hello.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: ListView.builder(itemBuilder: (ctx, index) {
        return MyTile();
      }, itemCount: 200),
      ),
    );
  }
}


class MyTile extends StatefulWidget {
  @override
  _MyTileState createState() => _MyTileState();
}

class _MyTileState extends State<MyTile> {
  var _isExpanded = false;
  @override
  Widget build(BuildContext context) {
    return InkWell(
        onTap: () {
          setState(() {
            _isExpanded = !_isExpanded;
          });
        },
        child: AnimatedContainer(
          padding: EdgeInsets.symmetric(horizontal: 10, vertical: 5),
          height: _isExpanded ? 100 : 50,
          duration: Duration(milliseconds: 200),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Column(
                children: [Text('Hello'), Text('World')],
              ),
              Icon(Icons.navigate_next)
            ],
          ),
        ));
  }
}