使用Flutter连接和写入蓝牙设备

dependencies:
  flutter_blue: ^0.8.0

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

<key>NSBluetoothPeripheralUsageDescription</key>
<string>需要蓝牙权限来连接设备</string>
<key>NSBluetoothAlwaysUsageDescription</key>
<string>需要蓝牙权限来连接设备</string>

import 'package:flutter_blue/flutter_blue.dart';

FlutterBlue flutterBlue = FlutterBlue.instance;

// 开始扫描
flutterBlue.startScan(timeout: Duration(seconds: 4));

// 监听扫描结果
var subscription = flutterBlue.scanResults.listen((results) {
    for (ScanResult r in results) {
        print('${r.device.name} found! rssi: ${r.rssi}');
    }
});

// 停止扫描
flutterBlue.stopScan();

BluetoothDevice device; // 从扫描结果中获取设备