Android Application类不保存对象的实例

时间:2013-03-25 15:18:06

标签: android

我有一个名为AppVariable的类,它扩展了Application类

这是我的AppVariable#OnCreate()方法,以及我想要检索的对象的getter和setter:

public void onCreate() {
    super.onCreate();
    //set Facebook Manager
    setFacebookManager(new FacebookManager(this));
}

/**
 * Getter for FacebookManager Object
 * @return the FacebookConnectionManager object
 */
public FacebookManager getFacebookManager() {                           
    return this.facebookManager;
}

/**
 * Setter for FacebookManager object
 * @param facebookManager the new FacebookConnectionManager object
 */
public void setFacebookManager(FacebookManager facebookManager) {
    this.facebookManager = facebookManager;
}

在我的Activity里面我试图从AppVariable对象中获取FacebookManager对象 - 但它总是返回null:

    /**
     * Authorize with facebook
     */
    public void facebookAuthorization()
    {
        AppVaiable app = (AppVariables) getApplication();

           //Connecting with Facebook
        loadingStatus.setText("Connecting with Facebook");
        //authorize to Facebook             
        app.getFacebookManager().getFacebook().authorize(this, getResources().getStringArray(R.array.facebookPermissions), new AuthorizeDialogListener(app));       
    }

任何想法为什么?

1 个答案:

答案 0 :(得分:0)

你确定你的nullpointer出现在“app.getFacebookManager()”。我建议您打印所有方法结果,并查看null的来源:

  Log.d("YourClass", "Manager: "+ app.getFacebookManager());
  Log.d("YourClass", "FAcebook: "+ app.getFacebookManager().getFacebook());