Firebase FCM

Firebase SDK 추가

implementation 'com.google.firebase:firebase-messaging-ktx'

현재 등록 토큰 검색

FirebaseMessaging.getInstance().token

앱 매니페스트 수정

FirebaseMessagingService 를 사용하려면 앱 매니페스트에 다음을 추가해야 한다.

<service
    android:name=".java.MyFirebaseMessagingService"
    android:exported="false">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT" />
    </intent-filter>
</service>

NotificationService

FirebaseMessagingService 클래스를 확장하는 service를 추가해준다.

class NotificationService : FirebaseMessagingService() {

    private val TAG = "FirebaseService"

    override fun onNewToken(token: String) {
        Log.d(TAG, "new Token: $token")
    }

    override fun onMessageReceived(remoteMessage: RemoteMessage) {
        if(remoteMessage.data.isNotEmpty()){
            sendNotification(remoteMessage)
        }else {
            Log.e(TAG, "data가 비어있습니다. 메시지를 수신하지 못했습니다.")
        }
    }

    private fun sendNotification(remoteMessage: RemoteMessage) {
        val uniId: Int = (System.currentTimeMillis() / 7).toInt()

        val intent = Intent(this, PromiseSettingActivity::class.java)
        for(key in remoteMessage.data.keys){
            intent.putExtra(key, remoteMessage.data.getValue(key))
        }
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) // Activity Stack 을 경로만 남김(A-B-C-D-B => A-B)
        val pendingIntent = PendingIntent.getActivity(this, uniId, intent, PendingIntent.FLAG_MUTABLE)

        // 알림 채널 이름
        val channelId = "my_channel"

        // 알림에 대한 UI 정보, 작업
        val notificationBuilder = NotificationCompat.Builder(this, channelId)
            .setSmallIcon(R.mipmap.ic_launcher) // 아이콘 설정
            .setContentTitle(remoteMessage.data["title"].toString()) // 제목
            .setContentText(remoteMessage.data["body"].toString()) // 메시지 내용
            .setAutoCancel(true) // 알람클릭시 삭제여부
            .setContentIntent(pendingIntent) // 알림 실행 시 Intent

        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        // 오레오 버전 이후에는 채널이 필요
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel(channelId, "Notice", NotificationManager.IMPORTANCE_DEFAULT)
            notificationManager.createNotificationChannel(channel)
        }

        // 알림 생성
        notificationManager.notify(uniId, notificationBuilder.build())
    }

}

Retrofit을 이용해 알림 보내기

interface CloudMessagingService {

    @Headers(
        "Content-Type: application/json",
        "Authorization: key=AAAAp3dHyfU:APA91bEOp3rEcmyHyhCvOtdZd3p-Rl6EJqqiNJCLKmscovQThchZwjJ6ksEt_nVHvKjOgQpcSv10dZvmQr1x_-VTKADav2Fub5l6KcqQDUc7lMsX9Q42y_KRuIm2pcL0xA7Ike0C4dBr"
    ) // 서버키
    @POST("fcm/send")
    suspend fun sendNotification(@Body notification: NotificationRequestBody)

}

data class NotificationRequestBody(
    val to: String,
    val data: NotificationRequestData
)

data class NotificationRequestData(
    val title: String,
    val body: String
)

https://firebase.google.com/docs/cloud-messaging/http-server-ref#downstream-http-messages-plain-text
https://firebase.google.com/docs/cloud-messaging/android/receive?authuser=0&hl=ko
https://stickode.tistory.com/335
https://minchanyoun.tistory.com/101
https://popcorn16.tistory.com/71
https://bacassf.tistory.com/166
https://github.com/HanYeop/Happy-Sharing/blob/master/app/src/main/java/com/hanyeop/happysharing/model/NotificationBody.kt
https://github.com/younminchan/kotlin-study/blob/main/FCMkotlin/app/src/main/java/com/example/fcm_kotlin/MyFirebaseMessagingService.kt
https://minchanyoun.tistory.com/99?category=1013568
https://anhana.tistory.com/7
https://www.google.com/search?q=%EC%BD%94%ED%8B%80%EB%A6%B0+fcm&rlz=1C5CHFA_enKR912KR912&oq=%EC%BD%94%ED%8B%80%EB%A6%B0+fcm&aqs=chrome..69i57.7731j0j7&sourceid=chrome&ie=UTF-8