正确设置LifecycleOwner，就像Presenter中liveData.observe方法中的第一个参数一样

Question

我的演示者中有这个方法：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Data;


namespace ConsoleApplication19
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        static void Main(string[] args)
        {
            XDocument doc = XDocument.Load(FILENAME);
            XNamespace ns = doc.Root.GetDefaultNamespace();

            DataTable dt = new DataTable();
            dt.Columns.Add("FileId", typeof(string));
            dt.Columns.Add("FileCreateDateTime", typeof(DateTime));
            dt.Columns.Add("StateCd", typeof(string));
            dt.Columns.Add("CoverageYear", typeof(int));
            dt.Columns.Add("PayeeId", typeof(string));
            dt.Columns.Add("StateTPID", typeof(string));
            dt.Columns.Add("IssuerId", typeof(string));

            dt.Columns.Add("OriginalSBMIFileId", typeof(string));
            dt.Columns.Add("OriginalSBMIExtractDateTime", typeof(DateTime));
            dt.Columns.Add("CMSPolicyVersionDateTime", typeof(DateTime));
            dt.Columns.Add("QHPId", typeof(string));
            dt.Columns.Add("ExchangeAssignedPolicyId", typeof(string));
            dt.Columns.Add("ExchangeAssignedSubscriberId", typeof(string));
            dt.Columns.Add("PolicyStartDate", typeof(DateTime));
            dt.Columns.Add("PolicyEndDate", typeof(DateTime));
            dt.Columns.Add("EffectuationInd", typeof(string));
            dt.Columns.Add("InsuranceLineCode", typeof(string));

            dt.Columns.Add("ExchangeAssignedMemberId", typeof(string));
            dt.Columns.Add("SubscriberIndicator", typeof(string));
            dt.Columns.Add("MemberLastName", typeof(string));
            dt.Columns.Add("MemberFirstName", typeof(string));
            dt.Columns.Add("BirthDate", typeof(DateTime));
            dt.Columns.Add("SocialSecurityNumber", typeof(string));
            dt.Columns.Add("PostalCode", typeof(string));
            dt.Columns.Add("LanguageQualifierCode", typeof(string));
            dt.Columns.Add("LanguageCode", typeof(string));
            dt.Columns.Add("GenderCode", typeof(string));
            dt.Columns.Add("TobaccoUseCode", typeof(string));

            dt.Columns.Add("FinancialEffectiveStartDate", typeof(DateTime));
            dt.Columns.Add("FinancialEffectiveEndDate", typeof(DateTime));
            dt.Columns.Add("MonthlyTotalPremiumAmount", typeof(decimal));
            dt.Columns.Add("MonthlyTotalIndividualResponsibilityAmount", typeof(decimal));
            dt.Columns.Add("MonthlyAPTCAmount", typeof(decimal));
            dt.Columns.Add("MonthlyCSRAmount", typeof(decimal));
            dt.Columns.Add("CSRVariantId", typeof(string));
            dt.Columns.Add("RatingArea", typeof(string));

            XElement fileInfo = doc.Descendants(ns + "FileInformation").FirstOrDefault();

            string fileId = (string)fileInfo.Element(ns + "FileId");
            DateTime fileCreateDate = (DateTime)fileInfo.Element(ns + "FileCreateDateTime");
            string stateCd = (string)fileInfo.Element(ns + "StateCd");
            int coverageYear = (int)fileInfo.Element(ns + "CoverageYear");
            string payeeId = (string)fileInfo.Element(ns + "PayeeId");
            string stateID = (string)fileInfo.Element(ns + "StateTPID");
            string issueID = (string)fileInfo.Element(ns + "IssuerId");

            XElement policy = doc.Descendants(ns + "Policy").FirstOrDefault();


            string originalFileId = (string)policy.Element(ns + "OriginalSBMIFileId");
            DateTime originalExactDate = (DateTime)policy.Element(ns + "OriginalSBMIExtractDateTime");
            string policyVersion = (string)policy.Element(ns + "CMSPolicyVersionDateTime");
            string qhpId = (string)policy.Element(ns + "QHPId");
            string assignedPolicyId = (string)policy.Element(ns + "ExchangeAssignedPolicyId");
            string exchangeSubscriberId = (string)policy.Element(ns + "ExchangeAssignedSubscriberId");
            DateTime policyStartDate = (DateTime)policy.Element(ns + "PolicyStartDate");
            DateTime policyEndDate = (DateTime)policy.Element(ns + "PolicyEndDate");
            string effectuationInd = (string)policy.Element(ns + "EffectuationInd");
            string insuranceLineCode = (string)policy.Element(ns + "InsuranceLineCode");

            XElement financialInformation = policy.Element(ns + "FinancialInformation");

            DateTime financialEffectiveStartDate = (DateTime)financialInformation.Element(ns + "FinancialEffectiveStartDate");
            DateTime financialEffectiveEndDate = (DateTime)financialInformation.Element(ns + "FinancialEffectiveEndDate");
            decimal monthlyTotalPremiumAmount = (decimal)financialInformation.Element(ns + "MonthlyTotalPremiumAmount");
            decimal monthlyTotalIndividualResponsibilityAmount = (decimal)financialInformation.Element(ns + "MonthlyTotalIndividualResponsibilityAmount");
            decimal monthlyAPTCAmount = (decimal)financialInformation.Element(ns + "MonthlyAPTCAmount");
            decimal monthlyCSRAmount = (decimal)financialInformation.Element(ns + "MonthlyCSRAmount");
            string CSRVariantId = (string)financialInformation.Element(ns + "CSRVariantId");
            string ratingArea = (string)financialInformation.Element(ns + "RatingArea");

            List<XElement> memberInformations = policy.Elements(ns + "MemberInformation").ToList();

            foreach (XElement memberInformation in memberInformations)
            {
                string exchangeAssignedMemberId = (string)memberInformation.Element(ns + "ExchangeAssignedMemberId");
                string SubscriberIndicator = (string)memberInformation.Element(ns + "SubscriberIndicator");
                string MemberLastName = (string)memberInformation.Element(ns + "MemberLastName");
                string MemberFirstName = (string)memberInformation.Element(ns + "MemberFirstName");
                DateTime BirthDate = (DateTime)memberInformation.Element(ns + "BirthDate");
                string SocialSecurityNumber = (string)memberInformation.Element(ns + "SocialSecurityNumber");
                string PostalCode = (string)memberInformation.Element(ns + "PostalCode");
                string LanguageQualifierCode = (string)memberInformation.Element(ns + "LanguageQualifierCode");
                string LanguageCode = (string)memberInformation.Element(ns + "LanguageCode");
                string GenderCode = (string)memberInformation.Element(ns + "GenderCode");
                string TobaccoUseCode = (string)memberInformation.Element(ns + "TobaccoUseCode");
                DateTime MemberStartDate = (DateTime)memberInformation.Descendants(ns + "MemberStartDate").FirstOrDefault();
                DateTime MemberEndDate = (DateTime)memberInformation.Descendants(ns + "MemberEndDate").FirstOrDefault();

                DataRow newRow = dt.Rows.Add();
                // sample of adding rows to table, need to complete
                newRow["ratingArea"] = ratingArea;
                newRow["ExchangeAssignedMemberId"] = exchangeAssignedMemberId;


            }
        }
    }

}

private void loadAll() { LiveData<List<Category>> liveData = categoriesRepository.getAllCategories(); liveData.observe(getView(), categories -> { callView(view -> view.setData(categories)); }); } 方法有2个参数。

第二个参数 - liveData.observe() - 一切都很清楚

但是第一个参数 - @NonNull Observer<T> observer，这就是我的问题：

我设置了@NonNull LifecycleOwner owner - 因为它返回了我的视图

getView()

但是android.support.v4.app.Fragment implements ..., LifecycleOwner可以返回Null，而AS则说我关于它

我该如何解决？我很厚，我需要在getView()中保留LifecycleOwner个实体，而不是从presenter获取吗？我想在我的Presenter中正确地实现View方法