Sending Firebase Push Notifications - Firebase Cloud Messaging

Learn how to implement Firebase Cloud Messaging (FCM) to send push notifications between devices or to multiple devices simultaneously. Explore the process of creating notification data classes, setting up a push notification API, implementing Retrofit for network requests, and configuring Firebase Messaging Service. Discover techniques for creating notification channels, managing notification services, and subscribing to topics. Master the art of obtaining and saving registration tokens, handling token updates, and thoroughly testing your implementation to ensure seamless push notification functionality in your Android application.

Introduction
Coding
Create Notification Data Class
Create Push Notification Data Class
Create Push Notification API
Create Retrofit Instance
Send Notification
Send Button
Firebase Messaging Service
Create Notification
Create Notification Channel
Create Notification Service
Subscribe to Topic
Get Registration Token
Save Token in Share Preferences
Override New Token
Service Token
Testing