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我一直在尝试在我的 kotlin 代码中添加“addonScrollListiner”，但它给了我一个空指针异常。我有一个片段，我在回收站视图中调用了 API 和填充数据。

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    mRootView = inflater.inflate(R.layout.fragment_notifications, container, false)
    (activity as DifsBaseActivity?)!!.activityComponent.inject(this)
    ButterKnife.bind(this, mRootView)
    mPresenterNotification?.attachView(this)

    mPresenterNotification?.getNotifications()
    sweetUIErrorHandler = SweetUIErrorHandler(activity, mRootView)
    setHasOptionsMenu(true)
    setToolbarTitle("Notifications")
    return mRootView
}

“getnotification”方法是从 api 获取数据。在“getnotification”的“onnext”方法中，我调用“displayNotifications”

override fun onNext(mResponse: Notifications?) {
                    mvpView!!.showProgressbar(false)
                    mvpView!!.displayNotifications(mResponse)
                }

这就是“displayNotifications”方法中发生的事情。

override fun displayNotifications(mObjResponse: Notifications?) {
    if (mObjResponse != null && mObjResponse.mListNotificaiton != null) {
        System.out.println("" + mObjResponse)
        if (mObjResponse.mListNotificaiton.size > 0) {
            hideOnErrorUI()
            mRvNotification.apply {
                mLayoutManager = LinearLayoutManager(activity);
                mLayoutManager!!.orientation = LinearLayoutManager.VERTICAL
                mRvNotification?.layoutManager = mLayoutManager
                mRvNotification?.setHasFixedSize(true)
                mAdapterNotification?.setGroups(mObjResponse.mListNotificaiton)
                mRvNotification.adapter = null;
                mRvNotification?.adapter = mAdapterNotification
                mAdapterNotification?.setItemClickListener { mView, position ->
                   if( mObjResponse.mListNotificaiton.get(position).objectType.trim().toLowerCase().equals("loan")){
                     //  mListener!!.loadLoan(4986, "Active")
                       mListener!!.loadGroup()


                   }else if(mObjResponse.mListNotificaiton.get(position).objectType.trim().toLowerCase().equals("client")){
                   //    mListener!!.loadClient( mObjResponse.mListNotificaiton.get(position).objectId, "Active")
                       mListener!!.loadGroup()


                   }


                }
            }
        } else {
            mRvNotification.adapter = null;
            showOnErrorUI()
        }
    } else {
        showOnErrorUI()
    }
}

我无法确定我应该使用哪个“addonScrollListiner”

mRvNotification.addOnScrollListener(object : EndlessRecyclerViewScrollListener(mLayoutManager) {
                           override fun onLoadMore(page: Int, totalItemsCount: Int) {

                           }
                       })
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