feat(example): create a small example
This commit is contained in:
ksenia312
+411
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@@ -1,14 +1,421 @@
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import 'dart:async';
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import 'dart:io';
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import 'package:file_picker/file_picker.dart';
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import 'package:flutter/material.dart';
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import 'package:nearby_service/nearby_service.dart';
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import 'package:path_provider/path_provider.dart';
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Future<void> main() async {
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runApp(const MyApp());
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runApp(const App());
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}
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class MyApp extends StatelessWidget {
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const MyApp({super.key});
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enum AppState { idle, ready, discovering, connected }
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class App extends StatelessWidget {
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const App({super.key});
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@override
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Widget build(BuildContext context) {
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return Container();
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return MaterialApp(
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title: 'Nearby Service Example',
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home: Scaffold(
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appBar: AppBar(title: const Text('Nearby Service Example')),
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body: Container(
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alignment: Alignment.topCenter,
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padding: const EdgeInsets.all(20),
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child: const AppBody(),
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),
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),
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);
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}
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}
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class AppBody extends StatefulWidget {
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const AppBody({super.key});
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@override
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State<AppBody> createState() => _AppBodyState();
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}
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class _AppBodyState extends State<AppBody> {
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final _nearbyService = NearbyService.getInstance(
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logLevel: NearbyServiceLogLevel.debug,
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);
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AppState _state = AppState.idle;
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bool _isIosBrowser = true;
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List<NearbyDevice> _peers = [];
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NearbyDevice? _connectedDevice;
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StreamSubscription? _peersSubscription;
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List<PlatformFile> _pickedFiles = [];
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String _message = '';
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Timer? _connectionCheckTimer;
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@override
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void initState() {
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_initialize();
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super.initState();
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}
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@override
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void dispose() {
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_peersSubscription?.cancel();
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_connectionCheckTimer?.cancel();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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if (_state == AppState.idle) {
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (Platform.isIOS)
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Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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Center(
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child: Text(
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'You are ${_isIosBrowser ? 'Browser' : 'Advertiser'}',
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),
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),
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Switch(
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value: _isIosBrowser,
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onChanged: (value) => setState(() => _isIosBrowser = value),
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),
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],
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),
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ElevatedButton(
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onPressed: _preparePlatforms,
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child: const Text('Prepare Platforms'),
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),
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],
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);
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} else if (_state == AppState.ready) {
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return ElevatedButton(
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onPressed: _discovery,
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child: const Text('Start discovery'),
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);
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} else if (_state == AppState.discovering) {
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return ListView(
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children: [
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if (Platform.isIOS)
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Text(
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'You are ${_isIosBrowser ? 'Browser' : 'Advertiser'}',
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),
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..._peers.map(
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(e) => ListTile(
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title: Text(
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'${_isIosBrowser ? 'Found device' : 'Pending invitation'} | ${e.info.displayName} | ${e.status.name}',
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),
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onTap: () => _connect(e),
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tileColor: Colors.blueAccent,
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textColor: Colors.white,
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),
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),
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],
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);
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} else if (_state == AppState.connected) {
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return SingleChildScrollView(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.start,
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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DecoratedBox(
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decoration: const BoxDecoration(
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color: Colors.blueAccent,
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),
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child: Padding(
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padding: const EdgeInsets.all(20.0),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text(
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_connectedDevice!.info.displayName,
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style: const TextStyle(color: Colors.white),
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),
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ElevatedButton(
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onPressed: _disconnect,
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child: const Text('Disconnect'),
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),
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],
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),
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),
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),
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const SizedBox(height: 50),
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Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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TextField(
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onChanged: (value) => setState(() => _message = value),
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decoration: const InputDecoration(
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hintText: 'Enter your message',
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),
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),
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const SizedBox(height: 10),
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ElevatedButton(
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onPressed: () {
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_send(NearbyMessageTextRequest.create(value: _message));
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},
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child: const Text('Send message'),
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),
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],
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),
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const SizedBox(height: 50),
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Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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ElevatedButton(
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onPressed: () async {
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final result = await FilePicker.platform.pickFiles(
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allowMultiple: true,
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);
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if (result != null) {
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setState(
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() => _pickedFiles = result.files,
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);
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}
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},
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child: const Text('Pick the files'),
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),
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ElevatedButton(
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onPressed: () {
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_send(
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NearbyMessageFilesRequest.create(
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files: [
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..._pickedFiles.map(
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(e) => NearbyFileInfo(path: e.path!),
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),
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],
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),
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);
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},
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child: const Text('Send files'),
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),
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const Text('Picked files:', style: TextStyle(fontSize: 16)),
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..._pickedFiles.map((e) => Text(e.name)),
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],
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)
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],
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),
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);
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}
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return Container();
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}
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Future<void> _initialize() async {
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await _nearbyService.initialize();
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}
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Future<void> _preparePlatforms() async {
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bool result;
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if (Platform.isAndroid) {
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final isGranted = await _nearbyService.android?.requestPermissions();
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final wifiEnabled = await _nearbyService.android?.checkWifiService();
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result = (isGranted ?? false) && (wifiEnabled ?? false);
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} else if (Platform.isIOS) {
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_nearbyService.ios?.setIsBrowser(value: _isIosBrowser);
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result = true;
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} else {
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result = false;
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}
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if (result) {
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setState(() {
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_state = AppState.ready;
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});
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}
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}
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Future<void> _discovery() async {
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final result = await _nearbyService.discover();
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if (result) {
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setState(() {
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_state = AppState.discovering;
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});
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_peersSubscription = _nearbyService.getPeersStream().listen((event) {
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setState(() {
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_peers = event;
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});
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});
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}
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}
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Future<void> _connect(NearbyDevice device) async {
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final result = await _nearbyService.connect(device);
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if (result) {
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_connectionCheckTimer = Timer.periodic(
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const Duration(seconds: 3),
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(_) {
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try {
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final selectedDevice = _peers.firstWhere(
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(element) => element.info.id == device.info.id,
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);
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if (selectedDevice.status.isConnected) {
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_connectionCheckTimer?.cancel();
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_connectionCheckTimer = null;
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_nearbyService.startCommunicationChannel(
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NearbyCommunicationChannelData(
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device.info.id,
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messagesListener: NearbyServiceMessagesListener(
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onCreated: () {
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setState(() {
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_connectedDevice = device;
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_state = AppState.connected;
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});
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},
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onData: _messagesListener,
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onError: (e, [StackTrace? s]) {
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setState(() {
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_connectedDevice = null;
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_state = AppState.discovering;
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});
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},
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onDone: () {
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setState(() {
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_connectedDevice = null;
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_state = AppState.discovering;
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});
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},
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),
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filesListener: NearbyServiceFilesListener(
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onData: _filesListener,
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),
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),
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);
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}
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} finally {}
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},
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);
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}
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}
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Future<void> _disconnect() async {
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try {
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await _nearbyService.disconnect(_connectedDevice!);
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} finally {
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await _nearbyService.endCommunicationChannel();
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await _nearbyService.stopDiscovery();
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await _peersSubscription?.cancel();
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setState(() {
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_state = AppState.idle;
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});
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}
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}
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void _messagesListener(ReceivedNearbyMessage<NearbyMessageContent> message) {
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if (_connectedDevice == null) return;
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message.content.byType(
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onTextRequest: (request) {
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AppSnackBar.show(
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context,
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title: request.value,
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subtitle: message.sender.displayName,
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).whenComplete(
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() => _send(NearbyMessageTextResponse(id: request.id)),
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);
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},
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onTextResponse: (response) {
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AppSnackBar.show(
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context,
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title: 'Message ${response.id} was delivered',
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subtitle: message.sender.displayName,
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);
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},
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onFilesRequest: (request) {
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AppSnackBar.show(
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context,
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title: 'Request to receive ${request.files.length} files',
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subtitle: message.sender.displayName,
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actionName: 'Accept the files?',
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onAcceptAction: () {
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_send(
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NearbyMessageFilesResponse(id: request.id, isAccepted: true),
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);
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},
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);
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},
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onFilesResponse: (response) {
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AppSnackBar.show(
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context,
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title: 'Response ${response.id} for the files '
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'${response.isAccepted ? 'is accepted' : 'was denied'}',
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subtitle: message.sender.displayName,
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);
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},
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);
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}
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void _filesListener(ReceivedNearbyFilesPack pack) {
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FilesSaver.savePack(pack).then(
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(value) => AppSnackBar.show(context, title: 'Files pack was saved'),
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);
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}
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Future<void> _send(NearbyMessageContent content) async {
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if (_connectedDevice == null) return;
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await _nearbyService.send(
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OutgoingNearbyMessage(content: content, receiver: _connectedDevice!.info),
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);
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}
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}
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class AppSnackBar {
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AppSnackBar._();
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static Future<void> show(
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BuildContext context, {
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required String title,
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String? subtitle,
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String? actionName,
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VoidCallback? onAcceptAction,
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}) async {
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final content = Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Text(title, style: const TextStyle(fontSize: 16)),
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if (subtitle != null) Text(subtitle),
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],
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);
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final action = onAcceptAction != null && actionName != null
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? SnackBarAction(
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label: actionName,
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onPressed: onAcceptAction,
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)
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: null;
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final messenger = ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: content,
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action: action,
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),
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);
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return messenger.closed.then((value) => null);
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}
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}
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class FilesSaver {
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FilesSaver._();
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static Future<List<NearbyFileInfo>> savePack(
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ReceivedNearbyFilesPack pack,
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) async {
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final files = <NearbyFileInfo>[];
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final directory = Platform.isAndroid
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? Directory('storage/emulated/0/Download')
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: await getApplicationDocumentsDirectory();
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for (final nearbyFile in pack.files) {
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final newFile = await File(nearbyFile.path).copy(
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'${directory.path}/${DateTime.now().microsecondsSinceEpoch}.${nearbyFile.extension}',
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);
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if (!await newFile.exists()) {
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await newFile.create();
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}
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files.add(NearbyFileInfo(path: newFile.path));
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}
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return files;
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}
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}
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