getCurrentVol method Null safety

Future<double?> getCurrentVol(
  1. StreamType streamType
)

Returns current volume for a streamType in percentage(from 0.0 to 1.0).

double currentVolume = await RealVolume.getCurrentVol(StreamType.NOTIFICATION);

Implementation

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