Expansion Tile demo

main.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: Center(
          child: MyExpansionTile(),
        ),
      ),
    );
  }
}

class MyExpansionTile extends StatelessWidget {
  
  // defining the title and descriptions.
  final List<String> titles = ['title-1', 'title-2', 'title-3'];
  final List<String> descriptions = [
    'Description for title-1',
    'Description for title-2',
    'Detailed Description for  title-3'
  ];

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      shrinkWrap: true,
      itemBuilder: (context, index) {
        
        // handle index out of range.
        if(index >= titles.length)
          return null;
        
        // build and expansion tile for each title and description.
        return ExpansionTile(          
          // comment following to show an arrow in the end of each expansion tile as per material design.
          trailing: Container(width: 0, height:0),          
          
          leading: Icon(Icons.open_in_browser),          
          title: Text(titles[index]),
          children: <Widget>[
             Text(descriptions[index]),
          ],
        );
      },
    );
  }
}