Download the google-services.json file and add it to the app folder of the Android app.<\/li>\n<\/ol>\n2.2 Gradle Setup<\/h3>\n
Add the necessary dependencies to the app’s build.gradle file:<\/p>\n
dependencies {\n implementation 'com.google.firebase:firebase-messaging-ktx:23.1.0' \/\/ Check for the latest version\n }<\/code><\/pre>\nAnd add the following to the project’s build.gradle file to apply the Google services plugin:<\/p>\n
buildscript {\n dependencies {\n classpath 'com.google.gms:google-services:4.3.10'\n }\n }<\/code><\/pre>\n2.3 Manifest Setup<\/h3>\n
Set up the FCM service in the AndroidManifest.xml file:<\/p>\n
<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n package=\"com.example.myapp\">\n\n <application\n ... >\n\n <service\n android:name=\".MyFirebaseMessagingService\">\n <intent-filter>\n <action android:name=\"com.google.firebase.MESSAGING_EVENT\"\/>\n <\/intent-filter>\n <\/service>\n\n <\/application>\n <\/manifest><\/code><\/pre>\n3. Implementing FCM Messaging Service<\/h2>\n
Now let’s implement the MyFirebaseMessagingService class to receive messages via FCM.<\/p>\n
3.1 MyFirebaseMessagingService Class<\/h3>\n
To receive push notifications, create the MyFirebaseMessagingService class that inherits from FirebaseMessagingService:<\/p>\n
import android.app.NotificationChannel\n import android.app.NotificationManager\n import android.content.Context\n import android.os.Build\n import android.util.Log\n import com.google.firebase.messaging.FirebaseMessagingService\n import com.google.firebase.messaging.RemoteMessage\n\n class MyFirebaseMessagingService : FirebaseMessagingService() {\n override fun onMessageReceived(remoteMessage: RemoteMessage) {\n \/\/ Message receive logic\n Log.d(\"FCM\", \"From: ${remoteMessage.from}\")\n\n remoteMessage.notification?.let {\n sendNotification(it.title, it.body)\n }\n }\n\n private fun sendNotification(title: String?, messageBody: String?) {\n val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager\n val channelId = \"default_channel\"\n val builder = NotificationCompat.Builder(this, channelId)\n .setSmallIcon(R.drawable.ic_notification)\n .setContentTitle(title)\n .setContentText(messageBody)\n .setPriority(NotificationCompat.PRIORITY_DEFAULT)\n\n if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {\n val channel = NotificationChannel(channelId, \"Channel human-readable title\", NotificationManager.IMPORTANCE_DEFAULT)\n notificationManager.createNotificationChannel(channel)\n }\n\n notificationManager.notify(0, builder.build())\n }\n }<\/code><\/pre>\n4. Sending Messages from the Server<\/h2>\n
Now let’s look at how to send messages from the server via FCM. We send a POST request using the FCM API to send messages.<\/p>\n
4.1 Server Code Example<\/h3>\n
Below is an example of sending messages to FCM from a server using Node.js:<\/p>\n
const express = require('express');\n const admin = require('firebase-admin');\n\n const app = express();\n admin.initializeApp({\n credential: admin.credential.applicationDefault(),\n databaseURL: 'https:\/\/.firebaseio.com'\n });\n\n app.post('\/send', (req, res) => {\n const message = {\n notification: {\n title: 'Hello!',\n body: 'You have received a new message.'\n },\n token: ''\n };\n\n admin.messaging().send(message)\n .then(response => {\n res.send('Successfully sent message: ' + response);\n })\n .catch(error => {\n console.error('Error sending message:', error);\n res.status(500).send('Error sending message');\n });\n });\n\n app.listen(3000, () => {\n console.log('Server is running on port 3000');\n });<\/device_registration_token><\/your-firebase-app><\/code><\/pre>\n5. Testing Push Notification Reception<\/h2>\n
After setting up the mobile app and the server, let’s test the reception of push notifications. Run the app in Android Studio and send a POST request to the server to send a push notification. When the user receives the notification, it should be displayed through the NotificationChannel set in the app.<\/p>\n
6. Optimization and Cautions<\/h2>\n
When integrating push notifications into your service, keep the following points in mind:<\/p>\n
\n- You need to request permission for users to receive notifications.<\/li>\n
- You should ensure that the content of push notifications is meaningful and that users do not receive unwanted information.<\/li>\n
- Be careful with token management (e.g., re-registration) when sending messages.<\/li>\n<\/ul>\n
Conclusion<\/h2>\n
In this course, we explored how to receive push notifications sent from the server to an Android app using Firebase Cloud Messaging (FCM). Utilizing FCM can strengthen communication with users and greatly enhance app usability. Based on what you have learned in this course, try developing more advanced applications.<\/p>\n
<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"
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Through this course, you will learn how to implement push notifications in Android apps using Firebase Cloud Messaging (FCM). … \ub354 \ubcf4\uae30 “course on Kotlin Android app development, receiving notifications sent from the server”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[143],"tags":[],"class_list":["post-36977","post","type-post","status-publish","format-standard","hentry","category-kotlin-android-app-development"],"yoast_head":"\ncourse on Kotlin Android app development, receiving notifications sent from the server - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atmokpo.com\/w\/36977\/\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"course on Kotlin Android app development, receiving notifications sent from the server - \ub77c\uc774\ube0c\uc2a4\ub9c8\ud2b8\" \/>\n<meta property=\"og:description\" content=\"This course will cover how to receive push notifications from a server in Android apps using Kotlin. 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