监控非信标 BLE 设备（Android 信标库）

Question

使用Android Beacon Library，是否可以监控非Beacon BLE 设备？如果是，我如何在没有 txPower 的情况下使用 rssi 估计他们的距离？

Answer 1

是的，可以使用库检测非信标 BLE 设备。如果您首先在一米处测量设备的已知 RSSI，您还可以计算到设备的估计距离。

下面的代码展示了如何做到这一点：

    final DistanceCalculator distanceCalculator = new ModelSpecificDistanceCalculator(this, null);
    final int rssiAtOneMeter = -59;

    mBeaconManager.setNonBeaconLeScanCallback(new NonBeaconLeScanCallback() {
        @Override
        public void onNonBeaconLeScan(BluetoothDevice bluetoothDevice, int rssi, byte[] bytes) {
            Double estimatedDistnaceInMeters = distanceCalculator.calculateDistance(rssiAtOneMeter, rssi);
            // TODO: do something with estimatedDistanceInMeters
        }
    });