getAdapterPosition() nicht wieder die position des Elements in der RecyclerView

Dies ist eine Art von follow-up oder Ergänzung zu dieser Beitrag. Ich werde versuchen, die position eines Elements in meine RecyclerView, aber keine der Methoden, die ich versucht habe haben gearbeitet.

Rief ich getAdapterPosition() in meinem PersonViewHolder Konstruktor zugewiesen, dessen Wert den integer position, die in der UnitOneFragment Klasse, etwas zu tun, entsprechend (siehe onClick() - Methode). Aber was auch immer dieses etwas ist, ist es nicht geschehen, und meine Vermutung ist, weil die getAdapterPosition() Methode funktioniert nicht oder ist nicht richtig eingesetzt.

Mein adapter:

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder> {

Context mContext;

RVAdapter(Context context, List<Chapter> chapters) {
    mContext = context;
    this.chapters = chapters;
}

public static CardView cv;
public static int position;
public static String chapterNumberTitle;

public class PersonViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    TextView chapterName;
    TextView chapterNumber;
    //ImageView chapterPhoto;

    public PersonViewHolder(View itemView) {
        super(itemView);

        cv = (CardView) itemView.findViewById(R.id.cv);
        chapterName = (TextView) itemView.findViewById(R.id.chapter_name);
        chapterNumber = (TextView) itemView.findViewById(R.id.chapter_number);
        //chapterPhoto = (ImageView) itemView.findViewById(R.id.person_photo);

        chapterNumberTitle = chapterNumber.getText().toString();
        position = getAdapterPosition();

        itemView.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        UnitOneFragment.chapterChecker();

        Intent intent = new Intent(mContext, ChapterActivity.class);
        mContext.startActivity(intent);
    }
}

List<Chapter> chapters;

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

@Override
public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
    PersonViewHolder pvh = new PersonViewHolder(v);
    return pvh;
}

@Override
public void onBindViewHolder(PersonViewHolder personViewHolder, int i) {
    personViewHolder.chapterName.setText(chapters.get(i).chapterName);
    personViewHolder.chapterNumber.setText(chapters.get(i).chapterNumber);
    //personViewHolder.chapterPhoto.setImageResource(persons.get(i).photoId);

}

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

Den anderen in der Klasse:

public class UnitOneFragment extends android.support.v4.app.Fragment {

private List<Chapter> chapters;
private RecyclerView rv;
private RecyclerView.LayoutManager llm;

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


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

    getActivity().setTitle("Unit One");

    rv = (RecyclerView) v.findViewById(R.id.rv);
    rv.setHasFixedSize(true);

    llm = new LinearLayoutManager(getActivity());
    rv.setLayoutManager(llm);

    initializeData();
    initializeAdapter();

    return v;
}

private void initializeData() {
    chapters = new ArrayList<>();
    chapters.add(new Chapter("Human Prehistory to the Early Civilizations", "Chapter One"));
    chapters.add(new Chapter("Classical China", "Chapter Two"));
    chapters.add(new Chapter("Classical India", "Chapter Three"));
    chapters.add(new Chapter("Classical Greece and Rome", "Chapter Four"));
    chapters.add(new Chapter("Classical Period: Declines and Diversities", "Chapter Five"));
}

private void initializeAdapter() {
    RVAdapter adapter = new RVAdapter(getActivity(), chapters);
    rv.setAdapter(adapter);
}

public static void chapterChecker() {

    if (RVAdapter.position == 0) {
        SummaryFragment.summaryText.setText("Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of \"de Finibus Bonorum et Malorum\" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, \"Lorem ipsum dolor sit amet..\", comes from a line in section 1.10.32.");
        }
    }
}

class Chapter {
String chapterName;
String chapterNumber;
//int photoId;

Chapter(String chaptername, String chapternumber) {
    this.chapterName = chaptername;
    this.chapterNumber = chapternumber;
    //this.photoId = photoId;
    }
}

Mein code scheint ziemlich selbsterklärend, aber wenn es etwas verwirrend, bitte lassen Sie mich wissen, und ich will hinzufügen, mehr Informationen. Noch einmal, das problem ist, dass ich kann nicht die position des Elements in der RecyclerView und dann zu handeln.