meincantor-app/lib/Settings/Pages/user_settings.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:MeinCantor/networking.dart';
import 'package:shared_preferences/shared_preferences.dart';

Future<String> getSettingsString(String key) async {
  SharedPreferences prefs = await SharedPreferences.getInstance();
  String? value = prefs.getString(key);
  if (value == null || value.isEmpty) {
    value = "";
  }
  return value;
}

class UserSettings extends StatelessWidget {
  const UserSettings({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {

    //TextEditingController nameController = TextEditingController(text: "Denys Konovalov");
    return Scaffold(
        appBar: AppBar(
          title: const Text("Benutzereinstellungen"),
          centerTitle: true,
        ),
        body: ListView(
          padding: const EdgeInsets.fromLTRB(5, 5, 5, 5),
          children: [
            Padding(
                padding: const EdgeInsets.fromLTRB(10, 10, 10, 10),
                child: Container(
                    width: 128.0,
                    height: 128.0,
                    decoration: const BoxDecoration(
                        shape: BoxShape.circle,
                        image: DecorationImage(
                            fit: BoxFit.scaleDown,
                            image: AssetImage("assets/images/meincantor_r.png")
                        )
                    )
                ),
            ),
            FutureBuilder(
              future: getSettingsString("name"),
              builder: (context, snapshot) {
                if (snapshot.hasData) {
                  return TextField(
                    decoration: const InputDecoration(
                      border: OutlineInputBorder(),
                      labelText: 'Name',
                    ),
                    readOnly: true,
                    controller: TextEditingController(text: snapshot.data as String),
                  );
                } else {
                  return (const Center(child: CircularProgressIndicator()));
                }
              }
            ),
            Padding(
                padding: const EdgeInsets.fromLTRB(5, 20, 5, 5),
                child: buildClassesChooser()
            ),
          ],
        ));
  }
}