popwindow中的listview怎麼實現下拉重新整理　　package com.npt.caronline;import java.util.ArrayList;import java.util.List;　　import android.content.Context;import android.graphics.drawable.BitmapDrawable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.TextView;public class PopMenu {private ArrayList