Flutter 錯誤：'BluetoothDevice' 類型的值？ 不能分配給“BluetoothDevice”類型的變量

Question

Flutter 錯誤：'BluetoothDevice' 類型的值？ 不能分配給“BluetoothDevice”類型的變量。 嘗試更改變量的類型，或將右側類型轉換為“BluetoothDevice”。

void initState() {
    super.initState();
    // Start scanning for devices
    flutterBlue.startScan(timeout: Duration(seconds: 4));
    // Listen for scan results
    flutterBlue.scanResults.listen((results) {
      // Find the heart rate device
      device = results.firstWhere((r) => r.device.name == 'Heart Rate',
                orElse: () => null)?.device;

      if (device != null) {
        flutterBlue.stopScan();
        connectToDevice();
      }
    });
  }

Answer 1

嘗試這個：

void initState() {
    super.initState();
    // Start scanning for devices
    flutterBlue.startScan(timeout: Duration(seconds: 4));
    // Listen for scan results
    flutterBlue.scanResults.listen((results) {
    if(results != null) {
       // Find the heart rate device
      device = results.firstWhere((r) => r.device.name == 'Heart Rate',
                orElse: () => null)!.device;

     }
      if (device != null) {
        flutterBlue.stopScan();
        connectToDevice();
      }
    });
  }