BLE获取广告包中编码的uuid

我正在尝试获取 ble 设备的 UUID。我遵循 Android 开发人员指南，到目前为止我只能获取设备名称和 RSSI。我试图获取扫描方法中设备的 Uuid，如下所示：

    public void onLeScan(final BluetoothDevice device, int rssi,byte[] scanRecord) {

        ParcelUuid[] myUUid =device.getUuids();
        for(ParcelUuid a :myUUid){
            Log.d("UUID",a.getUuid().toString());
        }
        String s = new String(scanRecord);
        int len = scanRecord.length;
        String scanRecords =new String(scanRecord) ;



        deviceMap.put(device.getName().toString(), rssi);
        Message msg = MainActivity.myHandler.obtainMessage();
        Bundle bundle = new Bundle();
        bundle.putCharSequence("dev_name", device.getName().toString());
        bundle.putCharSequence("rssi", Integer.toString(rssi));
        msg.setData(bundle);
        MainActivity.myHandler.sendMessage(msg);
   }

这将返回 - btif_gattc_upstreams_evt：事件 4096

如果您想获取 UUID/任何其他数据，例如BLE 扫描后，制造商数据超出 scanRec[] 字节，您首先需要了解这些广告数据包的数据格式。

Came from Bluetooth.org:

理论太多，想看一些代码片段吗？下面的这个函数将直接打印解析后的原始数据字节。现在，您需要知道每种类型代码才能知道哪些数据包引用了哪些信息。例如类型：0x09，指 BLE 设备名称，类型：0x07，指 UUID。

public void printScanRecord (byte[] scanRecord) {

    // Simply print all raw bytes   
    try {
        String decodedRecord = new String(scanRecord,"UTF-8");
        Log.d("DEBUG","decoded String : " + ByteArrayToString(scanRecord));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }

    // Parse data bytes into individual records
    List<AdRecord> records = AdRecord.parseScanRecord(scanRecord);


    // Print individual records 
    if (records.size() == 0) {
        Log.i("DEBUG", "Scan Record Empty");
    } else {
        Log.i("DEBUG", "Scan Record: " + TextUtils.join(",", records));
    }

}


public static String ByteArrayToString(byte[] ba)
{
  StringBuilder hex = new StringBuilder(ba.length * 2);
  for (byte b : ba)
    hex.append(b + " ");

  return hex.toString();
}


public static class AdRecord {

    public AdRecord(int length, int type, byte[] data) {
        String decodedRecord = "";
        try {
            decodedRecord = new String(data,"UTF-8");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        Log.d("DEBUG", "Length: " + length + " Type : " + type + " Data : " + ByteArrayToString(data));         
    }

    // ...

    public static List<AdRecord> parseScanRecord(byte[] scanRecord) {
        List<AdRecord> records = new ArrayList<AdRecord>();

        int index = 0;
        while (index < scanRecord.length) {
            int length = scanRecord[index++];
            //Done once we run out of records
            if (length == 0) break;

            int type = scanRecord[index];
            //Done if our record isn't a valid type
            if (type == 0) break;

            byte[] data = Arrays.copyOfRange(scanRecord, index+1, index+length);

            records.add(new AdRecord(length, type, data));
            //Advance
            index += length;
        }

        return records;
    }

    // ...
}

经过此解析后，这些数据字节将更有意义，您可以找出下一级解码。