<?xml version="1.0" encoding="utf-8"?>
<set
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator" >
    <scale
        android:pivotX="50%"
        android:pivotY="50%"
        android:fromXScale="100%"
        android:fromYScale="100%"
        android:toXScale="50%"
        android:toYScale="50%"
        android:duration="300" />
    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.5"
        android:duration="300"/>
</set>