如何从Xamarin表单页面启动Android活动？

public interface IAndroidActivityLauncher
{
    void StartActivity();
}

[assembly: Dependency(typeof(AndroidActivityLauncher))]
namespace YourNamespace.Droid
{
    public class AndroidActivityLauncher : IAndroidActivityLauncher
    {
        public void StartActivity()
        {
            // 在这里编写启动Android活动的代码
            var intent = new Intent(Android.App.Application.Context, typeof(YourActivity));
            intent.AddFlags(ActivityFlags.NewTask);
            Android.App.Application.Context.StartActivity(intent);
        }
    }
}

private void LaunchAndroidActivity()
{
    DependencyService.Get<IAndroidActivityLauncher>().StartActivity();
}