[Android] Firebase FCM을 사용하여 서버 없이 push 알림 구현하기 code4.java

public class FCMService extends FirebaseMessagingService {

    public FCMService() {
    }

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        if (remoteMessage.getData().size() > 0) {
            sendNotification(remoteMessage.getData());
        }
    }

    private void sendNotification(Map<String, String> messageMap) {
        String recruitId = messageMap.get("recruitId");
        String body = messageMap.get("body");

        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_user_add)
                        .setContentTitle("FCM Message")
                        .setContentText(body)
                        .setAutoCancel(true)
                        .setSound(defaultSoundUri)

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0, notificationBuilder.build());
    }
}