小贝子编程

未处理的异常：NoSuchMethod错误：在 null 上调用了 getter 'text'



我可以使用提供程序。。。。方法名称是createResgister，因此这是返回包含响应的Future的方法。好的，里面有我想要发布的每个表单的TextEditingController，还有我想要发布它的api

然后我创建了两个方法passRegister((和registerFom((：所以registerForm是在_futureRegister…内注册TextFormField。。。。passRegister正在将createRegister分配给_futureRegister。。。。。老实说，我不知道这个逻辑是否合理。。

`import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:logistics_app/models/registerApi.dart';
import 'package:logistics_app/ui/dashboard_view.dart';
import 'package:logistics_app/utils/validation.dart';
import 'package:http/http.dart' as http;
import '../ui/login_view.dart';

class UserOnboardingModel extends ChangeNotifier with ValidationMixin{
TextEditingController firstController;
TextEditingController lastController;
TextEditingController passwordController;
TextEditingController emailController;
TextEditingController phoneController;
bool showPassword = true;
final formKey = GlobalKey<FormState>();
Future<RegisterModel> _futureRegister;
Future<RegisterModel> createRegister()async{
final http.Response response = await http.post(
"apiKey",
body: jsonEncode(<String, String>{
'firstName' : validateFirstName(firstController.text),
'lastName' : validateLastName(lastController.text),
'emailAddress' : validateEmail(emailController.text),
'phoneNumber' : validatePhoneNumber(phoneController.text),
'password' : validatePassword(passwordController.text)
})
);
if(response.statusCode == 201){
return RegisterModel.fromJson(json.decode(response.body));
}else{
throw Exception('Failed to create Register');
}
}
void passRegister(){
_futureRegister = createRegister();
}
void registerForm(){
FutureBuilder<RegisterModel>(
future: _futureRegister,
builder: (context, snapshot){
if(snapshot.hasData){
return Column(
children: [
Text(snapshot.data.firstName),
Text(snapshot.data.lastName),
Text(snapshot.data.emailAddress),
Text(snapshot.data.phoneNumber),
Text(snapshot.data.password)
],
);
}else if(snapshot.hasError){
return Text("${snapshot.error}");
}
return CircularProgressIndicator();
},
);
}
void togglePassword(){
showPassword = !showPassword;
notifyListeners();
}
void validateForm(){
formKey.currentState.validate();
}
void moveToLogin(context){
//go to login page
if(formKey.currentState.validate()){
Navigator.pushNamed(context, LogIn.LOG_IN_ROUTE);
}
else{
Fluttertoast.showToast(
msg: "Please Fill The Form",
toastLength: Toast.LENGTH_LONG,
gravity: ToastGravity.BOTTOM,
timeInSecForIosWeb: 5,
backgroundColor: Colors.black,
);
}
}
void moveToDashBoardView(context){
//go to login page
if(formKey.currentState.validate()){
Navigator.push(context, MaterialPageRoute(
builder: (context) => DashboardView()
));
}
else{
Fluttertoast.showToast(
msg: "Please Fill The Form",
toastLength: Toast.LENGTH_LONG,
gravity: ToastGravity.BOTTOM,
timeInSecForIosWeb: 5,
backgroundColor: Colors.black,
);
}
}
void moveToSignup(){
//go to sign up page
notifyListeners();
}
void moveToForgottenPassword(){
//go to forgotten password page
notifyListeners();
}
}`

现在这是我想要发布的表单类型的Register模型或json模型

import 'dart:convert';
import 'package:http/http.dart' as http;
class RegisterModel {
String phoneNumber;
String emailAddress;
String firstName;
String lastName;
String password;
RegisterModel(
{this.phoneNumber,
this.emailAddress,
this.firstName,
this.lastName,
this.password});
RegisterModel.fromJson(Map<String, dynamic> json) {
phoneNumber = json['phoneNumber'];
emailAddress = json['emailAddress'];
firstName = json['firstName'];
lastName = json['lastName'];
password = json['password'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['phoneNumber'] = this.phoneNumber;
data['emailAddress'] = this.emailAddress;
data['firstName'] = this.firstName;
data['lastName'] = this.lastName;
data['password'] = this.password;
return data;
}
}

但是我收到一个错误

D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144): 
D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144): 
D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144): 
D/EGL_emulation( 5144): eglMakeCurrent: 0xec226560: ver 3 0 (tinfo 0xee67fcb0)
D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144): 
E/flutter ( 5144): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: NoSuchMethodError: The getter 'text' was called on null.
E/flutter ( 5144): Receiver: null
E/flutter ( 5144): Tried calling: text
E/flutter ( 5144): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
E/flutter ( 5144): #1      UserOnboardingModel.createRegister (package:logistics_app/models/userOnboardingModel.dart:31:59)
E/flutter ( 5144): #2      UserOnboardingModel.passRegister (package:logistics_app/models/userOnboardingModel.dart:46:23)
E/flutter ( 5144): #3      _buildCircleAvatar.<anonymous closure>.<anonymous closure> (package:logistics_app/ui/sign_up_view.dart:241:18)
E/flutter ( 5144): #4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:992:19)
E/flutter ( 5144): #5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1098:38)
E/flutter ( 5144): #6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:184:24)
E/flutter ( 5144): #7      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:524:11)
E/flutter ( 5144): #8      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:284:5)
E/flutter ( 5144): #9      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:256:7)
E/flutter ( 5144): #10     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:158:27)
E/flutter ( 5144): #11     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:224:20)
E/flutter ( 5144): #12     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:200:22)
E/flutter ( 5144): #13     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:158:7)
E/flutter ( 5144): #14     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:104:7)
E/flutter ( 5144): #15     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:88:7)
E/flutter ( 5144): #16     _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter ( 5144): #17     _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter ( 5144): #18     _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter ( 5144): #19     _invoke1 (dart:ui/hooks.dart:267:10)
E/flutter ( 5144): #20     _dispatchPointerDataPacket (dart:ui/hooks.dart:176:5)
E/flutter ( 5144): 
D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144): 
D/skia    ( 5144): Shader compilation error
D/skia    ( 5144): ------------------------
D/skia    ( 5144): Errors:
D/skia    ( 5144):

所以伙计们，我在这里要做的一切都是尝试在createRegister()中发布一个表单注册api

不是我在我的整个代码中使用提供商

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:logistics_app/models/registerApi.dart';
import 'package:logistics_app/models/userOnboardingModel.dart';
import 'package:provider/provider.dart';
import 'package:logistics_app/ui/login_view.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';
import '../models/userOnboardingModel.dart';

class SignUpView extends StatelessWidget{
static const String SIGN_UP_ROUTE = "/signup";
@override
Widget build(BuildContext context){
return Scaffold(
backgroundColor: Colors.white,
body: _buildBody(context),
);
}
}
Future<RegisterModel> _futureRegister;
Widget _buildBody(context){
return SingleChildScrollView(
child: Padding(padding: EdgeInsets.only(left: 32.0, top: 80.0,right:32.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text('Signup',
style: TextStyle(
fontFamily: 'PlayfairDisplay',
fontSize: 38.0,
fontStyle: FontStyle.normal,
fontWeight: FontWeight.normal,
color: Colors.black,),),
SizedBox(height: 16.0,),
_buildButtonRow(),
SizedBox(height: 36.0,),
Text('or',
style: TextStyle(
fontFamily: 'Gordita',
fontWeight: FontWeight.normal,
fontSize: 12.0,
),
),
Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => Form(
key: mValue.formKey,
child: Column(
children: [
SizedBox(height: 29.0,),
_buildNameField(),
SizedBox(height: 63.0,),
_buildEmailField(),
SizedBox(height: 67.0,),
_buildPasswordField(),
SizedBox(height: 69.0,),
_buildPhonenumber(),
SizedBox(height: 51.0,),
_buildCircleAvatar(),
SizedBox(height: 60.8,),
_buildFirstText(),
SizedBox(height: 12.0,),
_buildLoginText(context),
SizedBox(height: 40.0,),
],
),
),
)
],
),),
);
}
Widget _buildButtonRow(){
return SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
FlatButton(
child: Container(
height: 50.0,
width: 130.0,
child: Center(
child: Text('GOOGLE',
style: TextStyle(
fontFamily: 'Lato',
fontSize: 12.0,
fontWeight: FontWeight.normal,),),
),
decoration: BoxDecoration(
color: Color(0xFFF5F6FA),
borderRadius: BorderRadius.circular(5.0),
),
),
onPressed: (){},
),
FlatButton(
child: Container(
height: 50.0,
width: 130.0,
child: Center(
child: Text('FACEBOOK',
style: TextStyle(
fontFamily: 'Lato',
fontSize: 12.0,
fontWeight: FontWeight.normal,
),),
),
decoration: BoxDecoration(
color: Color(0xFFF5F6FA),
borderRadius: BorderRadius.circular(5.0),
),
),
onPressed: (){},
),
],
),
);
}
Widget _buildNameField(){
return Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Expanded(
child: TextFormField(
controller: mValue.firstController,
validator: (v) => mValue.validateFirstName(v),
obscureText: false,
decoration: InputDecoration(
hintText: 'First Name',
hintStyle: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.w500,
),
),
),
),
SizedBox(width: 10.0,),
Expanded(
child: TextFormField(
controller: mValue.lastController,
validator: (v) => mValue.validateLastName(v),
obscureText: false,
decoration: InputDecoration(
hintText: 'Last Name',
hintStyle: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.w500,
),
),
),
),
],
),
);
}
Widget _buildEmailField(){
return Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => TextFormField(
controller: mValue.emailController,
validator: (v) => mValue.validateEmail(v),
keyboardType: TextInputType.emailAddress,
decoration: InputDecoration(
hintText: 'Email address',
hintStyle: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.w500,
),
),
),
);
}
Widget _buildPasswordField(){
return Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => TextFormField(
validator: (v) => mValue.validatePassword(v),
controller: mValue.passwordController,
obscureText: mValue.showPassword,
decoration: InputDecoration(
hintText: 'Password',
hintStyle: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.w500,
),
suffix: InkWell(
onTap: mValue.togglePassword,
child: Text(mValue.showPassword ? "show" : "hide", style: TextStyle(color: Colors.black),),
),
),
),
);
}
Widget _buildPhonenumber(){
return Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => TextFormField(
validator: (v) => mValue.validatePhoneNumber(v),
controller: mValue.phoneController,
keyboardType: TextInputType.number,
decoration: InputDecoration(
hintText: 'Phone Number',
hintStyle: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.w500,
),
),
),
);
}
Widget _buildCircleAvatar(){
return Consumer<UserOnboardingModel>(
builder: (context, mValue, child) => InkWell(
onTap: (){
mValue.validateForm();
mValue.passRegister();
mValue.moveToLogin(context);
},
child: CircleAvatar(
radius: 28.93,
backgroundColor: Colors.black,
foregroundColor: Colors.white,
child: Icon(Icons.arrow_forward),
),
),
);
}
Text _buildFirstText(){
return Text('Already have an account?',
style: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0,
fontWeight: FontWeight.normal,
),);
}
Widget _buildLoginText(context){
return Consumer<UserOnboardingModel>(
builder: (context, value, child) => InkWell(
child: Row(
children: <Widget>[
Text('LOGIN',
style: TextStyle(
fontFamily: 'Lato',
fontSize: 14.0, fontWeight:
FontWeight.bold,),),
Icon(Icons.arrow_right)
],
),
onTap: (){
Navigator.pushNamed(context, LogIn.LOG_IN_ROUTE);
},
),
);
}

查看您的代码，您还没有创建controllers的实例，您只为它们声明了变量：

试试下面的代码：

class UserOnboardingModel extends ChangeNotifier with ValidationMixin{
TextEditingController firstController = TextEditingController(); // create your controllers 
TextEditingController lastController = TextEditingController();
TextEditingController passwordController = TextEditingController();
TextEditingController emailController = TextEditingController();
TextEditingController phoneController = TextEditingController();
bool showPassword = true;
final formKey = GlobalKey<FormState>();
Future<RegisterModel> _futureRegister;
Future<RegisterModel> createRegister()async{
final http.Response response = await http.post(
"apiKey",
body: jsonEncode(<String, String>{
'firstName' : validateFirstName(firstController.text), // access the controllers here
'lastName' : validateLastName(lastController.text),
'emailAddress' : validateEmail(emailController.text),
'phoneNumber' : validatePhoneNumber(phoneController.text),
'password' : validatePassword(passwordController.text)
})
);
if(response.statusCode == 201){
return RegisterModel.fromJson(json.decode(response.body));
}else{
throw Exception('Failed to create Register');
}
}
... // the rest of your code

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