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With a copy of the book you get free access to the Git Hub repository containing the workspace with all compiling solutions and source code. In Xamarin Studio we create a new solution of type “Xamarin. For shared code we choose the “Use Shared Library” option. This is all it takes to define the UI of our first cross-platform app. White; Font Size = 50; Background Color = color; Horizontal Text Alignment = Text Alignment. Center; } }, probably the most common layout in Xamarin. Since it allows stacking elements in one direction only, we need to combine multiple stacks hierarchically to obtain the desired result. From Rgb(0.7, 0.8, 1.0)) { Width Request = 70, }); Children. [Activity( Label = "Icons", Configuration Changes = Config Changes. Orientation, Main Launcher = true, Theme = "@android:style/Theme.

And the layout options just take care that it is nicely centered on the page. public class Icon: Label { public Icon(string text, Color color) { Text = text; Text Color = Color. Although you can implement custom renderers with gesture handling, as described in this section about gesture-based interaction, there is a much simpler alternative using a public class Zoomable Web View Renderer: Web View Renderer { protected override void On Element Property Changed(object sender, Property Changed Event Args e) { if (Control ! Nonetheless, you might want to show a so-called launch image while certain preparation needs to be performed in the background. On Android we will need to use some kind of workaround, since launch images are usually not supported.

The Main Page = new Content Page { Padding = new Thickness(0, Device. 20 : 0, 0, 0), Content = new Stack Layout { Children = { new Demo Stack Layout(), new Demo Grid(), new Demo Relative Layout(), new Demo Absolute Layout(), }, }, }; The screenshot shows an overview of the final result. Or even worse: They might be unavailable due to missing internet connection. There are even differences between Android and i OS.

The visual appearance will be almost identical, but the implementation will be conceptually different. But before implementing the renderer, we make sure to add the assembly attribute to link the renderer with the shared UI element public override void Draw(Canvas canvas) { var ball = Element as Ball; var x = ball. Obviously, this method might cause some delay, which affects the user experience. On Element Property Changed(sender, e); } } Some images, like the app icon, the launch image and toolbar icons, are treated a little differently than normal images.

Before looking into each of the four layouts, we define classes for the single visual elements. Main Page = new Tabbed Page { Children = { new Content Page { Title = "Aspect Fill", Content = new Image { Source = Image Source. Aspect Fill, }, }, new Content Page { Title = "Aspect Fit", Content = new Image { Source = Image Source. Aspect Fit, }, }, new Content Page { Title = "Fill", Content = new Image { Source = Image Source. Fill, }, }, }, }; There might be a situation where you want to display an image with pan and zoom functionality. Since app design is out of scope of this guide, we only focus on adding an existing icon to a Xamarin. Current style guides don’t recommend displaying a splash screen on app start, but encourage to speed up the app start as much as possible.



The number of rows or columns would then be automatically derived from the children added afterwards. This might be an advantage for arbitrarily arranged elements, but can also be tedious if one of the previous layouts roughly matches the underlying structure. Since we already added the Xamarin logo as an app icon, the 29-pixel version and the 58-pixel versions are located in the “Resources” folder named “Icon-Small.png” and “[email protected]”.

In the following example we will create a page with four content blocks, each built with one of these layouts. Height); } } and fixes a compiler warning when adding the constructor code given below. This ID is then used to refer to the image: Last but not least, we can refer to an online resource.

Forms’ layout options, two fundamental properties for controlling alignment and expansion of visual elements. Just make sure to set the build action to “Embedded Resource” and assign a Resource ID, “xamarin” in this example.

Those child elements are identical to the ones added to the public class Demo Grid: Grid { public Demo Grid() { Height Request = 70; Row Spacing = 2; Column Spacing = 5; Row Definitions = new Row Definition Collection { new Row Definition(), new Row Definition(), new Row Definition(), }; Column Definitions = new Column Definition Collection { new Column Definition{ Width = new Grid Length(70) }, new Column Definition(), new Column Definition{ Width = new Grid Length(50) }, }; Children. Besides specifying the and horizontal spacing we pre-compute the width of the block with name, subject and body. The latter with the “[email protected]” suffix is automatically used for retina displays.

In this chapter we will have a detailed look into each of these three projects. Forms; namespace Hello Forms { public class App : Application { public App() { Main Page = new Content Page { Content = new Label { Text = "Hello, Forms! Fill And Expand, Children = { new Name("Alice"), new Subject("Meeting on Friday"), new Body("Peter, Let's meet on Friday at 10 am"), }, }); Children. Add(new Time(" AM"), 2, 0); } }public class Demo Relative Layout: Relative Layout { public Demo Relative Layout() { Height Request = 70; const int x Spacing = 5; const int y Spacing = 2; Vertical Options = Layout Options. From Rgb(1.0, 0.8, 0.8)); var name = new Name("Charly"); var subject = new Subject("Re: Request"); var body = new Body("Ok."); var time = new Time(" AM"); Children. Relative To Parent(l = is probably the most powerful layout. On Create(saved Instance State); Set Content View(Resource. Main); } protected override async void On Resume() { base. Run(() = to be the first activity when starting the app.

This not only lets you play with the examples contained in the book, but gives you early access to new demos for future book editions. The new solution contains basically three projects: a shared project with all the cross-platform business logic and UI description as well as two projects with the platform specific integration and customization for Android and i OS devices. The following two sections will show how to integrate this shared project into platform-specific code. Like the main direction of one “email” block the public class Demo Stack Layout: Stack Layout { public Demo Stack Layout() { Height Request = 70; Spacing = 5; Orientation = Stack Orientation. Add(new Stack Layout { Spacing = 2, Width Request = 0, Horizontal Options = Layout Options. Did you already listened to the new album..."), 1, 2); Children. Height); } }public override void Touches Moved(NSSet touches, UIEvent evt) { base. No Title Bar")] public class Launch Activity : Activity { protected override void On Create(Bundle saved Instance State) { base.


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