<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_decelerate_interpolator"
    android:fillAfter="false">

    <translate
        android:fromYDelta="0%p"
        android:toYDelta="100%p"
        android:duration="1000"
        android:repeatCount="infinite"
        android:repeatMode="reverse" />

</set>