有没有简单的方法来设定的2的TextView下拉到AutoCompleteTextView。

Is there any simple way to set a 2 TextView dropdown to an AutoCompleteTextView.

有 android.R.layout.two_line_list_item 这我找不到任何例子如何使用。

There is android.R.layout.two_line_list_item Which I couldn't find any examples how to use.

所以，我想这样的：

public class TwoLineDropdownAdapter extends BaseAdapter {

    private LayoutInflater mInflater = null;
    private Activity activity;
    public ArrayList<TwoLineDropDown> values = new ArrayList<TwoLineDropDown>();

    public TwoLineDropdownAdapter(Activity a, ArrayList<TwoLineDropDown> items) {

        values = items;
        activity = a;
        mInflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public int getCount() {

        return values.size();
    }

    public TwoLineDropDown getItem(int position) {

        return values.get(position);
    }

    public long getItemId(int position) {

        return position;
    }

    public static class ViewHolder {

        public TextView title;
        public TextView description;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {

        ViewHolder holder;

        if (convertView == null) {

            holder = new ViewHolder();

            convertView = mInflater.inflate(R.layout.dropdown_text_twoline,
                    parent, false);
            holder.title = (TextView) convertView
                    .findViewById(R.id.text1);
            holder.description = (TextView) convertView
                    .findViewById(R.id.text2);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        return convertView;
    }

    public void add(TwoLineDropDown ei) {

        values.add(ei);
    }
}

但是，我面临着一个问题就在这里：

TwoLineDropdownAdapter AutoCompleteAdapter = new TwoLineDropdownAdapter(this, items);
myAutoComplete.setAdapter(AutoCompleteAdapter);

在设置适配器，它说：

约束不匹配：通用方法setAdapter型（T）   AutoCompleteTextView是不适用的参数   （TwoLineDropdownAdapter）。推断的类型TwoLineDropdownAdapter是   为界参数不是一个有效的替代品

Bound mismatch: The generic method setAdapter(T) of type AutoCompleteTextView is not applicable for the arguments (TwoLineDropdownAdapter). The inferred type TwoLineDropdownAdapter is not a valid substitute for the bounded parameter

如何解决此问题？

感谢您

推荐答案

根据该文件，推断的类型setAdapter在AutoCompleteTextView是：

According to the documentation, the inferred type of setAdapter in AutoCompleteTextView is :

<T extends ListAdapter & Filterable> void setAdapter(T adapter)

您适配器必须是ListAdapter（这BaseAdapter是，到目前为止一切顺利）和过滤的，这BaseAdapter不是，也不是你的适配器实现。我将延长一个ArrayAdapter，这是过滤的，更何况是将简化你的实现（你的一些方法复制ArrayAdapter的相同结果的方法）：

Your adapter must be a ListAdapter (which BaseAdapter is, so far so good) and a Filterable, which BaseAdapter is not, nor is your Adapter implementation. I would extend an ArrayAdapter, which is Filterable, not to mention is would simplify your implementation (some of your methods duplicate methods of ArrayAdapter for the same result) :

public class TwoLineDropdownAdapter extends ArrayAdapter<TwoLineDropDown> {

    private LayoutInflater mInflater = null;
    private Activity activity;

    public TwoLineDropdownAdapter(Activity a, ArrayList<TwoLineDropDown> items) {
        super(a, 0, items);
        activity = a;
        mInflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public static class ViewHolder {

        public TextView title;
        public TextView description;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {

        ViewHolder holder;

        if (convertView == null) {

            holder = new ViewHolder();

            convertView = mInflater.inflate(R.layout.dropdown_text_twoline,
                    parent, false);
            holder.title = (TextView) convertView
                    .findViewById(R.id.text1);
            holder.description = (TextView) convertView
                    .findViewById(R.id.text2);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        return convertView;
    }
}