Add Material touch ripples

Widgets that follow the Material Design guidelines display a ripple animation when tapped.

Flutter provides the InkWell widget to perform this effect. Create a ripple effect using the following steps:

1. Create a widget that supports tap.
2. Wrap it in an InkWell widget to manage tap callbacks and ripple animations.

// The InkWell wraps the custom flat button widget.
InkWell(
  // When the user taps the button, show a snackbar.
  onTap: () {
    ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
      content: Text('Tap'),
    ));
  },
  child: const Padding(
    padding: EdgeInsets.all(12.0),
    child: Text('Flat Button'),
  ),
)

Interactive example

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    const title = 'InkWell Demo';

    return const MaterialApp(
      title: title,
      home: MyHomePage(title: title),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final String title;

  const MyHomePage({Key? key, required this.title}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: const Center(
        child: MyButton(),
      ),
    );
  }
}

class MyButton extends StatelessWidget {
  const MyButton({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    // The InkWell wraps the custom flat button widget.
    return InkWell(
      // When the user taps the button, show a snackbar.
      onTap: () {
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
          content: Text('Tap'),
        ));
      },
      child: const Padding(
        padding: EdgeInsets.all(12.0),
        child: Text('Flat Button'),
      ),
    );
  }
}