notifyDataSetChanged（）方法未刷新listview

Question

單擊按鈕后，我正在執行刪除和刪除應用程序中的所有操作。 當我單擊刪除按鈕時，項目將從列表視圖中刪除以及從服務器中刪除。當我單擊刪除時，所有列表視圖不會同時刷新或更新。在刪除所有情況下，服務器已更新但列表視圖未更新。 我正在使用notifyDataSetChanged（）方法。如何解決此問題？

public void alertMessage()
            {
                DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        switch (which){
                            //for cancel button
                            case DialogInterface.BUTTON_POSITIVE:
                                Category_Dashboard_Page activity = (Category_Dashboard_Page) context;
                                activity.swipeCategorylistView.closeAnimate(position);

                                break;
                            //for delete
                            case DialogInterface.BUTTON_NEGATIVE:
                                Category_Dashboard_Page activity1 = (Category_Dashboard_Page) context;
                                activity1.swipeCategorylistView.closeAnimate(position);
                                activity1.categoryList_items_obj.remove(position);
                                activity1.categoryAdapter.notifyDataSetChanged();
                                new DeleteList().execute();
                                break;
                            //for delete all
                            case DialogInterface.BUTTON_NEUTRAL:
                                Category_Dashboard_Page activity2 = (Category_Dashboard_Page) context;
                                activity2.swipeCategorylistView.closeAnimate(position);

                                  for(int i=0;i<categoryList_items_obj.size();i++)
                                   {
                                      Category_Dashboard_Page.CategoryList_Item category_list_item = categoryList_items_obj.get(i);
                                      System.out.println(category_list_item.getCategory_id());

                                      if(category_list_item.getCategory_id().equalsIgnoreCase("all"))
                                      {
                                          categoryList_items_obj.remove(i);
                                      }
                                   }

                               // notifyDataSetChanged();
                                System.out.println(String.valueOf(getCount()));
                                System.out.println(String.valueOf(categoryList_items_obj.size()));
                                activity2.categoryAdapter.notifyDataSetChanged();
                                new DeleteAllList().execute();
                                break;

                        }

                    }
                };
                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setTitle("Are you sure?");
                builder.setMessage("You want to delete this article from all categories.")
                        .setPositiveButton("Cancel ", dialogClickListener)
                        .setNegativeButton("Delete ", dialogClickListener)
                        .setNeutralButton("Delete all", dialogClickListener).show();

            }

Answer 1

您可能要在DeleteList的onPostExecute（）中的相應適配器上調用notifyDataSetChanged（），因為您是通過Aysnc任務從列表中刪除元素的。 讓我知道這是否解決了您的問題。 如果沒有，請分享更多項目代碼。

Answer 2

您還需要從適配器中刪除對象。 嘗試以下代碼-

public void alertMessage()
            {
                DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        switch (which){
                            //for cancel button
                            case DialogInterface.BUTTON_POSITIVE:
                                Category_Dashboard_Page activity = (Category_Dashboard_Page) context;
                                activity.swipeCategorylistView.closeAnimate(position);

                                break;
                            //for delete
                            case DialogInterface.BUTTON_NEGATIVE:
                                Category_Dashboard_Page activity1 = (Category_Dashboard_Page) context;
                                activity1.swipeCategorylistView.closeAnimate(position);
                                activity1.categoryList_items_obj.remove(position);
                                activity1.categoryAdapter.remove(position);
                                activity1.categoryAdapter.notifyDataSetChanged();
                                new DeleteList().execute();
                                break;
                            //for delete all
                            case DialogInterface.BUTTON_NEUTRAL:
                                Category_Dashboard_Page activity2 = (Category_Dashboard_Page) context;
                                activity2.swipeCategorylistView.closeAnimate(position);

                                  for(int i=0;i<categoryList_items_obj.size();i++)
                                   {
                                      Category_Dashboard_Page.CategoryList_Item category_list_item = categoryList_items_obj.get(i);
                                      System.out.println(category_list_item.getCategory_id());

                                      if(category_list_item.getCategory_id().equalsIgnoreCase("all"))
                                      {
                                          categoryList_items_obj.remove(i);
                                          categoryAdapter.remove(i);
                                      }
                                   }

                               // notifyDataSetChanged();
                                System.out.println(String.valueOf(getCount()));
                                System.out.println(String.valueOf(categoryList_items_obj.size()));
                                activity2.categoryAdapter.notifyDataSetChanged();
                                new DeleteAllList().execute();
                                break;

                        }

                    }
                };
                AlertDialog.Builder builder = new AlertDialog.Builder(context);
                builder.setTitle("Are you sure?");
                builder.setMessage("You want to delete this article from all categories.")
                        .setPositiveButton("Cancel ", dialogClickListener)
                        .setNegativeButton("Delete ", dialogClickListener)
                        .setNeutralButton("Delete all", dialogClickListener).show();

            }