BluetoothDevice.getName（）为null

Question

我使用以下接收器来获取周围的蓝牙设备：

// Create a BroadcastReceiver for ACTION_FOUND.
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            // Discovery has found a device. Get the BluetoothDevice
            // object and its info from the Intent.
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            String deviceName = device.getName();
            String deviceHardwareAddress = device.getAddress(); // MAC address
            Log.d(TAG, "Device hardware adress : " + deviceHardwareAddress);

            if (deviceName != null){
                Log.d(TAG, "Device name : " + deviceName);
                if (deviceName.contains("GYDE")){
                    Log.d(TAG, "Stooping discovery : " + deviceName);

                    // Don't forget to unregister the ACTION_FOUND receiver.
                    unregisterReceiver(mReceiver);
                }
            }

        }
    }
};

我在该地区有2个蓝牙设备。我看到他们的MAC地址，但他们没有名字。我相信虽然他们有名字，因为：

1）昨天测试时我可以看到它（从那时起没有任何修改）

2）启用蓝牙后，我的手机可以列出他们的名字

3）我实际上可以看到我的电话名称