我想通过API创建商品，因此我使此函数调用了createoffre函数下方的API
Future<dynamic> createOffre(String type , String title , int categorie , bool financial_contrib,
bool emploi , int niveau , int poste , int profil , int sexe , int sport) async {
Response response = await this
.dio
.post(Uri.encodeFull(this.appConfig.baseUrl + "/node"),
data: {
"type": type,
"title": [
{
"value": title
}
],
"field_categorie": [
{
"target_id": categorie
}
],
"field_financial_contrib": [
{
"value": financial_contrib
}
],
"field_emploi_possible": [
{
"value": emploi
}
],
"field_niveau": [
{
"target_id": niveau
}
],
"field_postes": [
{
"target_id": poste
}
],
"field_profil_recherche": [
{
"target_id": profil
}
],
"field_sexe": [
{
"target_id": sexe
}
],
"field_sport": [
{
"target_id": sport
}
]
},
);
if (response.statusCode == 200){
print("done");
return true;
}else{
print("error");
return false;
}
/*print(this
.cookieJar
.loadForRequest(Uri.parse(this.appConfig.baseUrl + "/node")));
print("Response ${response.data}");*/
//return response;
}
///////////////////////////////////////////////// ///////////////////////////////////////////////////// 所以当我在AddOffer文件中进行函数调用时
您可以在下面找到函数调用的代码
onPressed: () async {
if (_formKey.currentState.validate()) {
_formKey.currentState.save();
final dynamic response =
await offreManger.createOffre(
"offre_club",
_controllerTitre.text,
int.parse(selectedIdcategorie),
true,
true,
int.parse(selectedIdlevel),
1, 1, int.parse(selectedIdSexe),
int.parse(selectedIdSport)
);
if (response != false) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) {
return ProfileObject();
},
fullscreenDialog: false,
),
);
} else {
return AwesomeDialog(
context: context,
dialogType: DialogType.ERROR,
animType: AnimType.SCALE,
headerAnimationLoop: false,
title: 'Erreur',
desc: "verifier vos identifiants",
btnOkOnPress: () {},
btnOkColor: Colors.red)
.show();
}
return;
}
},
///////////////////////////////////////////////// //////////////////////////////////////////////////// /
当我验证表格并按下按钮以执行功能时，出现以下错误 那我该怎么办
E/flutter (24391): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: NoSuchMethodError: The method 'createOffre' was called on null.
E/flutter (24391): Receiver: null
E/flutter (24391): Tried calling: createOffre("offre_club", "ee", 230, true, true, 131, 1, 1, 130, 1)
E/flutter (24391): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
E/flutter (24391): #1 _AjouterOffreFormState.build.<anonymous closure> (package:monmercato_app/Widgets/OffreWidget/AjouterOffreForme.dart:207:53)
E/flutter (24391): #2 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
E/flutter (24391): #3 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
E/flutter (24391): #4 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
E/flutter (24391): #5 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
E/flutter (24391): #6 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
E/flutter (24391): #7 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:219:7)
E/flutter (24391): #8 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:477:9)
E/flutter (24391): #9 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:78:12)
E/flutter (24391): #10 PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:124:9)
E/flutter (24391): #11 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
E/flutter (24391): #12 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:122:18)
E/flutter (24391): #13 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:108:7)
E/flutter (24391): #14 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:220:19)
E/flutter (24391): #15 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
E/flutter (24391): #16 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
E/flutter (24391): #17 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
E/flutter (24391): #18 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
E/flutter (24391): #19 _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (24391): #20 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (24391): #21 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (24391): #22 _invoke1 (dart:ui/hooks.dart:267:10)
E/flutter (24391): #23 _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)
E/flutter (24391):
答案 0 :(得分：0)
方法'createOffre'在null上调用。
您的变量offreManger是null。一定不是。您必须在某个地方进行初始化，无论是在声明的地方，还是在initState或任何您想执行的地方，但是必须在调用它的函数之前将其初始化为某种东西。