Enter animation demo: Slide from bottom demo

item_animation_from_bottom.xml

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

    <translate
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:fromYDelta="50%p"
        android:toYDelta="0"
        />

    <alpha
        android:fromAlpha="0"
        android:toAlpha="1"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        />

</set>

layout_animation_from_bottom.xml

<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:animation="@anim/item_animation_from_bottom"
    android:delay="15%"
    android:animationOrder="normal"
    />

The file "layout_animation_from_bottom.xml" has a syntax error in it -> version and encoding are not strings. This is how it's supposed to look like:

<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:animation="@anim/item_animation_from_bottom"
    android:delay="15%"
    android:animationOrder="normal"
/>

Even though you posted a comment with the updated version, your proandroiddev article doesn't reflect that crucial change, this is what the article displays:

<?xml version=1.0 encoding=utf-8?>
<layoutAnimation
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:animation="@anim/item_animation_from_bottom"
    android:delay="15%"
    android:animationOrder="normal"
/>