how to store Strings from TextFormField to another page - flutter

Question

I have three text form fields on the sign-in page
There are two of them for username and password that work well, I have no problem with them
But the first one is for entering the domain (it is programmed so that each client has its own domain), which is my problem.
I want that when the user enters his domain, the URL of the program, which is in the IP page, is changed and the sign-in page is called only once, without the need to call other pages.
thsis is signIn page code:
I suggest that you pay attention to _signIn and ElevatedButton.
import 'package:flutter/material.dart';
import 'package:mis_project/api/my_api.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:mis_project/conts/myString.dart';
import '../auth/auth_page.dart';
import '../conts/colors.dart';
import '../conts/mSize.dart';
class SignIn extends StatefulWidget {
const SignIn({Key key}) : super(key: key);
#override
_SignInState createState() => _SignInState();
}
class _SignInState extends State<SignIn> {
String postDomain;
bool isLoading = false;
PageController _pageController;
List<TextEditingController> tecList;
#override
void initState() {
super.initState();
_pageController = PageController();
tecList = List.generate(3, (index) {
return TextEditingController();
});
WidgetsBinding.instance.addPostFrameCallback((_) {
_showModalBottomSheet(context);
});
}
_signIn() async {
print('Sign is is called');
var data = {
'email': tecList[1].text,
'password': tecList[2].text,
};
var jsonResponse = null;
SharedPreferences localStorage = await SharedPreferences.getInstance();
var response = await CallApi().postData(data, 'login');
jsonResponse = json.decode(response.body);
if (jsonResponse != null) {
setState(() {});
localStorage.setString('token', jsonResponse['token']);
Navigator.push(
context, MaterialPageRoute(builder: (context) => AuthPage()));
} else {
setState(() {});
}
}
final _formKey = GlobalKey<FormState>();
#override
void dispose() {
for (var tec in tecList) {
tec.dispose();
}
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
resizeToAvoidBottomInset: false,
backgroundColor: background_page,
body: isLoading
? Center(
child: CircularProgressIndicator(),
)
: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('assets/image/background.jpg'),
fit: BoxFit.cover),
),
),
);
}
void _showModalBottomSheet(BuildContext context) {
showModalBottomSheet<void>(
elevation: 30,
isScrollControlled: true,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topRight: Radius.circular(30),
),
),
context: context,
builder: (BuildContext context) {
return SizedBox(
height: mDeviceSize(context).height * 0.71,
width: mDeviceSize(context).width,
child: PageView.builder(
controller: _pageController,
itemCount: 3,
itemBuilder: (context, index) {
return Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Padding(
padding: const EdgeInsets.only(
top: 40, left: 25, right: 25, bottom: 15),
child: Form(
key: _formKey,
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
TextFormField(
textAlign: TextAlign.left,
textInputAction: TextInputAction.go,
style: TextStyle(color: Color(0xFF000000)),
cursorColor: view_all_color_HP,
controller: tecList[index],
keyboardType: TextInputType.text,
decoration: InputDecoration(
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(
color: view_all_color_HP,
),
),
contentPadding: EdgeInsets.symmetric(
vertical: 5.0, horizontal: 10),
labelText: signing_input_label[index],
labelStyle: TextStyle(color: view_all_color_HP),
floatingLabelBehavior: FloatingLabelBehavior.auto,
border: OutlineInputBorder(),
alignLabelWithHint: true,
hintStyle: TextStyle(
color: view_all_color_HP,
fontSize: 15,
fontWeight: FontWeight.normal),
),
autofocus: true,
validator: (value) {
if (value == null || value.isEmpty) {
return 'Please enter some text';
}
return null;
},
),
SizedBox(
height: 10,
),
ElevatedButton(
onPressed: () {
int nextPage = index + 1;
if (nextPage < 3) {
_pageController.animateToPage(nextPage,
duration: const Duration(milliseconds: 500),
curve: Curves.ease);
}
if (index == 0) {
postDomain = tecList[0].text;
print('domain post is : $postDomain');
print('domain value is: ${tecList[0].text}');
}
if (index == 1) {
print('email value is: ${tecList[1].text}');
}
if (index == 2) {
print('pass: ${tecList[2].text}');
_signIn();
}
},
child: Text(signing_button_label[index]),
style: ElevatedButton.styleFrom(
elevation: 0,
primary: view_all_color_HP,
fixedSize:
Size(mDeviceSize(context).width * 0.3, 5),
minimumSize: Size(0, 45),
),
),
SizedBox(
height: MediaQuery.of(context).viewInsets.bottom,
),
],
),
),
),
],
);
},
),
);
},
);
}
}
and this is my APi page
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:shared_preferences/shared_preferences.dart';
class CallApi{
final String _urlF = 'https://';
final String _urlE = '.lajwardsoftwares.com/api/v1/';
postData(data, apiUrl) async {
var fullUrl = _urlF + _urlE + apiUrl + await _getToken();
print('full url is: $fullUrl');
return await http.post(
Uri.parse(fullUrl),
body: jsonEncode(data),
headers: _setHeaders()
);
}
getData(apiUrl) async {
var fullUrl = _urlF + apiUrl + await _getToken();
return await http.get(
Uri.parse(fullUrl),
headers: _setHeaders()
);
}
_setHeaders() => {
'Content-type' : 'application/json',
'Accept' : 'application/json',
};
_getToken() async {
SharedPreferences localStorage = await SharedPreferences.getInstance();
var token = localStorage.getString('token');
return '?token=$token';
// print("saied: getToken ${localStorage.getString('token')}"),};
}
}
i want this .lajwardsoftwares.com to stored from TextFromField
thanks