E/flutter (11662): [错误:flutter/lib/ui/ui_dart_state.cc(186)]
未处理的异常：
NoSuchMethodError：在 null 上调用了 getter 'data'。
E/flutter (11662)：接收器：null
E/flutter (11662)：尝试调用：data
E/flutter (11662): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
E/flutter (11662): #1 _GridHomeState._getGridNews.. (package:indonesia_bisa/Widget/Home/GridView.dart:23:30)
E/flutter (11662)：#2 State.setState
(包:flutter/src/widgets/framework.dart:1267:30)
E/flutter (11662)：#3 _GridHomeState._getGridNews。
(包:indonesia_bisa/Widget/Home/GridView.dart:22:7)
E/flutter (11662): #4 _rootRunUnary (dart:async/zone.dart:1362:47)
E/flutter (11662): #5 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
E/flutter (11662): #6 _FutureListener.handleValue (dart:async/future_impl.dart:152:18)
E/flutter (11662): #7 Future._propagateToListeners.handleValueCallback
(dart:async/future_impl.dart:704:45)
E/flutter (11662): #8 Future._propagateToListeners (dart:async/future_impl.dart:733:32)
E/flutter (11662): #9 Future._completeWithValue (dart:async/future_impl.dart:539:5)
E/flutter (11662): #10 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:254:13)
E/flutter (11662): #11 Api.getGridNews (package:indonesia_bisa/API/API.dart)
E/颤振（11662）：<asynchronous suspension>
E/扑（11662）：
class Sorotan {
String _rc;
String _pesan;
List<Data> _data;
Sorotan({String rc, String pesan, List<Data> data}) {
this._rc = rc;
this._pesan = pesan;
this._data = data;
}
String get rc => _rc;
set rc(String rc) => _rc = rc;
String get pesan => _pesan;
set pesan(String pesan) => _pesan = pesan;
List<Data> get data => _data;
set data(List<Data> data) => _data = data;
Sorotan.fromJson(Map<String, dynamic> json) {
_rc = json['rc'];
_pesan = json['pesan'];
if (json['data'] != null) {
_data = new List<Data>();
json['data'].forEach((v) {
_data.add(new Data.fromJson(v));
});
}
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['rc'] = this._rc;
data['pesan'] = this._pesan;
if (this._data != null) {
data['data'] = this._data.map((v) => v.toJson()).toList();
}
return data;
}
}
class Data {
String _idBerita;
String _idKategori;
String _namaMasjid;
String _namaKategori;
String _gambar;
String _judul;
String _isi;
String _penulis;
String _waktu;
String _status;
Data(
{String idBerita,
String idKategori,
String namaMasjid,
String namaKategori,
String gambar,
String judul,
String isi,
String penulis,
String waktu,
String status}) {
this._idBerita = idBerita;
this._idKategori = idKategori;
this._namaMasjid = namaMasjid;
this._namaKategori = namaKategori;
this._gambar = gambar;
this._judul = judul;
this._isi = isi;
this._penulis = penulis;
this._waktu = waktu;
this._status = status;
}
String get idBerita => _idBerita;
set idBerita(String idBerita) => _idBerita = idBerita;
String get idKategori => _idKategori;
set idKategori(String idKategori) => _idKategori = idKategori;
String get namaMasjid => _namaMasjid;
set namaMasjid(String namaMasjid) => _namaMasjid = namaMasjid;
String get namaKategori => _namaKategori;
set namaKategori(String namaKategori) => _namaKategori = namaKategori;
String get gambar => _gambar;
set gambar(String gambar) => _gambar = gambar;
String get judul => _judul;
set judul(String judul) => _judul = judul;
String get isi => _isi;
set isi(String isi) => _isi = isi;
String get penulis => _penulis;
set penulis(String penulis) => _penulis = penulis;
String get waktu => _waktu;
set waktu(String waktu) => _waktu = waktu;
String get status => _status;
set status(String status) => _status = status;
Data.fromJson(Map<String, dynamic> json) {
_idBerita = json['id_berita'];
_idKategori = json['id_kategori'];
_namaMasjid = json['nama_masjid'];
_namaKategori = json['nama_kategori'];
_gambar = json['gambar'];
_judul = json['judul'];
_isi = json['isi'];
_penulis = json['penulis'];
_waktu = json['waktu'];
_status = json['status'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['id_berita'] = this._idBerita;
data['id_kategori'] = this._idKategori;
data['nama_masjid'] = this._namaMasjid;
data['nama_kategori'] = this._namaKategori;
data['gambar'] = this._gambar;
data['judul'] = this._judul;
data['isi'] = this._isi;
data['penulis'] = this._penulis;
data['waktu'] = this._waktu;
data['status'] = this._status;
return data;
}
}
class GridHome extends StatefulWidget {
@override
_GridHomeState createState() => _GridHomeState();
}
class _GridHomeState extends State<GridHome> {
var listGrid = List<Sorotan>();
var data = List<Data>();
void _getGridNews() async{
Api.getGridNews().then((response){
//perubahan kondisi sesuaidengan jumlah response yang diterima dari webservice
setState(() {
this.data = response.data;
});
});
}
@override
void initState() {
super.initState();
_getGridNews();
}
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.only(top: 62.0.h),
height: 40.h,
width: 100.w,
child: Padding(
padding: EdgeInsets.only(right: 1.5.h,left: 1.5.h,bottom: 16.0.h),
child: GridView.builder(
itemCount: data.length,
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2),
itemBuilder:(BuildContext context, int index) {
return GestureDetector(
onTap: (){
// menampilkan halaman detail
Navigator.push(context, MaterialPageRoute(builder: (context) => DetailNewsScreen(
)));
},
child: Card(
elevation: 10,
color: Colors.grey[200],
child: Container(
child: Image.network(
*data[index].gambar*,
fit: BoxFit.cover,
),
),
),
);
},
),
),
);
}
}
我已经导入了所有需要的东西， 我想把图片放在Gridview上
static Future<Sorotan> getGridNews() async {
var request = http.Request(
'GET',
Uri.parse(
'-----'));
http.StreamedResponse response = await request.send();
if (response.statusCode == 200) {
print(await response.stream.bytesToString());
} else {
print(response.reasonPhrase);
}
}
请帮我解决这个错误