Android ViewPager嵌套片段生命周期

我将嵌套片段和viewPager一起使用。以下是我的

HomeFragment

代码，它是viewPager中的片段之一

HomeFragment

保存另一个名为

FeedFragment

的片段，它只是一个

RecyclerView

。在

FeedFragment

内部，我正在使用一个回调接口，通知

HomeFragment

已成功创建

FeedFragment

。我遇到的问题是，第一次创建

HomeFragment

时，

mListener

值被设置为

HomeFragment

内部

onCreateView

的实例，并且所有内容都被正确加载。当我移动到viewPager中的另一个片段并返回到

HomeFragment

时，

HomeFragment

onCreateView

方法被调用，

mListener

再次被设置为

HomeFragment

的一个实例，然后从

FeedFragment

调用

onCreateView

方法，但

mListener

这次是

null

以下是FeedFragment的代码：

public class FeedFragment extends Fragment {

    RecyclerView feedRecyclerView;
    FeedRecyclerViewAdapter feedRecyclerViewAdapter;
    private OnCompleteListener mListener;

    public FeedFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_feed, container, false);

        feedRecyclerView = (RecyclerView) view.findViewById(R.id.postFeedItemContainer);
        feedRecyclerViewAdapter = new FeedRecyclerViewAdapter(getActivity());
        feedRecyclerView.setAdapter(feedRecyclerViewAdapter);
        feedRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mListener.onComplete(feedRecyclerViewAdapter, this);

        return view;
    }

    public interface OnCompleteListener {
        void onComplete(
                FeedRecyclerViewAdapter feedRecyclerViewAdapter, FeedFragment feedFragment);
    }

    public void setmListener(OnCompleteListener mListener) {
        this.mListener = mListener;
    }
}

以下是HomeFragment的代码：

public class HomeFragment extends Fragment implements FeedFragment.OnCompleteListener {

    // presenter instance
    private HomeFragmentPresenter homeFragmentPresenter = HomeFragmentPresenter.getInstance();

    public HomeFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        FragmentTransaction fragmentTransaction = getChildFragmentManager().beginTransaction();
        FeedFragment feedFragment = new FeedFragment();
        feedFragment.setmListener(this);
        fragmentTransaction.add(R.id.fragmentHomeFeedContainer, feedFragment);
        fragmentTransaction.commit();

        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home, container, false);
    }

    @Override
    public void onComplete(FeedRecyclerViewAdapter feedRecyclerViewAdapter, FeedFragment feedFragment) {
        homeFragmentPresenter.fetchDataForAdapter(feedRecyclerViewAdapter, feedFragment);
    }
}