getAdapterPosition（）不返回RecyclerView中物品的位置

Question

这是对this post的一种后续或补充。我试图在我的RecyclerView中获取某个项目的位置，但是我尝试过的方法都没有奏效。

我在PersonViewHolder构造称为getAdapterPosition（），并指定其价值的整数位置，这是在UnitOneFragment类用于相应地做一些事情（见的onClick（）方法）。但无论什么东西，它都不会发生，我的猜测是因为getAdapterPosition（）方法不起作用或未正确使用。

我的适配器：

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(); 
    } 
} 

其他类：

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; 
    } 
} 

我的代码似乎不言自明，但如果有什么困惑，请让我知道，我会添加更多的信息。再一次，问题是我无法在RecyclerView中获取该物品的位置，然后采取行动。

Answer 1

呼叫getAdapterPosition你的onClick方法，因为这样在点击时ü要了解项目的位置。如果你在创建时检查它会（大部分时间）不准确。