How to send GCM messages

Question

I want to send same message to multiple devices in android using GCM. Currently I am able to send push notification on single device in java. But I want to send it to multiple devices.

so how can I do this?

my single device code is:

try{
Sender sender = new Sender(GOOGLE_SERVER_KEY);
Message message = new Message.Builder().timeToLive(30)
        .delayWhileIdle(true).addData(GOOGLE_MESSAGE_KEY,
                    userMessage).build();
            result = sender.send(message, token, 1);
    } catch (Exception e) {
        System.out.println(e);
    } 

Any help or idea are highly appreciated.

Thanks

Answer 1

multiple device code is:

List<String> tokens=new ArrayList<String>();
Sender sender = new Sender(GOOGLE_SERVER_KEY);
Message message = new Message.Builder().timeToLive(30)
.delayWhileIdle(true).addData(GOOGLE_MESSAGE_KEY,
     userMessage).build();
    sender.send(message, tokens, 1);