FCM Android Basics

Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost.

Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention. For use cases such as instant messaging, a message can transfer a payload of up to 4KB to a client app.

This project is about how to add FCM in android and how to send notification from one device to another or a group of topic subscriber.

Official documentation

• Overview
• Introduction
• Android

Tutorial followed

• Java and volly
• Kotlin and retrofit