自定义recyclerVier adpater的OnClick侦听器在嵌套片段中不起作用

Question

我使用视图分页器在父片段中包含3个子片段。在第一个子片段上，我有一个回收者视图列表。我的自定义适配器中有一个on Click和onLongClick，第一个片段中有一个click侦听器。适配器似乎可以正常工作，因为在onBind内，我可以更改列表位置的背景，但是在我的第一个片段上，如果我在单击侦听器内不进行Toast，则什么也没发生。但是，如果我滑动到最后一个片段并返回到第一个片段，它将开始工作。我不明白发生了什么。

我的父母片段：

public class EventFragment extends Fragment implements FragmentInterface{
View view;
ViewPager viewPager;
TabLayout tabLayout;
private String idDiscipline;

public EventFragment() {
}

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {
   view=inflater.inflate(R.layout.fragment_event,container,false);
      return view;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    viewPager=(ViewPager)view.findViewById(R.id.event_view_pager);
    tabLayout=view.findViewById(R.id.event_tab_layout);

    tabLayout.setupWithViewPager(viewPager);
    SectionPagerAdapter adapter=new SectionPagerAdapter(getChildFragmentManager());

    adapter.addFrag(new Child1Fragment();,"Classes");
    adapter.addFrag(new Child2Fragment(),"Specials");
    adapter.addFrag(new Child3Fragment(),"Events");
    viewPager.setAdapter(adapter);
}
}

我的PagerAdapter

 public class PagerAdapter extends FragmentPagerAdapter {
    private List<Fragment> mFragmentList  = new ArrayList<>();
    private List<String> mFragmentTitleList  = new ArrayList<>();

    public PagerAdapter(FragmentManager manager) {
        super(manager);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFrag(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }
    }

我的孩子1片段

public class Child1Fragment extends Fragment {
private Realm realm;
private RealmResults<Classe> classList;
private RecyclerView rvNormalClass;
private ClassAdapter classAdapter;

public Child1Fragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_child1, container, false);

    realm = Realm.getDefaultInstance();
    classList = realm.where(MyClass.class).findAll();
    rvNormalClass = view.findViewById(R.id.rv__parent_class);    

    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
    rvNormalClass.setLayoutManager(layoutManager);
    classAdapter = new ClassAdapter(getContext(), classList);
    rvNormalClass.setAdapter(classAdapter);

    classAdapter.setOnItemClickListener(new ClassAdapter.ClickListener() {
        @Override
        public void onItemClick(ClassAdapter adapter, View v, int position) {
        }

        @Override
        public void onItemLongClick(ClassAdapter adapter, View v, int position) {
             }
    });

    return view;
}
}

我的RecyclerView列表的ClassAdapter

public class ClassAdapter extends RecyclerView.Adapter<ClassAdapter.ParentHolder> {
private List<Classe> dataset;
private static ClickListener clickListener;
private Context mContext;
static int myIndex = -1;

public ClassAdapter(Context mContext, List<Classe> dataset) {
    this.dataset = dataset;
    this.mContext = mContext;
}

public List<Classe> getClassDataSet() {
    return dataset;
}


public static class ParentHolder extends RecyclerView.ViewHolder implements View.OnLongClickListener, View.OnClickListener {
    private TextView classType;
    private ClassAdapter adapterRef;

    public ParentHolder(@NonNull View containingView, ClassAdapter ref) {
        super(containingView);
        classType=containingView.findViewById(R.id.tv_class_title);

        adapterRef = ref;
        containingView.setOnLongClickListener(this);
        containingView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        clickListener.onItemClick(adapterRef, v, getAdapterPosition());
    }

    @Override
    public boolean onLongClick(View v) {
        clickListener.onItemLongClick(adapterRef, v, getAdapterPosition());
        myIndex = getAdapterPosition();
        adapterRef.notifyDataSetChanged();
        return true;
    }
}

@NonNull
@Override
public ParentHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.row_class, parent, false);
    ParentHolder pvh = new ParentHolder(v, this);
    return pvh;
}

@Override
public void onBindViewHolder(@NonNull ParentHolder holder, int position) {
         holder.classType.setVisibility(View.VISIBLE);

    if (myIndex==position) {
        holder.classType.setBackgroundColor(Color.parseColor("#EF9A9A"));
        myIndex = -1;
    } else {
       holder.classType.setBackgroundColor(Color.parseColor("#FFFFFF"));;
    }
}

@Override
public int getItemCount() {
    return this.dataset.size();
}

public void setOnItemClickListener(ClickListener clickListener) {
    ClassAdapter.clickListener = clickListener;
}

public interface ClickListener {
    void onItemClick(ClassAdapter adapter, View v, int position);
    void onItemLongClick(ClassAdapter adapter, View v, int position);
}
}

我的父母片段xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".fragments.EventFragment">
<LinearLayout
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/event_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white">
        <android.support.design.widget.TabLayout
            android:id="@+id/event_tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </android.support.design.widget.TabLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/event_view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v4.view.ViewPager>   
</LinearLayout>   
</android.support.constraint.ConstraintLayout>