FCM(Firebase Cloud Messaging) 설정하기

* Gradle - Project

buildscript {
    repositories {
        google()   
    }
    dependencies {
        classpath 'com.google.gms:google-services:4.2.0'
    }
}

allprojects {
    repositories {
        google()       
    }
}

* Gradle - Module

dependencies {
    implementation 'com.google.firebase:firebase-core:17.0.1'
    implementation 'com.google.firebase:firebase-messaging:20.0.0'
}

apply plugin: 'com.google.gms.google-services'

* AndroidManifest.xml

<application
    <service android:name=".service.FirebaseMessaging">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>
</application>

* FirebaseMessaging.java

public class FirebaseMessaging extends FirebaseMessagingService {

    @Override
    public void onNewToken(String token) {
        Log.d("@@", "Refreshed token: " + token);
    }

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getNotification() != null) {
            Log.d("@@", "알림 메시지: " + remoteMessage.getNotification().getBody());
            String messageBody = remoteMessage.getNotification().getBody();
            String messageTitle = remoteMessage.getNotification().getTitle();
            Intent intent = new Intent(this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
            String channelId = "Channel ID";
            Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            NotificationCompat.Builder notificationBuilder =
                    new NotificationCompat.Builder(this, channelId)
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setContentTitle(messageTitle)
                            .setContentText(messageBody)
                            .setAutoCancel(true)
                            .setSound(defaultSoundUri)
                            .setContentIntent(pendingIntent);
            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                String channelName = "Channel Name";
                NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_HIGH);
                notificationManager.createNotificationChannel(channel);
            }
            notificationManager.notify(0, notificationBuilder.build());
        }
    }

}

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FragmentManager fragmentManager = getFragmentManager();
        MapFragment mapFragment = (MapFragment) fragmentManager.findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        FirebaseInstanceId.getInstance().getInstanceId()
                .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                    @Override
                    public void onComplete(@NonNull Task<InstanceIdResult> task) {
                        if (!task.isSuccessful()) {
                            Log.w("@@", "getInstanceId failed", task.getException());
                            return;
                        }

                        // String token = task.getResult().getToken();
                        // Log.d("FCM Log", "FCM 토큰: " + token);
                        // Toast.makeText(MainActivity.this, token, Toast.LENGTH_SHORT).show();
                    }
                });

    }
    
}

* 메시지 보내기

1. Firebase Console(https://console.firebase.google.com)

로그인 - Google 계정

2. 프로젝트 선택

3. 좌측 메뉴에서 Cloud Messaging

4. 우측의 Send your first message

5. 타이틀, 제목 입력 후 전송