Androidでpopuwindowでlistviewを使う

Androidでは、簡単なpopuwindowではビジネスのニーズを満たすことができません.popuwindowを使用してlistviewをインストールしてデータを表示することができます.
まずpopuwindowレイアウトを定義します.listview、上コードです.

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/lv_appointment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorWhite">ListView>

LinearLayout>

それからActivityで方法を定義します:私のここのレイアウトの中で2つの矢印があって、1つは1つの隠しを表示して、した処理、以下のようにします

/**
 *   popuwindow
 *
 * @param parent
 */
private void showWindow(View parent) {
    LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = layoutInflater.inflate(R.layout.activity_reservation_popuwindow, null);
    ListView lv_appointment = (ListView) view.findViewById(R.id.lv_appointment);
    if (datas != null) {
        adapter = new MyAdapter(datas);
    }
    lv_appointment.setAdapter(adapter);

    //     PopuWidow  ,    
    popupWindow = new PopupWindow(view, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);

    //     ,   
    popupWindow.setFocusable(true);
    //           
    popupWindow.setOutsideTouchable(true);

    //  SelectPicPopupWindow        
    popupWindow.setAnimationStyle(R.style.AnimationFade);

    //        “  Back”      ，           
    popupWindow.setBackgroundDrawable(new BitmapDrawable());
    WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

    popupWindow.showAtLocation(parent, Gravity.BOTTOM, 0, 0);
    //  ppopuwindow     
    popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
        @Override
        public void onDismiss() {
            iv_down.setVisibility(View.VISIBLE);
            iv_up.setVisibility(View.GONE);
            isShow=true;
        }
    });

    //listview        
    lv_appointment.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView> adapterView, View view, int i, long l) {
            if (popupWindow != null) {
                popupWindow.dismiss();
                tv_appointment.setText(datas.get(i));

                iv_down.setVisibility(View.VISIBLE);
                iv_up.setVisibility(View.GONE);
                isShow = true;

            }
        }
    });

}

Listviewのアダプタ

class MyAdapter extends BaseAdapter {


    private String tvName;

    public MyAdapter(List datas) {

    }

    @Override
    public int getCount() {

        return datas.size();
    }

    @Override
    public Object getItem(int i) {
        return datas.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;

        if (convertView == null) {

            convertView = View.inflate(context, R.layout.activty_appointment_list_item, null);
            holder = new ViewHolder();
            holder.name = (TextView) convertView.findViewById(R.id.bound_account_list_item_name);
            //  
            convertView.setTag(holder);

        } else {

            holder = (ViewHolder) convertView.getTag();

        }
        tvName = datas.get(position);
        holder.name.setText(tvName);

        return convertView;
    }
}

class ViewHolder {
    TextView name;
}

//コレクション、データの追加

private List datas = new ArrayList<>();

//    
datas.add("  ");
datas.add("  ");
datas.add("  ");

良いアドバイスがあれば教えていただけますが・・・