Kotlin Android app development course, creating KakaoTalk notifications

Hello! In this course, we will learn how to develop Android apps using Kotlin. Specifically, we will provide a detailed explanation of how to create KakaoTalk notifications and provide example code. KakaoTalk is a familiar messenger app for many users. Therefore, through this course, you will learn how users can receive notifications in real-time. We will cover everything from setting up the basic Android development environment to sending notifications.

1. Setting Up the Development Environment

To develop Android apps, you first need to set up the development environment. You can follow the steps below.

1.1. Installing Android Studio

Android Studio is the official IDE for developing Android apps. Please install it by following these steps:

  • Go to the official Android Studio website.
  • Download the installation file that matches your operating system.
  • Run the downloaded file and follow the installation wizard.

1.2. Creating a New Project

After installing Android Studio, create a new project:

  • Launch Android Studio.
  • Select “New Project”.
  • Choose “Empty Activity” and click “Next”.
  • Enter the project name and click “Finish” to create the project.

2. Adding Required Libraries

To send KakaoTalk notifications, we will use the Kakao API. You can add dependencies via Gradle. Add the following to your build.gradle file:

dependencies {
    implementation "com.kakao.sdk:v2-user:2.8.0"
    implementation "com.kakao.sdk:v2-push:2.8.0"
}

3. Setting Up KakaoTalk API Key

To use the KakaoTalk API, you need to register your application and obtain an API key. Follow these steps:

  • Visit the Kakao developers site, log in, and register your application.
  • Add the “Android” platform on the app information page and register the package name and hash key.
  • Copy the “Native App Key” from “App Key” in My Applications.

4. Implementing Notification Functionality

Now we will implement the functionality to send KakaoTalk notifications. Follow these steps.

4.1. Configuring AndroidManifest.xml

Set the permissions required to send notifications. Add the following permissions to your AndroidManifest.xml file:

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="com.kakao.talk.authorization" />

4.2. Writing Notification Sending Code

Write the code to send notifications in the MainActivity.kt file. Refer to the example code below:

import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import com.kakao.sdk.common.KakaoSdk
import com.kakao.sdk.talk.TalkApiClient
import com.kakao.sdk.talk.model.TalkApiResponse
import com.kakao.sdk.talk.model.TalkMessage
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Initialize KakaoTalk SDK
        KakaoSdk.init(this, "YOUR_NATIVE_APP_KEY")

        sendKakaoTalkMessage()
    }

    private fun sendKakaoTalkMessage() {
        val message = TalkMessage("Sending notification to a friend.", "https://example.com/image.png")

        TalkApiClient.instance.sendMessage(message).enqueue(object : Callback {
            override fun onResponse(call: Call, response: Response) {
                Log.d("KakaoTalk", "Message sent: " + response.body())
            }

            override fun onFailure(call: Call, t: Throwable) {
                Log.e("KakaoTalk", "Message failed: " + t.message)
            }
        })
    }
}

5. Receiving User Push Notifications

Now we need to implement the functionality for users to receive notifications. We will use Firebase Cloud Messaging (FCM) service for this.

5.1. Setting Up Firebase

  • Go to the Firebase Console and create a new project.
  • Register the Android app and download the Google services JSON file, then add it to the app directory of your project.

5.2. Adding FCM Library

Add the following to your build.gradle (Module: app) file:

dependencies {
    implementation 'com.google.firebase:firebase-messaging:21.0.1'
}

5.3. Implementing the Service

Implement a service to handle FCM messages for receiving push notifications. Create a class like below:

import com.google.firebase.messaging.FirebaseMessagingService
import com.google.firebase.messaging.RemoteMessage

class MyFirebaseMessagingService : FirebaseMessagingService() {
    override fun onMessageReceived(remoteMessage: RemoteMessage) {
        super.onMessageReceived(remoteMessage)
        // Handle the notification
    }
}

6. Conclusion

Now we have learned how to implement KakaoTalk notifications in an Android app using Kotlin. This course covered various topics, including setting up the development environment, integrating the Kakao SDK, and sending and receiving notifications. This process will be very helpful in actual development. Now you can also utilize the KakaoTalk notification feature in your own Android app!

Thank you!