├── README.md
├── lib
    └── main.dart
├── pubspec.yaml
└── switchtheme.iml


/README.md:
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 1 | # switchtheme
 2 | 
 3 | A new Flutter project.
 4 | 
 5 | ## Getting Started
 6 | 
 7 | This project is a starting point for a Flutter application.
 8 | 
 9 | A few resources to get you started if this is your first Flutter project:
10 | 
11 | - [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
12 | - [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
13 | 
14 | For help getting started with Flutter, view our
15 | [online documentation](https://flutter.dev/docs), which offers tutorials,
16 | samples, guidance on mobile development, and a full API reference.
17 | 


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/lib/main.dart:
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 1 | import 'package:flutter/material.dart';
 2 | 
 3 | void main() {
 4 |   runApp(MyApp());
 5 | }
 6 | 
 7 | var theme = darkTheme;
 8 | 
 9 | var darkTheme = ThemeData(
10 |   primarySwatch: Colors.red,
11 |   brightness: Brightness.dark,
12 |   visualDensity: VisualDensity.adaptivePlatformDensity,
13 | );
14 | 
15 | var lightTheme = ThemeData(
16 |   primarySwatch: Colors.green,
17 |   brightness: Brightness.light,
18 |   visualDensity: VisualDensity.adaptivePlatformDensity,
19 | );
20 | 
21 | class MyApp extends StatefulWidget {
22 |   @override
23 |   _MyAppState createState() => _MyAppState();
24 | }
25 | 
26 | class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
27 |   @override
28 |   void initState() {
29 |     super.initState();
30 |     WidgetsBinding.instance.addObserver(this);
31 |     changeTheme();
32 |   }
33 | 
34 |   @override
35 |   void dispose() {
36 |     WidgetsBinding.instance.removeObserver(this);
37 |     super.dispose();
38 |   }
39 | 
40 |   @override
41 |   void didChangePlatformBrightness() {
42 |     changeTheme();
43 |   }
44 | 
45 |   changeTheme() {
46 |     var brightness = WidgetsBinding.instance.window.platformBrightness;
47 |     brightness == Brightness.dark ? theme = darkTheme : theme = lightTheme;
48 | 
49 |     setState(() {});
50 |   }
51 | 
52 |   @override
53 |   Widget build(BuildContext context) {
54 |     return MaterialApp(
55 |       title: 'Flutter Themes',
56 |       debugShowCheckedModeBanner: false,
57 |       theme: theme,
58 |       home: HomePage(),
59 |     );
60 |   }
61 | }
62 | 
63 | class HomePage extends StatelessWidget {
64 |   @override
65 |   Widget build(BuildContext context) {
66 |     return Scaffold(
67 |       appBar: AppBar(
68 |         title: Text("Flutter Themes"),
69 |       ),
70 |       body: Center(
71 |         child: Text("Hello World"),
72 |       ),
73 |     );
74 |   }
75 | }
76 | 


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/pubspec.yaml:
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 1 | name: switchtheme
 2 | description: A new Flutter project.
 3 | 
 4 | # The following line prevents the package from being accidentally published to
 5 | # pub.dev using `pub publish`. This is preferred for private packages.
 6 | publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 7 | 
 8 | # The following defines the version and build number for your application.
 9 | # A version number is three numbers separated by dots, like 1.2.43
10 | # followed by an optional build number separated by a +.
11 | # Both the version and the builder number may be overridden in flutter
12 | # build by specifying --build-name and --build-number, respectively.
13 | # In Android, build-name is used as versionName while build-number used as versionCode.
14 | # Read more about Android versioning at https://developer.android.com/studio/publish/versioning
15 | # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
16 | # Read more about iOS versioning at
17 | # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
18 | version: 1.0.0+1
19 | 
20 | environment:
21 |   sdk: ">=2.7.0 <3.0.0"
22 | 
23 | dependencies:
24 |   flutter:
25 |     sdk: flutter
26 | 
27 | 
28 |   # The following adds the Cupertino Icons font to your application.
29 |   # Use with the CupertinoIcons class for iOS style icons.
30 |   cupertino_icons: ^0.1.3
31 | 
32 | dev_dependencies:
33 |   flutter_test:
34 |     sdk: flutter
35 | 
36 | # For information on the generic Dart part of this file, see the
37 | # following page: https://dart.dev/tools/pub/pubspec
38 | 
39 | # The following section is specific to Flutter.
40 | flutter:
41 | 
42 |   # The following line ensures that the Material Icons font is
43 |   # included with your application, so that you can use the icons in
44 |   # the material Icons class.
45 |   uses-material-design: true
46 | 
47 |   # To add assets to your application, add an assets section, like this:
48 |   # assets:
49 |   #   - images/a_dot_burr.jpeg
50 |   #   - images/a_dot_ham.jpeg
51 | 
52 |   # An image asset can refer to one or more resolution-specific "variants", see
53 |   # https://flutter.dev/assets-and-images/#resolution-aware.
54 | 
55 |   # For details regarding adding assets from package dependencies, see
56 |   # https://flutter.dev/assets-and-images/#from-packages
57 | 
58 |   # To add custom fonts to your application, add a fonts section here,
59 |   # in this "flutter" section. Each entry in this list should have a
60 |   # "family" key with the font family name, and a "fonts" key with a
61 |   # list giving the asset and other descriptors for the font. For
62 |   # example:
63 |   # fonts:
64 |   #   - family: Schyler
65 |   #     fonts:
66 |   #       - asset: fonts/Schyler-Regular.ttf
67 |   #       - asset: fonts/Schyler-Italic.ttf
68 |   #         style: italic
69 |   #   - family: Trajan Pro
70 |   #     fonts:
71 |   #       - asset: fonts/TrajanPro.ttf
72 |   #       - asset: fonts/TrajanPro_Bold.ttf
73 |   #         weight: 700
74 |   #
75 |   # For details regarding fonts from package dependencies,
76 |   # see https://flutter.dev/custom-fonts/#from-packages
77 | 


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/switchtheme.iml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <module type="JAVA_MODULE" version="4">
 3 |   <component name="NewModuleRootManager" inherit-compiler-output="true">
 4 |     <exclude-output />
 5 |     <content url="file://$MODULE_DIR$">
 6 |       <sourceFolder url="file://$MODULE_DIR$/lib" isTestSource="false" />
 7 |       <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
 8 |       <excludeFolder url="file://$MODULE_DIR$/.dart_tool" />
 9 |       <excludeFolder url="file://$MODULE_DIR$/.idea" />
10 |       <excludeFolder url="file://$MODULE_DIR$/.pub" />
11 |       <excludeFolder url="file://$MODULE_DIR$/build" />
12 |     </content>
13 |     <orderEntry type="sourceFolder" forTests="false" />
14 |     <orderEntry type="library" name="Dart SDK" level="project" />
15 |     <orderEntry type="library" name="Flutter Plugins" level="project" />
16 |     <orderEntry type="library" name="Dart Packages" level="project" />
17 |   </component>
18 | </module>


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