Flutter Blue 是一个用于与蓝牙设备进行通信的 Flutter 插件。它允许开发者扫描、连接、发现服务和特征,并读写蓝牙设备的数据。以下是使用 Flutter Blue 发送字符串的基础概念和相关信息:
import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: BluetoothScreen(),
);
}
}
class BluetoothScreen extends StatefulWidget {
@override
_BluetoothScreenState createState() => _BluetoothScreenState();
}
class _BluetoothScreenState extends State<BluetoothScreen> {
FlutterBlue flutterBlue = FlutterBlue.instance;
List<ScanResult> scanResults = [];
@override
void initState() {
super.initState();
startScan();
}
void startScan() {
flutterBlue.startScan(timeout: Duration(seconds: 4));
flutterBlue.scanResults.listen((results) {
setState(() {
scanResults = results;
});
});
}
void connectToDevice(ScanResult result) async {
Device device = result.device;
await device.connect();
device.discoverServices().then((services) {
services.forEach((service) {
service.characteristics.forEach((characteristic) {
if (characteristic.uuid.toString() == 'YOUR_CHARACTERISTIC_UUID') {
Uint8List bytes = utf8.encode('Hello, Bluetooth!');
characteristic.write(bytes);
}
});
});
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Bluetooth Example')),
body: ListView.builder(
itemCount: scanResults.length,
itemBuilder: (context, index) {
ScanResult result = scanResults[index];
return ListTile(
title: Text(result.device.name),
onTap: () => connectToDevice(result),
);
},
),
);
}
}
请将 'YOUR_CHARACTERISTIC_UUID'
替换为实际的特征 UUID。希望这些信息对你有所帮助!
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