[Android] 로컬 푸시 알림 테스트

1. AndroidManifest.xml 수정

[경로] app.manifests.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <!-- (필수) Android 13 이상부터 필수로 알림을 사용자에게 보여주려면 권한 요청이 필요하다. 해당 퍼미션이 없을 경우 푸시 알림이 와도 상단에 표시되지 않는다. -->
    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.STOCK"
        tools:targetApi="31">

        <activity
            android:name=".MainActivity"
            android:exported="true"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

2. MyPushNotificationService.kt

[경로] com.project.project_name.service.MyPushNotificationService.kt

class MyPushNotificationService(private val context: Context) {
    fun sendPushNotification(title: String, body: String) {
        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val channel = NotificationChannel(
                "default_channel", // Channel ID
                "Default Channel", // Channel NAME
                NotificationManager.IMPORTANCE_DEFAULT
            )

            notificationManager.createNotificationChannel(channel)
        }

        val notification = NotificationCompat.Builder(context, "default_channel")
            .setContentTitle(title) // 알림 제목
            .setContentText(body) // 알림 본문
            .setSmallIcon(R.drawable.ic_notifications_black_24dp) // 알림 아이콘
            .setAutoCancel(true) // 클릭 시 자동으로 알림 제거
            .build()

        notificationManager.notify(0, notification)
    }
}

3. MotificationPermissionHelper.kt

[경로] com.project.project_name.util.NotificationPermissionHelper.kt

object NotificationPermissionHelper {
     fun requestNotificationPermission(activity : Activity) {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
            val permission = Manifest.permission.POST_NOTIFICATIONS
            val granted = ContextCompat.checkSelfPermission(activity, permission) == PackageManager.PERMISSION_GRANTED

            if(!granted) {
                ActivityCompat.requestPermissions(activity, arrayOf(permission), 1001)
            }
        }
    }
}

4. MainActivity.kt

[경로] com.project.project_name.MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val navController = findNavController(R.id.nav_host_fragment_activity_main)

        val navView : BottomNavigationView = binding.navView
        navView.setupWithNavController(navController)

        // 알림 권한 요청
        NotificationPermissionHelper.requestNotificationPermission(this)

        // 로컬 푸시 알림 로직
        val pushNotificationService = MyPushNotificationService(this)
        pushNotificationService.sendPushNotification("푸시 알림 테스트입니다.", "본문 내용")
    }
}