Code example for GoogleCloudMessaging

Methods: register

	            String msg = "";
	            try { 
	                if (gcm == null) {
	                    gcm = GoogleCloudMessaging.getInstance(context);
	                regid = gcm.register(SENDER_ID);
	                msg = "Device registered, registration id=" + regid;
	                // You should send the registration ID to your server over HTTP, 
	                // so it can use GCM/HTTP or CCS to send messages to your app. 
	                // For this demo: we don't need to send it because the device 
	                // will send upstream messages to a server that echo back the message 
	                // using the 'from' address in the message. 
	                // Save the regid - no need to register again. 
	                setRegistrationId(context, regid);
	            } catch (IOException ex) {
	                msg = "Error :" + ex.getMessage();
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