兩個view 切換

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="@android:color/white"    android:orientation="vertical" ><RelativeLayout    android:id="@+id/topview"    android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:background="@drawable/title_bg"    android:orientation="horizontal" ><Buttonandroid:layout_marginLeft="5dip"android:layout_marginTop="5dip"android:layout_centerVertical="true"android:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/bt_gohome"android:background="@drawable/calllisthomeclickkk"android:textColor="@android:color/white"/><LinearLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_centerHorizontal="true"    android:layout_centerVertical="true"    android:id="@+id/portal_select_ll"    android:maxWidth="160dp"    android:layout_marginLeft="140dp"    android:background="@drawable/portal_title_seletor"    >    <TextView        android:id="@+id/portal_select_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center"        android:singleLine="true"        android:textColor="@android:color/white"        android:textSize="@dimen/top_title_text_size" />    <ImageView        android:id="@+id/imageView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="5dp"        android:src="@drawable/protal_arrow_down" /></LinearLayout></RelativeLayout>     <RelativeLayout    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:layout_below="@id/topview"        >           <com.jh.jhcs.activity.PortalNewsListView      android:layout_weight="1"        android:id="@+id/listView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:cacheColorHint="#00000000"        android:divider="@null"        ></com.jh.jhcs.activity.PortalNewsListView>   <!--       <LinearLayout     android:layout_width="210dp"    android:layout_height="240dp"    android:layout_centerHorizontal="true"    android:id="@+id/portal_select_lliner"    android:visibility="gone"    android:background="@drawable/frame_gallery_thumb"    >   <ListView     android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:id="@+id/portal_select_listView"    android:fitsSystemWindows="true"    android:cacheColorHint="#00000000"    android:divider="@drawable/portal_select_deviderline"    android:dividerHeight="2dp"   ></ListView>    </LinearLayout>        -->  </RelativeLayout>       </RelativeLayout>