A sample that is focused on the correct usage of backpress events.
All the back press events are flowed from activity to fragments & their child fragments (if any). This is done by calling canGoBack on navigator to determine if it's okay to go back. Once all the fragments return False i.e there is no fragment in the backstack of the activity or any child fragment, the host's (activity) super.onBackPressed() is called.
The sample also focus on a specific animation CircularTransform, for eg: take a look at the sample app gif.
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Apps can be creative & can use this transition to change theme as well. For eg: Moviesy does it like the following.
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