Android WebView FullScreen for video

[tekmun]

Description

I am using WebView on Android to playback video. However, the fullscreen icon is grayed out. Based on this article https://docs.microsoft.com/en-us/answers/questions/461524/xamarinandroid-webview-fullscreen-video.html, I have to subclass WebChromeClient and override OnShowCustomView and OnHideCustomView. I tried but it is still grayed out. Any suggestion?

Steps to Reproduce

I can create a project to demonstrate this bug.

Version with bug

Unknown/Other (please specify)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Tried on API 29 and 31

Did you find any workaround?

No workaround

Relevant log output

No response

[VincentBu]

repro with vs main build 32609.239. clicking fullscreen icon doesn't work for me.

[tekmun]

https://github.com/mhaggag/XFAndroidFullScreenWebView For Xamarin Forms and Android, this project shows how to get WebView to show full screen for video content. However, it uses Xamarin.Form's feature to embed native wrapper view. In FullScreenEnabledWebView.cs line 54-61, it opens up a Modal Page using the ContentPage.Content on the Android.Views.View passed from the renderer. It uses the ToVIew() feature to wrap Android.Views.View to Xamarin.Form's ViewWrapper.

page.Content = view.ToView();

When I do that in .Net MAUI, I obtain an Exception error. Can we embed Android native view in .Net MAUI?

Microsoft.Maui.Platform.HandlerNotFoundException Message=Handler not found for view Microsoft.Maui.Controls.Compatibility.Platform.Android.NativeViewWrapper. Source=Microsoft.Maui StackTrace: at Microsoft.Maui.Platform.ElementExtensions.ToHandler(IElement view, IMauiContext context) in D:\a_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 92 at Microsoft.Maui.Platform.ElementExtensions.ToPlatform(IElement view, IMauiContext context) in D:\a_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 142 at Microsoft.Maui.Handlers.ContentViewHandler.UpdateContent(IContentViewHandler handler) in D:\a_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:line 44 at Microsoft.Maui.Handlers.ContentViewHandler.MapContent(IContentViewHandler handler, IContentView page) in D:\a_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:line 49 at Microsoft.Maui.PropertyMapper2.<>c__DisplayClass5_0[[Microsoft.Maui.IContentView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Microsoft.Maui.Handlers.IContentViewHandler, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].<Add>b__0(IElementHandler h, IElement v) in D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:line 183 at Microsoft.Maui.PropertyMapper.UpdatePropertyCore(String key, IElementHandler viewHandler, IElement virtualView) in D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:line 47 at Microsoft.Maui.PropertyMapper.UpdateProperties(IElementHandler viewHandler, IElement virtualView) in D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:line 82 at Microsoft.Maui.Handlers.ElementHandler.SetVirtualView(IElement view) in D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:line 74 at Microsoft.Maui.Handlers.ViewHandler.SetVirtualView(IElement element) in D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandler.cs:line 125 at Microsoft.Maui.Handlers.ViewHandler2[[Microsoft.Maui.IContentView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Microsoft.Maui.Platform.ContentViewGroup, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].SetVirtualView(IView view) in D:\a_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:line 53 at Microsoft.Maui.Handlers.ContentViewHandler.SetVirtualView(IView view) in D:\a_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:line 27 at Microsoft.Maui.Handlers.ViewHandler`2[[Microsoft.Maui.IContentView, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[Microsoft.Maui.Platform.ContentViewGroup, Microsoft.Maui, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].SetVirtualView(IElement view) in D:\a_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:line 56 at Microsoft.Maui.Controls.Element.SetHandler(IElementHandler newHandler) in D:\a_work\1\s\src\Controls\src\Core\HandlerImpl\Element\Element.Impl.cs:line 64 at Microsoft.Maui.Controls.Element.set_Handler(IElementHandler value) in D:\a_work\1\s\src\Controls\src\Core\HandlerImpl\Element\Element.Impl.cs:line 20 at Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler(IElementHandler value) in D:\a_work\1\s\src\Controls\src\Core\HandlerImpl\VisualElement\VisualElement.Impl.cs:line 299 at Microsoft.Maui.Platform.ElementExtensions.ToHandler(IElement view, IMauiContext context) in D:\a_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 109 at Microsoft.Maui.Platform.ElementExtensions.ToPlatform(IElement view, IMauiContext context) in D:\a_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 142 at Microsoft.Maui.Platform.ContainerView.SetView(IElement view, Boolean forceRefresh) in D:\a_work\1\s\src\Core\src\Platform\Android\ContainerView.cs:line 72 at Microsoft.Maui.Platform.ContainerView.set_CurrentView(IElement value) in D:\a_work\1\s\src\Core\src\Platform\Android\ContainerView.cs:line 51 at Microsoft.Maui.Platform.ElementExtensions.ToContainerView(IElement view, IMauiContext context) in D:\a_work\1\s\src\Core\src\Platform\Android\ElementExtensions.cs:line 11 at Microsoft.Maui.Platform.NavigationRootManager.Connect(IView view, IMauiContext mauiContext) in D:\a_work\1\s\src\Core\src\Platform\Android\Navigation\NavigationRootManager.cs:line 49 at Microsoft.Maui.Controls.Platform.ModalNavigationManager.ModalContainer.ModalFragment.OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) in D:\a_work\1\s\src\Controls\src\Core\Platform\ModalNavigationManager\ModalNavigationManager.Android.cs:line 349 at AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_osBundle(IntPtr jnienv, IntPtr native__this, IntPtr native_inflater, IntPtr native_container, IntPtr native_savedInstanceState) in C:\a_work\1\s\generated\androidx.fragment.fragment\obj\Release\net6.0-android\generated\src\AndroidX.Fragment.App.Fragment.cs:line 1999 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L(_JniMarshal_PPLLL_L callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, IntPtr p1, IntPtr p2) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 352

[tchivs]

So what is the solution?

[tekmun]

I have no solution because the sample app in Xamarin Forms use a feature (Native wrapper) that I think is not available in .Net MAUI. I am filing it as a bug report and hope that Microsoft can bring back Native wrapper for .Net MAUI.

[ghost]

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.