按照一些教程，我成功制作了一个自定义列表。
但是整个屏幕只是一个列表
现在想将列表放在表单下方。并让整个屏幕随着列表滚动(看到列表中的最后一项，表单需要上升)
日志(Toasty)显示该项目已添加，但没有出现任何内容。我不知道问题是否出在我添加的方式上，或者是我尝试显示的方式
这是我的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:fillViewport="true"
android:padding="5dp" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/cliente" />
<EditText
android:id="@+id/venda_form_cliente"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:cursorVisible="false"
android:focusable="false"
android:hint="@string/selecione_um_cliente" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="@string/produto" />
<EditText
android:id="@+id/venda_form_prod"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:cursorVisible="false"
android:focusable="false"
android:hint="@string/selecione_um_produto" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/quantidade" />
<EditText
android:id="@+id/venda_form_qtd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:selectAllOnFocus="true"
android:text="@string/um" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/valor" />
<EditText
android:id="@+id/venda_form_valor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cursorVisible="false"
android:focusable="false"
android:inputType="none" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/desconto" />
<EditText
android:id="@+id/venda_form_desc"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:selectAllOnFocus="true"
android:text="@string/zero" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/subtotal" />
<EditText
android:id="@+id/venda_form_subtotal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cursorVisible="false"
android:focusable="false"
android:inputType="none" />
</LinearLayout>
</LinearLayout>
<Button
android:id="@+id/venda_form_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:padding="10dp"
android:text="@string/adicionar" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:scrollbars="none" >
</ListView>
</LinearLayout>
</LinearLayout>
</LinearLayout>
还有我的 Activity
public class VendaFormActivity extends Activity {
private Cliente cliente;
// private Spinner condicaoSelect;
private Produto produto;
private TextWatcher somar;
private ItemVenda itemVenda;
private ListaAdapter listaAdapter;
private EditText inputQuantidade;
private EditText inputDesconto;
private EditText inputSubTotal;
private EditText inputProduto;
private EditText inputValor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_venda_form);
inputProduto = ((EditText) findViewById(R.id.venda_form_prod));
inputValor = ((EditText) findViewById(R.id.venda_form_valor));
((EditText) findViewById(R.id.venda_form_cliente)).setOnClickListener(new ClickListener(this, ClienteActivity.class, MainActivity.REQUEST_CLIENTE));
inputProduto.setOnClickListener(new ClickListener(this, ProdutoActivity.class, MainActivity.REQUEST_PRODUTO));
//condicaoSelect = (Spinner) findViewById(R.id.venda_form_condicao);
//new CondicaoHelper(this).popular(condicaoSelect);
bindCamposValores();
fazerLista();
bindBtnAdd();
}
private void limparCamposValores() {
inputDesconto.setText("0.00");
inputQuantidade.setText("1");
inputSubTotal.getText().clear();
inputProduto.getText().clear();
}
private void bindBtnAdd() {
((Button) findViewById(R.id.venda_form_btn)).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try{
Double quantidade = Double.parseDouble( inputQuantidade.getText().toString() );
Double desconto = Double.parseDouble( inputDesconto.getText().toString() );
itemVenda = new ItemVenda();
itemVenda.setDesconto(desconto);
itemVenda.setProduto(produto);
itemVenda.setQuantidade(quantidade);
listaAdapter.setNotifyOnChange(true);
listaAdapter.getItens().add(itemVenda);
listaAdapter.notifyDataSetChanged();
Toast.makeText(getApplication(), "Foi", Toast.LENGTH_SHORT).show();
limparCamposValores();
} catch (Exception e) {
Toast.makeText(getApplication(), "Invalido", Toast.LENGTH_SHORT).show();
// NPE no produto
// NumberFormat nos valores
}
}
});
}
private void fazerLista() {
listaAdapter = new ListaAdapter(getApplicationContext());
((ListView) findViewById(android.R.id.list)).setAdapter(listaAdapter);
}
static class ViewHolder {
protected TextView descricao;
protected TextView codigo;
protected TextView ean;
protected TextView referencia;
protected TextView quantidade;
protected TextView valor_unit;
protected TextView valor_item;
}
private class ListaAdapter extends ArrayAdapter<ItemVenda>{
private final Context context;
private final List<ItemVenda> itens;
public ListaAdapter(Context context) {
super(context, R.layout.produto_list);
this.context = context;
this.itens = new LinkedList<ItemVenda>();
}
public ListaAdapter(Context context, List<ItemVenda> itens) {
super(context, R.layout.produto_list, itens);
this.context = context;
this.itens = itens;
}
public List<ItemVenda> getItens() {
return itens;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = null;
if (convertView == null) {
LayoutInflater inflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflator.inflate(R.layout.produto_list_item, null);
final ViewHolder viewHolder = new ViewHolder();
viewHolder.descricao = (TextView) view.findViewById(R.id.descricao);
viewHolder.codigo = (TextView) view.findViewById(R.id.codigo);
viewHolder.ean = (TextView) view.findViewById(R.id.ean);
viewHolder.referencia = (TextView) view.findViewById(R.id.referencia);
viewHolder.quantidade = (TextView) view.findViewById(R.id.quantidade);
viewHolder.valor_unit = (TextView) view.findViewById(R.id.valor_unit);
viewHolder.valor_item = (TextView) view.findViewById(R.id.valor_item);
view.setTag(viewHolder);
} else {
view = convertView;
}
ViewHolder holder = (ViewHolder) view.getTag();
ItemVenda item = itens.get(position);
holder.descricao.setText(item.getProduto().getNome());
holder.codigo.setText(item.getProduto().getCodigo());
holder.ean.setText(item.getProduto().getEan());
holder.referencia.setText(item.getProduto().getReferencia());
holder.quantidade.setText(item.getQuantidade().toString());
holder.valor_unit.setText(item.getProduto().getPreco().toString());
holder.valor_item.setText(item.getSubTotal().toString());
return view;
}
}
private void bindCamposValores() {
inputQuantidade = ((EditText) findViewById(R.id.venda_form_qtd));
inputDesconto = ((EditText) findViewById(R.id.venda_form_desc));
inputSubTotal = ((EditText) findViewById(R.id.venda_form_subtotal));
somar = new TextWatcher() {
@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { }
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { }
@Override
public void afterTextChanged(Editable arg0) {
Double sub = 0.0;
try{
itemVenda = new ItemVenda();
itemVenda.setQuantidade(Double.parseDouble(inputQuantidade.getText().toString()));
itemVenda.setDesconto(Double.parseDouble(inputDesconto.getText().toString()));
itemVenda.setProduto(produto);
sub = itemVenda.getSubTotal();
} catch (Exception e) {
// algum campo não é numero/está vazio
}
inputSubTotal.setText(""+sub);
}
};
// Se mudar o valor
inputQuantidade.addTextChangedListener(somar);
inputDesconto.addTextChangedListener(somar);
// quando sair do campo
inputQuantidade.setOnFocusChangeListener(new Focus("1"));
inputDesconto.setOnFocusChangeListener(new Focus("0.00"));
}
private class Focus implements OnFocusChangeListener {
private final String padrao;
public Focus(String padrao){
this.padrao = padrao;
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(!hasFocus){
Editable text = ((EditText) v).getText();
if(null == text || "".equals(text.toString())){
text.append(padrao);
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_venda_form, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_copiar:
copiar();
return true;
case R.id.menu_simulacao:
simulacao();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void copiar() {
Toast.makeText(getApplication(), "Nada ainda", Toast.LENGTH_SHORT).show();
}
private void simulacao() {
Intent intent = new Intent(getApplicationContext(), SimulacaoPagtoActivity.class);
startActivityForResult(intent, MainActivity.REQUEST_SIMULACAO);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == MainActivity.REQUEST_CLIENTE) {
if (resultCode == RESULT_OK) {
cliente = (Cliente) intent.getSerializableExtra(MainActivity.RESULT_MODEL_LIST);
((EditText) findViewById(R.id.venda_form_cliente)).setText(cliente.getNome());
}
} else if (requestCode == MainActivity.REQUEST_PRODUTO) {
if (resultCode == RESULT_OK) {
produto = (Produto) intent.getSerializableExtra(MainActivity.RESULT_MODEL_LIST);
inputProduto.setText(produto.getNome());
inputValor.setText(""+produto.getPreco());
somar.afterTextChanged(null);
}
} else if(requestCode == MainActivity.REQUEST_SIMULACAO){
// o que fazer quando voltar da simulação ?
}
}
}
最后，我的项目布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:orientation="vertical"
android:padding="5dp" >
<TextView
android:id="@+id/descricao"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#333"
android:textSize="16sp"
android:textStyle="bold" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/codigo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="CODIGO" />
<TextView
android:id="@+id/ean"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="EAN" />
<TextView
android:id="@+id/referencia"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="REFERENCIA" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/quantidade"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="QUANT." />
<TextView
android:id="@+id/valor_unit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="VLR UNIT" />
<TextView
android:id="@+id/valor_item"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="VLR ITEM" />
</LinearLayout>
</LinearLayout>
更新
当我在列表中添加项目时，没有显示任何内容。但是，当我单击 TextEdit 并打开虚拟键盘后，输入一些值后，我关闭键盘，然后调用 adapter.getView () 并出现列表
最佳答案
我想我发现了你的问题。不应该是下面的代码吗:
((ListView) findViewById(android.R.id.list)).setAdapter(listaAdapter);
是:
((ListView) findViewById(R.id.list)).setAdapter(listaAdapter);
相反？
您正在尝试查找默认的 Android View ，而不是您创建的 View ，这意味着您实际上并未为 ListView 设置适配器。
关于java - 自定义ListView不显示，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16660440/