Gallery问题

The following classes could not be found:
- Gallery (Change to android.widget.Gallery, Fix Build Path, Edit XML)
xml代码：
<?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"
    android:background="@drawable/xi"
    android:orientation="vertical" >    <ImageSwitcher
        android:id="@+id/switch2"
        android:layout_width="320dp"
        android:layout_height="wrap_content" />    <Gallery
        android:id="@+id/mygallery"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:spacing="3pt"
        android:unselectedAlpha="0.5" />    <Button
        android:id="@+id/viewgoback"
        style="@style/btn1" /></LinearLayout>求解