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json - 如何在颤动中解析这个 Json 数据

问题描述

如何将以下 JSON 文件处理为 LatLong 列表，我已经阅读了许多教程但它无法正常工作，我必须列出以下纬度和经度点

'''

{
  "snappedPoints": [
    {
      "location": {
        "latitude": -35.2784167,
        "longitude": 149.1294692
      },
      "originalIndex": 0,
      "placeId": "ChIJoR7CemhNFmsRQB9QbW7qABM"
    },
    {
      "location": {
        "latitude": -35.280321693840129,
        "longitude": 149.12908274880189
      },
      "originalIndex": 1,
      "placeId": "ChIJiy6YT2hNFmsRkHZAbW7qABM"
    }
  ]
}

'''

标签： jsonflutterdart

解决方案

你好刚到这个网站：

https://app.quicktype.io/

选择“Dart”语言，它将为您创建课程！

import 'package:meta/meta.dart';
import 'dart:convert';

SnappedPoints snappedPointsFromJson(String str) => SnappedPoints.fromJson(json.decode(str));

String snappedPointsToJson(SnappedPoints data) => json.encode(data.toJson());

class SnappedPoints {
    final List<SnappedPoint> snappedPoints;

    SnappedPoints({
        @required this.snappedPoints,
    });

    factory SnappedPoints.fromJson(Map<String, dynamic> json) => SnappedPoints(
        snappedPoints: List<SnappedPoint>.from(json["snappedPoints"].map((x) => SnappedPoint.fromJson(x))),
    );

    Map<String, dynamic> toJson() => {
        "snappedPoints": List<dynamic>.from(snappedPoints.map((x) => x.toJson())),
    };
}

class SnappedPoint {
    final Location location;
    final int originalIndex;
    final String placeId;

    SnappedPoint({
        @required this.location,
        @required this.originalIndex,
        @required this.placeId,
    });

    factory SnappedPoint.fromJson(Map<String, dynamic> json) => SnappedPoint(
        location: Location.fromJson(json["location"]),
        originalIndex: json["originalIndex"],
        placeId: json["placeId"],
    );

    Map<String, dynamic> toJson() => {
        "location": location.toJson(),
        "originalIndex": originalIndex,
        "placeId": placeId,
    };
}

class Location {
    final double latitude;
    final double longitude;

    Location({
        @required this.latitude,
        @required this.longitude,
    });

    factory Location.fromJson(Map<String, dynamic> json) => Location(
        latitude: json["latitude"].toDouble(),
        longitude: json["longitude"].toDouble(),
    );

    Map<String, dynamic> toJson() => {
        "latitude": latitude,
        "longitude": longitude,
    };
}

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