ArrayList过滤不起作用:安卓

public class CustomFilter extends Filter {
    private ArrayList<String> originalList;
    private ArrayList<String> filteredList;

    public CustomFilter(ArrayList<String> originalList) {
        this.originalList = originalList;
        this.filteredList = new ArrayList<>();
    }

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {
        filteredList.clear();
        final FilterResults results = new FilterResults();

        if (constraint.length() == 0) {
            filteredList.addAll(originalList);
        } else {
            final String filterPattern = constraint.toString().toLowerCase().trim();
            for (String item : originalList) {
                if (item.toLowerCase().contains(filterPattern)) {
                    filteredList.add(item);
                }
            }
        }

        results.values = filteredList;
        results.count = filteredList.size();
        return results;
    }

    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        // 更新ArrayList中的数据
        originalList.clear();
        originalList.addAll((ArrayList<String>) results.values);
        notifyDataSetChanged();
    }
}

ArrayList<String> dataList = new ArrayList<>();
// 添加数据到dataList

CustomFilter filter = new CustomFilter(dataList);
adapter.getFilter().filter("过滤条件");