I\'m new to all Android GCM push notifications and I have read stack posts but couldn\'t get a straight answer.I have also read Create push notification in android to get a
Just for the information for new visitors on this post, if you want to send same message to multiple devices then simply send comma separated device ids in registration_id parameter of request.
Here is a nice article on this http://www.codewithasp.net/2015/11/send-message-gcm-c-sharp-single-multiple.html