//앱 실행되면서 자동으로 Firebase 토픽을 구독하게 설정, 버튼을 만들어 구독하게 할 수 있다. FirebaseMessaging.getInstance().subscribeToTopic("news");//구독 //구독 취소는 unsubscribeFromTopic()을 호출한다.

public class MyFirebaseMessagingService extends FirebaseMessagingService { private static final String TAG = "MyFirebase"; @Override public void onMessageReceived(RemoteMessage remoteMessage) { //data payload로 보내면 실행 // ... // TODO(developer): Handle FCM messages here. // Not getting messages here? See why this may be: https://goo.gl/39bRNJ Log.d(TAG, "From: " + remoteMessage.getFrom()); //여기서 메세지의 두가지 타입(1. data payload 2. notification payload)에 따라 다른 처리를 한다. // Check if message contains a data payload. if (remoteMessage.getData().size() > 0) { Log.d(TAG, "Message data payload: " + remoteMessage.getData()); //화면을 깨운다. 그러나 이방법은 Deprecated 되었다. 더이상 사용되지 않는다는 것이다. 현재로 작동은 하지만 나중에 어떻게 될지 모른다. PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE); PowerManager.WakeLock wakeLock = powerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "TAG"); wakeLock.acquire(3000); String title = remoteMessage.getData().get("title"); String body = remoteMessage.getData().get("content"); String click_action = remoteMessage.getData().get("clickAction"); sendNotification(title, body, click_action); } // Check if message contains a notification payload. if (remoteMessage.getNotification() != null) { Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody()); // String title = remoteMessage.getNotification().getTitle(); // String body = remoteMessage.getNotification().getBody(); // String click_action = remoteMessage.getNotification().getClickAction(); // sendNotification(title, body, click_action); } // Also if you intend on generating your own notifications as a result of a received FCM // message, here is where that should be initiated. See sendNotification method below. } private void sendNotification(String title, String messageBody, String click_action) { if (title == null){ //제목이 없는 payload이면 title = "FCM Noti"; //기본제목을 적어 주자. } //전달된 액티비티에 따라 분기하여 해당 액티비티를 오픈하도록 한다. Intent intent; if (click_action.equals("MainActivity")) { intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); }else if(click_action.equals("NotiAcivity")){//이런 액티비티 이름을 잘못 타이핑했네.ㅋ intent = new Intent(this, NotiAcivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); } else if (click_action.equals("NewsActivity")){ intent = new Intent(this, NewsActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); } else { intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); } PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT); Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle(title) .setContentText(messageBody) .setAutoCancel(true) .setSound(defaultSoundUri) .setVibrate(new long[]{1000, 1000}) .setLights(Color.BLUE, 1,1) .setContentIntent(pendingIntent); NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); notificationManager.notify(0 /* ID of notification */, notificationBuilder.build()); } }