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65 lines
2.1 KiB
Markdown
65 lines
2.1 KiB
Markdown
**Welcome to the Flutter API reference documentation!**
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Flutter is Google's SDK for crafting beautiful, fast user experiences for
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mobile, web, and desktop from a single codebase. Flutter works with existing
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code, is used by developers and organizations around the world, and is free
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and open source.
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This API reference covers all libraries that are exported by the Flutter
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SDK.
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### More Documentation
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This site hosts Flutter's API documentation. Other documentation can be found at
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the following locations:
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* [flutter.dev](https://flutter.dev) (main site)
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* [Installation](https://flutter.dev/docs/get-started/install)
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* [Codelabs](https://flutter.dev/docs/codelabs)
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* [Contributing to Flutter](https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md)
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### Importing a Library
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#### Framework Libraries
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Libraries in the "Libraries" section below (or in the left navigation) are part
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of the core Flutter framework and are imported using
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`'package:flutter/<library>.dart'`, like so:
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```dart
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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```
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#### Dart Libraries
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Libraries in the "Dart" section exist in the `dart:` namespace and are imported
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using `'dart:<library>'`, like so:
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```dart
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import 'dart:async';
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import 'dart:ui';
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```
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Except for `'dart:core'`, you must import a Dart library before you can use it.
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#### Supporting Libraries
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Libraries in other sections are supporting libraries that ship with Flutter.
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They are organized by package and are imported using
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`'package:<package>/<library>.dart'`, like so:
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```dart
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import 'package:flutter_test/flutter_test.dart';
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import 'package:file/local.dart';
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```
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### Packages on pub.dev
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Flutter has a rich ecosystem of packages that have been contributed by the
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Flutter team and the broader open source community to a central repository.
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Among the thousands of packages, you'll find support for Firebase, Google
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Fonts, hardware services like Bluetooth and camera, new widgets and
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animations, and integration with other popular web services. You can browse
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those packages at [pub.dev](https://pub.dev).
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