Is a GCM registration token with a colon valid?

Question

i am using the below code to get the DCM Registration token

 String token = \"NoREG\";
    try {
        InstanceID instanceID = InstanceID.getInstance(getA         


        

Answer 1

The GCM registration token is usually around 140 chars in length, and can contain colons, underscores and hyphens. Maximum size is supposed to be 4k.