android - header TextView 与 RecyclerView

Question

我正在使用 RecyclerView + CardView现在要显示文本列表，我正在尝试添加一个普通的 TextView标题到 RecyclerView 的顶部所以我在适配器中有两种布局，但现在它在应用程序中显示如下:

它必须看起来像这样:

所以问题可能出在 getItemCount 上和 getItemViewType我必须更改什么，以便标题仅显示一次，然后是 CardViews .

public class Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

private static final int LAYOUT_ONE  = 0;
private static final int LAYOUT_TWO = 1;

List<AdapterData> mItems;

public Adapter() {
    super();
    mItems = new ArrayList<>();
    AdapterData data = new AdapterData();
    data.setCode("dummytext");
    data.setResult("dummytext");
    mItems.add(data);

    data = new AdapterData();
    data.setCode("dummytext");
    data.setResult("dummytext");
    mItems.add(data);

    data = new AdapterData();
    data.setCode("dummytext");
    data.setResult("dummytext");
    mItems.add(data);

    data = new AdapterData();
    data.setCode("dummytext");
    data.setResult("dummytext");
    mItems.add(data);

    data = new AdapterData();
    data.setCode("dummytext");
    data.setResult("dummytext");
    mItems.add(data);

}

@Override
public int getItemViewType(int position) {
    return position % 2;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    switch ( viewType ) {

        case LAYOUT_ONE: return new ViewHolderFirst(LayoutInflater.from(parent.getContext()).inflate(R.layout.top_textview, parent, false));

        case LAYOUT_TWO: return new ViewHolderSecond(LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view_card_item, parent, false));
    }

    return null;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    switch (getItemViewType(position)) {

        case LAYOUT_ONE:
            ViewHolderFirst viewHolderFirst = (ViewHolderFirst)holder;

            break;

        case LAYOUT_TWO:
            ViewHolderSecond viewHolderSecond = (ViewHolderSecond)holder;
            AdapterData data = mItems.get(position);
            viewHolderSecond.code.setText(data.getCode());
            viewHolderSecond.result.setText(data.getResult());

            break;
    }
}

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



class ViewHolderFirst extends RecyclerView.ViewHolder {
    public TextView header;

    public ViewHolderFirst(View itemView) {
        super(itemView);
        header = (TextView)itemView.findViewById(R.id.header_textview);

    }
}

class ViewHolderSecond extends RecyclerView.ViewHolder{
    public TextView code;
    public TextView result;

    public ViewHolderSecond(View itemView) {
        super(itemView);
        code = (TextView)itemView.findViewById(R.id.sims_code);
        result = (TextView)itemView.findViewById(R.id.sims_result);

    }
}


}

Answer 1

在 getItemViewType() 中试试这个

@Override
public int getItemViewType(int position) {
   return (position==0) ? 0 : 1;   //try this line
}