Envoyer des notifications sur Android 13 (android.permission.POST_NOTIFICATIONS)

MainActivity.kt

// Code utilisé dans la vidéo https://youtu.be/qD2v_eESxzw
class MainActivity : AppCompatActivity() {

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

        findViewById<Button>(R.id.button).setOnClickListener {
            askPermission()
        }

    }

    private fun generateNotification() {
        val notificationManager: NotificationManager =
            getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

        val channelId = "devcafe_channel"
        createChannel(notificationManager, channelId)

        val notification = NotificationCompat.Builder(this, channelId)
            .setSmallIcon(R.drawable.ic_launcher_foreground)
            .setContentTitle("Notification")
            .setContentText("Bonjour à tout le monde")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .build()

        notificationManager.notify(System.currentTimeMillis().toInt(), notification)
    }

    @Suppress("SameParameterValue")
    private fun createChannel(
        notificationManager: NotificationManager,
        channelId: String
    ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            if (notificationManager.getNotificationChannel(channelId) == null) {
                val channel = NotificationChannel(
                    channelId,
                    "Channel DevCafé",
                    NotificationManager.IMPORTANCE_DEFAULT
                ).apply {
                    description = "C'est mal de hardcoder"
                }
                notificationManager.createNotificationChannel(channel)
            }
        }
    }


    private fun askPermission() {
        when {
            ContextCompat.checkSelfPermission(
                this, POST_NOTIFICATIONS
            ) == PackageManager.PERMISSION_GRANTED -> {
                // C'est ok :)
                generateNotification()
            }
            ActivityCompat.shouldShowRequestPermissionRationale(
                this,
                POST_NOTIFICATIONS
            ) -> {
                // Ouvrir les paramètres
                startActivity(Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS).apply {
                    addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                    putExtra(Settings.EXTRA_APP_PACKAGE, packageName)
                })
            }
            else -> {
                // The registered ActivityResultCallback gets the result of this request
                requestPermissionLauncher.launch(
                    POST_NOTIFICATIONS
                )
            }
        }
    }

    private val requestPermissionLauncher = registerForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted: Boolean ->
        if (isGranted) {
            generateNotification()
        } else {
            // TODO
        }
    }
}