[GCM] Google Cloud Messaging

Implementing Android GCM in a different package other than the main application package

http://dimitar.me/implementing-android-gcm-in-a-different-package-other-than-the-main-application-package/
Android Push Notifications using Google Cloud Messaging GCM - Android Example:  http://androidexample.com/Android_Push_Notifications_using_Google_Cloud_Messaging_GCM/index.php?view=article_discription&aid=119&aaid=139

Android Push Notifications using Google Cloud Messaging (GCM), PHP and MySQL (ipcam use this sample)
http://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/

Android Google Cloud Messaging (GCM) 入門筆記
http://hsuchihche.pixnet.net/blog/post/316287368-android-google-cloud-messaging-(gcm)-%E5%85%A5%E9%96%80%E7%AD%86%E8%A8%98

https://fundroiding.wordpress.com/2012/06/29/google-cloud-messaging-for-android-gcm-simple-tutorial/
http://www.androidhub4you.com/2013/04/google-cloud-messaging-example-in.html
http://magiclen.org/android-push-notification/