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281 lines
8.4 KiB
281 lines
8.4 KiB
import 'dart:io';
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import 'dart:math';
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import 'dart:typed_data';
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import 'package:flutter_udid/flutter_udid.dart';
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import 'package:flutter/material.dart';
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import 'package:image_picker/image_picker.dart';
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import 'package:nearby_connections/nearby_connections.dart';
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void main() => runApp(MyApp());
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class MyApp extends StatefulWidget {
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@override
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_MyAppState createState() => _MyAppState();
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}
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class _MyAppState extends State<MyApp> {
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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home: Scaffold(
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appBar: AppBar(
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title: const Text('Nearby Connections example app'),
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),
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body: Body(),
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),
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);
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}
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}
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class Body extends StatefulWidget {
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@override
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_MyBodyState createState() => _MyBodyState();
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}
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class _MyBodyState extends State<Body> {
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance!.addPostFrameCallback((_) {
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// _userName = await FlutterUdid.consistentUdid;
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startAdvertising();
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startDiscovery();
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});
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}
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final String userName =
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"00000 11111 22222 33333 44444 55555 66666 77777 88888 99999 aaaaa bbbbb ccccc ddddd eeeee"; // Random().nextInt(10000).toString();
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final Strategy strategy = Strategy.P2P_STAR;
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Map<String, ConnectionInfo> endpointMap = Map();
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static String _userName = "";
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File? tempFile; //reference to the file currently being transferred
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Map<int, String> map =
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Map(); //store filename mapped to corresponding payloadId
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@override
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Widget build(BuildContext context) {
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return Center(
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child: ListView(
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children: <Widget>[
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Text("User Name: " + userName),
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Wrap(
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children: <Widget>[
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ElevatedButton(
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child: Text("Restart"),
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onPressed: () async {
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try {
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stopAll();
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startAdvertising();
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startDiscovery();
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} catch (exception) {
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showSnackbar(exception);
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}
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},
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),
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ElevatedButton(
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child: Text("Stop"),
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onPressed: () async {
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stopAll();
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},
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),
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],
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),
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Text("Number of connected devices: ${endpointMap.length}"),
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ElevatedButton(
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child: Text("Stop All Endpoints"),
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onPressed: () async {
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await Nearby().stopAllEndpoints();
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setState(() {
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endpointMap.clear();
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});
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},
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),
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Divider(),
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Text(
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"Sending Data",
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),
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ElevatedButton(
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child: Text("Send Random Bytes Payload"),
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onPressed: () async {
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endpointMap.forEach((key, value) {
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String a =
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"00000 11111 22222 33333 44444 55555 66666 77777 88888 99999 aaaaa bbbbb ccccc ddddd eeeee"; //Random().nextInt(100).toString();
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showSnackbar("Sending $a to ${value.endpointName}, id: $key");
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Nearby()
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.sendBytesPayload(key, Uint8List.fromList(a.codeUnits));
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});
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},
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),
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ElevatedButton(
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child: Text("Send File Payload"),
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onPressed: () async {
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PickedFile? file =
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await ImagePicker().getImage(source: ImageSource.gallery);
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if (file == null) return;
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for (MapEntry<String, ConnectionInfo> m
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in endpointMap.entries) {
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int payloadId =
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await Nearby().sendFilePayload(m.key, file.path);
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showSnackbar("Sending file to ${m.key}");
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Nearby().sendBytesPayload(
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m.key,
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Uint8List.fromList(
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"$payloadId:${file.path.split('/').last}".codeUnits));
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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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);
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}
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void showSnackbar(dynamic a) {
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ScaffoldMessenger.of(context).showSnackBar(SnackBar(
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content: Text(a.toString()),
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));
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}
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void stopAll() async {
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await Nearby().stopAllEndpoints();
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await Nearby().stopAdvertising();
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await Nearby().stopDiscovery();
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setState(() {});
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}
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void startDiscovery() async {
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try {
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bool a = await Nearby().startDiscovery(
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"dis" + userName,
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strategy,
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onEndpointFound: (id, name, serviceId) {
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print("userName = $userName");
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print("id = $id");
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Nearby().requestConnection(
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userName,
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id,
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onConnectionInitiated: (id, info) {
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discoverOnConnectionInit(id, info);
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},
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onConnectionResult: (id, status) {
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showSnackbar(status);
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},
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onDisconnected: (id) {
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setState(() {
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endpointMap.remove(id);
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});
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showSnackbar(
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"Disconnected from: ${endpointMap[id]!.endpointName}, id $id");
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},
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);
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},
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onEndpointLost: (id) {
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showSnackbar(
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"Lost discovered Endpoint: ${endpointMap[id]!.endpointName}, id $id");
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},
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);
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showSnackbar("DISCOVERING: " + a.toString());
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} catch (e) {
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showSnackbar(e);
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}
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setState(() {});
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}
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void startAdvertising() async {
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try {
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bool a = await Nearby().startAdvertising(
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"adv" + userName,
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strategy,
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onConnectionInitiated: discoverOnConnectionInit,
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onConnectionResult: (id, status) {
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print("userName = $userName");
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print("id = $id");
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showSnackbar(status);
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},
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onDisconnected: (id) {
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showSnackbar(
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"Disconnected: ${endpointMap[id]!.endpointName}, id $id");
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setState(() {
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endpointMap.remove(id);
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});
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},
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);
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showSnackbar("ADVERTISING: " + a.toString());
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} catch (exception) {
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showSnackbar(exception);
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}
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setState(() {});
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}
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/// Called upon Connection request (on both devices)
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/// Both need to accept connection to start sending/receiving
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void discoverOnConnectionInit(String id, ConnectionInfo info) {
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setState(() {
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endpointMap[id] = info;
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});
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Nearby().acceptConnection(
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id,
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onPayLoadRecieved: (endid, payload) async {
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print(payload);
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if (payload.type == PayloadType.BYTES) {
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String str = String.fromCharCodes(payload.bytes!);
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showSnackbar(endid + ": " + str);
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if (str.contains(':')) {
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// used for file payload as file payload is mapped as
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// payloadId:filename
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int payloadId = int.parse(str.split(':')[0]);
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String fileName = (str.split(':')[1]);
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if (map.containsKey(payloadId)) {
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if (await tempFile!.exists()) {
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tempFile!.rename(tempFile!.parent.path + "/" + fileName);
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} else {
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showSnackbar("File doesn't exist");
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}
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} else {
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//add to map if not already
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map[payloadId] = fileName;
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}
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}
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} else if (payload.type == PayloadType.FILE) {
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showSnackbar(endid + ": File transfer started");
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tempFile = File(payload.filePath!);
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}
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},
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onPayloadTransferUpdate: (endid, payloadTransferUpdate) {
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if (payloadTransferUpdate.status == PayloadStatus.IN_PROGRESS) {
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print(payloadTransferUpdate.bytesTransferred);
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} else if (payloadTransferUpdate.status == PayloadStatus.FAILURE) {
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print("failed");
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showSnackbar(endid + ": FAILED to transfer file");
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} else if (payloadTransferUpdate.status == PayloadStatus.SUCCESS) {
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showSnackbar(
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"$endid success, total bytes = ${payloadTransferUpdate.totalBytes}");
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if (map.containsKey(payloadTransferUpdate.id)) {
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//rename the file now
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String name = map[payloadTransferUpdate.id]!;
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tempFile!.rename(tempFile!.parent.path + "/" + name);
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} else {
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//bytes not received till yet
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map[payloadTransferUpdate.id] = "";
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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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///
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///
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}
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