Android FCM message | one device to another device

 메세지를 하나의 디바이스에서 다른 디바이스로 보내는 방법입니다.

 

 

 

 

 일단은 서버키를 넣어주고

 

 

	class Constants {
	companion object {
	const val BASE_URL = "https://fcm.googleapis.com"
	const val SERVER_KEY = "토큰키"
	const val CONTENT_TYPE = "application/json"
	}
	}

view raw Constants.kt hosted with ❤ by GitHub

	private const val CHANNEL_ID = "my_channel"
	class FirebaseService : FirebaseMessagingService() {
	companion object {
	var sharedPref: SharedPreferences? = null
	var token: String?
	get() {
	return sharedPref?.getString("token", "")
	}
	set(value) {
	sharedPref?.edit()?.putString("token", value)?.apply()
	}
	}
	override fun onNewToken(newToken: String) {
	super.onNewToken(newToken)
	token = newToken
	}
	override fun onMessageReceived(message: RemoteMessage) {
	super.onMessageReceived(message)
	val intent = Intent(this, MainActivity::class.java)
	val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
	val notificationID = Random.nextInt()
	if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
	createNotificationChannel(notificationManager)
	}
	intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
	val pendingIntent = PendingIntent.getActivity(this, 0, intent, FLAG_ONE_SHOT)
	val notification = NotificationCompat.Builder(this, CHANNEL_ID)
	.setContentTitle(message.data["title"])
	.setContentText(message.data["message"])
	.setSmallIcon(R.drawable.ic_launcher_background)
	.setAutoCancel(true)
	.setContentIntent(pendingIntent)
	.build()
	notificationManager.notify(notificationID, notification)
	}
	@RequiresApi(Build.VERSION_CODES.O)
	private fun createNotificationChannel(notificationManager: NotificationManager) {
	val channelName = "channelName"
	val channel = NotificationChannel(CHANNEL_ID, channelName, IMPORTANCE_HIGH).apply {
	description = "My channel description"
	enableLights(true)
	lightColor = Color.GREEN
	}
	notificationManager.createNotificationChannel(channel)
	}
	}

view raw FirebaseService.kt hosted with ❤ by GitHub

	const val TOPIC = "/topics/myTopic2"
	class MainActivity : AppCompatActivity() {
	val TAG = "MainActivity"
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_main)
	FirebaseService.sharedPref = getSharedPreferences("sharedPref", Context.MODE_PRIVATE)
	FirebaseInstanceId.getInstance().instanceId.addOnSuccessListener {
	FirebaseService.token = it.token
	etToken.setText(it.token)
	Log.e("MainActivity", it.token)
	}
	FirebaseMessaging.getInstance().subscribeToTopic(TOPIC)
	btnSend.setOnClickListener {
	val title = etTitle.text.toString()
	val message = etMessage.text.toString()
	val recipientToken = etToken.text.toString()
	if(title.isNotEmpty() && message.isNotEmpty() && recipientToken.isNotEmpty()) {
	PushNotification(
	NotificationData(title, message),
	recipientToken
	).also {
	sendNotification(it)
	}
	}
	}
	}
	private fun sendNotification(notification: PushNotification) = CoroutineScope(Dispatchers.IO).launch {
	try {
	val response = RetrofitInstance.api.postNotification(notification)
	if(response.isSuccessful) {
	Log.d(TAG, "Response: ${Gson().toJson(response)}")
	} else {
	Log.e(TAG, response.errorBody().toString())
	}
	} catch(e: Exception) {
	Log.e(TAG, e.toString())
	}
	}
	}

view raw MainActivity.kt hosted with ❤ by GitHub

	interface NotificationAPI {
	@Headers("Authorization: key=$SERVER_KEY", "Content-Type:$CONTENT_TYPE")
	@POST("fcm/send")
	suspend fun postNotification(
	@Body notification: PushNotification
	): Response<ResponseBody>
	}

view raw NotificationAPI.kt hosted with ❤ by GitHub

	data class NotificationData(
	val title: String,
	val message: String
	)

view raw NotificationData.kt hosted with ❤ by GitHub

	data class PushNotification(
	val data: NotificationData,
	val to: String
	)

view raw PushNotification.kt hosted with ❤ by GitHub

	class RetrofitInstance {
	companion object {
	private val retrofit by lazy {
	Retrofit.Builder()
	.baseUrl(BASE_URL)
	.addConverterFactory(GsonConverterFactory.create())
	.build()
	}
	val api by lazy {
	retrofit.create(NotificationAPI::class.java)
	}
	}
	}

view raw RetrofitInstance.kt hosted with ❤ by GitHub

 

 그리고 manifest에서 권한 추가