Firebase Cloud Messaging for Android Development

1. What is Firebase Cloud Messaging (FCM)?

  • FCM (Firebase Cloud Message) is a new version of GCM (Google Cloud Message).
  • With the help of FCM, easily deliver messages at no cost.
  • It is supported by Android, iOs, and Web platforms.
  • Firebase messaging is a lightweight, serverless messaging solution built on Firebase Cloud Messaging.
  • Send push notifications to all your users anywhere in the whole world using firebase messaging.

2. Android listener service:

  • InstanceIDListenerService is required only to access the FCM token.
  • Manage the device token to send messages to a single device directly.
  • send messages to a device group, subscribe devices to the topic with the server.

3. Additional features of FCM:

  • Topic messaging:
    • Using Topic Messaging users get a notification in common topics.
    • FCM delivers your message to all the devices subscribed to this topic.
    • There is no limit on topic messaging.
    • The single topic has as many subscribers, or users can subscribe across different topics.
  • Firebase Remote Config:
    • You change the appearance and behavior of your app without requiring users to download an app update using Firebase Remote Config, and it is a cloud service.
  • Analytics:
    • Firebase Analytics works with other Firebase features.
    • Thus, the user can take action on everything from click-through rates to app crashes.
  • Easy Implementation:
    • Firebase is quick and easy.
    • APIs packaged into a single SDK, you can solve customer’s problems without wasting time building complex infrastructure using intuitively.
  • Cross-platform support:
    • APIs packaged into single SDKs for iOS, Android, JavaScriptand C++ using Cross-platform support.
    • Expand to different platforms without modifying your infrastructure.

4. Firebase Cloud Messaging / FCM Sender ID:

  • The equivalent of Google Cloud Messaging (GCM) Sender ID. The path of this id is Firebase > Project > Settings > Cloud Messaging tab.

5. What are the benefits of upgrading to Firebase Cloud Messaging SDK?

  • Simpler client development. Users can’t write your own registration or subscription retry logic.
  • An out-of-the-box notification solution.
  • Anyone sends notifications to target specific audiences based on Firebase Analytics insights using Firebase Notifications, and it is a serverless notifications solution with a web console.

6. What’s new with Firebase Cloud Messaging Service (FCM)?

  • New FCM libraries:
    • FCM libraries use manifest merging, so you don’t have to worry about permissions.
    •  It automatically adds any permission, needed to reduce the amount of effort you put in.
  • Simplified registration flow:
    • Using “Registration Token” as an address, FCM delivers the message to the device.
    •  This process is now asynchronous.
    •  On your behalf google library takes token automatically.
    •  So, when you request to ‘get token’, you get a registered token.
    • Send registered token to your servers, and start sending messages.
    •  All these new improvements apply to both Android and iOS SDKs.

7. Key capability:

  • Notification or data messages
  • Versatile targeting
  • Upstream messages

8. Token problem:

  • Where to store the token
  • More than one token per user
  • What happens when the user logs out
  • Keep sending email

9. Notification Payload:


“title”: “Test Notification”,

“body”: “Hello!!! Notification”


  • “icon”: Android & iOS
  • “sound”: only Android
  • “badge”: only iOS
  • “click_action”: Android & iOS

10. Data payload:


“title”: “Test Notification”,

“body”: “Hello!! Notification”,

“user_id”: “GVDHDHJ12653,

“user_avatar”: “user  image”,

“notification_type”: “private_message”


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