AutoCompleteTextView自定义过滤器结果将被忽略

Question

我已经为AutoCompleteTextView创建了自定义适配器。

package ...

import ...

public class CardSuggestionAdapter extends ArrayAdapter<String> implements Filterable {

    private final LayoutInflater mInflater;
    private Activity context;
    private int mFieldId, mResource;

    CardSuggestionAdapter(Activity context, String[] names) {
        super(context, R.layout.card_suggestion, R.id.name_label, names);
        this.context = context;
        this.mFieldId = R.id.name_label;
        this.mResource = R.layout.card_suggestion;
        this.mInflater = LayoutInflater.from(context);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        return createViewFromResource(mInflater, position, convertView, parent, mResource);
    }

    @NonNull
    @Override
    public Filter getFilter() {
        return new CardsFilter();
    }

    private View createViewFromResource(@NonNull LayoutInflater inflater, int position, @Nullable
            View convertView, @NonNull ViewGroup parent, int resource) {
        View view = convertView;
        final TextView text;

        ViewHolder viewHolder;
        if (convertView == null) {
            view = inflater.inflate(resource, parent, false);
            viewHolder = new ViewHolder(view);
            view.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) view.getTag();
        }
        text = view.findViewById(mFieldId);
        if (text == null) {
            throw new RuntimeException("Failed to find view with ID "
                    + context.getResources().getResourceName(mFieldId)
                    + " in item layout");
        }

        final String item = getItem(position);
        viewHolder.name.setText(item);
        viewHolder.name.setTypeface(Typeface.createFromAsset(
                MarsPDA.assetManager, "fonts/prototype.ttf"));

        return view;
    }

    class ViewHolder {

        TextView name;

        ViewHolder(View v) {
            name = v.findViewById(R.id.name_label);
        }
    }

    private class CardsFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if (constraint != null) {
                final List<String> suggestions = new ArrayList<>();
                final FilterResults fs = new FilterResults();
                return fs;
            } else {
                return new FilterResults();
            }
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            if (results != null && results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}

performFiltering的此实现显然使得没有显示建议。

[我尝试从原始performFiltering类复制ArrayAdapter方法，并研究了在该论坛上发现的Filter的其他一些实现，但是，即使我实际上从字面上将任何内容添加到suggestions列表并设置了fs.values = suggestions;和fs.count = suggestions.size();，适配器也会显示传递给构造函数的names数组的所有成员。为什么会这样？

Answer 1

我认为问题出在管理列表中，您可以尝试以下更改声明原始列表和过滤器，然后在构造函数中对其进行初始化。