FairphoneHome/res/anim/menu_activation_zone_disappear.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <alpha
        android:interpolator="@android:anim/decelerate_interpolator"
        android:duration="@integer/config_edgeMenuQuickTime"
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />

</set>