feat: Add built-in support for OnBackPressedCallback on Android #22178

Copilot · 2025-12-18T15:18:22Z

Understand the issue: Android predictive back gesture requires proactive declaration of back handling capability
Revert SystemNavigationManager to original API surface (removed BackHandlerRequired, HasBackRequestedSubscribers)
Update native Android ApplicationActivity to enable OnBackPressedCallback only when AppViewBackButtonVisibility is Visible
Update Skia Android ApplicationActivity with the same pattern
Update documentation to explain the correct usage pattern for predictive back gesture
Build verification for both native and Skia Android targets

Key changes based on feedback:

The OnBackPressedCallback is now enabled only when AppViewBackButtonVisibility == Visible
This follows Android's predictive back gesture requirement of proactively declaring back handling capability
Apps must set AppViewBackButtonVisibility = Visible when they can handle back navigation

Original prompt

This section details on the original issue you should resolve

<issue_title>Add built-in support for OnBackPressedCallback on Android</issue_title>
<issue_description>

What would you like to be added:

Currently we use the OnBackPressed handler on Android, which is now deprecated. Instead OnBackPressedCallback should be used, which however has a different handling approach - when it is registered, you are required to handle the back press (so there is no way to decide whether the back press will be handled when it is already being executed). We will probably need some new API for this to let user register/unregister the callback on demand - and something which will also work as a replacement of SystemNavigationManager on other targets (e.g. WinAppSDK, where SystemNavigationManager does not exist).

It seems the Application Activity's DispatchKeyEvent for the back button is triggered before the callback, which could be an opportunity to trigger the SystemNavigationManager and handle it there, but it is not going to be able to handle the back gesture probably.

Create a new API that will fit this new approach of explicitly registering a callback when the app can go back in-app.

Why is this needed:

For which Platform:

WebAssembly

Android

iOS

macOS (AppKit)

Mac Catalyst

Skia

WPF

GTK (Linux)

Linux Framebuffer

Tizen

Windows

Build tasks

Solution Templates

Anything else we need to know?

</issue_description>

Comments on the Issue (you are @copilot in this section)
@MartinZikmund This is now very urgent, as Android 36 devices now do not trigger `OnBackPressed` at all, meaning all current Uno apps using `SystemNavigationManager` will always close on back button press/gesture.

Fixes Add built-in support for OnBackPressedCallback on Android #11748

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Co-authored-by: MartinZikmund <[email protected]>

CLAassistant · 2025-12-18T15:39:57Z

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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Co-authored-by: MartinZikmund <[email protected]>

unodevops · 2025-12-18T16:10:11Z

🤖 Your WebAssembly Skia Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-22178/wasm-skia-net9/index.html

unodevops · 2025-12-18T16:17:04Z

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-22178/docs/index.html

MartinZikmund · 2025-12-18T17:41:29Z

@copilot this solution is not correct, as mentioned here https://stackoverflow.com/a/75462987 the point of predictive back gesture that it is enabled/disabled ahead of time and when the callback is executed it already is clear that the app is able to handle the gesture. Therefore a new API is needed. Something like "CanHandleBack" and "BackRequested" duo

Co-authored-by: MartinZikmund <[email protected]>

Copilot · 2025-12-18T18:24:52Z

@copilot this solution is not correct, as mentioned here https://stackoverflow.com/a/75462987 the point of predictive back gesture that it is enabled/disabled ahead of time and when the callback is ex...

You're right. I've updated the implementation in commit 8484df5 to follow the correct predictive back gesture pattern:

The OnBackPressedCallback is now enabled only when AppViewBackButtonVisibility == Visible
Removed the BackHandlerRequired event and HasBackRequestedSubscribers property from SystemNavigationManager
Apps must proactively set AppViewBackButtonVisibility = Visible when they can handle back navigation

This aligns with Android's requirement that the callback state must be declared ahead of time, before the user starts the gesture.

unodevops · 2025-12-18T18:45:21Z

⚠️⚠️ The build 189069 has failed on Uno.UI - docs.

nventive-devops · 2025-12-18T18:49:31Z

The build 189021 found UI Test snapshots differences: android-28-net9: 17, android-28-net9-Snap: 37, ios: 2, ios-Snap: 55, skia-linux-screenshots: 60, skia-windows-screenshots: 122, wasm: 106, wasm-automated-net10.0-WinUI-Benchmarks-automated: 1, wasm-automated-net10.0-WinUI-Default-automated: 10, wasm-automated-net10.0-WinUI-RuntimeTests-0: 0, wasm-automated-net10.0-WinUI-RuntimeTests-1: 0, wasm-automated-net10.0-WinUI-RuntimeTests-2: 0

Details

android-28-net9: 17 changed over 825
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wasm-automated-net10.0-WinUI-RuntimeTests-2: 0 changed over 1

nventive-devops · 2025-12-19T01:41:48Z

The build 189070 found UI Test snapshots differences: android-28-net9: 15, android-28-net9-Snap: 41, ios: 3, ios-Snap: 38, skia-linux-screenshots: 65, skia-windows-screenshots: 677, wasm: 117, wasm-automated-net10.0-WinUI-Benchmarks-automated: 1, wasm-automated-net10.0-WinUI-Default-automated: 16, wasm-automated-net10.0-WinUI-RuntimeTests-0: 0, wasm-automated-net10.0-WinUI-RuntimeTests-1: 0, wasm-automated-net10.0-WinUI-RuntimeTests-2: 0

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- ContentPresenter_TextProperties.png-dark
- ContentControl_WithPadding.png-dark
wasm: 117 changed over 1059
🚨🚨 Comparison Details (first 20) 🚨🚨
- UITests.Shared.Microsoft_UI_Xaml_Controls.WebView2Tests.WebView2_NavigateToString2
- UITests.Shared.Windows_UI_Xaml_Controls.CommandBar.CommandBar_Xaml_Automated
- UITests.Shared.Windows_UI_Xaml_Controls.PasswordBoxTests.PasswordBoxPage
- UITests.Shared.Windows_UI_Xaml_Controls.Pivot.Pivot_CustomContent_Automated
- UITests.Windows_UI_Notifications.BadgeNotificationTests
- UITests.Windows_UI_Xaml_Media.FontTests.DynamicFont
- MUXControlsTestApp.NavigationViewMenuItemStretchPage
- UITests.Shared.Windows_UI.Xaml_Automation.AutomationProperties_AutomationId
- UITests.Windows_UI_Xaml_Controls.TextBlockControl.TextBlock_IsTextSelectionEnabled
- UITests.Windows_UI_Xaml_Controls.TextBlockControl.TextBlock_LayoutAlignment
- SamplesApp.Wasm.Windows_UI_Xaml_Controls.ComboBox.ComboBox_PlaceholderText
- SamplesApp.Windows_UI_Xaml_Shapes.PathTestsControl.Path_Dynamic
- UITests.Shared.Windows_UI_Xaml_Controls.TextBoxTests.TextBox_CharacterCasing
- UITests.Shared.Windows_UI_Xaml_Controls.TextBoxTests.TextBox_Disabled
- UITests.Shared.Windows_UI_Xaml_Controls.TextBoxTests.TextBox_Formatting_Flicker
- UITests.Shared.Windows_UI_Xaml_Controls.TextBoxTests.TextBox_IsReadOnly_AcceptsReturn
- UITests.Windows_UI_Xaml.Performance.Performance_1000ButtonsContinuousRendering
- UITests.Windows_UI_Xaml_Controls.PasswordBoxTests.PasswordBox_AutoFill
- UITests.Windows_UI_Xaml_Controls.ViewBoxTests.Viewbox_Behavior
- UITests.Windows_UI_Xaml_Input.Keyboard.Keyboard_Events
wasm-automated-net10.0-WinUI-Benchmarks-automated: 1 changed over 1
🚨🚨 Comparison Details (first 20) 🚨🚨
- RunBenchmarks_Benchmarks_Shared_Controls_BenchmarkDotNetTestsPage
wasm-automated-net10.0-WinUI-Default-automated: 16 changed over 877
🚨🚨 Comparison Details (first 20) 🚨🚨
- Default_StrokeThickness_MyLine
- Default_StrokeThickness_MyPath
- When_NoSelectionWithItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- When_SingleSelectionWithoutItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- Default_StrokeThickness_MyPolygon
- ListView_SelectedItems_SamplesApp_Windows_UI_Xaml_Controls_ListView_ListViewSelectedItems
- When_StretchAndAlignmentNone_ImageBrush-50-50-None-XLeft-YBottom
- Default_StrokeThickness_MyRect
- When_NoSelection_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- TestProgressRing_InitialState_UITests_Microsoft_UI_Xaml_Controls_ProgressRing_WinUIProgressRing_Features
- Default_StrokeThickness_MyEllipse
- Default_StrokeThickness_MyPolyline
- When_TransformToVisual_ScrollViewer_UITests_Shared_Windows_UI_Xaml_UIElementTests_TransformToVisual_ScrollViewer
- When_MultipleSelectionWithoutItemClick_Then_PointersEvents_UITests_Windows_UI_Xaml_Controls_ListView_ListView_Selection_Pointers
- When_Theme_Changed_No_Crash_UITests_Windows_UI_Xaml_Controls_CalendarView_CalendarView_Theming
- SequentialAnimations_SamplesApp_Windows_UI_Xaml_Media_Animation_SequentialAnimationsPage
wasm-automated-net10.0-WinUI-RuntimeTests-0: 0 changed over 1
wasm-automated-net10.0-WinUI-RuntimeTests-1: 0 changed over 1
wasm-automated-net10.0-WinUI-RuntimeTests-2: 0 changed over 1

unodevops · 2025-12-19T01:50:32Z

⚠️⚠️ The build 189070 has failed on Uno.UI - CI.

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b69cd9e

Copilot AI assigned Copilot and MartinZikmund Dec 18, 2025

Copilot started work on behalf of MartinZikmund December 18, 2025 15:18 View session

feat: Add built-in support for OnBackPressedCallback on Android

e34d685

Co-authored-by: MartinZikmund <[email protected]>

docs: Fix version references in Android back button support comments

15ec0c9

Co-authored-by: MartinZikmund <[email protected]>

Copilot AI changed the title ~~[WIP] Add built-in support for OnBackPressedCallback on Android~~ feat: Add built-in support for OnBackPressedCallback on Android Dec 18, 2025

Copilot AI requested a review from MartinZikmund December 18, 2025 15:45

Copilot finished work on behalf of MartinZikmund December 18, 2025 15:45

Copilot started work on behalf of MartinZikmund December 18, 2025 17:42 View session

fix: Use AppViewBackButtonVisibility for predictive back gesture control

8484df5

Co-authored-by: MartinZikmund <[email protected]>

Copilot finished work on behalf of MartinZikmund December 18, 2025 18:27

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feat: Add built-in support for OnBackPressedCallback on Android #22178

feat: Add built-in support for OnBackPressedCallback on Android #22178

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feat: Add built-in support for OnBackPressedCallback on Android #22178

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