OnFragmentInteractionListener显示为null

Question

我已经搜索并搜索了这个问题并尝试了许多不同的解决方案，但似乎没有任何工作。

我尝试访问我的片段布局中的对象，但是它变为null并且我意识到我的OnFragmentInteractionListener为null，这使我相信它没有吸引正确的片段。

这几乎是来自应用程序的另一个活动的复制粘贴，并且该活动完美无缺。出于某种原因，这个人只是不想沟通。

TLDR：片段中的mListener（negativeThoughtView.java）为空

我只包含了缩短代码的重要部分：

活动（JournalView.java）

public class JournalView extends AppCompatActivity implements negativeThoughtView.OnFragmentInteractionListener, distortionView.OnFragmentInteractionListener, challengingThoughtView.OnFragmentInteractionListener {

    TabLayout thoughtsTab;
    ViewPager viewPager;
    PagerAdapterView adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_journal_view);

        thoughtsTab = (TabLayout) findViewById(R.id.thoughtsViewTabs);
        thoughtsTab.addTab(thoughtsTab.newTab().setText("Negative Thoughts"));
        thoughtsTab.addTab(thoughtsTab.newTab().setText("Distortions"));
        thoughtsTab.addTab(thoughtsTab.newTab().setText("Challenging Thoughts"));
        thoughtsTab.setTabGravity(thoughtsTab.GRAVITY_FILL);

        adapter = new PagerAdapterView(getSupportFragmentManager(), thoughtsTab.getTabCount());

        viewPager = (ViewPager) findViewById(R.id.thoughtsViewPager);
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(thoughtsTab));

        thoughtsTab.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {

            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

        negativeThoughtView NegativeThoughtView =(negativeThoughtView) adapter.instantiateItem(viewPager, 0);
        distortionView DistortionView =(distortionView) adapter.instantiateItem(viewPager, 1);
        challengingThoughtView ChallengingThoughtView =(challengingThoughtView) adapter.instantiateItem(viewPager, 2);

        if (NegativeThoughtView != null) {
            String negativeThoughts = "Tester";
            NegativeThoughtView.onButtonPressed(negativeThoughts);
        }
        if (ChallengingThoughtView != null) {
            String challengingThoughts= "Tester";
            ChallengingThoughtView.onButtonPressed(challengingThoughts);
        }
        if (DistortionView != null) {
            String distortions= "Tester";
            DistortionView.onButtonPressed(distortions);
        }
    }

    @Override
    public void onFragmentInteraction(Uri uri) {

    }

    @Override
    public void negativeThoughtView(String string) {

    }

    @Override
    public void challengingThoughtView(String string) {

    }

    @Override
    public void distortionView(String string) {

    }
}

片段（negativeThoughtsView.java）

public class negativeThoughtView extends Fragment {
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    private String mParam1;
    private String mParam2;
    TextView negativeThoughtEntry;

    private OnFragmentInteractionListener mListener;

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

    public static negativeThoughtView newInstance(String param1, String param2) {
        negativeThoughtView fragment = new negativeThoughtView();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_negative_thought_view, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        negativeThoughtEntry = (TextView) getView().findViewById(R.id.negativeThoughtEntry3);
    }

    public void onButtonPressed(String negativeThought) {
        Log.d("Passer","1");
        if (mListener != null) {
            Log.d("Passer","2");
            negativeThoughtEntry.setText(negativeThought);
            //mListener.negativeThoughtView(negativeThought);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
            Log.d("Passer","mListener good");
        } else {
            Log.d("Passer","mListener null");
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
        void negativeThoughtView(String string);
    }
}