Implement Full-Screen Mode in .NET MAUI Apps

Android
For Android 10 and above, override the OnCreate method in the MainActivity.cs file. Refer to the Android official documentation.

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protected override void OnCreate(Bundle? savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    WindowInsetsControllerCompat windowInsetsController = WindowCompat.GetInsetsController(Window, Window.DecorView);
    // Set the behavior for showing the status bar by swiping
    windowInsetsController.SystemBarsBehavior = WindowInsetsControllerCompat.BehaviorShowTransientBarsBySwipe;
    // Hide the status bar
    windowInsetsController.Hide(WindowInsetsCompat.Type.SystemBars());
}

For Android 12, override the OnCreate method in the MainActivity.cs file.

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protected override void OnCreate(Bundle? savedInstanceState)
{
    base.OnCreate(savedInstanceState);
    // Full-screen display (hides the top status bar but not the bottom navigation bar)
    Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);
    // Hide the bottom navigation bar (can be shown by swiping up)
    Window.DecorView.SystemUiFlags = SystemUiFlags.HideNavigation;
}

Add the following code in the MainActivity.cs file. If the bottom navigation bar is not needed, you can enable the “Hide Status Bar” option in Settings > Accessibility (Android 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();
}

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.StatusBars());
                wicController.Hide(WindowInsets.Type.MandatorySystemGestures());
                wicController.Hide(WindowInsets.Type.CaptionBar());
            }
#pragma warning restore CA1416
        }
        else
        {
#pragma warning disable CS0618
            Window.DecorView.SystemUiVisibilityChange += DecorView_SystemUiVisibilityChange;
            Window.SetFlags(WindowManagerFlags.Fullscreen, WindowManagerFlags.Fullscreen);

            Window.DecorView.SystemUiFlags = (SystemUiFlags.HideNavigation);
#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.HideNavigation);
}