MissingPluginException on nfcAvailability (Android) – works only after device restart

[akhil-ge0rge]

I am getting MissingPluginException (No implementation found for method getNFCAvailability), and NFC starts working again only after restarting the phone.

Device : Samsung Galaxy A23
flutter_nfc_kit: ^3.6.2

void startNfc({required BuildContext context}) async {
  final locale = AppLocalizations.of(context)!;

  final isLocationPermissionEnabled = await context
      .read<LoginViewModel>()
      .checkLocationPermissions(context: context);

  try {
    if (!isLocationPermissionEnabled) {
      log("Location Permission Unavailable");
      debugPrint("Location Permission Unavailable");
      return;
    }

    final NFCAvailability nfcStatus =
        await FlutterNfcKit.nfcAvailability;

    switch (nfcStatus) {
      case NFCAvailability.available:
        break;

      case NFCAvailability.disabled:
        AppUtils.showToast(
          message: locale.nfcDisabled,
          backgroundColor: AppColors.errorToastColor,
          textColor: AppColors.toastTextColor,
        );
        return;

      case NFCAvailability.not_supported:
        AppUtils.showToast(
          message: locale.nfvIsNotSupportedOnThisDevice,
          backgroundColor: AppColors.errorToastColor,
          textColor: AppColors.toastTextColor,
        );
        return;
    }

    try {
      await FlutterNfcKit.finish();
    } catch (e) {
      log("====> $e");
      debugPrint("====> $e");
    }

    if (_isNfcOn) {
      stopNfc();
      return;
    }

    _isNfcOn = true;
    notifyListeners();

    while (_isNfcOn) {
      try {
        final tag = await FlutterNfcKit.poll(
          readIso14443A: true,
          readIso15693: true,
          readIso14443B: true,
          readIso18092: true,
          timeout: const Duration(seconds: 15),
        );

        log("NFC TAG ID ${tag.id}");
        debugPrint("NFC TAG ID ${tag.id}");

        String finalNFCValue;

        if (tag.type == NFCTagType.mifare_classic) {
          // OLD CARD
          final List<int> bytes = [];

          for (int i = 0; i < tag.id.length; i += 2) {
            bytes.add(
              int.parse(tag.id.substring(i, i + 2), radix: 16),
            );
          }

          int decodedValue = 0;
          for (int i = 0; i < bytes.length; i++) {
            decodedValue += bytes[i] * pow(256, i).toInt();
          }

          finalNFCValue = decodedValue.toString();
        } else {
          // NEW CARD
          finalNFCValue = BigInt.parse(tag.id, radix: 16).toString();
        }

        log("🎬 final nfc value $finalNFCValue");
        debugPrint("🎬 final nfc value $finalNFCValue");

        await FlutterNfcKit.finish();

        if (Platform.isIOS) {
          // Avoid iOS popup flood
          await Future.delayed(const Duration(seconds: 2));
        }

        await apiCall(
          cardId: finalNFCValue,
          isNfc: true,
        );
      } on PlatformException catch (e) {
        log(e.toString());
        debugPrint(e.toString());

        if (Platform.isAndroid && e.code == "500") {
          stopNfc();
          AppUtils.showToast(
            message: locale.pleaseRestartYourApp,
            backgroundColor: AppColors.errorToastColor,
            textColor: AppColors.toastTextColor,
          );
        }

        if (e.code == "409") {
          stopNfc();
        }
      } catch (e) {
        log("⚠️ NFC Read Error: $e");
        debugPrint("⚠️ NFC Read Error: $e");

        await FlutterNfcKit.finish();
        await Future.delayed(
          const Duration(milliseconds: 500),
        ); // Small gap before retry
      }
    }
  } catch (e) {
    AppUtils.showToast(
      message: e.toString(),
      backgroundColor: AppColors.errorToastColor,
      textColor: AppColors.toastTextColor,
    );
    log("Session Error: $e");
    debugPrint("Session Error: $e");
  }
}