Android's predictive back feature doesn't use the device's corner radius

Since predictive back is now enabled by default, it would be better to have it polished and match the native behaviour, currently it uses a fixed border radius when the effect is active, which looks bad, Android provided APIs that get the devices corner radius which can be used to achieve a more seamless effect and match the native side.

Current implementation:

in my custom implementation, all I did was use a ClipRRect on a whole page and set the corner radius to the device's using this package corner_radius_plugin, it uses official Android APIs to get the devices corner radius.

the result is a more native behavior:

@MaherSafadii

@MaherSafadii thanks for the report. labelling it as a new proposal.

#166608 #97349 might be related.

Flutter uses a fixed radius for now because device-specific corner radii aren't exposed yet. Once #97349 lands, this code can read the actual device radius instead of the hard-coded value.

flutter/packages/flutter/lib/src/material/predictive_back_page_transitions_builder.dart

Lines 361 to 365 in a5067be

    
           // Ideally this would match the curvature of the physical Android device being 
        
           // used, but that is not yet supported. Instead, this value is a best guess at 
        
           // a value that looks reasonable on most devices. 
        
           // See https://github.com/flutter/flutter/issues/97349. 
        
           static const double _kDeviceBorderRadius = 32.0;

@maRci002

Thank you @maRci002 for the explanation. The issue #97349 is looking for someone to take it on in case anyone is able to! I left a comment there explaining how I think we could solve this.

[Android] Add display corner radii support. (#179219)

[Android] Add display corner radii support. (flutter#179219)

Add displayCornerRadii support to predictive back transitions. (#181326)

Add displayCornerRadii support to predictive back transitions. (flutt…

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

Add displayCornerRadii support to predictive back transitions. (flutt…

Add displayCornerRadii support to predictive back transitions. (#181326)

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Android's predictive back feature doesn't use the device's corner radius #178463

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	// Ideally this would match the curvature of the physical Android device being
	// used, but that is not yet supported. Instead, this value is a best guess at
	// a value that looks reasonable on most devices.
	// See https://github.com/flutter/flutter/issues/97349.
	static const double _kDeviceBorderRadius = 32.0;

Android's predictive back feature doesn't use the device's corner radius #178463

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tirth-patel-nc commented on Nov 14, 2025

maRci002 commented on Nov 14, 2025

justinmc commented on Nov 14, 2025

github-actions commented on Mar 20, 2026

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