res/anim/slideshow_in.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
        android:interpolator="@android:interpolator/decelerate_quad"
        android:fromAlpha="0.0" android:toAlpha="1.0"
        android:duration="1500" />