如何為API回傳的XML序列化/制作類

我正在呼叫以XML格式回傳的 API。

我選擇保留資料XML而不轉換為Json.

我正在接收回傳的資料和instance回傳的每個資料串列。

我有一個基本的 XML 類來從中獲取一條資料。

我需要擴展它以獲取 alat, long和其他一些資料。

是否有像 Quicktype.io 這樣的 XML 自動化服務Json？我找不到一個并且不確定如何構建我的Class

這是我的電話

try{
    var response = await client.get(Uri.parse(
      'https_call'));   
    if (response.statusCode == 200) {
  
  final doc = XmlDocument.parse(utf8.decode(response.bodyBytes));
  final vehicleActivity = doc
      .findAllElements('VehicleActivity')
      .map((e) => VehicleActivity.fromElement(e))
      .toList();
  print(vehicleActivity);

哪些功能。

到目前為止我的課

import 'package:xml/xml.dart';

class VehicleActivity {
  VehicleActivity({
    this.recordedAtTime,
    this.itemIdentifier,
    this.validUntilTime,
  });

  DateTime? recordedAtTime;
  String? itemIdentifier;
  DateTime? validUntilTime;

  factory VehicleActivity.fromElement(XmlElement vaElement) => VehicleActivity(
        recordedAtTime: DateTime.parse(
          vaElement.findElements('RecordedAtTime').first.text,
        ),
        itemIdentifier: vaElement.findElements('ItemIdentifier').first.text,
        validUntilTime: DateTime.parse(
          vaElement.findElements('ValidUntilTime').first.text,
        ),
      );
}

回傳的 XML 示例（我需要呼叫 lat、long 和其他一些資料，具體取決于）

<VehicleActivity>
<RecordedAtTime>2022-01-18T14:16:17 00:00</RecordedAtTime>
<ItemIdentifier>f452f348-72f2-4bc4-b7d8-de65e591cf70</ItemIdentifier>
<ValidUntilTime>2022-01-18T14:22:14.063676</ValidUntilTime>
<MonitoredVehicleJourney>
<LineRef>4</LineRef>
<DirectionRef>inbound</DirectionRef>
<FramedVehicleJourneyRef>
<DataFrameRef>2022-01-18</DataFrameRef>
<DatedVehicleJourneyRef>4_20220118_14_15</DatedVehicleJourneyRef>
</FramedVehicleJourneyRef>
<PublishedLineName>4</PublishedLineName>
<OperatorRef>FTVA</OperatorRef>
<DestinationRef>4900801620</DestinationRef>
<VehicleLocation>
<Longitude>-0.720648</Longitude>
<Latitude>51.518651</Latitude>
</VehicleLocation>
<BlockRef>701130</BlockRef>
<VehicleRef>69388</VehicleRef>
</MonitoredVehicleJourney>
<Extensions>
<VehicleJourney>
<Operational>
<TicketMachine>
<TicketMachineServiceCode>B4</TicketMachineServiceCode>
<JourneyCode>1420</JourneyCode>
</TicketMachine>
</Operational>
<VehicleUniqueId>69388</VehicleUniqueId>
<DriverRef>701130</DriverRef>
</VehicleJourney>
</Extensions>
</VehicleActivity>

謝謝

更新已嘗試構建一個用于提取的類Lat,long。錯誤

    Exception Happened: Bad state: No element
    

應該String是Double?？我無法獲得雙重功能

import 'package:xml/xml.dart';
  
  class VehicleLocation{
    VehicleLocation({
    this.latitude,
    this.longitude,
    });
    
    String? latitude;
    String? longitude;

    factory VehicleLocation.fromElement(XmlElement vaElement) => VehicleLocation(
        latitude: vaElement.findElements('latitude').first.text,
        longitude: vaElement.findElements('longitude').first.text,
    );

  }

經調整的呼叫測驗

final doc = XmlDocument.parse(utf8.decode(response.bodyBytes));
  final vehicleActivity = doc
      .findAllElements('Latitude')
      .map((e) => VehicleLocation.fromElement(e))
      .toList();
  print(vehicleActivity);

更新#2

I am calling the fetch and then implementing a mapmarker. The future to call and then place the marker is returning issues on vehicleactivity such as

    The type 'VehicleActivity' used in the 'for' loop must implement Iterable.

Future<void> showMapMarkers() async {
    _unTiltMap();

    var vehicleActivity = await fetchLiveLocations();
  for (VehicleActivity vehicleActivity in vehicleActivity!) {
    GeoCoordinates geoCoordinates = GeoCoordinates (vehicleActivity.latitude, vehicleActivity.latitude);
    
    _addMapMarker(geoCoordinates, 1);
  
  }
}

This same method has worked well for me with different API calls returning Json. Thank you

uj5u.com熱心網友回復：

將您的課程更新為：

class VehicleActivity {
  VehicleActivity({
    this.recordedAtTime,
    this.itemIdentifier,
    this.validUntilTime,
    this.latitude,
  });

  DateTime? recordedAtTime;
  String? itemIdentifier;
  DateTime? validUntilTime;
  double? latitude;

  factory VehicleActivity.fromElement(XmlElement vaElement) => VehicleActivity(
        recordedAtTime: DateTime.parse(
          vaElement.findElements('RecordedAtTime').first.text,
        ),
        itemIdentifier: vaElement.findElements('ItemIdentifier').first.text,
        validUntilTime: DateTime.parse(
          vaElement.findElements('ValidUntilTime').first.text,
        ),
        latitude:
            double.tryParse(vaElement.findAllElements('Latitude').first.text),
      );
}

請注意，您需要使用findAllElementsbecause Latitudeis inside a tag <VehicleLocation>。同樣，您可以找到VehicleLocation標簽，然后在其中找到緯度/經度標簽。

我認為，如果您格式化 XML（例如在您的 IDE 或瀏覽器中）以傳統方式縮進它，它將幫助您更好地可視化資料。

            <VehicleActivity>
                <RecordedAtTime>2021-12-03T18:10:01 00:00</RecordedAtTime>
                <ItemIdentifier>ad2c7031-ceac-4e7c-bc0c-9e667ad00dfe</ItemIdentifier>
                <ValidUntilTime>2021-12-03T18:16:05.408968</ValidUntilTime>
                <MonitoredVehicleJourney>
                    <LineRef>4</LineRef>
                    <DirectionRef>inbound</DirectionRef>
                    <FramedVehicleJourneyRef>
                        <DataFrameRef>2021-12-03</DataFrameRef>
                        <DatedVehicleJourneyRef>4_20211203_18_04</DatedVehicleJourneyRef>
                    </FramedVehicleJourneyRef>
                    <PublishedLineName>4</PublishedLineName>
                    <OperatorRef>FTVA</OperatorRef>
                    <DestinationRef>03700324</DestinationRef>
                    <VehicleLocation>
                        <Longitude>-0.719601</Longitude>
                        <Latitude>51.520305</Latitude>
                    </VehicleLocation>
                    <Bearing>30.0</Bearing>
                    <BlockRef>801312</BlockRef>
                    <VehicleRef>69921</VehicleRef>
                </MonitoredVehicleJourney>

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