java/com/android/dialer/theme/res/anim/front_back_switch_button_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<set
  xmlns:android="http://schemas.android.com/apk/res/android">
  <set
    android:ordering="sequentially">
    <objectAnimator
      android:duration="500"
      android:propertyName="rotation"
      android:valueFrom="0.0"
      android:valueTo="-180.0"
      android:valueType="floatType"
      android:interpolator="@android:interpolator/fast_out_slow_in"/>
  </set>
</set>