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# Flutter ![Flutter logo][]
# [![Flutter logo][]][flutter.dev]
[![Gitter Channel][]][Gitter badge]
[![Build Status - Cirrus][]][Build status]
[![Gitter Channel][]][Gitter badge]
# Build beautiful native apps in record time
Flutter is Google’s mobile app SDK for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
Flutter is Google's mobile app SDK for crafting high-quality native interfaces
on iOS and Android in record time. Flutter works with existing code, is used by
developers and organizations around the world, and is free and open source.
### Documentation
## Documentation
**Main site: [flutter.dev][]**
* [Install](https://flutter.dev/get-started/install/)
* [Get started](https://flutter.dev/get-started/)
* [API documentation](https://docs.flutter.dev/)
* [Changelog](https://github.com/flutter/flutter/wiki/Changelog)
* [How to contribute](https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md)
* [Install Flutter](https://flutter.dev/get-started/)
* [Flutter documentation](https://flutter.dev/docs)
* [Development wiki](https://github.com/flutter/flutter/wiki)
* [Contributing to Flutter](https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md)
For announcements about new releases and breaking changes, follow the
[flutter-announce@googlegroups.com](https://groups.google.com/forum/#!forum/flutter-announce)
mailing list.
## Fast development
## About Flutter
Flutter's <em>hot reload</em> helps you quickly
and easily experiment, build UIs, add features, and fix
bugs. Experience sub-second reload times,
without losing state, on
emulators, simulators, and hardware for iOS
and Android.
We think Flutter will help you create beautiful, fast apps, with a productive,
extensible and open development model.
<img src="https://raw.githubusercontent.com/flutter/website/master/src/_assets/image/tools/android-studio/hot-reload.gif" alt="Make a change in your code, and your app changes instantly.">
### Beautiful apps
## Expressive and flexible UI
Quickly ship features with a focus on native end-user experiences.
Layered architecture allows full customization, which results in incredibly
fast rendering and expressive and flexible designs.
We want to enable designers to deliver their full creative vision without being
forced to water it down due to limitations of the underlying framework.
Flutter's [layered architecture] gives you control over every pixel on the
screen, and its powerful compositing capabilities let you overlay and animate
graphics, video, text and controls without limitation. Flutter includes a full
[set of widgets][widget catalog] that deliver pixel-perfect experiences on both
iOS and Android.
Delight your users with Flutter's built-in
beautiful Material Design and
Cupertino (iOS-flavor) widgets, rich motion APIs,
smooth natural scrolling, and platform awareness.
![Reflectly hero image][Reflectly hero image]
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-1.png" width="270" height="480" alt="Brand-first shopping design" align="left">](https://github.com/flutter/flutter/tree/master/examples/flutter_gallery/lib/demo/animation)
<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-2.png" width="270" height="480" alt="Fitness app design">
### Fast apps
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/screenshot-3.png" width="270" height="480" alt="Contact app design" align="left">](https://github.com/flutter/flutter/blob/master/examples/flutter_gallery/lib/demo/contacts_demo.dart)
[<img src="https://github.com/flutter/website/blob/master/src/images/homepage/ios-friendlychat.png" width="270" height="480" alt="iOS chat app design">](https://codelabs.developers.google.com/codelabs/flutter/)
Flutter is fast. It's powered by the same hardware-accelerated [Skia] 2D
graphics library that underpins Chrome and Android. We architected Flutter to
support glitch-free, jank-free graphics at the native speed of your device.
Flutter code is powered by the world-class [Dart platform], which enables
compilation to native 32-bit and 64-bit ARM code for iOS and Android.
Browse the <a href="https://flutter.dev/widgets/">widget catalog</a>.
### Productive development
## Modern, reactive framework
Easily compose your UI with Flutter's
modern functional-reactive framework and
rich set of platform, layout, and foundation widgets.
Solve your tough UI challenges with
powerful and flexible APIs for 2D, animation, gestures,
effects, and more.
```dart
class CounterState extends State<Counter> {
int counter = 0;
void increment() {
// Tells the Flutter framework that state has changed,
// so the framework can run build() and update the display.
setState(() {
counter++;
});
}
Widget build(BuildContext context) {
// This method is rerun every time setState is called.
// The Flutter framework has been optimized to make rerunning
// build methods fast, so that you can just rebuild anything that
// needs updating rather than having to individually change
// instances of widgets.
return Row(
children: <Widget>[
RaisedButton(
onPressed: increment,
child: Text('Increment'),
),
Text('Count: $counter'),
],
);
}
}
```
Flutter offers stateful hot reload, allowing you to make changes to your code
and see the results instantly without restarting your app or losing its state.
Browse the <a href="https://flutter.dev/widgets/">widget catalog</a>
and learn more about the
<a href="https://flutter.dev/widgets-intro/">functional-reactive framework</a>.
[![Hot reload animation][]][Hot reload]
## Access native features and SDKs
### Extensible and open model
Make your app come to life
with platform APIs, 3rd party SDKs,
and native code.
Flutter lets you reuse your existing Java/Kotlin and ObjC/Swift code,
and access native features and SDKs on Android and iOS.
Accessing platform features is easy. Here is a snippet from our <a href="https://github.com/flutter/flutter/tree/master/examples/platform_channel">interop example</a>:
Flutter works with any development tool, but includes editor plug-ins for both
[Visual Studio Code] and [IntelliJ / Android Studio]. Flutter provides
[thousands of packages][Flutter packages] to speed your development, regardless
of your target platform. And accessing platform features is easy. Here is a
snippet from our [interop example]:
```dart
Future<void> getBatteryLevel() async {
......@@ -118,35 +73,24 @@ Future<void> getBatteryLevel() async {
}
```
Learn how to use <a href="https://flutter.dev/using-packages/">packages</a> or
write <a href="https://flutter.dev/platform-channels/">platform channels</a>
to access native code, APIs, and SDKs.
## Unified app development
Flutter has the tools and libraries to help you easily
bring your ideas to life on iOS and Android.
If you don't have any mobile development experience, Flutter
is an easy and fast way to build beautiful mobile apps.
If you are an experienced iOS or Android developer,
you can use Flutter for your views and leverage much of your
existing Java/Kotlin/ObjC/Swift investment.
Learn more about what makes Flutter special in the
<a href="https://flutter.dev/technical-overview/">technical overview</a>.
# More resources
Join us in our [Gitter chat room](https://gitter.im/flutter/flutter) or join our public mailing list,
[flutter-dev@googlegroups.com](https://groups.google.com/forum/#!forum/flutter-dev).
# How to contribute
To join the team working on Flutter, see our [contributor guide](CONTRIBUTING.md).
Flutter is a fully open source project, and we welcome contributions.
Information on how to get started can be found at our
[contributor guide](CONTRIBUTING.md).
[Flutter logo]: https://flutter.dev/assets/flutter-lockup-4cb0ee072ab312e59784d9fbf4fb7ad42688a7fdaea1270ccf6bbf4f34b7e03f.svg
[flutter.dev]: https://flutter.dev
[Build Status - Cirrus]: https://api.cirrus-ci.com/github/flutter/flutter.svg
[Build status]: https://cirrus-ci.com/github/flutter/flutter/master
[flutter.dev]: https://flutter.dev
[Flutter logo]: https://github.com/dart-lang/site-shared/blob/master/src/_assets/image/flutter/icon/64.png?raw=1
[Gitter Channel]: https://badges.gitter.im/flutter/flutter.svg
[Gitter badge]: https://gitter.im/flutter/flutter?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
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[Gitter badge]: https://gitter.im/flutter/flutter?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
[layered architecture]: https://flutter.dev/docs/resources/inside-flutter
[widget catalog]: https://flutter.dev/widgets/
[Reflectly hero image]: https://github.com/flutter/website/blob/master/src/images/homepage/reflectly-hero-600px.png
[Skia]: https://skia.org/
[Dart platform]: https://www.dartlang.org/
[Hot reload animation]: https://raw.githubusercontent.com/flutter/website/master/src/_assets/image/tools/android-studio/hot-reload.gif
[Hot reload]: https://flutter.dev/docs/development/tools/hot-reload
[Visual Studio Code]: https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[IntelliJ / Android Studio]: https://plugins.jetbrains.com/plugin/9212-flutter
[Flutter packages]: https://pub.dartlang.org/flutter
[interop example]: https://github.com/flutter/flutter/tree/master/examples/platform_channel
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