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[英]How to use .notifyDataSetChanged() to update SimpleCursorAdapter in Listfragment?
[英]ArrayAdapter in my ListFragment won't refresh even when I use notifyDataSetChanged
我正在從事Android項目。 在擴展FragmentActivity的OrderPage類中,我的產品具有列表。 在擴展ListFragment的PositionsFragment類中,我實現了List,不想刷新。
我添加了方法validatePositionsList,該方法應該:從OrderPage中獲取我的產品列表,然后再次寫入名為arrr的字符串表,並調用notifyDataSetChanged刷新列表。 最后一步不起作用。 我檢查了所有內容,唯一的問題是我的ListFragment無法刷新。 我刷新錯了嗎?
public class PositionsFragment extends ListFragment {
static ArrayAdapter la;
static List<String> positionsString;
static String[] arrr;
int fragNum;
public static PositionsFragment init(int val) {
positionsList = new PositionsFragment();
// Supply val input as an argument.
Bundle args = new Bundle();
args.putInt("val", val);
positionsList.setArguments(args);
validatePositionsList();
return positionsList;
}
/**
* Retrieving this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fragNum = getArguments() != null ? getArguments().getInt("val") : 1;
}
/**
* The Fragment's UI is a simple text view showing its instance number and
* an associated list.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
validatePositionsList();
View layoutView = inflater.inflate(R.layout.fragment_order_list_positions,
container, false);
View tv = layoutView.findViewById(R.id.text);
((TextView) tv).setText("Pozycje zamówienia");
return layoutView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
la = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, arrr);
la.notifyDataSetChanged();
setListAdapter(la);
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("Truiton FragmentList", "Item clicked: " + id);
}
public static void validatePositionsList() {
tempMyProducts = OrderPage.getProducts();
positionsString = new ArrayList<String>();
positionsString.add("mm");
for(myProduct obj : tempMyProducts)
{
Log.e("validatePositionsList", String.valueOf(obj.getNazwa()));
positionsString.add("mm");
}
arrr = Arrays.copyOf(positionsString.toArray(),positionsString.toArray().length,String[].class);
if(la!=null)
{
la.notifyDataSetChanged();
Log.e("validatePositionsList", "Odswiezam");
}
}
}
我認為您正在更改數組,但是這些更改不會影響適配器內部列表。 嘗試以下代碼:
arrr = Arrays.copyOf(positionsString.toArray(),positionsString.toArray().length,String[].class);
if(la!=null)
{
la.clear();
for (int i = 0; i < arrr.length; i++)
la.add(arrr[i]);
la.notifyDataSetChanged();
Log.e("validatePositionsList", "Odswiezam");
}
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