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

    <item
        android:drawable="@drawable/gradiant_1"
        android:duration="4000" />

    <item
        android:drawable="@drawable/gradiant_2"
        android:duration="4000" />

    <item
        android:drawable="@drawable/gradiant_3"
        android:duration="4000" />

</animation-list>