Unity3D Facebook APK没有处理场景变化

Question

当我启动游戏并点击使用Facebook登录时，我能够成功登录我的帐户，我的个人资料图片以及我的名字。 但是，当我点击播放并加载下一个场景时，我的个人资料图片没有更新，我的名字也没有。就好像我没有在第二场比赛中登录facebook。 我在场景二中的FBprofile和Name对象都被正确引用。 所以，我的问题是如何修改我的代码，以便它自动检测到我在场景2打开时登录到facebook。

using System.Collections;
using System.Collections.Generic;
using Facebook.Unity;
using UnityEngine.UI;
using UnityEngine;

public class FacebookScript : MonoBehaviour 
{    
    public GameObject facebookButton;
    public GameObject facebookUsername;
    public GameObject facebookAvitar;
    public GameObject facebookFrame;

    void Awake()
    {
        FB.Init (SetInit, OnHideUnity);
        DealWtihFBMenus (FB.IsLoggedIn);
    }
    void SetInit()
    {
        if (FB.IsLoggedIn) 
        {
            Debug.Log ("Logged in");
        } 
        else 
        {
            Debug.Log ("FB not logged in.");
        }
        DealWtihFBMenus (FB.IsLoggedIn);
    }   
    void OnHideUnity(bool isGameShown)
    {
        if (!isGameShown) 
        {
            Time.timeScale = 0;
        } 
        else 
        {
            Time.timeScale = 1;
        }
    }   
    public void FBlogin()
    {
        List<string> permissions = new List<string> ();
        permissions.Add ("public_profile");

        FB.LogInWithReadPermissions(permissions, AuthCallback);
    }
    void AuthCallback(IResult result)
    {
        if (result.Error != null) 
        {
            Debug.Log (result.Error);
        } 
        else 
        { 
            Debug.Log ("FB Not logged in(AuthCallback)");
        }
        DealWtihFBMenus (FB.IsLoggedIn);
    }
    void DealWtihFBMenus(bool isLoggedIn)
    {
        if (isLoggedIn) 
        {
            facebookButton.SetActive (false);

            FB.API ("/me?fields=first_name", HttpMethod.GET, DisplayUsername);
            FB.API ("/me/picture?type=square&height=128&width=128", HttpMethod.GET, DisplayProfilePic);
        }
        else
        {
            facebookButton.SetActive (true);
        }
    }
    void DisplayUsername(IResult result)
    {
        facebookUsername.SetActive (true);
        Text UserName = facebookUsername.GetComponent<Text> ();
        if (result.Error == null) 
        {
            UserName.text = "" + result.ResultDictionary ["first_name"];

        }
    }    
    void DisplayProfilePic(IGraphResult result)
    {
        if (result.Texture != null) 
        {
            facebookAvitar.SetActive (true);
            facebookFrame.SetActive (true);
            Image ProfilePic = facebookAvitar.GetComponent<Image> ();
            ProfilePic.sprite = Sprite.Create (result.Texture, new Rect (0, 0, 128, 128), new Vector2 ());
        }
    }
}