Implementing Push Notifications in Your Android Apps
An important feature of almost every app is the ability to support push notifications. With push notifications, you can update your users without requiring the app to run at all times or having it poll a server, potentially running down the battery. With the introduction of Firebase Cloud Messaging (FCM), Google made it a little bit easier to implement push notifications in Android apps. FCM is the new and improved version of Google Cloud Messaging (GCM) that you can use to send remote notifications to your client app.
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