isInstalled method

Implementation

Future<bool?> isInstalled(String packageName) async {
  if (kIsWeb) {
    return null;
  }
  if (Platform.isIOS) {
    return await canLaunchUrl(Uri.parse('$packageName://'));
  }
  if (Platform.isAndroid) {
    return await _platform.invokeMethod<bool>(
      'installation_checker/is_installed',
      {
        'package_name': packageName,
      },
    );
  }
  return null;
}