Android检测IBeacon热点的方法

IBeacon是BLE的一种，搜索iBeacon基站关键在于设备扫描到的scanRecord数组，识别是否有下面加粗斜体的02 15这两个数字。如果有，搜索到的蓝牙设备就是IBeacon。
// AirLocate:
// 02 01 1a 1a ff 4c 00 02 15 # Apple's fixed iBeacon advertising prefix
// e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 # iBeacon profile uuid
// 00 00 # major
// 00 00 # minor
// c5 # The 2's complement of the calibrated Tx Power

下面分步骤来实现检测IBeacon热点。

一、获得手机蓝牙控制权限

在manifest 文件中写上：

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

二、检测手机是否支持蓝牙，并获取mBluetoothAdapter 对象

if (!getPackageManager().hasSystemFeature(
        PackageManager.FEATURE_BLUETOOTH_LE))
    {
      Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT)
          .show();
      finish();
    }
    final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
    mBluetoothAdapter = bluetoothManager.getAdapter();

    if (mBluetoothAdapter == null)
    {
      Toast.makeText(this, R.string.error_bluetooth_not_supported,
          Toast.LENGTH_SHORT).show();
      finish();
      return;
    }

三、实现LeScanCallback回调接口

设备每次检测到一个蓝牙设备，就会回调这个接口中的onLeScan()方法，并且传入扫描到的device，rssi，scanRecord等参数。

private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback()
  {
    @Override
    public void onLeScan(final BluetoothDevice device, int rssi,
        byte[] scanRecord)
    {
      //在这里处理扫描到的参数
      //判断是不是IBeacon设备，做相应的处理。
    }
  };

四、处理扫描到的参数的方法

public class iBeaconClass
{

  static public class iBeacon
  {
    public String name;
    public int major;
    public int minor;
    public String proximityUuid;
    public String bluetoothAddress;
    public int txPower;
    public int rssi;
  }

  /**
   * 将扫描到的信息传入这个方法
   * 该方法会判断扫描到的设备是不是IBeacon
   * 如果是就返回一个IBeacon对象
   * 如果不是就返回null
   * @param device
   * @param rssi
   * @param scanData
   * @return
   */
  public static iBeacon fromScanData(BluetoothDevice device, int rssi,
      byte[] scanData)
  {

    int startByte = 2;
    boolean patternFound = false;
    while (startByte <= 5)
    {
      if (((int) scanData[startByte + 2] & 0xff) == 0x02
          && ((int) scanData[startByte + 3] & 0xff) == 0x15)
      {
        // yes! This is an iBeacon
        patternFound = true;
        break;
      } else if (((int) scanData[startByte] & 0xff) == 0x2d
          && ((int) scanData[startByte + 1] & 0xff) == 0x24
          && ((int) scanData[startByte + 2] & 0xff) == 0xbf
          && ((int) scanData[startByte + 3] & 0xff) == 0x16)
      {
        iBeacon iBeacon = new iBeacon();
        iBeacon.major = 0;
        iBeacon.minor = 0;
        iBeacon.proximityUuid = "00000000-0000-0000-0000-000000000000";
        iBeacon.txPower = -55;
        return iBeacon;
      } else if (((int) scanData[startByte] & 0xff) == 0xad
          && ((int) scanData[startByte + 1] & 0xff) == 0x77
          && ((int) scanData[startByte + 2] & 0xff) == 0x00
          && ((int) scanData[startByte + 3] & 0xff) == 0xc6)
      {

        iBeacon iBeacon = new iBeacon();
        iBeacon.major = 0;
        iBeacon.minor = 0;
        iBeacon.proximityUuid = "00000000-0000-0000-0000-000000000000";
        iBeacon.txPower = -55;
        return iBeacon;
      }
      startByte++;
    }

    if (patternFound == false)
    {
      // This is not an iBeacon
      return null;
    }

    iBeacon iBeacon = new iBeacon();

    iBeacon.major = (scanData[startByte + 20] & 0xff) * 0x100
        + (scanData[startByte + 21] & 0xff);
    iBeacon.minor = (scanData[startByte + 22] & 0xff) * 0x100
        + (scanData[startByte + 23] & 0xff);
    iBeacon.txPower = (int) scanData[startByte + 24]; // this one is signed
    iBeacon.rssi = rssi;

    // AirLocate:
    // 02 01 1a 1a ff 4c 00 02 15 # Apple's fixed iBeacon advertising prefix
    // e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0 # iBeacon profile
    // uuid
    // 00 00 # major
    // 00 00 # minor
    // c5 # The 2's complement of the calibrated Tx Power

    // Estimote:
    // 02 01 1a 11 07 2d 24 bf 16
    // 394b31ba3f486415ab376e5c0f09457374696d6f7465426561636f6e00000000000000000000000000000000000000000000000000

    byte[] proximityUuidBytes = new byte[16];
    System.arraycopy(scanData, startByte + 4, proximityUuidBytes, 0, 16);
    String hexString = bytesToHexString(proximityUuidBytes);
    StringBuilder sb = new StringBuilder();
    sb.append(hexString.substring(0, 8));
    sb.append("-");
    sb.append(hexString.substring(8, 12));
    sb.append("-");
    sb.append(hexString.substring(12, 16));
    sb.append("-");
    sb.append(hexString.substring(16, 20));
    sb.append("-");
    sb.append(hexString.substring(20, 32));
    iBeacon.proximityUuid = sb.toString();

    if (device != null)
    {
      iBeacon.bluetoothAddress = device.getAddress();
      iBeacon.name = device.getName();
    }

    return iBeacon;
  }

  private static String bytesToHexString(byte[] src)
  {
    StringBuilder stringBuilder = new StringBuilder("");
    if (src == null || src.length <= 0)
    {
      return null;
    }
    for (int i = 0; i < src.length; i++)
    {
      int v = src[i] & 0xFF;
      String hv = Integer.toHexString(v);
      if (hv.length() < 2)
      {
        stringBuilder.append(0);
      }
      stringBuilder.append(hv);
    }
    return stringBuilder.toString();
  }
}

五、开启蓝牙

mBluetoothAdapter.enable();

六、开始扫描

mBluetoothAdapter.startLeScan(mLeScanCallback);

代码改自链接地址

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