isPermissionGranted method Null safety

Future<bool?> isPermissionGranted()

Returns the status of the Do not Disturb access permission for this app.

bool? isPermissionGranted = await RealVolume.isPermissionGranted();

Implementation

static Future<bool?> isPermissionGranted() async {
  if (Platform.isIOS) return null;
  final bool result =
      (await _methodChannel.invokeMethod('isPermissionGranted')) ?? false;
  return result;
}