How to edit text field and save in controller?

I have edit form where some data in text fields controller from database but when I edit or change the test of any text field it doesn't change the value of text field give it me same value which comes from database i can't change the textfiled value.

Here is my code:-

class Edit extends StatefulWidget {

Edit({Key? key}) : super(key: key);

@override
_Edit createState() => _Edit();
}


class _Edit extends State<Edit>{

 var UsrID = Auth.prefs?.getString('usrid');

 var data;

 RangeValues? _currentRangeValues;

@override
 void initState() {
 super.initState();
 getData();
}

getData() async{
 var res = await http.get(Uri.https('www.*******.com', 
 '/index.php',{'act':'profile','UsrID': '${UsrID}'}));
 data = jsonDecode(res.body);
 print(data);
 setState(() {});
 print(res.body);
}

TextEditingController _name = TextEditingController();
TextEditingController _email = TextEditingController();
TextEditingController _phone = TextEditingController();

var name = "";
var email = "";
var phone = "";
var user = "";

@override
 Widget build(BuildContext context){


return Scaffold(
Container(
      child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
      Padding(
      padding: EdgeInsets.fromLTRB(10, 0, 0, 0),
       child: Text("Name",
           style: TextStyle(color: Colors.black,),
               ),
       ),
       addVerticalSpace(10),
       TextField(
         controller: _name..text = '${data[0]['name']}',
         keyboardType: TextInputType.text,
         obscureText: false,
         decoration: InputDecoration(
         hintText: 'Zeo Saldana',
           ),
          )
          ],
          ),
          ),
         addVerticalSpace(20),
         Container(
            child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
              children: [
              Padding(
              padding: EdgeInsets.fromLTRB(10, 0, 0, 0),
              child: Text("Email",
                     style: TextStyle(color: Colors.black,),
                     ),
              ),
              addVerticalSpace(10),
              TextField(
              controller: _email..text = '${data[0]['email']}',
              keyboardType: TextInputType.text,
              obscureText: false,
              decoration: InputDecoration(
               hintText: 'jakson@gmail.com',
              ),
              )],
              ),),
              addVerticalSpace(20),
              Container(
              child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
               children: [
               Padding(padding: EdgeInsets.fromLTRB(10, 0, 0, 0),
               child: Text("Phone Number",
                      style: TextStyle(color: Colors.black,),
                      ),
                     ),
               addVerticalSpace(10),
               TextField(
               controller: _phone..text = '${data[0]['mobile']}',
               keyboardType: TextInputType.text,
               obscureText: false,
               decoration: InputDecoration(
                hintText: '+1 94526 12547',
              
                   ),
                )
               ],),
               )
         addVerticalSpace(30),
              ElevatedButton(
                      child: const Text(
                                  'SAVE',
                                  style: TextStyle(
                                    fontSize: 18,
                                  ),
                                ),
                      onPressed: () async{
                         name = _name.text;
                         email = _email.text;
                         phone = _phone.text;
                         user = '${UsrID}';

                          final body = null;
                          final url = Uri.https('www.*******.net', '/index.php',{'act':'profileupdate','name': name, 'email': email, 'phone': phone, 'user': user});
                           final response = await http.post(
                               url,
                               headers: {'Content-Type': 'application/json'},
                               body: body
                               );
                            print(url);
                                 int statusCode = response.statusCode;
                                  //var responseBody = json.decode(response.body);

                                  Map<String, dynamic> responseBody = jsonDecode(response.body);
                                  setState(() {});

                                  var list = responseBody['error'];
                                  var stringList = list.join("\n");
                                  print(stringList); //Prints "in new line"
                                 

                                  var statusRes = responseBody['status'];
                                  var UserID = responseBody['usrid'];

                                  if(statusRes == 'success'){
                                    print('success: '+statusRes);
                                    print(UserID);
                                  } else {
                                    print('error: '+statusRes);
                                  }

                                  print(responseBody);
                                  //print(allerror);


                                  setState(() {});

                                },
                              )
      }

when I change the value of any field it doesn't save and when printing the post API so it shows the old data any data can't change and save.
Please help how I edit all field controller data and post it to API to save in the database.

Issue comes from here

  controller: _name..text = '${data[0]['name']}',

It forces the controller to have the same value. You can use TextEditingController.fromValue to assign for the 1st time.

late TextEditingController _name = TextEditingController.fromValue(TextEditingValue(text: data[0]['name']));

Repeat the same for others fields. More about TextEditingController