【发布时间】：2011-11-13 02:49:40
【问题描述】：
我有一个带有自定义数组适配器的列表视图，该视图允许用户使用我实现的一些加号和减号按钮来上下更改变量
现在的问题是加号/减号按钮将更改一次视图，但在那之后它不会更新，直到视图以不同的方式刷新。就像在外部操作中使用listview.notifydatasetchanged()。
当它更新时，它显示加号/减号按钮正在注册点击并更新变量，因为在更新数据集时它会立即将正确的变量放入视图中
为什么单个视图不能自行更新？
private class MyListAdapter extends ArrayAdapter<Item> {
private ArrayList<Item> items;
TextView quantity;
int i;
public MyListAdapter(Context context, int textViewResourceId, ArrayList<Item> items) {
super(context, textViewResourceId, items);
this.items=items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.list_scanneditems, null);
}
final Item allItems = items.get(position);
//declare all parts of the cell
TextView product = (TextView)v.findViewById(R.id.productName);
quantity = (TextView)v.findViewById(R.id.listNum);
TextView category = (TextView)v.findViewById(R.id.categoryName);
TextView price = (TextView)v.findViewById(R.id.productCost);
product.setText(allItems.product);
category.setText(allItems.category);
price.setText("$" + allItems.price);
quantity.setText(String.valueOf(allItems.quantity)); //might want to do ceiling and floor functions here, IF weight not present
//set properties within on click listeners
//items.set(position, allItems.quantity);
ImageView selectLeft = (ImageView)v.findViewById(R.id.selectleft_list);
ImageView selectRight = (ImageView)v.findViewById(R.id.selectright_list);
CheckBox itemCheckBox = (CheckBox)v.findViewById(R.id.itemCheckBox);
itemCheckBox.setChecked(selectallListener);
itemCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(isChecked==false && selectallListener==true)
{
selectallListener=false;
CheckBox selectAll = (CheckBox)findViewById(R.id.selectAll);
selectAll.setChecked(false);
}
}
});
selectLeft.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(allItems.quantity > 0) //i greater than 0, decrement -1
{
allItems.setQuantity(allItems.quantity-1);
quantity.setText(String.valueOf(allItems.quantity));
}
else //i less or equal to 0
{
allItems.setQuantity(0);
quantity.setText(String.valueOf(allItems.quantity));
//turn icon into an X here an if it is X delete the item
}
}//onclick
});//selectleft listener
selectRight.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
allItems.setQuantity(allItems.quantity+1);
quantity.setText(String.valueOf(allItems.quantity));
}//onclick
});//selectRight listener
//do I need viewholder here?
//set listeners
return v;
}
【问题讨论】：
标签： android listview view adapter