FCM Workflow using GCM
Agenda
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2
Polling Mechanism
What is GCM
Need / advantages of GCM
GCM Architecture
Working of GCM
GCM – Send to Sync [ HTTP ] and Send Data [ XMPP ]
Google Cloud Messaging – APIs
Implementation
Existing FCM uses Polling
Any new updates ?
No
Any new updates ?
No
Any new updates ?
YES
Polling is simple to implement,
But Polling consumes lot of battery , resource.
Extra Network Usages.
3
GCM
4
What is GCM
• GCM stands for Google Cloud Messaging.
• It is a free service that allows you to send data from your
servers to your users and vice versa.
• Handles queuing of messages and delivery to the target
application.
5
Need / advantages of GCM
• Application does not need to be running in the background
for receiving data messages. The system will wake up the
Android application via Intent broadcast when the
message arrives.
• Lower cost and better tracking than SMS
• Scalability & extensibility
• GCM is completely free no matter how big your messaging
requirements
6
GCM Architecture
7
Working of GCM
1.Request for Registration
2.Reply with Registration Id
GCM
5. Send Message
Mobile App
3.Send Registration Id
8
4. Send message {RegId, msg }
GCM – Send to Sync [HTTP]
2. Send Notification message
GCM
Mobile App
3. Download data
9
1. Send Notification message
GCM – Send Data [ XMPP ]
Send message
GCM
Persistent XMPP connection
Mobile App
Send message
10
Google Cloud Messaging – APIs
Time To Live and Delay While Idle
Multiple Senders
Message Multicasting
11
Implementation
GCM Server
• Creating a
Google API
project
• Enabling the
GCM Service
12
Implementation
Mobile App
Copy the
required
libs
Add a
broadcast
receiver
Make
changes
to the
manifest
13
Wire it up
in your
activity
Add an
Intent
service
Implementation
Application Server
• Expose Service to receive and store user information and GCM
registration Id.
• Send message to GCM service.
14
Minimum requirements ( device side )
• Android 2.2 +
• Google Play Store application should be installed
• Internet connection
• Google account ( device version < 4.0.4 )
• For Developer Emulator with Google APIs
15
References
• https://developer.android.com/google/gcm/index.html
• Presentation by Francesco Nerieri
https://developers.google.com/events/io/sessions/324893448
16
Thank you
Any questions?