如何在Android设备上阅读UDID,Major,Minor of beacon？

Question

我正在尝试为Android开发BLE应用程序.

我可以通过哪种方式检测和读取Android设备上的信标的UDID,Major,Minor？

我已经阅读了RadiusNetworks android-ibeacon-service,但我无法理解为什么:

major = (256 * (0xFF & paramArrayOfByte[(i + 20)]) +
 (0xFF & paramArrayOfByte[(i + 21)]));

这paramArrayOfByte是LeScanCallback byte[] scanRecord

Answer 1

当你得到byte[] scanRecord从BluetoothAdapter.LeScanCallback,它将包括蓝牙LE头,它可以根据iBeacon显示的可变长.

由于可变长度头部,指示iBeacon广告(4c 00 02 15)的四个字节可以从第三个字节(scanRecord[2])到第六个字节()的任何地方开始scanRecord[5].在最新的代码中,Android的iBeacon显示图书馆发现的索引位置4c 00 02 15内scanRecord,并称其为startByte.其他所有东西都处于固定的位置startByte.

Answer 2

1. scanRecord应该被解析为AD结构列表.
2. iBeacon是一种AD结构.

使用nv-bluetooth,您可以像下面这样提取iBeacon.

public void onLeScan(BluetoothDevice device, int rssi, byte[] scanRecord)
{
    // Parse the payload of the advertising packet.
    List<ADStructure> structures =
        ADPayloadParser.getInstance().parse(scanRecord);

    // For each AD structure contained in the advertising packet.
    for (ADStructure structure : structures)
    {
        if (structure instanceof IBeacon)
        {
            // iBeacon was found.
            IBeacon iBeacon = (IBeacon)structure;

            // Proximity UUID, major number, minor number and power.
            UUID uuid = iBeacon.getUUID();
            int major = iBeacon.getMajor();
            int minor = iBeacon.getMinor();
            int power = iBeacon.getPower();

            ........

有关详细信息,请参阅" iBeacon作为一种AD结构 ".