Question

我正在实施来自this的粘贴标头，它显示所有带标题的数据，但标题不粘。

我尝试使用LinearLayoutManager而不是库的LayoutManager，但它仍然无法正常工作。

public class MyListAdapterTest extends SectioningAdapter
{
Locale locale = Locale.getDefault();
static final boolean USE_DEBUG_APPEARANCE = false;

private class Section
{
    String alpha;
    ArrayList<Users> usersArrayList = new ArrayList<>();
}

public class ItemViewHolder extends SectioningAdapter.ItemViewHolder
{
    RelativeLayout relativeLayout;
    TextView name, product, description;
    ImageView mainimg, moreimg;

    public ItemViewHolder(View itemView)
    {
        super(itemView);
        relativeLayout = (RelativeLayout) itemView.findViewById(R.id.card_layout_relative_layout);
        name = (TextView) itemView.findViewById(R.id.card_layout_name_txt);
        product = (TextView) itemView.findViewById(R.id.card_layout_product_txt);
        description = (TextView) itemView.findViewById(R.id.card_layout_description_txt);
        mainimg = (ImageView) itemView.findViewById(R.id.card_layout_image);
        moreimg = (ImageView) itemView.findViewById(R.id.card_layout_moreimage);
    }
}

public class HeaderViewHolder extends SectioningAdapter.HeaderViewHolder
{
    TextView titleTextView;

    public HeaderViewHolder(View itemView)
    {
        super(itemView);
        titleTextView = (TextView) itemView.findViewById(R.id.card_header_txt);
    }
}


List<Users> usersList;
ArrayList<Section> sections = new ArrayList<>();

public MyListAdapterTest()
{

}

public List<Users> getUsersList()
{
    return usersList;
}

public void setUsersList(List<Users> usersList)
{
    this.usersList = usersList;
    sections.clear();

    // sort usersList into buckets by the first letter of last name
    char alpha = 0;
    Section currentSection = null;
    for (Users users : usersList)
    {

        if (users.getContact().charAt(0) != alpha)
        {
            if (currentSection != null)
            {
                sections.add(currentSection);
            }

            currentSection = new Section();
            alpha = users.getContact().charAt(0);
            currentSection.alpha = String.valueOf(alpha);
        }

        if (currentSection != null)
        {
            currentSection.usersArrayList.add(users);
        }
    }

    sections.add(currentSection);
    notifyAllSectionsDataSetChanged();
}

@Override
public int getNumberOfSections()
{
    return sections.size();
}

@Override
public int getNumberOfItemsInSection(int sectionIndex)
{
    return sections.get(sectionIndex).usersArrayList.size();
}


@Override
public boolean doesSectionHaveHeader(int sectionIndex)
{
    return true;
}

@Override
public boolean doesSectionHaveFooter(int sectionIndex)
{
    return false;
}

@Override
public ItemViewHolder onCreateItemViewHolder(ViewGroup parent)
{
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View v = inflater.inflate(R.layout.card_layout, parent, false);
    return new ItemViewHolder(v);
}

@Override
public HeaderViewHolder onCreateHeaderViewHolder(ViewGroup parent)
{
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View v = inflater.inflate(R.layout.card_header, parent, false);
    return new HeaderViewHolder(v);
}

@SuppressLint("SetTextI18n")
@Override
public void onBindItemViewHolder(SectioningAdapter.ItemViewHolder viewHolder, int sectionIndex, int itemIndex)
{
    Section s = sections.get(sectionIndex);
    ItemViewHolder ivh = (ItemViewHolder) viewHolder;
    Users person = s.usersArrayList.get(itemIndex);
    ivh.name.setText(person.getContact());
    ivh.product.setText(person.getContactPhone());
    ivh.description.setText(person.getSR_No() + "");
}

@SuppressLint("SetTextI18n")
@Override
public void onBindHeaderViewHolder(SectioningAdapter.HeaderViewHolder viewHolder, int sectionIndex)
{
    Section s = sections.get(sectionIndex);
    HeaderViewHolder hvh = (HeaderViewHolder) viewHolder;

    if (USE_DEBUG_APPEARANCE)
    {
        hvh.itemView.setBackgroundColor(0x55ffffff);
        hvh.titleTextView.setText(pad(sectionIndex * 2) + s.alpha);
    } else
    {
        hvh.titleTextView.setText(s.alpha);
    }
}


private String pad(int spaces)
{
    StringBuilder b = new StringBuilder();
    for (int i = 0; i < spaces; i++)
    {
        b.append(' ');
    }
    return b.toString();
}
}

我做错了什么？

Answer 1

我弄清楚问题是什么，我没有在我的适配器中的onBindItemViewHolder和onBindHeaderViewHolder中实现super，所以它应该是

@SuppressLint("SetTextI18n")
@Override
public void onBindItemViewHolder(SectioningAdapter.ItemViewHolder viewHolder, int sectionIndex, int itemIndex)
{
    super.onBindItemViewHolder(viewHolder, sectionIndex, itemIndex);
    Section s = sections.get(sectionIndex);
    ItemViewHolder ivh = (ItemViewHolder) viewHolder;
    Users person = s.usersArrayList.get(itemIndex);
    ivh.name.setText(person.getContact());
    ivh.product.setText(person.getContactPhone());
    ivh.description.setText(person.getSR_No() + "");
}

@SuppressLint("SetTextI18n")
@Override
public void onBindHeaderViewHolder(SectioningAdapter.HeaderViewHolder viewHolder, int sectionIndex)
{
    super.onBindHeaderViewHolder(viewHolder, sectionIndex);
    Section s = sections.get(sectionIndex);
    HeaderViewHolder hvh = (HeaderViewHolder) viewHolder;


    if (USE_DEBUG_APPEARANCE)
    {
        hvh.itemView.setBackgroundColor(0x55ffffff);
        hvh.titleTextView.setText(pad(sectionIndex * 2) + s.alpha);
    } else
    {
        hvh.titleTextView.setText(s.alpha);
    }
}

recylerview中的粘性标题

1 个答案: