code: public JsonReader createReader(InputStream input) {
          try {
              return createReader(new InputStreamReader(input, "UTF-8"));
          }
          catch (UnsupportedEncodingException e) {
              throw new RuntimeException(e);
          }
      }
docs: Create a JsonReader by providing an InputStream.
  
  @param input The InputStream object.
  @return JsonReader object.