<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/bounce_interpolator" >

    <scale
        android:duration="600"
        android:fromXScale="1"
        android:fromYScale="0.5"
        android:pivotX="50%"
        android:pivotY="0%"
        android:toXScale="1.0"
        android:toYScale="1.0" />

    <alpha
        android:duration="600"
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />

</set>