Finally got the solution. It works for me and could be helpful to others. The key was to put the android:interpolator tag in the animation set.
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/bounce_interpolator" >
<scale
android:duration="600"
android:fromXScale="1"
android:fromYScale="0.5"
android:pivotX="50%"
android:pivotY="0%"
android:toXScale="1.0"
android:toYScale="1.0" />
<alpha
android:duration="600"
android:fromAlpha="0.0"
android:toAlpha="1.0" />
</set>