how to call platform specific page from xamarin.fo

问题:

I am new to the xamarin app development, I have some questions :

1. Is it possible to call the platform specific page from the Xamarin.Form page?
2. Can I do Page Navigation from view model?

Let me explain clearly.

I have a Page XFView.xaml , XFView.xaml.cs and XFViewModel.cs in PCL (Xamarin.Forms) project from XFView.xaml.cs or XFViewModel.cs i want to call MAActivity.cs page which is present in Xamarin.Andriod project

I tried a lot but got getting any idea.

回答1:

Whenever you would like to call something from native (MAActivity.cs in your case), you have to use DependencyService.

For example:

1. Setup dependency service

   // PCL Project
   public interface INativePages
   {
       void StartMA();
   }
   
   // MonoDroid Project
   [assembly: Dependency(typeof(NativePages))]
   
   public class NativePages : INativePages
   {
       public void StartMA()
       {
           var intent = new Intent(Forms.Context, typeof(MAActivity));
           Forms.Context.StartActivity(intent);
       }
   }
   

2. Invoke in PCL

   // PCL Project
   DependencyService.Get<INativePages>().StartMA();