How Serialize GeoPoint flutter?-CodePudding

flutter pub run build_runner build gives an error on geoPoint. Error says: To support the type GeoPoint you can: Use JsonConverter. How can I implement it?

class

 ...
@JsonSerializable()
class Person{
  late final String name;
  final List<Location> location;

  Person(
      {required this.uid,
      required this.name,
      required this.location});

  factory Person.fromJson(Map<String, dynamic> json) => _$PersonFromJson(json); 
  Map<String, dynamic> toJson() => _$PersonToJson(this);
}

@JsonSerializable()
class Location {
  String name;
  GeoPoint geoPoint;

  Location({required this.name, required this.geoPoint});
  factory Location.fromJson(Map<String, dynamic> json) =>
      _$LocationFromJson(json);

  Map<String, dynamic> toJson() => _$LocationToJson(this);
}

CodePudding user response：

Example for Colors :

@JsonSerializable()
class Line {
  Line({required this.name, required this.color});

  factory Line.fromJson(Map<String, dynamic> json) => _$LineFromJson(json);

  String name;

  @ColorSerializer()
  Color color;
  

  Map<String, dynamic> toJson() => _$LineToJson(this);
}

class ColorSerializer implements JsonConverter<Color, int> {
  const ColorSerializer();

  @override
  Color fromJson(int json) => Color(json);

  @override
  int toJson(Color color) => color.value;
}

Your Code should be something like this:

@JsonSerializable()
class Line {
  Line({required this.name, required this.color});

  factory Line.fromJson(Map<String, dynamic> json) => _$LineFromJson(json);

  String name;

  @GeoPointSerializer()
  GeoPoint geoPoint;
  

  Map<String, dynamic> toJson() => _$LineToJson(this);
}

class GeoPointSerializer implements JsonConverter<GeoJson, List<int,int>> {
  const GeoPointSerializer();

  @override
  GeoPoint fromJson(List<int,int> json) => GeoPoint(x:json[0],json[1]);

  @override
  List<int,int> toJson(GeoPoint geoPoint) => [geoPoint.x,geoPoint.y];
}