GetX - Sample StateManager without GetMaterialApp

main.dart

import 'package:flutter/material.dart';
import 'package:get/get.dart';

void main() {
  runApp(MaterialApp(home: HomePage()));
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('HOME')),
      body: Center(
        child: RaisedButton(
          child: Text('Go to page 2'),
          onPressed: () => Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => Page2()),
          ),
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Page2')),
      body: Container(
        child: GetX<Page2Controller>(
          init: Page2Controller(),
          builder: (_) {
            return Center(
              child: Text('${_.name.value}/${_.anotherController.name.value}'),
            );
          },
        ),
      ),
    );
  }
}

class Page2Controller extends GetxController {
  final name = 'Page2'.obs;

  final anotherController = Get.put(AnotherController());

  @override
  void onInit() {
    print('onInit');
    super.onInit();
  }

  @override
  void onReady() {
    print('onReady');
    super.onReady();
  }

  @override
  void onClose() {
    Get.delete<AnotherController>();
    print('onClose');
    super.onClose();
  }
}

class AnotherController extends GetxController {
  final name = 'Another'.obs;
}