code: public void checkSignIn(final SignInHandler handler){
          HMSAgentLog.i("checkSignIn:handler=" + StrUtils.objDesc(handler));
  
          if (this.handler != null) {
              HMSAgentLog.e("has already a signIn to dispose");
              new Handler(Looper.getMainLooper()).post(new CallbackResultRunnable<SignInHuaweiId>(handler, HMSAgent.AgentResultCode.REQUEST_REPEATED, null));
              return;
          }
  
          this.handler = handler;
          retryTimes = MAX_RETRY_TIMES;
          connect();
      }
docs: 帐号登录请求,非强制登录
  @param handler 登录结果回调