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Flutter_Documentation

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Flutter plugins
<topic_end>
<topic_start>
How do I access the GPS sensor?
Use the geolocator community plugin.<topic_end>
<topic_start>
How do I access the camera?
The image_picker plugin is popular
for accessing the camera.<topic_end>
<topic_start>
How do I log in with Facebook?
To Log in with Facebook, use the
flutter_facebook_login community plugin.<topic_end>
<topic_start>
How do I use Firebase features?
Most Firebase functions are covered by
first party plugins.
These plugins are first-party integrations,
maintained by the Flutter team:You can also find some third-party Firebase plugins on
pub.dev that cover areas not directly covered by the
first-party plugins.<topic_end>
<topic_start>
How do I build my own custom native integrations?
If there is platform-specific functionality that Flutter
or its community Plugins are missing,
you can build your own following the
developing packages and plugins page.Flutter’s plugin architecture, in a nutshell, is much like using an Event bus in
Android: you fire off a message and let the receiver process and emit a result
back to you. In this case, the receiver is code running on the native side
on Android or iOS.<topic_end>
<topic_start>
How do I use the NDK in my Flutter application?
If you use the NDK in your current Android application and want your Flutter
application to take advantage of your native libraries then it’s possible by
building a custom plugin.Your custom plugin first talks to your Android app, where you call your
native functions over JNI. Once a response is ready,
send a message back to Flutter and render the result.Calling native code directly from Flutter is currently not supported.<topic_end>
<topic_start>
Themes
<topic_end>
<topic_start>
How do I theme my app?
Out of the box, Flutter comes with a beautiful implementation of Material
Design, which takes care of a lot of styling and theming needs that you would
typically do. Unlike Android where you declare themes in XML and then assign it
to your application using AndroidManifest.xml, in Flutter you declare themes
in the top level widget.To take full advantage of Material Components in your app, you can declare a top
level widget MaterialApp as the entry point to your application. MaterialApp
is a convenience widget that wraps a number of widgets that are commonly
required for applications implementing Material Design.
It builds upon a WidgetsApp by adding Material specific functionality.You can also use a WidgetsApp as your app widget, which provides some of the
same functionality, but is not as rich as MaterialApp.To customize the colors and styles of any child components, pass a
ThemeData object to the MaterialApp widget. For example, in the code below,
the color scheme from seed is set to deepPurple and text selection color is red.
<code_start>import 'package:flutter/material.dart';
class SampleApp extends StatelessWidget {
const SampleApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Sample App',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
textSelectionTheme:
const TextSelectionThemeData(selectionColor: Colors.red),
),
home: const SampleAppPage(),
);
}
}<code_end>
<topic_end>
<topic_start>
Databases and local storage
<topic_end>
<topic_start>
How do I access Shared Preferences?
In Android, you can store a small collection of key-value pairs using
the SharedPreferences API.In Flutter, access this functionality using the
Shared_Preferences plugin.
This plugin wraps the functionality of both
Shared Preferences and NSUserDefaults (the iOS equivalent).
<code_start>import 'dart:async';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(
const MaterialApp(
home: Scaffold(
body: Center(
child: ElevatedButton(
onPressed: _incrementCounter,
child: Text('Increment Counter'),
),
),
),
),
);
}
Future<void> _incrementCounter() async {
SharedPreferences prefs = await SharedPreferences.getInstance();