Android RecyclerViewAdapter覆盖列表数据

Question

任何人都可以解释一下，为什么在此部分代码中重写List connectionsCategories？我试图过滤放置在RecyclerView内的Filter的performFiltering方法内的数据。如我所见，该列表在此行中采用了新值：connectionsCategoryModelCopy.setValues（filteredConnectionsModels）;

String charString = charSequence.toString();
            filteredConnectionsCategories.clear();
            if (charString.isEmpty()) {
                filteredConnectionsCategories.addAll(connectionsCategories);
            } else {
                List<ConnectionsCategoryModel> filteredList = new ArrayList<>();
                for (ConnectionsCategoryModel connectionsCategoryModel : connectionsCategories) {
                    ConnectionsCategoryModel connectionsCategoryModelCopy = connectionsCategoryModel;
                    List<ConnectionsModel> connectionsModels = connectionsCategoryModelCopy.getValues();
                    List<ConnectionsModel> filteredConnectionsModels = new ArrayList<>();
                    for (ConnectionsModel connectionsModel : connectionsModels) {
                        if (connectionsModel.getName().toLowerCase().replaceAll("\\s", "").contains(charString.toLowerCase().replaceAll("\\s", ""))) {
                            filteredConnectionsModels.add(connectionsModel);
                        }
                    }
                    if (!filteredConnectionsModels.isEmpty()) {
                        connectionsCategoryModelCopy.setValues(filteredConnectionsModels);
                        filteredList.add(connectionsCategoryModelCopy);
                    }
                }
                filteredConnectionsCategories = filteredList;
            }

Answer 1

 ConnectionsCategoryModel connectionsCategoryModelCopy = connectionsCategoryModel;

这行是您的问题。您正在此处制作“浅表副本”。当您获得此列表时：

  List<ConnectionsModel> connectionsModels = connectionsCategoryModelCopy.getValues();

在进行替换调用之前，您需要对每个元素进行“深度复制”。