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我有一個自定義的數組適配器列表視圖,該視圖允許用戶與一些加號和減號按鈕,我實現Android的列表視圖,觀察室將只更新一次
現在的問題是,改變一個變量上下加/減按鈕將改變視圖ONCE,但在此之後它不會更新,直到視圖以不同的方式刷新。例如在外部操作中使用listview.notifydatasetchanged()
。
,當它更新,它表明了加/減按鈕WERE的點擊次數和更新變量,因爲對數據的更新設置後立即將正確的變量視圖
爲什麼不是個人查看自己更新?
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;
}
你建議我做什麼? – CQM
而不是類變量使用本地/函數變量。就像allItems(多麼令人誤解的名字)變量一樣。 ... //聲明單元格的所有部分 TextView product =(TextView)v.findViewById(R.id.productName); final TextView quantity =(TextView)v.findViewById(R.id.listNum); ... – Deucalion
這工作,謝謝 – CQM