Simplest Riverpod Example

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/all.dart';

final countProvider = StateProvider((ref) => 0); // declare providers anywhere
final clockProvider = StateProvider((ref) => DateTime.now());

void main() {
  runApp(ProviderScope(child: MyApp())); // add ProviderScope at top level
}

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        context.read(countProvider).state++; // get/update state by context.read
        context.read(clockProvider).state = DateTime.now();
      },
      child: Center(
        child: Consumer( // wrap with good old consumer
          builder: (context, watch, _) {
            final count = watch(countProvider).state; // receive update with watch
            final dateTime = watch(clockProvider).state;
            return RichText(
              text: TextSpan(text: "$dateTime\n$count"),
              textDirection: TextDirection.ltr,
            );
          },
        ),
      ),
    );
  }
}

This code and the other riverpod example need to be updated. The imports and function parameters have changed with the newest versions of riverpod.