Getting Started with BLE and GATT in Flutter (part-1)

				
					
import 'dart:async';


import 'package:flutter/material.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart';


class BleScanner extends StatefulWidget {
 const BleScanner({super.key});


@override
 State<BleScanner> createState() => _BleScannerState();
}

class _BleScannerState extends State<BleScanner> {
 final List<ScanResult> scanResults = [];
 StreamSubscription<List<ScanResult>>? _scanSubscription;

Future<void> startScan() async{
   FlutterBluePlus.stopScan();
   _scanSubscription?.cancel();
 await FlutterBluePlus.startScan(timeout: const Duration(seconds: 5));


   _scanSubscription = FlutterBluePlus.scanResults.listen((results) {
     if (!mounted) return;
     setState(() {
       scanResults
         ..clear()
         ..addAll(results);
     });
   });
 }

@override
 void initState() {
   super.initState();
   startScan();
 }

 @override
 void dispose() {
   FlutterBluePlus.stopScan();
   _scanSubscription?.cancel();
   super.dispose();
 }
 
 @override
 Widget build(BuildContext context) {
   return Scaffold(
     appBar: AppBar(title: const Text("BLE Scanner")),
     body: ListView.builder(
       itemCount: scanResults.length,
       itemBuilder: (context, index) {
         final result = scanResults[index];
         final deviceName = result.device.platformName.isNotEmpty
             ? result.device.platformName
             : "Unknown Device";
return ListTile(
           title: Text(deviceName),
           subtitle: Text(result.device.remoteId.toString()),
         );
       },
     ),
     floatingActionButton: FloatingActionButton(
       onPressed: startScan,
       child: const Icon(Icons.search),
     ),
   );
 }
}