With Android 15 enabling predictive back by default, these Google apps will show a preview of the homescreen as you swipe back.
The shrinking of the current window lets people confirm that they’re exiting the app, thus preventing accidental closures. This works when swiping from the left or right edge of the screen. This has been a multi-year effort for Google that started in Android 13 and is finally being enabled by default in Android 15 after previously requiring a Developer option.
Meanwhile, there’s also in-app predictive back where developers can create custom transitions/animations. For example, Gmail has an implementation when going from an email back to your inbox, while Google Calendar does the same when closing an event.
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