zumo_2.0_android/app/src/main/res/anim/activity_slide_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
  <translate
    android:duration="300"
    android:fromYDelta="0%p"
    android:interpolator="@android:anim/accelerate_interpolator"
    android:toYDelta="100%p"/>

  <alpha
    android:duration="250"
    android:fromAlpha="1.0"
    android:toAlpha="0.0"/>

</set>