How to force a single page to be displayed in landscape mode?

Question

Hello, I am an amateur developer working on my first Xamarin application. In my situation, I have a page that contains a video and two buttons that I'd like to lock in landscape mode, but I don't want the other pages to also be locked in landscape as well (in fact, most of the rest of the application should be locked in portrait mode)

Can you please give me pointers on how to do that? I've been working with links like:
https://heartbeat.fritz.ai/force-an-orientation-on-a-single-page-in-xamarin-forms-b9c0c5295367

But I cannot get this to work because MessagingCenter "does not exist in the current context" inside MainActivity.cs

A huge thank you in advance

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

MessagingCenter "does not exist in the current context" inside MainActivity.cs

Please copy MessagingCenter is placed below LoadApplication(new App()); like following code.

   [Activity(Label = "App52", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize )]  
       public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity  
       {  
           protected override void OnCreate(Bundle savedInstanceState)  
           {  
               TabLayoutResource = Resource.Layout.Tabbar;  
               ToolbarResource = Resource.Layout.Toolbar;  
               base.OnCreate(savedInstanceState);  
               Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
               global::Xamarin.Forms.Forms.Init(this, savedInstanceState);  
               LoadApplication(new App());  
     
     
               Xamarin.Forms.MessagingCenter.Subscribe<App, string>(App.Current, "AllowLandscape", (snd, arg) =>  
               {  
                   RequestedOrientation = ScreenOrientation.Landscape;  
               });  
               Xamarin.Forms.MessagingCenter.Subscribe<App, string>(App.Current, "PreventLandscape", (snd, arg) =>  
               {  
                   RequestedOrientation = ScreenOrientation.Portrait;  
               });  
     
     
     
           }  
           public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)  
           {  
               Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
     
               base.OnRequestPermissionsResult(requestCode, permissions, grantResults);  
           }  
       }  

Then, copy following code in the Forms contentpage.

   protected override void OnAppearing()  
           {  
               base.OnAppearing();  
     
               MessagingCenter.Send<App, string>((App)App.Current, "AllowLandscape", "");  
           }  
     
           protected override void OnDisappearing()  
           {  
               base.OnDisappearing();  
     
               MessagingCenter.Send<App, string>((App)App.Current, "PreventLandscape", "");  
           }  

Best Regards,

Leon Lu

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