How to Implement FCM in Xamarin Forms

So many people have asked for convenient and efficient way of implementing FCM (Firebase Cloud Messaging) for android in Xamarin Form. Actually FCM lib cannot be installed in xamarin forms due to version conflict of android support lib present in xamarin forms. So here is the work around

Firebase Cloud Messaging (FCM) is a cross-platform service that handles the sending, routing, and queueing of messages between server applications and mobile client apps. FCM is the successor to Google Cloud Messaging (GCM), and it is built on Google Play Services.

Refer to following sample project in which the FCM is implemented in xamarin forms

https://github.com/HabibAli/FCM-Xamarin-Forms

If you want a similar implementation in your project then copy the GCM.Client folder in your project

In MainActivity.cs class declare

using Gcm.Client; at the top

and in class body

static MainActivity instance = null;

// Return the current activity instance.
    public static MainActivity CurrentActivity
    {
      get
      {
        return instance;
      }
    }

In OnCreate method

base.OnCreate(bundle);

try
{
  // Check to ensure everything's set up right
  GcmClient.CheckDevice(this);
  GcmClient.CheckManifest(this);

  // Register for push notifications
  System.Diagnostics.Debug.WriteLine("Registering...");
  GcmClient.Register(this, PushHandlerBroadcastReceiver.SENDER_IDS);
}
catch (Java.Net.MalformedURLException)
{
  CreateAndShowDialog("There was an error creating the client. Verify the URL.", "Error");
}
catch (Exception e)
{
  CreateAndShowDialog(e.Message, "Error");
}

Declare the function

    private void CreateAndShowDialog(String message, String title)
    {
      AlertDialog.Builder builder = new AlertDialog.Builder(this);

      builder.SetMessage(message);
      builder.SetTitle(title);
      builder.Create().Show();
    }

Your app needs to import Gcm.Client folder into the project
In that folder following classes are present

Constants.cs //Constants for GCM. In that file you also need to provide SENDER_ID as derived from your firebase console application
https://console.firebase.google.com/
GcmBroadcastReceiverBase.cs //Receiver for push notification
GcmService.cs //A service for registering and receiving notification
GcmServiceBase.cs //Base class
InternalGcmClient.cs //Utility class for GCM Client

Following nuggets needs to be present in your application

Xamarin.Android.Support.v7.AppCompat 23.3.0
Xamarin.GooglePlayServices.Gcm 29.0.0.2

After doing all those tasks above, your project is ready to process push notification fired by firebase console

Regards

Habib Ali
Mohammad Samiullah Farooqi