A simple function utilizing `in_app_update` package to check for any available updates on Android

main.dart

import 'package:in_app_update/in_app_update.dart';

/// Check for updates and start the update process if available
///
/// Returns the result of the update process or null if no update is available
///
/// For priority 0 - 3, the update process is started in the background and the
/// user is not interrupted. The update will be installed the next time the app
/// is opened.
///
/// For priority 4 or 5, the update process is started immediately and the user
/// is interrupted. The update will be installed before the app is resumed.
///
Future<AppUpdateResult?> checkForUpdate() async {
  if (!Platform.isAndroid) return null;
  final info = await InAppUpdate.checkForUpdate();
  if (!info.isUpdateAvailable) {
    return null;
  }
  final priority = info.updatePriority;
  // 0 - 3 are flexible updates, 4 or 5 is immediate
  if (priority < 4) {
    return InAppUpdate.startFlexibleUpdate();
  }
  return InAppUpdate.performImmediateUpdate();
}

extension on AppUpdateInfo {
  bool get isUpdateAvailable =>
      updateAvailability == UpdateAvailability.updateAvailable;
}

Please add the following line to prevent throwing UnimplementedError

if (!Platform.isAndroid) return null;