Android ListView中headerview的动态显示和隐藏的实现方法

<?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="wrap_content"  android:background="@drawable/item_selector"  android:gravity="center_vertical"  android:orientation="vertical" >  <include    android:id="@+id/view_header"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    layout="@layout/view_header"    android:visibility="gone" />  <LinearLayout    android:id="@+id/view_item"    android:layout_width="match_parent"    android:layout_height="67dip"    android:gravity="center_vertical"    android:minHeight="?android:attr/listPreferredItemHeight"    android:orientation="horizontal" >    ...  </LinearLayout></LinearLayout>