Easy Dynamic Theme

This is a new and easy approach on Flutter Themes.

Automatically get your OS defined Theme (Dynamic), force your prefered one (Light / Dark) and persist your choice in the device.

Easy peasy, don't you think? ;)

Demo

Getting Started

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Minimum Requirements

• Dart SDK: >=2.12.0 <3.0.0
• Flutter: >= 1.20.0

Installation and Usage

Once you're familiar with Flutter you may install this package adding easy_dynamic_theme to the dependencies list
of the pubspec.yaml file as follow:

dependencies:  
  flutter: 
    sdk: flutter  
 easy_dynamic_theme: ^2.2.0

Then run the command flutter packages get on the console.

Examples of use

All magic occurs in your main.dart file

import 'package:flutter/material.dart';
import 'package:easy_dynamic_theme/easy_dynamic_theme.dart';
import 'home.dart';

void main() async { 
  runApp( 
    EasyDynamicThemeWidget( 
      child: MyApp(), 
    ), 
  );
}  
  
class MyApp extends StatelessWidget {  
  final String title = 'EDT - Example'; 
   
  @override 
  Widget build(BuildContext context) { 
    return MaterialApp( 
      title: title, 
      theme: ThemeData.light(), 
      darkTheme: ThemeData.dark(), 
      themeMode: EasyDynamicTheme.of(context).themeMode, 
      home: new MyHomePage(title: title,) 
    ); 
  }
}  

How to use predefined Themes

You can use your own themes as follows:

In the file themes.dart define your Themes

  import 'package:flutter/material.dart';
  
  var lightThemeData = new ThemeData(
      primaryColor: Colors.blue,
      textTheme: new TextTheme(button: TextStyle(color: Colors.white70)),
      brightness: Brightness.light,
      accentColor: Colors.blue);
  
  var darkThemeData = ThemeData(
      primaryColor: Colors.blue,
      textTheme: new TextTheme(button: TextStyle(color: Colors.black54)),
      brightness: Brightness.dark,
      accentColor: Colors.blue);

And then in your main.dart file import your themes file and use them on MaterialApp attributes theme and darkTheme

import 'package:flutter/material.dart';
import 'package:easy_dynamic_theme/easy_dynamic_theme.dart';
import 'theme.dart';
import 'home.dart';

void main() async { 
  runApp( 
    EasyDynamicThemeWidget( 
      child: MyApp(), 
    ), 
  );
}  
  
class MyApp extends StatelessWidget {  
  final String title = 'EDT - Example'; 
   
  @override
  Widget build(BuildContext context) { 
    return MaterialApp( 
      title: title, 
      theme: lightThemeData, 
      darkTheme: darkThemeData, 
      themeMode: EasyDynamicTheme.of(context).themeMode, 
      home: new MyHomePage(title: title,) 
    ); 
  }
}  

How to change the ThemeMode in your app

You can use the function changeTheme from anywhere in your app.

This function have two optional parameters: dynamic and dark. If the value of dynamic is true, it takes precedence over dark.

  EasyDynamicTheme.of(context).changeTheme();

How to get your app current theme

Current app ThemeMode

ThemeMode themeMode = EasyDynamicTheme.of(context).themeMode;  

The above example will return a value of the enum used by MaterialApp's ThemeMode with one of the following values:

system - Use either the light or dark theme based on what the user has selected in the system settings.

light - Always use the light mode regardless of system preference.

dark - Always use the dark mode (if available) regardless of system preference.

Current Context brightness

Brightness brightness = Theme.of(context).brightness;  

Or if you want to know if your widget is dark mode based, you can achieve it with:

bool isDarkModeOn = Theme.of(context).brightness == Brightness.dark;  

What about some out-of-the-box widgets?

Right now we have

• EasyDynamicThemeBtn, which is (kind of) a FlatButton that displays the icon according to the current theme of your app and allows you to switch between them.
• EasyDynamicThemeSwitch, which is a Switch widget, based on the current theme's brightness of your context and allows you to switch between light/dark them.
• EasyDynamicThemeAutoSwitch, which is a Switch widget, based on the current theme of your app and allows you to prioritize (or not) your OS defined brightness.