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import 'dart:io' show Platform;
import 'package:badge/device_details.dart';
import 'package:badge/device_scan_select.dart';
import 'package:flutter/material.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';
import 'package:logger/logger.dart';
import 'package:permission_handler/permission_handler.dart';
var logger = Logger(printer: PrettyPrinter());
class ScanPage extends StatefulWidget {
const ScanPage({super.key, required this.title});
// Original doc: Fields in a Widget subclass are always marked "final".
final String title;
@override
State<ScanPage> createState() => _ScanPageState();
}
class _ScanPageState extends State<ScanPage> {
List<ScanResult> scanResults = [];
bool isScanning = false;
ScanResult? selectedDevice;
void _doConnect() async {
var dev = selectedDevice?.device;
if (dev == null) return;
//???
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DeviceDetailsScreen(btDevice: dev),
),
);
}
void _doScan() async {
var system = await FlutterBluePlus.systemDevices([]);
for (var d in system) {
logger.i('${d.platformName} already connected to! ${d.remoteId}');
}
setState(() {
selectedDevice = null;
scanResults = [];
isScanning = true;
});
var subscription = FlutterBluePlus.scanResults.listen(
onScanResult,
onError: (e) => logger.e(e),
);
// either this, or the cancel in the finally block, should do the same?
FlutterBluePlus.cancelWhenScanComplete(subscription);
try {
if (Platform.isAndroid) {
// Ehhhh... can't have both keyword/services
await FlutterBluePlus.startScan(
withKeywords: ["NimBLE"],
timeout: Duration(seconds: 5),
);
} else {
// for Linux, which can't do advNames (but platformname, for whatever reason)
// msd doesn't work, either????
await FlutterBluePlus.startScan(
//withMsd: [MsdFilter(0xffff, data: ascii.encode("uvok"))],
timeout: Duration(seconds: 5),
);
}
// wait for scanning to stop
await FlutterBluePlus.isScanning.where((val) => val == false).first;
} finally {
subscription.cancel();
setState(() {
isScanning = false;
});
}
}
void onScanResult(List<ScanResult> results) {
if (results.isNotEmpty) {
for (var r in results.where(
(d) => d.rssi > -90 && !_deviceInResults(d),
)) {
logger.i(
'${r.device.remoteId}: "${r.device.platformName}" / "${r.device.advName}" / "${r.advertisementData.advName}" found!',
);
scanResults.add(r);
}
setState(() {});
}
}
bool _deviceInResults(ScanResult incomingDev) => scanResults.any(
(existingDev) => existingDev.device.remoteId == incomingDev.device.remoteId,
);
Future getPermissions() async {
try {
await Permission.bluetooth.request();
} catch (e) {
logger.e(e.toString());
}
}
void btHandler(BluetoothAdapterState event) {
logger.i(event);
switch (event) {
case BluetoothAdapterState.on:
break;
default:
break;
}
}
@override
void initState() {
super.initState();
getPermissions();
FlutterBluePlus.adapterState.listen(btHandler);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: Center(
child: Column(
// TRY THIS: Invoke "debug painting" (choose the "Toggle Debug Paint"
// action in the IDE, or press "p" in the console), to see the
// wireframe for each widget.
mainAxisAlignment: MainAxisAlignment.center,
spacing: 24,
children: <Widget>[
SizedBox(height: 15),
Row(
mainAxisAlignment: MainAxisAlignment.center,
spacing: 15.0,
children: [
ElevatedButton(
onPressed: isScanning ? null : _doScan,
child: isScanning ? Text("Scanning...") : Text("Start scan"),
),
ElevatedButton(
onPressed: (selectedDevice == null || isScanning)
? null
: _doConnect,
child: Text("Connect"),
),
],
),
Expanded(
child: DeviceScanSelection(
items: scanResults,
onItemSelected: (item) {
setState(() => selectedDevice = item);
},
),
),
],
),
),
);
}
}
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