数组列表中有项目时，过滤器列表过滤器结果没有值

Question

我正在尝试为自定义列表视图创建过滤器，过滤器的结果将继续显示arraylist中的所有项目。在检查了日志之后，我发现filteredList中有itme，但是results.count返回0，这是从“运行”窗口中键入“ a”时的日志： V /清单：沙拉 V /值：0

    @Override
    public Filter getFilter(){
        return customFilter;
    }

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

            if(constraint == null || constraint.length() == 0){
                //filteredList.addAll(arrayList);
                Toast.makeText(getContext(),"NOTHING FOUND",Toast.LENGTH_LONG);
            }else {
                String filterPattern = constraint.toString().toLowerCase().trim();

                for(Favorite item: arrayList){
                    if (item.getTitle().toLowerCase().contains(filterPattern)){
                        filteredList.add(item);
                    }
                }
            }

            Log.v("list",filteredList.get(0).getTitle());
            FilterResults results = new FilterResults();
            results.values = filteredList;
            Log.v("value",Integer.toString(results.count));

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            arrayList2.clear();
            arrayList2.addAll((ArrayList<Favorite>) results.values);
            notifyDataSetChanged();
        }
    };

我称之为过滤器的地方

searchTXT.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
                FavoriteFragment.this.arrayAdapter.getFilter().filter(s);
                arrayAdapter.notifyDataSetChanged();
            }

    @Override
    public void afterTextChanged(Editable s) {
                //filter(s.toString());
            }
});`