修改蓝牙读写功能

lib/controllers/ble_service.dart

 import 'dart:async';
+import 'dart:io';
 
 import 'package:anchor_collect_flutter/utils/dialog_utils.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_reactive_ble/flutter_reactive_ble.dart';
+import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import 'package:get/get.dart';
 import 'package:isar/isar.dart';
 import 'package:permission_handler/permission_handler.dart';
+import 'package:uuid/uuid.dart';
 
 import '../models/cattle_resume_entity.dart';
 import '../models/dict_entity.dart';
@@ -21,34 +23,39 @@ class BleService extends GetxService {
   late DiscoveredCallback? discoveredCallback;
   late ConnectCallback? connectCallback;
 
-  // 添加一个 StreamController
-  final _readController = StreamController<List<int>>();
+  late BluetoothService _service;
+  late BluetoothCharacteristic _writeCharacteristic;
+  late BluetoothCharacteristic _notifyCharacteristic;
 
-  Stream<List<int>> get readStream => _readController.stream;
+  late
 
-  late Uuid _serviceId;
-  late Uuid _writeCharacteristicId;
-  late Uuid _notifiCharacteristicId;
+      // 读取数据的 Stream
+      List<BluetoothDevice> _systemDevices = [];
 
-  // 添加一个标志，用于控制读取循环是否应该继续
-  bool _shouldContinueReading = false;
+  //
+  List<ScanResult> _scanResults = [];
+  RxBool isScanning = false.obs;
+  late StreamSubscription<List<ScanResult>> _scanResultsSubscription;
+  late StreamSubscription<bool> _isScanningSubscription;
 
-  var isScanning = false.obs;
-  final ble = FlutterReactiveBle();
+  late StreamSubscription<BluetoothConnectionState>
+      _connectionStateSubscription;
 
-  //判断是否正在扫描
-  StreamSubscription<DiscoveredDevice>? scanSubscription;
+  late StreamSubscription<List<int>> _lastValueSubscription;
+  late StreamSubscription<List<int>> _valueReceivedSubscription;
 
-  //判断设备选中状态
-  final selectedDevice = Rx<DiscoveredDevice?>(null);
-
-  //判断设备连接状态
-  String deviceStatus = '';
-
-  // ignore: cancel_subscriptions
-  late StreamSubscription<ConnectionStateUpdate> streamSubscriptionConnection;
+  late BluetoothDevice selectedDevice;
 
   Future<BleService> init() async {
+    _isScanningSubscription = FlutterBluePlus.isScanning.listen((state) {
+      isScanning.value = state;
+    });
+
+    _scanResultsSubscription = FlutterBluePlus.scanResults.listen((results) {
+      _scanResults = results;
+    }, onError: (e) {
+      DialogUtils.showToast('扫描错误');
+    });
     return this;
   }
 
@@ -56,7 +63,7 @@ class BleService extends GetxService {
   Future<void> toggleScan(DiscoveredCallback callback) async {
     discoveredCallback = callback;
     if (isScanning.value) {
-      await scanSubscription?.cancel();
+      FlutterBluePlus.stopScan();
       isScanning.value = false;
     } else {
       await scanDevices();
@@ -68,130 +75,93 @@ class BleService extends GetxService {
     // 检查权限
     bool permissionsGranted = await requestBlePermissions();
     if (!permissionsGranted) {
-      Get.snackbar('Permissions required', 'Please grant all necessary permissions');
+      DialogUtils.showToast('请授予所有必要的权限');
       return;
     }
     // 扫描开始时，设置 isScanning 为 true
     isScanning.value = true;
 
-    // 扫描设备
-    final scanStream = ble.scanForDevices(
-      withServices: [],
-
-      //scanMode: ScanMode.balanced,  // 将 scanMode 设置为 balanced 功耗均衡，扫描慢
-      scanMode: ScanMode.lowLatency, // 将 scanMode 设置为 lowLatency 功耗大 扫描快
-    );
-
-    // 监听扫描结果
-    scanSubscription = scanStream.listen((device) {
-      // 如果设备名称不为空，且列表中没有该设备，则添加到列表中
-      if (device.name != null && device.name!.isNotEmpty) {
-        if (discoveredCallback != null) {
-          discoveredCallback!(device);
-        }
-      }
-    });
+    try {
+      // android is slow when asking for all advertisments,
+      // so instead we only ask for 1/8 of them
+      int divisor = Platform.isAndroid ? 8 : 1;
+      await FlutterBluePlus.startScan(
+          timeout: const Duration(seconds: 15),
+          continuousUpdates: true,
+          continuousDivisor: divisor);
+    } catch (e) {
+      DialogUtils.showToast('扫描错误');
+    }
 
     ///扫描10秒
-    Future.delayed(const Duration(seconds: 15), () async {
-      await scanSubscription?.cancel();
-      isScanning.value = false;
-      DialogUtils.showToast('自动停止扫描');
-    });
+    // Future.delayed(const Duration(seconds: 15), () async {
+    //   FlutterBluePlus.stopScan();
+    //   isScanning.value = false;
+    //   DialogUtils.showToast('自动停止扫描');
+    // });
   }
 
   // 连接设备
-  Future<void> connectToDevice(DiscoveredDevice device, BuildContext context, ConnectCallback callback) async {
+  Future<void> connectToDevice(BluetoothDevice device, BuildContext context, ConnectCallback callback) async {
     connectCallback = callback;
-    selectedDevice.value = device; // 设置当前选中的设备
+    selectedDevice = device; // 设置当前选中的设备
 
-    await scanSubscription?.cancel(); // 在连接设备之前，停止扫描
+    // 在连接设备之前，停止扫描
+    await FlutterBluePlus.stopScan();
     isScanning.value = false; // 设置 isScanning 为 false
 
     DialogUtils.showLoadingDialog('正在连接到 ${device.name}');
-    // 显示正在连接的对话框
-    // showDialog(
-    //   context: context,
-    //   barrierDismissible: false,
-    //   builder: (BuildContext context) {
-    //     return AlertDialog(
-    //       title: Text('Connecting to ${device.name}'),
-    //       content: CircularProgressIndicator(),
-    //     );
-    //   },
-    // );
-
-    // 连接设备
-    var connection = ble.connectToDevice(
-      id: device.id,
-      connectionTimeout: const Duration(milliseconds: 10000),
-      servicesWithCharacteristicsToDiscover: {},
-    );
-
-    // 监听连接状态
-    streamSubscriptionConnection = connection.listen((update) async {
-      // 如果连接状态为 connected，则显示连接成功的提示
-      if (update.connectionState == DeviceConnectionState.connected) {
-        // 发现服务和特性
-        final services = await ble.discoverServices(device.id);
-        for (final service in services) {
-          if (service.serviceId.toString() == '000180') {
-            _serviceId = service.serviceId;
-            if (kDebugMode) {
-              print('Discovered service ${service.serviceId}');
-            }
-            for (final characteristic in service.characteristics) {
-              if(characteristic.isWritableWithoutResponse) {
-                _writeCharacteristicId = characteristic.characteristicId;
-                if (kDebugMode) {
-                  print('WritableWithoutResponse characteristic ${characteristic.characteristicId} of service ${service.serviceId}');
-                }
+    // listen for disconnection
+    _connectionStateSubscription = device.connectionState.listen((BluetoothConnectionState state) async {
+      if (state == BluetoothConnectionState.disconnected) {
+        // 1. typically, start a periodic timer that tries to
+        //    reconnect, or just call connect() again right now
+        // 2. you must always re-discover services after disconnection!
+        DialogUtils.showToast('断开连接');
+        print(
+            "${device.disconnectReason!.code} ${device.disconnectReason!.description}");
+      } else if (state == BluetoothConnectionState.connected) {
+        // Note: You must call discoverServices after every re-connection!
+        List<BluetoothService> services = await device.discoverServices();
+        services.forEach((service) {
+          //打印所有服务的 uuid
+          print('service uuid: ${service.uuid}');
+          if (!service.serviceUuid.toString().contains('000180')) {
+            _service = service;
+            //打印 service uuid
+            print('service uuid: ${service.uuid}');
+            var characteristics = service.characteristics;
+            for (BluetoothCharacteristic c in characteristics) {
+              if (c.properties.write) {
+                //打印写的特征值 uuid
+                print('write characteristic uuid: ${c.uuid}');
+                _writeCharacteristic = c;
               }
-              if(characteristic.isNotifiable) {
-                _notifiCharacteristicId = characteristic.characteristicId;
-                if (kDebugMode) {
-                  print('Notifiable characteristic ${characteristic.characteristicId} of service ${service.serviceId}');
-                }
+              if (c.properties.notify) {
+                //打印通知的特征值 uuid
+                print('notify characteristic uuid: ${c.uuid}');
+                _notifyCharacteristic = c;
+                c.setNotifyValue(true);
+
+                // _lastValueSubscription = c.lastValueStream.listen((value) {
+                //   print(value);
+                // });
+                _valueReceivedSubscription = c.onValueReceived.listen((value) {
+                  print(value);
+                });
               }
             }
           }
-        }
-        // 设置最大传输单元
-        await ble.requestMtu(deviceId: device.id, mtu: 512);
-        await Future.delayed(const Duration(seconds: 1)); // 添加延迟
-        deviceStatus = 'Connected'; // 更新设备的连接状态
-        // Get.snackbar('Connected', 'Connected to ${device.name}');
-        // Navigator.of(context).pop();
-        if (connectCallback != null) {
-          connectCallback!(device);
-        }
-
-        // 关闭对话框
-        DialogUtils.dismissDialog();
-      } else if (update.connectionState == DeviceConnectionState.connecting) {
-        DialogUtils.showToast('设备连接中');
-      } else {
-        DialogUtils.dismissDialog();
-        DialogUtils.showToast('连接设备失败');
-        deviceStatus = 'Disconnected'; // 更新设备的连接状态
+        });
+      } else if (state == BluetoothConnectionState.connecting) {
+        DialogUtils.showToast('正在连接');
       }
     });
-  }
-
-  // 读取数据
-  Future<List<int>> readData() async {
-    if (selectedDevice.value == null) {
-      throw Exception('No device connected');
-    }
-    final characteristic = QualifiedCharacteristic(
-      deviceId: selectedDevice.value!.id,
-      serviceId: _serviceId,
-      characteristicId: _writeCharacteristicId,
-    );
-
-    final result = await ble.readCharacteristic(characteristic);
 
-    return result;
+    // 连接设备
+    await device.connect().catchError((onError) {
+      DialogUtils.showToast('连接设备失败$onError');
+    });
   }
 
 // 写入数据
@@ -209,31 +179,6 @@ class BleService extends GetxService {
     await ble.writeCharacteristicWithResponse(characteristic, value: data);
   }
 
-  // 启动循环读取数据
-  Future<void> startReading() async {
-    _shouldContinueReading = true;
-
-    while (_shouldContinueReading) {
-      // 读取数据
-      final data = await readData();
-      // 将数据添加到 Stream 中
-      _readController.add(data);
-      // 等待一段时间，然后再次读取数据
-      await Future.delayed(const Duration(seconds: 1));
-    }
-  }
-
-  // 停止循环读取数据
-  void stopReading() {
-    _shouldContinueReading = false;
-  }
-
-  @override
-  void onClose() {
-    _readController.close();
-    super.onClose();
-  }
-
   // 检查权限
   Future<bool> requestBlePermissions() async {
     var isLocationGranted = await Permission.locationWhenInUse.request();
@@ -253,4 +198,9 @@ class BleService extends GetxService {
         isBleConnectGranted == PermissionStatus.granted &&
         isBleAdvertiseGranted == PermissionStatus.granted;
   }
+
+  dipose() {
+    _isScanningSubscription.cancel();
+    _scanResultsSubscription.cancel();
+  }
 }