main.dart

main.dart

import "package:flutter/material.dart";

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int count = 0;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(brightness: Brightness.dark),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: Text('Apanu App'),
          actions: <Widget>[
            Center(
              child: Text(count.toString()),
            ),
            IconButton(
              onPressed: () {
                setState(() {
                  count++;
                });
              },
              icon: Icon(Icons.arrow_upward),
            ),
            IconButton(
              onPressed: () {
                setState(() {
                  count--;
                });
              },
              icon: Icon(Icons.arrow_downward),
            ),
            IconButton(
              onPressed: () {
                setState(() {
                  count = 0; // reset
                });
              },
              icon: Icon(Icons.refresh),
            ),
          ],
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: <Widget>[
              Text('Press Up Arrow To Increment'),
              Text('Press Down Arrow To Decrement'),
              Text('Press Reset To Reset'),
            ],
          ),
        ),
      ),
    );
  }
}