Send push notification GCM by java

android, google-cloud-messaging, java, push-notification

Solution

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;

Problem

Original source