code: public static DropboxClient build(String appKey, String appSecret, Token accessToken) {
          Preconditions.checkNotNull(accessToken, "Access token cannot be null");
  
          DropboxClientBuilder builder = new DropboxClientBuilder(appKey, appSecret);
          builder.accessToken = accessToken;
  
          return builder.buildDropboxClient();
      }
docs: Build ready to use DropboxClient with specified appKey and appSecret
  with specified access token (without authenticator).
  
  @param appKey      application key
  @param appSecret   application secret
  @param accessToken access token
  
  @return ready to use dropbox client
  
  @see DropboxClient