Question

我无法在Lollipop之前的设备上获得UUID iBeacon，但是我的代码低于Marshmallow Nexus 5x。

我不想使用像AltBeacon或相关的任何库。

BluetoothManager bm = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter mBluetoothAdapter = bm.getAdapter();
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
    //Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    //startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
} else {
    BluetoothLeScanner scanner = mBluetoothAdapter.getBluetoothLeScanner();
    // scan for devices
    scanner.startScan(new ScanCallback() {
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            // get the discovered device as you wish
            // this will trigger each time a new device is found
            BluetoothDevice device = result.getDevice();
            if (device.getType() == BluetoothDevice.DEVICE_TYPE_LE) { //int the device type DEVICE_TYPE_CLASSIC, DEVICE_TYPE_LE DEVICE_TYPE_DUAL. DEVICE_TYPE_UNKNOWN if it's not available
                if (device.fetchUuidsWithSdp()) {
                    System.out.println(device.getName());
                    List<ParcelUuid> uuids = result.getScanRecord().getServiceUuids();
                    System.out.println(uuids);
                    System.out.println(getMajor(result.getScanRecord().getBytes()));
                    System.out.println(getMinor(result.getScanRecord().getBytes()));
                } else {
                    System.out.println("failed");
                }
            }
        }
    });
}

Answer 1

CollectionViewSource

Answer 2

public void onLeScan(BluetoothDevice device, int rssi, final byte[] scanRecord) {
       int startByte = 2;
       boolean patternFound = false;
       while (startByte <= 5) {
           if (    ((int) scanRecord[startByte + 2] & 0xff) == 0x02 && //Identifies an iBeacon
                   ((int) scanRecord[startByte + 3] & 0xff) == 0x15) { //Identifies correct data length
               patternFound = true;
               break;
           }
           startByte++;
       }

       if (patternFound) {
           //Convert to hex String
           byte[] uuidBytes = new byte[16];
           System.arraycopy(scanRecord, startByte+4, uuidBytes, 0, 16);
           String hexString = bytesToHex(uuidBytes);

           //Here is your UUID
           String uuid =  hexString.substring(0,8) + "-" +
                   hexString.substring(8,12) + "-" +
                   hexString.substring(12,16) + "-" +
                   hexString.substring(16,20) + "-" +
                   hexString.substring(20,32);

           //Here is your Major value
           int major = (scanRecord[startByte+20] & 0xff) * 0x100 + (scanRecord[startByte+21] & 0xff);

           //Here is your Minor value
           int minor = (scanRecord[startByte+22] & 0xff) * 0x100 + (scanRecord[startByte+23] & 0xff);

           System.out.println(String.format("%s\n%s\n%s",uuid,major,minor));
           textView.setText(String.format("%s\n%s\n%s", uuid,major,minor));
       }
   }

   /**
    * bytesToHex method
    * Found on the internet
    * http://stackoverflow.com/a/9855338
    */
   static final char[] hexArray = "0123456789ABCDEF".toCharArray();
   private static String bytesToHex(byte[] bytes) {
       char[] hexChars = new char[bytes.length * 2];
       for ( int j = 0; j < bytes.length; j++ ) {
           int v = bytes[j] & 0xFF;
           hexChars[j * 2] = hexArray[v >>> 4];
           hexChars[j * 2 + 1] = hexArray[v & 0x0F];
       }
       return new String(hexChars);
   }

调用这样的方法并享受:) onLeScan（设备，result.getRssi（），result.getScanRecord（）的getBytes（））;

无法在Lollipop前设备上获得iBeacon的UUID

2 个答案: