How to Change Button Opacity in Flutter

There are scenario in Flutter when you will like to change button opacity.

The code example below illustrate how to change button opacity color in Flutter.

It is based on Flutter version 1.0.0.

Main.dart (App entry point)

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      //home: MyHomePage(title: 'Flutter Demo Home Page'),
      home: ButtonOpacity(),
    );
  }
}


button_opacity.dart

Create an instance of the class ButtonOpacityassign it to the MaterialAppwidget home attribute as show above.

import 'package:flutter/material.dart';

class ButtonOpacity extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Button Opacity Example'),
      ),
      body: Center(
        child: Opacity(
          //wrap our button in an `Opacity` Widget
          opacity: 0.5, //with 50% opacity
          child: RaisedButton(
            color: Colors.red,
            child: Text('Button Opacity'),
            onPressed: () {
              //Code to execute when Button is clicked
              //...
            },
          ),
        ),
      ),
    );
  }
}

flutter button opacity

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