Push Notification In Xamarin.Android Using Google Cloud Messaging (GCM)

Right-click on google-services.json file and click Properties.



Select Build Action to be GoogleServiceJson.



Open AndroidManifest.xml under Android project's Properties.
Right-click Android project and click Properties. Go to Android Manifest tag and check "INTERNET" checkbox under the required permissions.



Add a new C# code file. Name it according to your project. Here, it's name is DemoFirebaseIdServices.cs. Include the code given below.



Build the solution and run the project in debug mode on an Android device. Make sure that the device is connected to the internet and Google Play Services are installed on the device.



Once the project is running, watch the Output Window in Visual Studio, where refresh token will appear. Copy the token.

Open your Firebase project in the Browser, which you created in Step 5. Click Notification menu in Navigation bar on the right and click Send your first message.



On the Compose message page, add message text, add message label, select Single device under Target section and add registration token copied in Step 22 and click Send message.



The notification will then be sent to Single device and the next page shows the status of sent notification message.



Completed status of the notification message shows that the notification has successfully reached the target device.



The project is available on GitHub at th URL https://github.com/imranaftab/xamarin-android-push-notification-with-google-cloud-messaging-gcm