Send push notification GCM by java

Question

I have configured a client android Google Cloud Messaging (GCM) to receive push notifications, but I can not configure a server in java to send notifications to devices. How could I?

Solution 1

You can use gcm-server.jar which contains helper methods for GCM messaging. To get this jar you can install "[Deprecated]Google Cloud Messaging for Android Library" through Android SDK Manager. Don't let the deprecated name confuse you. Only the client part is deprecated, not server side.
After install you can find it at "ADT_SDKROOT\sdk\extras\google\gcm". The sample folder contains a demo server which is very easy to understand.
Sending a GCM message involves only few lines of code:

    final String GCM_API_KEY = "yourKey";
    final int retries = 3;
    final String notificationToken = "deviceNotificationToken";
    Sender sender = new Sender(GCM_API_KEY);
    Message msg = new Message.Builder().build();

    try {
                Result result = sender.send(msg, notificationToken, retries);

                if (StringUtils.isEmpty(result.getErrorCodeName())) {
                    logger.debug("GCM Notification is sent successfully");
                    return true;
                }

                logger.error("Error occurred while sending push notification :" + result.getErrorCodeName());
    } catch (InvalidRequestException e) {
                logger.error("Invalid Request", e);
    } catch (IOException e) {
                logger.error("IO Exception", e);
    }
    return false;

Solution 2

For """test""" create java console app, add gcm jar file.

    try{
     Sender sender = new Sender("<senderId>");
     ArrayList<String> devicesList = new ArrayList<String>();
     devicesList.add(<deviceId>);
     String data = "<data>";
     Message message = new Message.Builder()
                        .collapseKey("1")
                        .timeToLive(3)
                        .delayWhileIdle(true)
                        .addData("message",
                                data)
                        .build();
    MulticastResult result = sender.send(message, devicesList, 1);
                sender.send(message, devicesList, 1);

                System.out.println(result.toString());
                if (result.getResults() != null) {
                    int canonicalRegId = result.getCanonicalIds();
                    if (canonicalRegId != 0) {
                    }
                } else {
                    int error = result.getFailure();
                    System.out.println(error);
                }

}

Comments

[user3302527]

It worked. thank you!

[sinujohn]

if it worked, you should consider accepting the answer. It'll be useful to others :)

[Jugal Panchal]

It is what I was looking, thank buddy you have saved my time. :)

[LoveMeSomeFood]

Hi I tried this using Eclipse and got this error. Any idea how to solve this? Exception in thread “main” java.lang.NoClassDefFoundError: org/json/simple/parser/ParseException at NotificationSenderClass.main(NotificationSenderClass.java:16‌​) Caused by: java.lang.ClassNotFoundException: org.json.simple.parser.ParseException at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306)...

[LoveMeSomeFood]

I downloaded the gcm.server.jar file and added it as library. Thanks in advance!

[vivex]

Where i have to pass my projectID ? GCMRegID of receiver device?