swift - Flutter 中的 BLE 支持

Question

有什么方法可以通过 dart 代码检查我的设备是否支持 BLE？我正在寻找类似的东西。

switch ([_manager state])
{
case CBCentralManagerStateUnsupported:
    state = @"This device does not support Bluetooth Low Energy.";
    break;
case CBCentralManagerStateUnauthorized:
    state = @"This app is not authorized to use Bluetooth Low Energy.";
    break;
case CBCentralManagerStatePoweredOff:
    state = @"Bluetooth on this device is currently powered off.";
    break;
case CBCentralManagerStateResetting:
    state = @"The BLE Manager is resetting; a state update is pending.";
    break;
case CBCentralManagerStatePoweredOn:
    state = @"Bluetooth LE is turned on and ready for communication.";
    break;
case CBCentralManagerStateUnknown:
    state = @"The state of the BLE Manager is unknown.";
    break;
default:
    state = @"The state of the BLE Manager is unknown.";

}

Answer 1

我知道这是一个旧线程，无论如何都要更新它，因为它可能对其他人有帮助。

您可以尝试使用 FlutterBlue 蓝牙插件，这是 Flutter 推出的新 SDK。

FlutterBlue 旨在充分利用两个平台(iOS 和 Android)。FlutterBlue 应该适用于 Android 和 IOS 平台。该插件还应该有助于扫描和连接附近的设备。这是文档中的示例:[https://github.com/pauldemarco/flutter_blue#obtain-an-instance][1]

获取实例:

FlutterBlue flutterBlue = FlutterBlue.instance;

isAvailable属性检查设备是否支持蓝牙

Future<bool> get isAvailable =>
    _channel.invokeMethod('isAvailable').then<bool>((d) => d);

isOn 属性检查蓝牙功能是否打开:

Future<bool> get isOn => _channel.invokeMethod('isOn').then<bool>((d) => d);

扫描设备:[ https://github.com/pauldemarco/flutter_blue#scan-for-devices][2]

//开始扫描

flutterBlue.startScan(timeout: Duration(seconds: 4));

// Listen to scan results
var subscription = flutterBlue.scanResults.listen((scanResult) {
    // do something with scan result
    device = scanResult.device;
    print('${device.name} found! rssi: ${scanResult.rssi}');
});

// Stop scanning
flutterBlue.stopScan();

连接/断开设备

https://github.com/pauldemarco/flutter_blue#connect-to-a-device
// Connect to the device
await device.connect();
// Disconnect from device
device.disconnect();
Discover services:
https://github.com/pauldemarco/flutter_blue#discover-services
List<BluetoothService> services = await device.discoverServices();
services.forEach((service) {
    // do something with service
});

您可以使用 ScanMode.lowLatency 扫描低能耗设备:

Stream<ScanResult> scan({
 ScanMode scanMode = ScanMode.lowLatency,
 List<Guid> withServices = const [],
 List<Guid> withDevices = const [],
 Duration timeout,
}) async* {
 var settings = protos.ScanSettings.create()
   ..androidScanMode = scanMode.value
   ..serviceUuids.addAll(withServices.map((g) => g.toString()).toList());

 if (_isScanning.value == true) {
   throw Exception('Another scan is already in progress.');
 }
....

您还可以在 FlutterBlue 的帮助下读取、写入字符和描述符或执行其他操作。希望有帮助。

  [1]: https://github.com/pauldemarco/flutter_blue#obtain-an-instance
  [2]: https://github.com/pauldemarco/flutter_blue#scan-for-devices