startScan method

@override Future<void> startScan({ List<String> serviceUuids = const <String>[], Duration? timeout, bool allowDuplicates = false, BluetoothScanMode scanMode = BluetoothScanMode.ble, })

实现 FlutterBluetoothPluginPlatform.startScan。

Web 会打开设备选择器并返回用户选中的单个 BLE 设备；不是被动扫描。

Implementation

@override
Future<void> startScan({
  List<String> serviceUuids = const <String>[],
  Duration? timeout,
  bool allowDuplicates = false,
  BluetoothScanMode scanMode = BluetoothScanMode.ble,
}) async {
  if (scanMode == BluetoothScanMode.classic) {
    throw UnsupportedError('Web Bluetooth supports BLE devices only.');
  }

  final bluetooth = _requireBluetooth();
  final state = await getAdapterState();
  if (state == BluetoothAdapterState.poweredOff) {
    throw StateError(
        'Bluetooth is not available or powered on in the browser.');
  }

  _isSelectingDevice = true;
  try {
    final device = await bluetooth
        .requestDevice(_requestDeviceOptions(serviceUuids))
        .toDart;
    _rememberDevice(device);
    _scanResultsController.add(
      BluetoothScanResult(
        device: _deviceFromWeb(device),
        rssi: 0,
        localName: device.name,
        serviceUuids: serviceUuids,
        raw: <String, dynamic>{
          'platform': 'web',
          'chooserResult': true,
          'allowDuplicatesIgnored': allowDuplicates,
          'timeoutIgnored': timeout != null,
          'scanMode': scanMode.name,
        },
      ),
    );
  } finally {
    _isSelectingDevice = false;
  }
}