flutter - Flutter：数据未使用 PaginatedDataTable 显示在数据表中

Question

我正在尝试使用创建表AdvancedPaginatedDataTable，但数据未显示，而 api 返回数据。

这是代码

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, this.title}) : super(key: key);
  final String? title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  var rowsPerPage = AdvancedPaginatedDataTable.defaultRowsPerPage;
  final source = ExampleSource();
  var sortIndex = 0;
  var sortAsc = true;

  DataRow? getRow(int index) {
    final contact = source.lastDetails!.rows[index];
    return DataRow(cells: [
      DataCell(Text(contact.id.toString())),
      DataCell(Text(contact.companyName)),
      DataCell(Text(contact.firstName)),
      DataCell(Text(contact.lastName)),
      DataCell(Text(contact.phone.toString())),
      
    ]);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title!),
      ),
      body: SingleChildScrollView(
        child: AdvancedPaginatedDataTable(
          getRow: getRow,
          addEmptyRows: false,
          source: source,
          sortAscending: sortAsc,
          sortColumnIndex: sortIndex,
          showFirstLastButtons: true,
          rowsPerPage: rowsPerPage,
          availableRowsPerPage: [10, 20, 30, 50],
          onRowsPerPageChanged: (newRowsPerPage) {
            if (newRowsPerPage != null) {
              setState(() {
                rowsPerPage = newRowsPerPage;
              });
            }
          },
        
          columns: [
            DataColumn(label: Text('ID'), numeric: true, onSort: setSort),
            DataColumn(label: Text('Company'), onSort: setSort),
            DataColumn(label: Text('First name'), onSort: setSort),
            DataColumn(label: Text('Last name'), onSort: setSort),
            DataColumn(label: Text('Phone'), onSort: setSort),
          ],
        ),
      ),
    );
  }

  void setSort(int i, bool asc) => setState(() {
        sortIndex = i;
        sortAsc = asc;
      });
}

class ExampleSource extends AdvancedDataTableSource<Contact> {
  @override
  int get selectedRowCount => 0;

  @override
  Future<RemoteDataSourceDetails<Contact>> getNextPage(NextPageRequest pageRequest) async {
   final queryParameter = <String, dynamic>{
      'offset': pageRequest.offset.toString(),
      'pageSize': pageRequest.pageSize.toString(),
      'sortIndex': ((pageRequest.columnSortIndex ?? 0) + 1).toString(),
      'sortAsc': ((pageRequest.sortAscending ?? true) ? 1 : 0).toString(),
    };
     final requestUri = Uri.http(
      'example.devowl.de',
      '',
      queryParameter,
    );
    
    final response = await http.get(requestUri);
    if (response.statusCode == 200) {
      print(response.body);
      final  books = json.decode(response.body);
      

      return RemoteDataSourceDetails(
        books['totalRows'],
        (books['rows'] as List<dynamic>)
            .map((json) => Contact.fromJson(json))
            .toList(),
      );
    } else {
      throw Exception('Unable to query remote server');
    }

     
  }
}


    print(response.body);

this line prints me the data in console

联系方式.da​​rt

class Contact {
  final int id;
  final String companyName;
  final String firstName;
  final String lastName;
  final int phone;

   Contact({
    required this.id,
   
    required this.firstName,
    required this.companyName,
    required this.lastName,
    required this.phone
  });

  factory Contact.fromJson(Map<String, dynamic> json) => Contact(
        id: json['id'],
        firstName: json['firstName'],
        companyName: json['companyName'],
        lastName: json['lastName'],
        phone: json['phone'],
      );

  Map<String, dynamic> toJson() => {
        'id': id,
       
        'companyName': companyName,
        'firstName': firstName,
        'lastName': lastName,
        'phone': phone,
      };

 
}

输出：

如果有人知道解决方案，请告诉我。