java - ListView删除元素后如何刷新？

Question

我创建了一个 ListView ，但是当我删除一个元素时，它不会刷新。我已经尝试过了

 adapter.notifyDataSetChanged();

和

getListView().invalidateViews();

在主要 Activity 中:

case R.id.ordini:

                    Ordini O = new Ordini();
                    android.app.FragmentManager fragmentManager0 = getFragmentManager();
                    android.app.FragmentTransaction fragmentTransaction0 = fragmentManager0
                            .beginTransaction();

                    fragmentTransaction0.replace(R.id.frame, O);
                    fragmentTransaction0.commit();

• Ordini.java

  public class Ordini extends ListFragment implements AdapterView.OnItemClickListener {
  
  int ArraySize;
  CustomAdapterOrdini adapter;
  private List<RowItemOrdini> rowItems;
  Button SendButton;
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
  
      return inflater.inflate(R.layout.ordini, null, false);
  
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
  
      super.onActivityCreated(savedInstanceState);
  
      ArraySize = MainActivity.ArrayProdotto.size();
      SendButton = (Button) getActivity().findViewById(R.id.send_btn);
  
      rowItems = new ArrayList<RowItemOrdini>();
  
      for (int i = 0; i < ArraySize; i++) {
          RowItemOrdini items = new RowItemOrdini(
                  MainActivity.ArrayProdotto.get(i),
                  R.drawable.ic_delete_black_24dp,
                  MainActivity.ArrayCode.get(i),
                  MainActivity.ArrayPrezzo.get(i),
                  MainActivity.ArrayColli.get(i),
                  MainActivity.ArrayQuantita.get(i));
  
          rowItems.add(items);
      }
  
      adapter = new CustomAdapterOrdini(getActivity(), rowItems);
      setListAdapter(adapter);
  
      getListView().setOnItemClickListener(this);
  
  
      SendButton.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              Toast.makeText(getActivity(), "invio ordine in corso... ", Toast.LENGTH_SHORT)
                      .show();
              SendOrdine();
          }
      });
  }
  @Override
  public void onResume(){
      super.onResume();
      adapter.notifyDataSetChanged();
      getListView().invalidateViews();
  }
  

• 自定义适配器Ordini

  public class CustomAdapterOrdini extends BaseAdapter {
  
  Context context;
  List<RowItemOrdini> rowItem;
  
  ImageView  Del;
  TextView Colli, Prezzo, Quantita, Code, Product;
  
  
  
  
  CustomAdapterOrdini(Context context, List<RowItemOrdini> rowItem) {
      this.context = context;
      this.rowItem = rowItem;
  
  }
  
  @Override
  public int getCount() {
  
      return rowItem.size();
  }
  
  @Override
  public Object getItem(int position) {
  
      return rowItem.get(position);
  }
  
  @Override
  public long getItemId(int position) {
  
      return rowItem.indexOf(getItem(position));
  }
  @Override
  public boolean  areAllItemsEnabled() {
      return false;
  }
  
  @Override
  public boolean isEnabled(int position) {
      return false;
  }
  
  
  
  
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
  
      if (convertView == null) {
          LayoutInflater mInflater = (LayoutInflater) context
                  .getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
          convertView = mInflater.inflate(R.layout.list_ordini, null);
      }
      Code = (TextView) convertView.findViewById(R.id.prodcode);
      Product = (TextView) convertView.findViewById(R.id.PRODOTTO);
      Del = (ImageView) convertView.findViewById(R.id.del);
  
      Colli = (TextView) convertView.findViewById(R.id.T1);
      Prezzo = (TextView) convertView.findViewById(R.id.T2);
      Quantita = (TextView) convertView.findViewById(R.id.T3);
  
  
      Del.setFocusable(true);
      Del.setClickable(true);
  
      Del.setTag(convertView);
  
      final RowItemOrdini row_pos = rowItem.get(position);
      // setting the image resource and title
      Del.setImageResource(R.drawable.ic_delete_black_24dp);
      Product.setText(row_pos.getTitle());
      Code.setText(row_pos.getCode());
  
      Colli.setText(row_pos.getColli());
      Prezzo.setText(row_pos.getPrezzo());
      Quantita.setText(row_pos.getQuantita());
  
      Del.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
  
              // HERE I WANT REFRESH MY LISTVIEW
  
              MainActivity.ArrayQuantita.remove(0);
              MainActivity.ArrayCode.remove(0);
              MainActivity.ArrayProdotto.remove(0);
              MainActivity.ArrayColli.remove(0);
              MainActivity.ArrayPrezzo.remove(0);
  
              CustomAdapter.ShowDialog("Elemento eliminato con successo!", context);
  
          }
      });
  
      return convertView;
  
  }
  

有人可以帮我刷新 ListView 吗？我想刷新 CustomAdapterOrdini 中的 ListView 或 Ordini.java 中的 onResume 中的 ListView 。

public void onClick(View v) {

                // HERE I WANT REFRESH MY LISTVIEW

有简单的方法吗？非常感谢!

Answer 1

您已在 MainActivity 中声明 ArrayProdotto，并且您将在 CustomAdapterOrdini 中显示来自 rowItem 的数据。您必须从两个列表中删除数据并调用 notifyDataSetChanged();

如下面的代码。

Del.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

         // HERE I WANT REFRESH MY LISTVIEW
         MainActivity.ArrayProdotto.remove(position); //Delete from main source
         rowItem.remove(position) // Delete from adapter
         CustomAdapter.ShowDialog("Elemento eliminato con successo!", context);
         notifyDataSetChanged(); // Refresh Adapter

    }
});