The current animation was implemented based on the the [full screen surfaces guideline](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#full-screen-surfaces) but in practice it should be more like the [shared element transition](https://developer.android.com/design/ui/mobile/guides/patterns/predictive-back#shared-element-transition). Also see the video [here](https://developer.android.com/guide/navigation/custom-back/support-animations).
The current animation was implemented based on the the full screen surfaces guideline but in practice it should be more like the shared element transition. Also see the video here.