验证器适用于除flutter中的字段外的所有字段

Question

我有一个添加客户详细信息的屏幕。姓名、公司、手机号码、电子邮件、个人资料图片。我已将验证器添加到所有字段中。Validator正在为所有字段工作，但不适用于一个字段，即顶部字段(Name(。我不知道为什么。当我把字段放在所有字段下面时，验证器就工作了，但我想把字段保持在上面。我希望"名称"字段包含一些值。

add_person.art

import 'dart:io';
import 'package:email_validator/email_validator.dart';
import 'package:vers2cts/models/customer_model.dart';
import 'package:vers2cts/models/language.dart';
import 'package:vers2cts/models/languages_widget.dart';
import 'package:vers2cts/models/languages_model.dart';
import 'package:vers2cts/screens/people_list.dart';
import 'package:vers2cts/services/db_service.dart';
import 'package:vers2cts/utils/form_helper.dart';
import 'search_contacts.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:image_picker/image_picker.dart';
class AddPerson extends StatefulWidget {
String uname;
final String appBarTitle;
final CustomerModel customer;
AddPerson(this.uname,this.customer,this.appBarTitle);
@override
State<StatefulWidget> createState() {
return AddPersonState(uname,customer,appBarTitle);
}
}

class AddPersonState extends State<AddPerson> {
GlobalKey<FormState> globalFormKey = GlobalKey<FormState>();
String uname,email,mobnum;
AddPersonState(this.uname,this.customer,this.appBarTitle);

bool engcheckbox=false;
String appBarTitle;
CustomerModel customer=new CustomerModel();
LanguagesModel langs=new LanguagesModel();
DBService dbService=new DBService();
bool showPassword = false;
DateTime _date=DateTime.now();
TextEditingController datefield=TextEditingController();
PickedFile _imageFile;
final ImagePicker _picker=ImagePicker();
TextEditingController custfNameController = TextEditingController();
TextEditingController custlNameController = TextEditingController();
TextEditingController custMobileNoController = TextEditingController();
TextEditingController custCompanyController = TextEditingController();
TextEditingController addrController = TextEditingController();
TextEditingController custEmailController = TextEditingController();

void getImage(ImageSource source) async{
final pickedFile=await _picker.getImage(
source:source);
setState(() {
_imageFile=pickedFile;
customer.cust_photo = _imageFile.path;
});
}
Future<Null> _selectDate(BuildContext context)async {
DateTime _datePicker = await showDatePicker(
context: context,
initialDate: _date,
firstDate: DateTime(1947),
lastDate: DateTime(2030),);
if (_datePicker != null && _datePicker != _date) {
setState(() {
_date = _datePicker;
String formattedDate = DateFormat('dd-MM-yyyy').format(_date);
datefield.text=formattedDate.toString();
print(datefield.text);

});
}
}

@override
Widget build(BuildContext context){
var selectedLanguages = languages.where((element) => element.selected);
TextStyle textStyle=Theme.of(context).textTheme.title;
var height = MediaQuery.of(context).size.height;
var width = MediaQuery.of(context).size.width;
var _minimumPadding = 5.0;
custfNameController.text = customer.first_name;
custlNameController.text = customer.last_name;
custMobileNoController.text = customer.mob_num;
custCompanyController.text=customer.org_name;
addrController.text=customer.addr;
custEmailController.text=customer.email_id;
return WillPopScope(
onWillPop: () {
moveToLastScreen();
},
child: Scaffold(
appBar: AppBar(
title: Text(appBarTitle),

elevation: 1,
actions: [
IconButton(
icon: Icon(
Icons.search,
),
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (BuildContext context) => SearchContacts()));
},
),
],
),
body:Form(
key: globalFormKey,
child: Container(
padding: EdgeInsets.only(left: 16, top: 25, right: 16),
child:
GestureDetector(
onTap: () {
FocusScope.of(context).unfocus();
},
child: ListView(
children: [
ImageProfile(customer.cust_photo),
SizedBox(
height: 35,
),

buildTextField("Name",custfNameController,
(value) => updatefName(value),(value)=>checkfname(value)),
buildTextField("Mobile",custMobileNoController,
(value) => updateMobile(value),(value)=>checkmobile(value)),
buildTextField("Company",custCompanyController,
(value) => updateCompany(value),(value)=>checkempty(value)),
buildTextField("Email",custEmailController,
(value) => updateEmail(value),(value)=>checkmail(value)),
Text("Address"),
Padding(
padding: const EdgeInsets.all(8.0),
child: TextField(
controller: addrController,
decoration: InputDecoration(
border: OutlineInputBorder(
borderSide: const BorderSide(width: 2.0),)),
keyboardType: TextInputType.multiline,
minLines: 5,//Normal textInputField will be displayed
maxLines: 5, // when user presses enter it will adapt to it
onChanged: (value) {
this.customer.addr = value;
},
),
),
SizedBox(
height: height * 0.02,
),

Divider(),
SizedBox(
height: height * 0.02,
),
Row(
children: <Widget>[
Expanded(
child: Text("Show on Call",
style: textStyle,

)
),
SizedBox(
height: height * 0.02,
),
SizedBox(
height: 35,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
OutlineButton(
padding: EdgeInsets.symmetric(horizontal: 50),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
onPressed: () {},
child: Text("CANCEL",
style: TextStyle(
fontSize: 14,
letterSpacing: 2.2,
color: Colors.black)),
),
RaisedButton(
onPressed: () {
setState(() {
_saveCustomer();
});

},
//color: Colors.purpleAccent,
color: Theme.of(context).primaryColor,
padding: EdgeInsets.symmetric(horizontal: 50),
elevation: 2,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
child: Text(
"SAVE",
style: TextStyle(
fontSize: 14,
letterSpacing: 2.2,
color: Colors.white),
),
)
],
)
],
),
),
),
)));
}
Widget bottomSheet(){
return Container(
height: 100,
width: MediaQuery.of(context).size.width ,
margin: EdgeInsets.symmetric(
horizontal:20,
vertical:20,
),
child: Column(
children: <Widget>[
Text("Choose profile photo",
style: TextStyle(fontSize: 20.0),),
SizedBox(
height: 20,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FlatButton.icon(
onPressed: (){
getImage(ImageSource.camera);
},
icon:Icon(Icons.camera,color: Theme.of(context).primaryColor,), label:Text("camera")),
FlatButton.icon(
onPressed: (){
getImage(ImageSource.gallery);
},
icon:Icon(Icons.photo_library), label:Text("Gallery"))
],
)
],
),
);
}
//This is for 1st 3 Textfields name,mobile,company
Widget buildTextField(String labelText,tController,Function onChanged,Function validator) {
return Padding(
padding: const EdgeInsets.only(bottom: 35.0),
child: TextFormField(
controller:tController,
style: TextStyle(
fontSize: 20,
fontWeight: FontWeight.bold,
color: Colors.black,
),
decoration: InputDecoration(
contentPadding: EdgeInsets.only(bottom: 3),
labelText: labelText,
labelStyle:TextStyle(),
floatingLabelBehavior: FloatingLabelBehavior.always,
),
onChanged: (String value) {
return onChanged(value);
},
validator:(String value) {
return validator(value);
},
),
);
}
void moveToLastScreen() {
Navigator.pop(context, true);
}
bool validateAndSave() {
final form = globalFormKey.currentState;
if (form.validate()) {
form.save();
return true;
}
return false;
}
void _saveCustomer() async {
if (validateAndSave()) {
var result;
var res;
var mob = await dbService.checkcustMobno(mobnum,uname);
var mail = await dbService.checkcustEmail(email,uname);
if (mob != null) {
FormHelper.showAlertDialog(
context, 'Error',
'Customer with this mobile number already exists');
}
else if (mail != null) {
FormHelper.showAlertDialog(
context, 'Error',
'Customer with this email id already exists');
}else {
if (customer.cust_id != null) { // Case 1: Update operation
result = await dbService.updateCustomer(customer);
} else { // Case 2: Insert Operation
result = await dbService.insertCustomer(customer);
}
if (result != 0) { // Success
moveToLastScreen();
FormHelper.showAlertDialog(
context, 'Status', 'Customer Saved Successfully');
} else { // Failure
FormHelper.showAlertDialog(
context, 'Status', 'Problem Saving Customer');
}
languages.forEach((lang) async {
print("${lang.name} : ${lang.selected}");
if (lang.selected) {
LanguagesModel language = LanguagesModel(lang: lang.name);
print("customer id from lang");
print(customer.cust_id);
await dbService.insertLanguages(language);
}
});
}
}
}
String updatefName(String value) {
customer.first_name = custfNameController.text;
customer.cre_by=uname;
print(uname);
}
String updatelName(String value) {
if(value.isEmpty)
customer.last_name = " ";
else
customer.last_name = custlNameController.text;
}
String updateMobile(value) {
customer.mob_num = custMobileNoController.text;
mobnum=value;
}
String updateEmail(value) {
customer.email_id = custEmailController.text;
email=value;
}
String updateCompany(String value) {
customer.org_name = custCompanyController.text;
}
String checkfname(String value){
if(value.isEmpty)
{
return "First name can't be null";
}
return null;
}
String checkempty(String value){
print("checkempty called");
if(value.isEmpty)
{
return "Can't be null";
}
return null;
}
String checkmobile(String value) {
print("checkmobile called");
if(value.isEmpty)
{
return 'Please enter phone no.';
}
if(value.length<6)
{
return 'Please enter a valid phone no.';
}
return null;
}
String checkmail(String value){
print("checkmail called");
if(value.isEmpty)
{
return 'Please Enter E-mail address';
}
if (!EmailValidator.validate(value)) {
return 'Please enter a valid Email';
}
return null;
}
}

Answer 1

用Column替换ListView(buildTextField是其子代(，并用SingleChildScrollView包装Column。