toJson method

@override Map toJson()

转换为Map

Implementation

@override
Map toJson() {
  Map<String, dynamic> result = {
    "adUnitId": adUnitId,
    "orientation": orientation,
    "muted": muted,
    "volume": volume,
    "useSurfaceView": useSurfaceView
  };

  result.removeWhere((key, value) => value == null);

  return result;
}