<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:zAdjustment="normal">
    <alpha
        android:duration="250"
        android:fillAfter="true"
        android:fillBefore="true"
        android:fillEnabled="true"
        android:fromAlpha="0.7"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toAlpha="1.0"/>
</set>