在 RecyclerView 中使用 Spinner 过滤自定义 ArrayList 正在清除整个列表

Question

我正在尝试根据直径过滤项目列表。直径位于作为自定义对象元素的产品名称字符串中。到目前为止，当我从微调器中选择一个直径时，它正在清除列表中的每个项目。

微调逻辑

 //Spinner
        diameterSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Object diameterFilter = spinnerAdapter.getItem(position);
                dAdapter.getFilter().filter(diameterFilter.toString());
                dAdapter.notifyDataSetChanged();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

适配器上的过滤代码

    //FILTER
    @Override
    public Filter getFilter() {
        return displayFilter;
    }

    private Filter displayFilter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            List<Inventory> filteredList = new ArrayList<>();

            if (constraint == null || constraint.length() == 0){
                filteredList.addAll(displayedListFull);
            }else {
                String filterPattern = constraint.toString().toLowerCase().trim();


                for (Inventory item : displayedListFull){
                    if (item.getProductName().toLowerCase().contains(filterPattern)){
                        filteredList.add(item);
                    }
                }
            }
            FilterResults results = new FilterResults();
            results.values = filteredList;
            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            displayedList.clear();
            displayedList.addAll((List)results.values);
            notifyDataSetChanged();
        }
    };

Answer 1

在微调器回调中将getItem 更改为getItemAtPosition

diameterSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        Object diameterFilter = spinnerAdapter.getItemAtPosition(position); // here is the change
        dAdapter.getFilter().filter(diameterFilter.toString());
        dAdapter.notifyDataSetChanged();
    }

// rest of your code