_InternalLinkedHashMap<dynamic，dynamic>‘不是'Map<String，dynamic>’类型的子类型

Question

我有一个错误，这是我的API包装器

    if (method == "get") {
      var param = '';

      Map<String, dynamic> params =
          data['params'] != null ? data['params'] : {};
      params.forEach((k, v) => param += k + "=" + (v == null ? '' : v) + "&");
      try {
        Dio dio = new Dio();
        dio.options.headers = headers;
        final response = await dio.get(url + "?" + param);
        responseJson = _response(response);
        //print('Response ' + response.data.toString());
      } on SocketException {
        throw FetchDataException('Tidak terhubung ke server');
      }
  . . .

这是存储库：

  Future<LeaveListModel> fetchResponse(query) async {
    final response = await _wrapper.apiRequest(
        "get", _wrapper.leaveListGetData, {'params': query}, true);
    return LeaveListModel.fromJson(response);
  }

如果您想知道的话，这就是服务：

class Service {
  GetStorage localData = GetStorage();

  final String initial = "Service";
  final String baseUrl = ConstantConfig().leaveListEndPoint;
  final String appCode = ConstantConfig().leaveListAppCode;
  final String outputType = "json";
  final String routeAuthConnect = "auth/connect/";
  final String routeAuthGetAccessToken = "auth/getAccessToken/";

  final String leaveListGetData = "list/";

  Future<dynamic> apiRequest(
      String method, String route, Map<String, dynamic> data,
      [bool needToken = false]) async {
    ApiWrapper _apiWrapper = ApiWrapper();
    if (needToken) {
      int thisTime = (DateTime.now().millisecondsSinceEpoch / 1000).round();
      String? savedExpired = localData.read(initial + KeyStorage.accessExpired);
      int expire = savedExpired == null ? 0 : int.parse(savedExpired);
      if (expire < thisTime) {
        dynamic tokenResponse = await _apiWrapper.request(baseUrl, initial,
            appCode, outputType, 'post', routeAuthGetAccessToken, {});
        await localData.write(initial + KeyStorage.accessToken,
            tokenResponse['response']['access_token']);
        return await _apiWrapper.request(
            baseUrl, initial, appCode, outputType, method, route, data);
      } else {
        return await _apiWrapper.request(
            baseUrl, initial, appCode, outputType, method, route, data);
      }
    } else {
      return await _apiWrapper.request(
          baseUrl, initial, appCode, outputType, method, route, data);
    }
  }
}

我只想调用一个json文件，但是它显示了一个错误，我不知道我的代码有什么问题，如果您知道如何修复它，请告诉我

这是一个错误：

  I/flutter (20696): Call https:xxxxxxxxxxxx
   I/flutter (20696): type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'

另一个错误说明：

I/flutter ( 7626): {}
I/flutter ( 7626): 1
I/flutter ( 7626): type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'
I/flutter ( 7626): {}
I/flutter ( 7626): 1
I/flutter ( 7626): type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, dynamic>'

实际上，这表明进程在Map<String, dynamic> params = data['params'] != null ? data['params'] : {};上停止了，因为我尝试用print('1');、print('2');、print('3');调试API包装器，只是为了显示进程在哪里停止并得到错误。

Answer 1

您需要decode您的响应，然后使用它：

LeaveListModel.fromJson(jsonDecode(response));

此外，我认为您正在将编码的query传递给ApiWrapper，因此您需要像这样对其进行解码：

Map<String, dynamic> params = data['params'] != null ? jsonDecode(data['params']) : {};

Answer 2

return LeaveListModel.fromJson(response);

在我看来，您应该在这里使用response.data，而不是响应。

return LeaveListModel.fromJson(response.data);

Answer 3

试试这个：

Map<String, dynamic>.from(yourData)