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'/b': (context) => const MyPage(title: 'page B'),
'/c': (context) => const MyPage(title: 'page C'),
},
));
}<code_end>
Navigate to a route by pushing its name to the Navigator.
<code_start>Navigator.of(context).pushNamed('/b');<code_end>
The other popular use-case for Intents is to call external components such
as a Camera or File picker. For this, you would need to create a native platform
integration (or use an existing plugin).To learn how to build a native platform integration,
see developing packages and plugins.<topic_end>
<topic_start>
How do I handle incoming intents from external applications in Flutter?
Flutter can handle incoming intents from Android by directly talking to the
Android layer and requesting the data that was shared.The following example registers a text share intent filter on the native
activity that runs our Flutter code, so other apps can share text with
our Flutter app.The basic flow implies that we first handle the shared text data on the
Android native side (in our Activity), and then wait until Flutter requests
for the data to provide it using a MethodChannel.First, register the intent filter for all intents in AndroidManifest.xml:Then in MainActivity, handle the intent, extract the text that was
shared from the intent, and hold onto it. When Flutter is ready to process,
it requests the data using a platform channel, and it’s sent
across from the native side:Finally, request the data from the Flutter side
when the widget is rendered:
<code_start>import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
void main() {
runApp(const SampleApp());
}
class SampleApp extends StatelessWidget {
const SampleApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Sample Shared App Handler',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: const SampleAppPage(),
);
}
}
class SampleAppPage extends StatefulWidget {
const SampleAppPage({super.key});
@override
State<SampleAppPage> createState() => _SampleAppPageState();
}
class _SampleAppPageState extends State<SampleAppPage> {
static const platform = MethodChannel('app.channel.shared.data');
String dataShared = 'No data';
@override
void initState() {
super.initState();
getSharedText();
}
@override
Widget build(BuildContext context) {
return Scaffold(body: Center(child: Text(dataShared)));
}
Future<void> getSharedText() async {
var sharedData = await platform.invokeMethod('getSharedText');
if (sharedData != null) {
setState(() {
dataShared = sharedData;
});
}
}
}<code_end>
<topic_end>
<topic_start>
What is the equivalent of startActivityForResult()?
The Navigator class handles routing in Flutter and is used to get
a result back from a route that you have pushed on the stack.
This is done by awaiting on the Future returned by push().For example, to start a location route that lets the user select
their location, you could do the following:
<code_start>Object? coordinates = await Navigator.of(context).pushNamed('/location');<code_end>
And then, inside your location route, once the user has selected their location
you can pop the stack with the result:
<code_start>Navigator.of(context).pop({'lat': 43.821757, 'long': -79.226392});<code_end>
<topic_end>
<topic_start>
Async UI
<topic_end>
<topic_start>
What is the equivalent of runOnUiThread() in Flutter?
Dart has a single-threaded execution model, with support for Isolates
(a way to run Dart code on another thread), an event loop, and
asynchronous programming. Unless you spawn an Isolate, your Dart code
runs in the main UI thread and is driven by an event loop. Flutter’s event
loop is equivalent to Android’s main Looper—that is, the Looper that
is attached to the main thread.Dart’s single-threaded model doesn’t mean you need to run everything as a
blocking operation that causes the UI to freeze. Unlike Android, which
requires you to keep the main thread free at all times, in Flutter,
use the asynchronous facilities that the Dart language provides, such as
async/await, to perform asynchronous work. You might be familiar with
the async/await paradigm if you’ve used it in C#, Javascript, or if you
have used Kotlin’s coroutines.For example, you can run network code without causing the UI to hang by
using async/await and letting Dart do the heavy lifting:
<code_start>Future<void> loadData() async {
var dataURL = Uri.parse('https://jsonplaceholder.typicode.com/posts');