Softminer.net

First download the sample here:
https://developer.xamarin.com/samples/monodroid/Firebase/FCMNotifications/

Then you have to create a project in Firebase
http://firebase.google.com

download google-services.json
right click on the google-service.json and set the Build Action vlaue to GoogleServicesJson



when your app is running the device get the token.

To send notification to device you need serverkey which you get from firebase server and token which you get from device in running mode

To send by postmann



you can write small c# code to post to sever by webclient:

using (var client = new WebClient())
     {
        var values = "{\"to\" : \"toekn",\"notification\" : {\"body\" : \"test\",\"title\" : \"title\",\"icon\" : \"myicon\"}}";
         client.Headers.Set("Content-Type", "application/json");
          client.Headers.Set("Authorization", "key=serverkey");
         var response = client.UploadString("https://fcm.googleapis.com/fcm/send", values);
         }

Using Microsoft Azure

using System;
using Microsoft.Azure.NotificationHubs;

namespace SendToNotificationHub
{
    class Program
    {
        public static string connectionString = "Endpoint=sb://app.servicebus.windows.net/;SharedAccessKeyName=DefaultFullSharedAccessSignature;SharedAccessKey=yourkey";
        public static string NotificationHubPath = "your-hub";

        static void Main(string[] args)
        {
            SendNotificationAsync();
            Console.ReadLine();
        }


        private static async void SendNotificationAsync()
        {
            NotificationHubClient hub = NotificationHubClient.CreateClientFromConnectionString
            (connectionString, NotificationHubPath);
            var alert = "{\"aps\":{\"alert\":\"Hi!\"}}";
            await hub.SendAppleNativeNotificationAsync(alert);
        }
    }
}

To publish Xamarin Project on Google play:

https://developer.xamarin.com/guides/android/deployment,_testing,_and_metrics/publishing_an_application/

You dont need to do all above steps mentioned in xamarin website. (e.g create a google play account and upload it via browser)

Choose release instead of Release ( Goole play doesnt allow Debugging)

RightClick on Publish and then click on Archive.

After Archiving click on Distribute there you have to define a signing identity (Adhoc) then you can click on Save As and export the project.


Then you have to zipalign the apk file: