receive the GCM

implements a GCM receiver service

BookAStar/BookAStar.Droid/BookAStar.Droid.csproj

@@ -191,6 +191,7 @@
     <Compile Include="OAuth2\YaOAuth2Authenticator.cs" />
     <Compile Include="Resources\Resource.Designer.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Services\GcmListenerService.cs" />
     <Compile Include="Services\GcmRegistrationIntentService.cs" />
     <Compile Include="Services\MyGcmIntentService.cs" />
     <Compile Include="Services\MyInstanceIdListener.cs" />

BookAStar/BookAStar.Droid/Services/GcmListenerService.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+
+namespace BookAStar.Droid.Services
+{
+    using Android.App;
+    using Android.Content;
+    using Android.OS;
+    using Android.Gms.Gcm;
+    using Android.Util;
+
+    namespace ClientApp
+    {
+        [Service(Exported = false), IntentFilter(new[] { "com.google.android.c2dm.intent.RECEIVE" })]
+        public class MyGcmListenerService : GcmListenerService
+        {
+            public override void OnMessageReceived(string from, Bundle data)
+            {
+                var message = data.GetString("message");
+                Log.Debug("MyGcmListenerService", "From:    " + from);
+                Log.Debug("MyGcmListenerService", "Message: " + message);
+                SendNotification(message);
+            }
+
+            void SendNotification(string message)
+            {
+                var intent = new Intent(this, typeof(MainActivity));
+                intent.AddFlags(ActivityFlags.ClearTop);
+                var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);
+
+                var notificationBuilder = new Notification.Builder(this)
+                    .SetSmallIcon(Resource.Drawable.icon)
+                    .SetContentTitle("GCM Message")
+                    .SetContentText(message)
+                    .SetAutoCancel(true)
+                    .SetContentIntent(pendingIntent);
+
+                var notificationManager = (NotificationManager)GetSystemService(Context.NotificationService);
+                notificationManager.Notify(0, notificationBuilder.Build());
+            }
+        }
+    }
+}