Instantiating Xamarin Forms within an app

We instantiate Xamarin Forms within each supported platform of the app. Xamarin Forms support the following platforms:

• Android

• iOS

• Windows Phone

Android

Typically, an activity to start an activity class looks like this:

public class MyActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
         base.OnCreate(bundle);
         // then whatever you need to do

To start a Xamarin Forms app, this changes as we are not inheriting the Activity but a FormsApplicationActivity, or more precisely:

public class MyActivity : global::Xamarin.Forms.Platform.Android.FormsApplicationActivity
{
    protected override void OnCreate(Bundle bundle)
    {
         base.OnCreate(bundle);
         global::Xamarin.Forms.Forms.Init(this, bundle);
         LoadApplication(new App());
    }
}

iOS

As with Android, we inherit FormsApplicationDelegate in AppDelegate instead of the usual UIApplicationDelegate:

[Register("AppDelegate")]
public partial class AppDelegate...