code: public void saveResumeToken(String token) {
          SharedPreferences settings = mContext.getSharedPreferences(PREF_DDPINFO, Context.MODE_PRIVATE);
          SharedPreferences.Editor editor = settings.edit();
          //REVIEW: should token be encrypted?
          editor.putString(PREF_RESUMETOKEN, token);
          editor.apply();
      }
docs: Saves resume token to Android's internal app storage
  @param token resume token