switch from GCM to FCM

src/Android/FirebaseMessagingService.cs

@@ -0,0 +1,42 @@
+using System;
+using Android.App;
+using Android.Content;
+using Bit.App.Abstractions;
+using Firebase.Messaging;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Xamarin.Forms;
+using XLabs.Ioc;
+
+namespace Bit.Android
+{
+    [Service]
+    [IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
+    public class FirebaseMessagingService : Firebase.Messaging.FirebaseMessagingService
+    {
+        public override void OnMessageReceived(RemoteMessage message)
+        {
+            if(message?.Data == null)
+            {
+                return;
+            }
+
+            var data = message.Data.ContainsKey("data") ? message.Data["data"] : null;
+            if(data == null)
+            {
+                return;
+            }
+
+            try
+            {
+                var obj = JObject.Parse(data);
+                var listener = Resolver.Resolve<IPushNotificationListener>();
+                listener.OnMessage(obj, Device.Android);
+            }
+            catch(JsonReaderException ex)
+            {
+                System.Diagnostics.Debug.WriteLine(ex.ToString());
+            }
+        }
+    }
+}