This blog is about how to implement FCM(Firebase Cloud messaging) from Android Studio.

Android studio gives you tools to implement  Firebase tools in very easy way.

1. Open Android Studio. (Make sure Android Studio is up to date)

2. Click on Tools from menu.

3. Select Firebase. This will open side window of Firebase tools.

4. Select Cloud Messaging and click on setuo Firebase cloud messaging.

5. Now click to Connect to Firebase. this will open login page in browser.

6. Give allow to permissions.

7. If you have already created project in Firebase then select that one or Create new project.

8. Connect to Firebase.

9. Click on Add FCM to app.

10. Create class which extends FirebaseInstanceIdService.

11. Override onTokenRefresh() method in class. You will get device token from this method.

@Override
public void onTokenRefresh() {
    // Get updated InstanceID token.
    String token = FirebaseInstanceId.getInstance().getToken();
  
}

12. Add this service class also in manifest.

<service
    android:name="SERVICE_NAME_HERE">
    <intent-filter>
        <action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
    </intent-filter>
</service>

13. Create new service class which extends FirebaseMessagingService.

14. Override onMessageReceived() of class.

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
 
    Log.d(TAG, "Notification Message" + remoteMessage.getNotification().getBody());
}

15. Register Service to Manifest also.

<service
    android:name="SERVICE_CLASS_NAME">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT"/>
    </intent-filter>
</service>

16. Now you can test your notification from https://console.firebase.google.com.

Happy Coding :D