Question

I have set in my application the google cloud messaging service and everything works but if i send a message to my application the messages are received only by the users that i know the deviceId. How i can send my message to all the devices that use my app ?

Thank You very much

Answer 1

You cannot send message to the devices that are not registered.

Firstly, those devices should register using the GCMRegistrar.register and send the registrationId to the server, then you can be able to send messages to those devices.

    final String regId = GCMRegistrar.getRegistrationId(context);

    if (!regId.equals("")) {
        // Device is alredy registered. This checks whether it is registered
        // on the server or not.
        if (!GCMRegistrar.isRegisteredOnServer(context)) {
            // Save regId to server
            registerInBackground(context, regId);
        } else {
            Log.v(TAG, "Already registered");
        }
    } else {
        GCMRegistrar.register(context, senderId);
    }