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I am trying to build a simple chat messaging app with Android.

I have an Android Studio project with a Cloud Endpoints module. I use this Cloud Endpoints API which is published on my Google App Engine project to communicate with my Cloud SQL database. I can do things like insert rows or delete them. The Cloud SQL database has a table in it called "message" and it is very simple with

message
-------
id
sender
receiver
datetime

Now I want to integrate push notifications using Google Cloud Messaging.

I saw some tutorials such as this one and it explained sort of how it works.

What I do not get is how I can I should set things up with my Cloud Endpoints and my Cloud SQL database so that whenever I write a new row to "message", a push notification is now sent to whatever user it is being sent to.

I know you can use Parse.com for this but how would I do it/set it up using Android Studio + Cloud Endpoints + Google Cloud Messaging, all of which are published on Google App Engine. i.e. how does Snapchat do it (who use Google App Engine)?

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there are a several ways you could implement this, of the top of my head:

  1. you can include a call after you insert messages on your DB to dispatch a message via GCM
  2. You can add a "dispatched" field to messages on your DB and have a GAE cron task to pick up un dispatched tasks and send them on a regular basis, marking them as dispatched when the push message goes out.

It really depends on your app context and requirements.

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  • Thanks for the reply. I think option (1) is the way I want to go. Just wondering if this is the correct way to do it. I really don't want to set up cron tasks, I would like this system to work with the API, but just unsure how people usually do this.
    – Micro
    Jul 15, 2015 at 14:25
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    Both implementations are completely valid, if you are looking for real time notices you should use option 1.
    – jirungaray
    Jul 15, 2015 at 14:41

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