MainActivity.kt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            NotificationsSampleAppTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                        Column(
                            verticalArrangement = Arrangement.Center,
                            horizontalAlignment = Alignment.CenterHorizontally
                        ) {
                            RequestNotificationPermission()
                        }
                    }
                }
            }
        }
    }

@RequiresApi(Build.VERSION_CODES.TIRAMISU)
@OptIn(ExperimentalPermissionsApi::class)
@Composable
private fun RequestNotificationPermission() {
    val notificationPermissionState =
        rememberPermissionState(android.Manifest.permission.POST_NOTIFICATIONS)
    if (notificationPermissionState.status.isGranted) {
        Text("Notification permission Granted")
    } else {
        Column {
            val textToShow = if (notificationPermissionState.status.shouldShowRationale) {
                "The notification permission is important for this app. Please grant the permission."
            } else {
                "notifications not available"
            }

            Text(textToShow)
            Spacer(modifier = Modifier.height(8.dp))
            Button(onClick = { notificationPermissionState.launchPermissionRequest() }) {
                Text("Request permission")
            }
        }
    }
}