public void Activate() { themeLoader = new ThemeLoader(); var mainPage = new ContentPage() { ThemeChangeSensitive = true, AppBar = new AppBar() { AutoNavigationContent = false, Title = "NUI theme sample", //Actions = new View[] { closeButton }, }, Content = new ScrollableBase() { Layout = new LinearLayout() { LinearOrientation = LinearLayout.Orientation.Vertical, CellPadding = new Size2D(20, 20) }, WidthResizePolicy = ResizePolicyType.FillToParent, HeightResizePolicy = ResizePolicyType.FillToParent, Padding = new Extents(30, 30, 20, 20) } }; string[] ids = (string[])themeLoader.QueryIds(); if (ids != null && ids.Contains("org.tizen.default-dark-theme") || ids.Contains("org.tizen.default-light-theme")) { var title = $"Current theme: {(themeLoader.CurrentTheme.Id == "org.tizen.default-dark-theme" ? "Dark" : "Light")}"; mainPage.Content.Add(CreateClickableItem("Theme change", title, delegate(View view) { TextLabel text = view.Children[1] as TextLabel; if (themeLoader.CurrentTheme.Id == "org.tizen.default-dark-theme") { var theme = themeLoader.LoadTheme("org.tizen.default-light-theme"); Tizen.Log.Info("test", $"Id: {theme.Id}, Version: {theme.Version}"); themeLoader.CurrentTheme = theme; text.Text = "Current theme: Light"; } else { var theme = themeLoader.LoadTheme("org.tizen.default-dark-theme"); Tizen.Log.Info("test", $"Id: {theme.Id}, Version: {theme.Version}"); themeLoader.CurrentTheme = theme; text.Text = "Current theme: Dark"; } })); mainPage.Content.Add(CreateItem("Switch", CreateSwitchExample())); } else { mainPage.AppBar.Title = "No proper theme is found!"; } NUIApplication.GetDefaultWindow().GetDefaultNavigator().Push(mainPage); }