getMaxVol method Null safety

Future<int?> getMaxVol(
  1. StreamType streamType
)

Returns max volume for a streamType

int notificationMaxVol = await RealVolume.getMaxVol(StreamType.NOTIFICATION);

Implementation

static Future<int?> getMaxVol(StreamType streamType) async {
  final int? version = await _methodChannel
      .invokeMethod('getMaxVol', {'streamType': streamType.index});
  return version;
}