java - 低功耗蓝牙扫描仪似乎工作正常，但找不到任何设备

Question

我在低功耗蓝牙方面遇到问题。一切似乎都运行良好。

Logger显示:onClientRegistered() - status=0 clientIf=7 mClientIf=0，表示状态为成功，clientif=6指的是客户端接口(interface)。

所以扫描仪工作正常。问题是它找不到任何设备。

我在 list 中拥有 BLUETOOTH、BLUETOOTH_ADMIN、ACCESS_COARSE_LOCATION 权限。我在应用程序启动时检查它们。每个遇到“无扫描结果”问题的人都会收到有关启用位置的回复。我做到了，但仍然一无所获。

onScanResults 永远不会成功。

我使用的是 Android 7.0.0。

class MainActivity : AppCompatActivity(), AnkoLogger {

    lateinit var bleManager: BluetoothManager
    lateinit var bleAdapter: BluetoothAdapter
    lateinit var bleScanner: BluetoothLeScanner

    val REQUEST_BLUETOOTH = 0
    val REQUEST_COARSE_LOCATION = 1

    val ui by lazy { MainUI() }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        ui.setContentView(this)

        checkLocationPerm()

        bleManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
        bleAdapter = bleManager.adapter
        bleScanner = bleAdapter.bluetoothLeScanner

        checkEnableBluetooth()

        ui.scanButton.onClick {
            startScan()
        }
    }


    fun checkLocationPerm() {
        val perm = PermissionChecker.checkSelfPermission(applicationContext, Manifest.permission.ACCESS_COARSE_LOCATION)
        if (perm == PermissionChecker.PERMISSION_GRANTED) {
            info("Location permission granted")
        } else requestEnableLocation()
    }

    fun requestEnableLocation() = requestPermissions(arrayOf(Manifest.permission.ACCESS_COARSE_LOCATION),
            REQUEST_COARSE_LOCATION)

    fun checkEnableBluetooth() {
        if (!bleAdapter.isEnabled) {
            val enableBtIntent = Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE)
            startActivityForResult(enableBtIntent, REQUEST_BLUETOOTH)
            info("Requested user to enable bluetooth.")
        }
    }

    fun startScan() {
        var scanResults = mutableMapOf<String?, BluetoothDevice?>()
        var bleScanCallback = BleScanCallback(scanResults)
        bleScanner.startScan(bleScanCallback)
    }


    class BleScanCallback(resultMap: MutableMap<String?, BluetoothDevice?>) : ScanCallback(), AnkoLogger {

        var resultOfScan = resultMap

        override fun onScanResult(callbackType: Int, result: ScanResult?) {
            addScanResult(result)
            info("I found a ble device ${result?.device?.address}")

        }

        override fun onBatchScanResults(results: MutableList<ScanResult>?) {
            info("I found a device!")
        }

        override fun onScanFailed(errorCode: Int) {
            info("Bluetooth LE scan failed. Error code: $errorCode")
        }

        fun addScanResult(scanResult: ScanResult?) {
            val bleDevice = scanResult?.device
            val deviceAddress = bleDevice?.address
            resultOfScan.put(deviceAddress, bleDevice)
        }
    }
}

我只想记录蓝牙设备的地址。我检查了 BleScanCallback 对象，一切正常。我不知道我的代码有什么问题。

Answer 1

事实证明，支持蓝牙低功耗的手机是不可见的。当我在其中一台手机上模拟 GATT 服务器时，我的应用程序发现了这部手机。