Test Getx

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

void main() => runApp(GetMaterialApp(home: Home()));

class Home extends StatelessWidget {
  final c = Get.put(Controller());

  @override
  Widget build(context) {
    ever(c.count, (_) {
      Get.defaultDialog(title: 'Show Dialog', middleText: 'Dialog ke ${c.count}', textCancel: 'Tutup');
    });

    return Scaffold(
      body: Center(child: Obx(() => Text("Clicks: ${c.count}", style: TextStyle(fontSize: 24)))),
      floatingActionButton: FloatingActionButton(child: Icon(Icons.add), onPressed: c.increment),
    );
  }
}

class Controller extends GetxController {
  var count = 0.obs;

  void increment() => count++;
}