Method of detecting IBeacon hot spot by Android

IBeacon is a kind of BLE. The key to searching iBeacon base station lies in the scanRecord array scanned by the equipment, and identifies whether there are two numbers 02 15 in bold italics below. If so, the searched Bluetooth device is 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

The following steps are taken to detect IBeacon hotspots.

1. Get Bluetooth control rights for mobile phones

Write in the manifest file:

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

2. Detect whether the mobile phone supports Bluetooth and obtain mBluetoothAdapter object

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;
    }

3. Implement the LeScanCallback callback interface

Every time a device detects a Bluetooth device, it will call back the onLeScan () method in this interface and pass in the scanned device, rssi, scanRecord and other parameters.

private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback()
  {
    @Override
    public void onLeScan(final BluetoothDevice device, int rssi,
        byte[] scanRecord)
    {
      // Process the scanned parameters here 
      // Judge whether it is IBeacon Equipment, do the corresponding treatment. 
    }
  };

4. How to process the scanned parameters

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;
  }


  /**
   *  Pass the scanned information into this method 
   *  This method will determine whether the scanned device is IBeacon
   *  If yes, return 1 A IBeacon Object 
   *  If not, return 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();
  }
}

Step 5 Turn on Bluetooth

mBluetoothAdapter.enable();

Step 6 Start scanning

mBluetoothAdapter.startLeScan(mLeScanCallback);

Code changed from link address