Maui全屏显示

安卓
安卓10以上系统，在MainActivity.cs文件中重写OnCreate方法。参考安卓官方文档。

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 protected override void OnCreate(Bundle? savedInstanceState)
 {
     base.OnCreate(savedInstanceState);
     WindowInsetsControllerCompat windowInsetsController = WindowCompat.GetInsetsController(Window, Window.DecorView);
     // 设置从上下滑动显示状态栏的行为
     windowInsetsController.SystemBarsBehavior = WindowInsetsControllerCompat.BehaviorShowTransientBarsBySwipe;
     // 隐藏状态栏
     windowInsetsController.Hide(WindowInsetsCompat.Type.SystemBars());
 }

安卓12系统，在MainActivity.cs文件中重写OnCreate方法。

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 protected override void OnCreate(Bundle? savedInstanceState)
 {
     base.OnCreate(savedInstanceState);
     // 全屏显示(会隐藏顶部状态栏但是无法隐藏底部导航栏)
     Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);
     // 隐藏底部导航栏(可以通过从下向上滑动显示导航栏)
     Window.DecorView.SystemUiFlags = SystemUiFlags.HideNavigation;
 }

在MainActivity.cs文件中添加如下代码。如不需要显示下部的导航条可以在设置-无障碍-开启隐藏状态栏(安卓10)。

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private void SetWindowLayout()
        {
            if (Window != null)
            {
                if (Build.VERSION.SdkInt >= BuildVersionCodes.R)
                {
#pragma warning disable CA1416

                    IWindowInsetsController wicController = Window.InsetsController;


                    Window.SetDecorFitsSystemWindows(false);
                    Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

                    if (wicController != null)
                    {
                        wicController.Hide(WindowInsets.Type.Ime());
                        wicController.Hide(WindowInsets.Type.NavigationBars());
                        wicController.Hide(WindowInsets.Type.SystemOverlays());
                        wicController.Hide(WindowInsets.Type.StatusBars());
                        wicController.Hide(WindowInsets.Type.MandatorySystemGestures());
                        wicController.Hide(WindowInsets.Type.CaptionBar());
                    }
#pragma warning restore CA1416
                }
                else
                {
#pragma warning disable CS0618

                    Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

                    Window.DecorView.SystemUiVisibility = (StatusBarVisibility)(SystemUiFlags.Fullscreen |
                                                                                 SystemUiFlags.HideNavigation |
                                                                                 SystemUiFlags.Immersive |
                                                                                 SystemUiFlags.ImmersiveSticky |
                                                                                 SystemUiFlags.LayoutHideNavigation |
                                                                                 SystemUiFlags.LayoutStable |
                                                                                 SystemUiFlags.LowProfile);
#pragma warning restore CS0618
                }
            }
        }

        protected override void OnCreate(
            Bundle bSavedInstanceState)
        {
            base.OnCreate(bSavedInstanceState);
            SetWindowLayout();
        }

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    protected override void OnCreate(
            Bundle bSavedInstanceState)
    {
        base.OnCreate(bSavedInstanceState);
        SetWindowLayout();
        //if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.R)
        //{
        //    Window.SetDecorFitsSystemWindows(false);
        //    var windowInsetsController = Window.DecorView.WindowInsetsController;
        //    if (windowInsetsController != null)
        //    {
        //        windowInsetsController.Hide(WindowInsetsCompat.Type.NavigationBars());
        //    }
        //}
        //else
        //{
        //    var uiOptions = SystemUiFlags.HideNavigation;
        //    Window.DecorView.SystemUiFlags = SystemUiFlags.HideNavigation;// (StatusBarVisibility)uiOptions;
        //}
    }

    private void SetWindowLayout()
    {
        if (Window != null)
        {
            if (Build.VERSION.SdkInt >= BuildVersionCodes.R)
            {
#pragma warning disable CA1416

                IWindowInsetsController wicController = Window.InsetsController;


                Window.SetDecorFitsSystemWindows(false);
                Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

                if (wicController != null)
                {
                    wicController.Hide(WindowInsets.Type.Ime());
                    wicController.Hide(WindowInsets.Type.NavigationBars());
                    //wicController.Hide(WindowInsets.Type.SystemOverlays());
                    wicController.Hide(WindowInsets.Type.StatusBars());
                    wicController.Hide(WindowInsets.Type.MandatorySystemGestures());
                    wicController.Hide(WindowInsets.Type.CaptionBar());
                }
#pragma warning restore CA1416
            }
            else
            {
#pragma warning disable CS0618
// 界面有任何变化时都重新设置全屏
                Window.DecorView.SystemUiVisibilityChange += DecorView_SystemUiVisibilityChange;
                Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

                Window.DecorView.SystemUiFlags = (/*SystemUiFlags.Fullscreen | */SystemUiFlags.HideNavigation /*| SystemUiFlags.Immersive | SystemUiFlags.ImmersiveSticky *//*| SystemUiFlags.LayoutHideNavigation*/ /*| SystemUiFlags.LayoutStable | SystemUiFlags.LowProfile*/);
#pragma warning restore CS0618
            }
        }
    }

    private void DecorView_SystemUiVisibilityChange(object? sender, Android.Views.View.SystemUiVisibilityChangeEventArgs e)
    {
        Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);
        Window.DecorView.SystemUiFlags = (/*SystemUiFlags.Fullscreen | */SystemUiFlags.HideNavigation /*| SystemUiFlags.Immersive | SystemUiFlags.ImmersiveSticky*/ /*| SystemUiFlags.LayoutHideNavigation | SystemUiFlags.LayoutStable*/ /*| SystemUiFlags.LowProfile*/);
    }

Windows