How to setup FCM in Xamarin forms - xamarin

I am new to Xamarin.
How to setup FCM in Xamarin forms for both environments (Android and iOS)?
Thanks in advance

Find this GitHub source code for understanding cross-platform implementation of FCM in xamarin forms.
https://github.com/yamachu/TryFirebaseXamarin
Separately follow this source to understand the setup of FCM for:
android
https://www.codeproject.com/Articles/1121218/Android-Firebase-Cloud-Messaging-Tutorial
iOS
https://xamarinlatino.com/xamarin-forms-firebase-cloud-messaging-ios-setup-1961a91d4055

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Can I extend xamarin WatchOS to android as well?

I have to create a small iWatch app. i am confused if I should go ahead with Xamarin WatchOS or swift. Can xamarin WatchOS be extended to android wear? what to go with?
No. WatchOS is an Apple SDK. Android uses the Wear SDK. They are two completely different things. You may be able to share some backend code between the two platforms using Xamarin.
https://github.com/jamesmontemagno/Hanselman.Forms
this is an excellent way of extending xamarin into WatchOS.

GCM to FCM for Xamarin

Xamarin has the predefined support to GCM (Google Cloud Messaging) which was explained in https://developer.xamarin.com/guides/cross-platform/application_fundamentals/notifications/android/remote_notifications_in_android/
As currently Google migrated from GCM to FCM (Firebase Cloud Messaging) does it work with Xamarin with same instruction or there any other Docs for integrating FCM with Xamarin?
Does all features provided in Firebase can be used in Xamarin App?
does it work with Xamarin with same instruction?
No, it doesn't. But you can still work with GCM since Google hasn't announced that GCM support will stop just now. They just posted that FCM is the newest version of GCM.
there any other Docs for integrating FCM with Xamarin?
Not just yet, Xamarin doesn't have a guide about how to integrate FCM with your Xamarin.Android app.
Does all features provided in Firebase can be used in Xamarin App?
Yes, they can be used with Xamarin. But at this moment we have to wait until Xamarin provides us with official bindings(dlls) for FCM java libraries(jars) and probably they will post something in their blog about how to integrate this with our apps.
At this point, the best thing you can do while developing with Xamarin is use GCM. The other thing you can do, is create your own bindings with FCM java libraries and use Google's tutorial for android (in java)
While the last option will probably work, when the official Xamarin bindings come you will have to change a lot of code in order to make it work with upcoming updates from Google and Xamarin.
EDIT: as pointed out by #SørenBoisen Xamarin has started to rollout official(pre-release) bindings via nugget: https://www.nuget.org/packages/Xamarin.Firebase.Common/
More info at: Support for Google Firebase — Xamarin Forums
The Firebase bindings are now available for Xamarin Android as a nuget package here:

How can we Integrate Xamarin.Forms Application/Component with Xamarin native Application?

I have developed an app/component using Xamarin.Forms and as per the requirement I need to integrate that component with another app which is developed on Xamarin Native in Android as well as iOS.
Kindly help me with the suggestions or references
I've seen something like that on a sample called Native2Forms.
What it does, at least in Android, is to use a separete activity to integrate the Xamarin Forms PCL (FormsActivity).

Basic cross platform app using Xamarin

i'm newbie in Xamarin. am download all components and i don't know how to develop cross platform app for iOS, android and windows.
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Here it is the official guides, they are pretty much helpful for basic development, you will have to use Xamarin.iOS and Xamarin.Android to develop some specific thing more related to the platform.

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