请写出上面设计的代码
时间: 2024-02-28 08:54:31 浏览: 27
好的,以下是一个简单的蓝牙控制页面的Flutter代码示例:
```dart
import 'package:flutter/material.dart';
import 'package:flutter_blue/flutter_blue.dart';
class BluetoothControlPage extends StatefulWidget {
@override
_BluetoothControlPageState createState() => _BluetoothControlPageState();
}
class _BluetoothControlPageState extends State<BluetoothControlPage> {
FlutterBlue flutterBlue = FlutterBlue.instance;
List<BluetoothDevice> devicesList = [];
BluetoothDevice _connectedDevice;
BluetoothCharacteristic _writeCharacteristic;
@override
void initState() {
super.initState();
// Initialize Bluetooth adapter
flutterBlue.state.listen((state) {
if (state == BluetoothState.on) {
// Start scanning for devices
_startScan();
} else {
_stopScan();
}
});
}
// Start scanning for devices
void _startScan() {
flutterBlue.startScan(timeout: Duration(seconds: 5));
flutterBlue.scanResults.listen((results) {
for (ScanResult r in results) {
if (!devicesList.contains(r.device)) {
setState(() {
devicesList.add(r.device);
});
}
}
});
}
// Stop scanning for devices
void _stopScan() {
flutterBlue.stopScan();
}
// Connect to a device
void _connectToDevice(BluetoothDevice device) async {
if (_connectedDevice != null) {
_disconnectFromDevice();
}
// Connect to the device
await device.connect();
// Discover services and characteristics
List<BluetoothService> services = await device.discoverServices();
services.forEach((service) {
service.characteristics.forEach((characteristic) {
if (characteristic.uuid.toString() == "your_characteristic_uuid_here") {
_writeCharacteristic = characteristic;
}
});
});
setState(() {
_connectedDevice = device;
});
}
// Disconnect from the device
void _disconnectFromDevice() {
if (_connectedDevice != null) {
_connectedDevice.disconnect();
setState(() {
_connectedDevice = null;
});
}
}
// Write data to the device
void _writeDataToDevice(String data) async {
if (_connectedDevice != null && _writeCharacteristic != null) {
List<int> bytes = data.codeUnits;
await _writeCharacteristic.write(bytes);
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Bluetooth Control'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text('Available Devices:'),
SizedBox(height: 10),
Expanded(
child: ListView.builder(
itemCount: devicesList.length,
itemBuilder: (context, index) {
BluetoothDevice device = devicesList[index];
return ListTile(
title: Text(device.name),
subtitle: Text(device.id.toString()),
onTap: () {
_connectToDevice(device);
},
);
},
),
),
SizedBox(height: 10),
ElevatedButton(
child: Text('Disconnect'),
onPressed: () {
_disconnectFromDevice();
},
),
SizedBox(height: 10),
ElevatedButton(
child: Text('Send Data'),
onPressed: () {
_writeDataToDevice('Hello, World!');
},
),
],
),
),
);
}
}
```
请注意,上面的代码中有一些需要您自己替换的部分,例如`your_characteristic_uuid_here`。您需要将其替换为您自己的特征UUID。另外,由于这只是一个简单示例,可能需要根据您的具体需求进行更改。希望能帮到您!