<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="false">
    <!--　Scale是Android的尺寸缩放动画，继承自基类Animation -->
    <scale
        android:duration="500"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="0.8"
        android:toYScale="0.8" />
    <scale
        android:duration="500"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:startOffset="150"
        android:toXScale="1.2"
        android:toYScale="1.2" />
</set>