Android SetDecorFitsSystemWindows changes status bar to black on resume

So I'm using Window.SetDecorFitsSystemWindows(false) in onCreate to make my app full screen, the status bar is semi-transparent drawn over my view/activity (which is what I want).

However when I change apps and then switch back to my app, the status bar turns black and my view/activity moves down a little. How do I prevent the status bar changing? I tried calling Window.SetDecorFitsSystemWindows(false) in onResume too but it doesn't make a difference.

I'm using Xamarin if that makes a difference.

This solved my problem for me.

private void ApplyFullScreen()
{
    if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.P)
        Window.Attributes.LayoutInDisplayCutoutMode |= LayoutInDisplayCutoutMode.ShortEdges;

    if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.R)
    {
        Window.SetDecorFitsSystemWindows(false);
        WindowCompat.SetDecorFitsSystemWindows(Window, false);
        var insets = WindowCompat.GetInsetsController(Window, Window.DecorView);
        if (insets != null)
        {
            insets.Hide(WindowInsetsCompat.Type.StatusBars());
            insets.Hide(WindowInsetsCompat.Type.NavigationBars());
            insets.SystemBarsBehavior = WindowInsetsControllerCompat.BehaviorShowTransientBarsBySwipe;
        }
    }
    else
    {
        Window.DecorView.SystemUiFlags = SystemUiFlags.LayoutStable
            | SystemUiFlags.LayoutHideNavigation
            | SystemUiFlags.LayoutFullscreen
            | SystemUiFlags.HideNavigation
            | SystemUiFlags.Fullscreen
            | SystemUiFlags.ImmersiveSticky;
    }
}

protected override void OnResume()
{
    base.OnResume();
    ApplyFullScreen();
}

public override void OnWindowFocusChanged(bool hasFocus)
{
    base.OnWindowFocusChanged(hasFocus);
    if (hasFocus)
    {
        ApplyFullScreen();
    }
}