项目场景: 地下车库无网路的情况下需要使用蓝牙对小区门禁进行开门
本人掘金文章
坑一: 安卓端引入flutter_blue运行项目报错
1. 原因: 安卓sdk版本需要28以上
2. 解决: android/build.gradle
下修改 compileSdkVersion targetSdkVersion 为 28; minSdkVersion 修改为19
android { ............. compileSdkVersion 28 ............. defaultConfig { minSdkVersion 19 targetSdkVersion 28 } ............. }
坑二: ios引入flutter_blue运行项目报错
1. 原因: windows
创建的 flutter
swift
语言, 而ios
要的是 objc
2. 解决: 新建空目录使用 flutter create -i objc my-flutter-app
创建新项目, 在把原项目下lib
文件夹下的所有文件替换新创建的lib
文件夹, 这就可以了;Android\ios
端都没问题
附上实际项目的源码; 其他的坑暂时就没想起来了,反正坑蛮多,初期运行时也是控制台各种报错
需求简介:
- 执行完一次蓝牙开门之后,就断开连接蓝牙,以降低手机耗能;
- 20s扫码一次蓝牙,扫描时长为10s,以便根据距离搜索新的及强度高的蓝牙设备
- 初始化项目即执行一次蓝牙扫描
import ‘package:flutter_blue/flutter_blue.dart‘; FlutterBlue flutterBlue = FlutterBlue.instance; # // 蓝牙开门 void _blueOpenDoor (Map list) async { var isFirstScan = true; var isConnect = false; _delayed?.cancel(); # // 自定义loading cancel = BotToast.showCustomLoading( ignoreContentClick: true, toastBuilder: (cancelFunc) { return Loading(); } ); blueList.forEach((scanResult) async { # // if (scanResult.device.name == ‘201901012212‘) { if (scanResult.device.name == list["macAddress"]) { print(‘蓝牙设备门禁正在连接~~~~~~~~~‘); await scanResult.device.disconnect(); await scanResult.device.connect(); isConnect = true; print(‘蓝牙设备门禁连接成功~~~~~~~~~‘); # // List<BluetoothDevice> connectedDevices = await flutterBlue.connectedDevices; // if(connectedDevices.contains(scanResult.device)) { // // TO DO // } List<BluetoothService> services = await scanResult.device.discoverServices(); # //遍历蓝牙设备对列表 services.forEach((service) async { if (service.uuid.toString().toUpperCase().substring(4, 8) == ‘FFF0‘) { var characteristics = service.characteristics; for(BluetoothCharacteristic c in characteristics) { if (c.uuid.toString().toUpperCase().substring(4, 8) == ‘FFF1‘) { # // 开门指令 print(‘蓝牙设备门禁服务匹配成功~~~~~~~~~‘); await c.write([0x30, 0x10, 0x02, 0x03 ...........]); print(‘蓝牙设备门禁指令发送成功~~~~~~~~~‘); # // 开门声音 cancel(); _delayed?.cancel(); showOpenDoorDialog(1, list[‘doorControlName‘]); await _audioPlayer.play("https://qinlin-resource.oss-cn-zhangjiakou.aliyuncs.com/wechat/opendoor.mp3"); await scanResult.device.disconnect(); } # // 监听门禁返回 并断开连接 if (c.uuid.toString().toUpperCase().substring(4, 8) == ‘FFF2‘) { # // List<int> value = await c.read(); # // print(‘88888888888888888888888$value‘); await c.setNotifyValue(true); notifySubscription = c.value.listen((value) async { print(‘88888888888888888888888$value‘); cancel(); await scanResult.device.disconnect(); notifySubscription.cancel(); }); } } } }); # // 获取设备连接状态 stateSubscription = scanResult.device.state.listen((s) async { print(‘连接状态连接状态$s‘); switch (s) { # // 蓝牙连接成功 case BluetoothDeviceState.connected: isFirstScan = true; break; case BluetoothDeviceState.disconnected: if (!isFirstScan){ cancel(); _delayed?.cancel(); print(‘蓝牙设备门禁连接失败~~~~~~~~~‘); BotToast.showText( text: ‘蓝牙设备连接失败,请稍后再试‘, align: Alignment(0, 0.1), onlyOne: true, duration: Duration(milliseconds: 2000), contentPadding: const EdgeInsets.all(15.0), ); } break; default: cancel(); _delayed?.cancel(); print(‘蓝牙设备门禁连接失败~~~~~~~~~‘); BotToast.showText( text: ‘蓝牙设备连接失败,请稍后再试‘, align: Alignment(0, 0.1), onlyOne: true, duration: Duration(milliseconds: 2000), contentPadding: const EdgeInsets.all(15.0), ); break; } }); } }); _delayed = Timer.periodic(new Duration(seconds: 15), (timer) { cancel(); if (!isConnect) { BotToast.showText( text: ‘该门禁蓝牙信号较弱,请稍后再试‘, align: Alignment(0, 0.1), onlyOne: true, duration: Duration(milliseconds: 2000), contentPadding: const EdgeInsets.all(15.0), ); } _delayed?.cancel(); }); } # // 15s 定时扫描蓝牙 Future<dynamic> _scanBlue () async { flutterBlue.state.listen((s) { if (s == BluetoothState.on) { setState(() { _isOpenBlue = true; }); FlutterBlue.instance.stopScan(); # // 立即执行一次 _initScan(); _timer = Timer.periodic(new Duration(seconds: 20), (timer) { setState(() { blueList = []; }); scanSubscription = flutterBlue.scan().listen((scanResult) async { if (!blueList.contains(scanResult)) { setState(() { blueList.add(scanResult); }); } }); Future.delayed(Duration(seconds: 10), () { FlutterBlue.instance.stopScan(); scanSubscription?.cancel(); }); }); } else { _timer?.cancel(); if (!_isOpenBlue) { final snackBar = new SnackBar( content: new Text(‘如需要蓝牙开门,请先前往手机设置开启蓝牙‘), backgroundColor: Colors.red, duration: Duration(seconds: 3), action: SnackBarAction( textColor: Colors.white, label: ‘关闭‘, onPressed: () {}, ), ); _scaffoldkey.currentState.showSnackBar(snackBar); } } }); } # // 初始执行扫描 void _initScan () { setState(() { blueList = []; }); scanSubscription = flutterBlue.scan().listen((scanResult) async { if (!blueList.contains(scanResult)) { setState(() { blueList.add(scanResult); }); } }); Future.delayed(Duration(seconds: 10), () { FlutterBlue.instance.stopScan(); scanSubscription?.cancel(); }); }
有问题欢迎留言
原文地址:https://www.cnblogs.com/ljx20180807/p/12200503.html
时间: 2024-11-12 06:11:35