我正在尝试构建一个ArrayAdapter将输出一行和该行中项目的数量的。但是，每次添加额外的行时，我都会得到不想要的效果。
我不知道我的逻辑有什么问题，但我确信这是小问题。下面是我的getView()方法：
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if(v == null){
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.order_row, null);
}
item = dishes.get(position);
if(lastItem != null){
if(!lastItem.getName().equals(item.getName())){
dishName = (TextView)v.findViewById(R.id.dishName);
dishPrice = (TextView)v.findViewById(R.id.dishPrice);
dishName.setText(item.getName());
dishPrice.setText(String.valueOf(item.getPrice()));
dishQty = (TextView)v.findViewById(R.id.dishQty);
dishQty.setText(String.valueOf(item.getQty()));
}
}
else{
dishName = (TextView)v.findViewById(R.id.dishName);
dishPrice = (TextView)v.findViewById(R.id.dishPrice);
dishName.setText(item.getName());
dishPrice.setText(String.valueOf(item.getPrice()));
dishQty = (TextView)v.findViewById(R.id.dishQty);
dishQty.setText(String.valueOf(item.getQty()));
}
lastItem = item;
return v;
}
目前我的输出是这样的
Chicken QUANTITY
2.99 2
然后，如果我添加一个新项目，数量会按预期增加，但它会添加另一行：
DISH NAME QUANTITY
DISH PRICE 0
关于我做错了什么的任何想法？
列表中的每个项目都是MenuItem我增加数量的类型，如下所示：
public void incQty(){
qty++;
}
这是数量增加的MenuItem阵列适配器getView()NumberPicker
public View getView(final int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.menuitem_row, null);
v.setFocusable(true);
}
// assign values to view
final MenuItem item = this.menuItems.get(position);
TextView nameView = (TextView) v.findViewById(R.id.item_name);
final TextView priceView = (TextView) v.findViewById(R.id.item_price);
nameView.setText(item.getName() + " ");
priceView.setText("€" + String.valueOf(item.getPrice()));
// number picker
np = (NumberPicker) v.findViewById(R.id.numpick);
np.setMaxValue(20);
np.setMinValue(0);
np.setValue(0);
np.setFocusable(false);
// calculation occurs when values are changed...
np.setOnValueChangedListener(new OnValueChangeListener() {
public void onValueChange(NumberPicker picker, int oldVal,
int newVal) {
//Add to order - increment price
if (newVal > oldVal) {
total = (item.getPrice() * newVal) - item.getPrice()
* oldVal;
Order.getInstance().addToOrder(item);
item.incQty();
amount += total;
Order.getInstance().setAmount(amount);
Toast.makeText(picker.getContext(), "Item Added: " + item.getName() + " Size: " + Order.getInstance().getOrderItems().size(), Toast.LENGTH_SHORT).show();
confirmBtn.setVisibility(View.VISIBLE);
}
//remove from order - decrement price
if (newVal < oldVal) {
total = (item.getPrice() * oldVal) - item.getPrice()
* newVal;
Order.getInstance().removeFromOrder(position);
item.decQty();
amount -= total;
Order.getInstance().setAmount(amount);
Toast.makeText(picker.getContext(), "Item removed: " + item.getName() + " Size: " + Order.getInstance().getOrderItems().size(), Toast.LENGTH_SHORT).show();
if(Order.getInstance().getOrderItems().size() == 0){
confirmBtn.setVisibility(View.INVISIBLE);
}
}
//update the text view price.
price.setText("€" + String.valueOf(Order.getInstance().getAmount()));
}
});
return v;
}