChecked = true;
for(int i = 0; i < lista.size(); i++) {
if (!pegos[i]) {
// it appears that one of our ChckBoxes is currently unchecked so
// we already know that not all CheckBoxes are checked
allChecked = false;
break;
}
if (allChecked) {
// if we get here and allChecked is true than all CheckBoxes are checked
Toast.makeText(contexto, "All checked!!", 10000).show();
}
要避免用户每次检查时间循环的布尔数组复选框你可以有在一个 INT 字段适配器最初是布尔数组的大小。当用户选中一个复选框您 1 从领域，降低当用户取消选中一个复选框您 1 该字段。在同一个监听器你测试，看看是否字段是 0 在这种情况下，所有的的CheckBox 进行检查。
To avoid looping that boolean array each time the user checks a CheckBox you could have a int field in the adapter which initially is the size of the boolean array. When the user checks a CheckBox you decrease with 1 from that field, when the user unchecks a CheckBox you increase with 1 that field. In the same listener you test to see if that field is 0 in which case all the CheckBoxes are checked.
这篇关于自定义的ListView与cheboxes的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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