Flutter蓝牙连接插件walure_ios_bluetoothconnector的使用
Flutter蓝牙连接插件walure_ios_bluetoothconnector的使用
简介
walure_ios_bluetoothconnector
是一个用于在 Flutter 应用中进行蓝牙连接的插件。通过这个插件,开发者可以轻松地扫描、连接、断开和打印图像到蓝牙设备。
安装
首先,在你的 Flutter 项目的 pubspec.yaml
文件中添加该插件:
dependencies:
iosbluetoothconnector: ^版本号
然后运行以下命令以安装插件:
flutter pub get
使用示例
以下是一个完整的示例代码,展示了如何使用 walure_ios_bluetoothconnector
插件进行蓝牙连接。
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:iosbluetoothconnector/iosbluetoothconnector.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _platformVersion = 'Unknown';
final _iosbluetoothconnectorPlugin = Iosbluetoothconnector();
List<dynamic> bluetoothList = [];
List connectedBluetoothList = [];
bool isConnected = false;
[@override](/user/override)
void initState() {
WidgetsFlutterBinding.ensureInitialized();
super.initState();
getUpdatedList();
Timer.periodic(const Duration(seconds: 5), (Timer t) => getUpdatedList());
initPlatformState();
}
// 平台消息异步执行,因此我们在异步方法中初始化
Future<void> initPlatformState() async {
String platformVersion;
// 平台消息可能失败,所以我们使用 PlatformException 进行处理。
// 我们还处理消息可能返回空的情况。
try {
platformVersion =
await _iosbluetoothconnectorPlugin.getPlatformVersion() ??
'Unknown platform version';
} on PlatformException {
platformVersion = 'Failed to get platform version.';
}
// 如果小部件在异步平台消息还在飞行时从树中移除,我们希望丢弃回复而不是调用
// setState 来更新我们的不存在的外观。
if (!mounted) return;
setState(() {
_platformVersion = platformVersion;
});
}
getUpdatedList() async {
var res = await _iosbluetoothconnectorPlugin.getUpdatedDevices();
setState(() {
bluetoothList = res!;
});
}
TextEditingController userInputController = TextEditingController();
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('蓝牙连接插件示例应用'),
),
body: SingleChildScrollView(
child: Column(
children: [
Center(
child: Text('运行于: $_platformVersion\n'),
),
InkWell(
onTap: () async {
var res = await _iosbluetoothconnectorPlugin.scanBluetooth();
print("开始扫描蓝牙设备... $res");
// 列表中包含的设备...
},
child: Container(
height: 100,
width: 200,
decoration: const BoxDecoration(color: Colors.blue),
child: const Text('扫描蓝牙'),
),
),
const SizedBox(height: 20),
// 列表
Container(
height: 150,
child: ListView.builder(
itemCount: bluetoothList.length,
itemBuilder: (cxt, i) {
print(bluetoothList[i]);
String deviceId = bluetoothList[i][0];
bool isConnected = connectedBluetoothList.contains(deviceId);
return Column(
children: [
Container(
height: 40,
width: 300,
decoration: BoxDecoration(
color: Colors.teal,
borderRadius: BorderRadius.circular(12),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
bluetoothList[i][1].toString(),
style: const TextStyle(color: Colors.white),
),
InkWell(
onTap: () async {
var res = await _iosbluetoothconnectorPlugin.connect(bluetoothList[i][0]);
print(bluetoothList[i][0]);
print("尝试连接? $res");
if (res == "Connected") {
setState(() {
connectedBluetoothList.add(bluetoothList[i][0]);
});
print("$res");
}
},
child: !isConnected
? const Text(
"连接",
style: TextStyle(color: Colors.white),
)
: InkWell(
onTap: () async {
var res = await _iosbluetoothconnectorPlugin.disconnect();
print("我想断开蓝牙连接...");
if (res == "Disconnected") {
setState(() {
connectedBluetoothList.remove(bluetoothList[i][0]);
});
print(res);
}
},
child: const Text(
"断开连接",
style: TextStyle(color: Colors.white),
),
),
),
],
)),
const SizedBox(height: 10),
],
);
}),
),
InkWell(
onTap: () {
_iosbluetoothconnectorPlugin.printImage('w.sks');
print("开始打印图像...");
},
child: Container(
height: 100,
width: 200,
decoration: BoxDecoration(
color: Colors.green,
borderRadius: BorderRadius.circular(12)),
child: const Text('打印图像'),
),
),
Container(
height: 50,
width: 300,
child: TextFormField(
controller: userInputController,
)),
InkWell(
onTap: () {
_iosbluetoothconnectorPlugin.printLine(userInputController.text);
print("开始打印...");
},
child: Container(
height: 100,
width: 200,
decoration: BoxDecoration(
color: Colors.purple,
borderRadius: BorderRadius.circular(12)),
child: const Text('打印文本'),
),
),
const SizedBox(height: 20),
InkWell(
onTap: () {
_iosbluetoothconnectorPlugin.stopScanning();
print("停止扫描...");
},
child: Container(
height: 100,
width: 200,
decoration: BoxDecoration(
color: Colors.red,
borderRadius: BorderRadius.circular(12)),
child: const Text('停止扫描'),
),
),
],
),
),
),
);
}
}
更多关于Flutter蓝牙连接插件walure_ios_bluetoothconnector的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter蓝牙连接插件walure_ios_bluetoothconnector的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,下面是一个关于如何使用Flutter蓝牙连接插件walure_ios_bluetoothconnector
的示例代码。请注意,这个插件是专门为iOS设备设计的,因此代码示例也将基于iOS平台。
首先,确保你已经在pubspec.yaml
文件中添加了该插件的依赖:
dependencies:
flutter:
sdk: flutter
walure_ios_bluetoothconnector: ^最新版本号 # 请替换为实际最新版本号
然后,运行flutter pub get
来安装依赖。
接下来,你可以在你的Flutter应用中这样使用walure_ios_bluetoothconnector
插件:
import 'package:flutter/material.dart';
import 'package:walure_ios_bluetoothconnector/walure_ios_bluetoothconnector.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late BluetoothConnector _bluetoothConnector;
List<CBCentralManagerState> _states = CBCentralManagerState.values;
List<CBPeripheral> _discoveredDevices = [];
@override
void initState() {
super.initState();
_bluetoothConnector = BluetoothConnector();
_bluetoothConnector.centralManagerStateStream.listen((state) {
setState(() {
print("Central Manager State: ${describeEnum(state)}");
});
});
// 开始扫描设备
_bluetoothConnector.startScanningForDevices().then((_) {
_bluetoothConnector.discoveredDevicesStream.listen((devices) {
setState(() {
_discoveredDevices = devices;
});
});
});
}
@override
void dispose() {
_bluetoothConnector.stopScanningForDevices();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Bluetooth Example'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
Text('Central Manager State: ${_states.firstWhere((state) => state == _bluetoothConnector.state, orElse: () => CBCentralManagerState.unknown)}'),
SizedBox(height: 20),
Expanded(
child: ListView.builder(
itemCount: _discoveredDevices.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(_discoveredDevices[index].name ?? 'Unknown Device'),
subtitle: Text(_discoveredDevices[index].identifier.uuidString),
onTap: () {
// 连接设备
_bluetoothConnector.connectToDevice(_discoveredDevices[index]).then((connected) {
if (connected) {
print("Connected to device: ${_discoveredDevices[index].name}");
// 这里可以添加连接成功后的逻辑
} else {
print("Failed to connect to device: ${_discoveredDevices[index].name}");
}
});
},
);
},
),
),
],
),
),
),
);
}
}
String describeEnum(CBCentralManagerState state) {
switch (state) {
case CBCentralManagerState.unknown:
return 'Unknown';
case CBCentralManagerState.resetting:
return 'Resetting';
case CBCentralManagerState.unsupported:
return 'Unsupported';
case CBCentralManagerState.unauthorized:
return 'Unauthorized';
case CBCentralManagerState.poweredOff:
return 'Powered Off';
case CBCentralManagerState.poweredOn:
return 'Powered On';
}
}
在这个示例中,我们做了以下几件事:
- 初始化
BluetoothConnector
实例。 - 监听
centralManagerStateStream
流以获取蓝牙管理器的状态。 - 开始扫描设备,并监听
discoveredDevicesStream
流以获取发现的设备列表。 - 在UI中显示蓝牙管理器的状态和发现的设备列表。
- 点击设备列表项时尝试连接到该设备。
请注意,这个示例仅展示了如何使用walure_ios_bluetoothconnector
插件进行基本的蓝牙设备扫描和连接。实际应用中,你可能需要处理更多的蓝牙通信细节,如服务发现、特征值读写等。此外,由于该插件是专门为iOS设计的,因此在Android平台上运行时可能会遇到问题。如果你需要在Android平台上使用蓝牙功能,请考虑使用其他跨平台的蓝牙插件,如flutter_blue
。