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TelephonyManager tm = (TelephonyManager)   context.getSystemService(Context.TELEPHONY_SERVICE);

      String   deviceId =null,  androidId = null, mac= null, serial= null ;

      WifiManager   wifiMan = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

      try {

          if (PackageManager.PERMISSION_GRANTED ==   context.getPackageManager()

                  .checkPermission(Manifest.permission.READ_PHONE_STATE,

                          context.getPackageName()))   {

              deviceId   = tm.getDeviceId();

          }

          androidId   =    android.provider.Settings.Secure.getString(context.getContentResolver(),

                  android.provider.Settings.Secure.ANDROID_ID);

          mac=wifiMan.getConnectionInfo().getMacAddress();

          Class<!--?-->   c = Class.forName("android.os.SystemProperties");

          Method   get = c.getMethod("get", String.class, String.class );

          serial   = (String) get.invoke(c, "ro.serialno", "unknown" );

      } catch (Exception e) {

          e.printStackTrace();

      }

      if(TextUtils.isEmpty(deviceId   )&& TextUtils.isEmpty(androidId)

              &&TextUtils.isEmpty(mac)&&TextUtils.isEmpty(serial)){

          return UUID.randomUUID().toString();

      }

      UUID   deviceUuid = new UUID(androidId.hashCode(), deviceId .hashCode()|   mac.hashCode()|serial.hashCode());

      String   uniqueId = deviceUuid.toString();

      return uniqueId;