我正在开发 Android 项目。在我扩展 FragmentActivity 的 OrderPage 类中,我有我的产品列表。在扩展 ListFragment 的 PositionsFragment 类中,我实现了不想刷新的 List。
我添加了方法 validatePositionsList,它应该:从 OrderPage 中获取我的产品列表,然后再次编写我的名为 arrr 的字符串表并调用 notifyDataSetChanged 以刷新列表。最后一步不行。我检查了所有内容,唯一的问题是我的 ListFragment 不会刷新。我刷新错了吗?
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");
}
}
}