public static String[] longToString(Long longArray[]) {
         if (longArray == null || longArray.length < 1) {
             return null;
         }
         String  stringArray[] = new String[longArray.length];
         for (int i = 0; i < stringArray.length; i++ ) {
             try {
              stringArray[i] = String.valueOf(longArray[i]);
             } catch (NumberFormatException e) {
              stringArray[i] = null;
                 continue;
             }
         }
         return stringArray;
     }