text: <?xml version="1.0" encoding="utf-8"?>
  <set xmlns:android="http://schemas.android.com/apk/res/android"
      android:interpolator="@android:anim/bounce_interpolator"
      android:repeatMode="restart"
      android:repeatCount="infinite">
      <objectAnimator
          android:startOffset="200"
          android:interpolator="@android:anim/accelerate_interpolator"
          android:duration="300"
          android:propertyName="translateY"
          android:valueFrom="0"
          android:valueTo="10" />
      <objectAnimator
          android:interpolator="@android:anim/decelerate_interpolator"
          android:startOffset="500"
          android:duration="300"
          android:propertyName="translateY"
          android:valueFrom="10"
          android:valueTo="0" />
  
  </set>