main.dart

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

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

class MyApp extends StatelessWidget {
  final Random random = new Random();
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.green,
      ),
      home: Scaffold(
          appBar: AppBar(title: Text('WhatsApp'), actions: [
            IconButton(icon: Icon(Icons.search), onPressed: () {}),
            IconButton(icon: Icon(Icons.more_vert), onPressed: () {}),
          ]),
          floatingActionButton:
              FloatingActionButton(child: Icon(Icons.message), onPressed: () {}),
          body: ListView.builder(
              itemBuilder: (context, index) {
                int randomNumber = random.nextInt(1000);
                return ListTile(
                    title: Text("Contact $index"),
                    trailing: Column(children: [Text("13:00 pm")]),
                    leading: ClipRRect(
                      borderRadius: BorderRadius.circular(32.0),
                      child: Image.network(
                        "https://picsum.photos/$randomNumber",
                        height: 32,
                        width: 32,
                      ),
                    ));
              },
              itemCount: 20)),
    );
  }
}