如何在AutoCompleteTextView项目建议中添加刻度符号？

<AutoCompleteTextView
    android:id="@+id/autoCompleteTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:completionThreshold="1"
    android:dropDownHeight="wrap_content"
    android:dropDownWidth="match_parent"
    android:hint="请输入关键字"
    android:inputType="textAutoComplete"
    android:maxLines="1" />

public class CustomAdapter extends ArrayAdapter<String> {

    private List<String> suggestions;

    public CustomAdapter(Context context, int resource, List<String> objects) {
        super(context, resource, objects);
        suggestions = new ArrayList<>(objects);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_suggestion, parent, false);
        }

        TextView textView = convertView.findViewById(R.id.textViewSuggestion);
        String suggestion = getItem(position);
        if (suggestion != null) {
            textView.setText("● " + suggestion); // 添加刻度符号
        }

        return convertView;
    }

    @NonNull
    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                List<String> filteredSuggestions = new ArrayList<>();

                if (constraint != null) {
                    for (String suggestion : suggestions) {
                        if (suggestion.toLowerCase().startsWith(constraint.toString().toLowerCase())) {
                            filteredSuggestions.add(suggestion);
                        }
                    }

                    filterResults.values = filteredSuggestions;
                    filterResults.count = filteredSuggestions.size();
                }

                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                clear();

                if (results != null && results.count > 0) {
                    addAll((List<String>) results.values);
                }

                notifyDataSetChanged();
            }
        };

        return filter;
    }
}

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/textViewSuggestion"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:textSize="16sp" />

AutoCompleteTextView autoCompleteTextView = findViewById(R.id.autoCompleteTextView);
List<String> suggestions = Arrays.asList("Apple", "Banana", "Cherry", "Durian", "Elderberry");
CustomAdapter adapter = new CustomAdapter(this, R.layout.item_suggestion, suggestions);
autoCompleteTextView.setAdapter(adapter);