StickyHeaderRecyclerViewRecyclerView 悬浮吸顶 Header

RecyclerView 悬浮吸顶 Header，支持点击事件与状态绑定。

依赖

compile 'com.yuyang:stickyheaders:1.0.0'

用法

Header Model

Header Model 需要实现 StickyHeaderModel 接口

public class HeaderItem implements StickyHeaderModel {

    public final String title;

    /**
     * 状态保存示例，如果header存在一些交互性行为，在onBindViewHolder里面需要绑定悬浮header的状态
     */
    public int color = 0xff777777;

    public HeaderItem(String title) {
        this.title = title;
    }
}

public class Item {

    public final String title;
    public final String message;

    public Item(String title, String message) {
        this.title = title;
        this.message = message;
    }
}

Adapter

RecyclerView Adapter 需要实现 StickyHeaderProvider 接口，并在 getAdapterData() 返回 model 数据，用于判断对应 position 是否为 Header

public final class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.BaseViewHolder> implements StickyHeaderProvider {

    private final List<Object> dataList = new ArrayList<>();

    @Override
    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == 0) {
            return new ItemViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view, parent, false));
        } else {
            return new HeaderViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.header_view, parent, false));
        }
    }

    @Override
    public void onBindViewHolder(final BaseViewHolder holder, final int position) {
        
    }

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

    @Override
    public int getItemViewType(int position) {
        return dataList.get(position) instanceof Item ? 0 : 1;
    }

    @Override
    public List<?> getAdapterData() {
        return dataList;
    }

    private static final class ItemViewHolder extends BaseViewHolder {

        TextView titleTextView;
        TextView messageTextView;

        ItemViewHolder(View itemView) {
            super(itemView);

            titleTextView = itemView.findViewById(R.id.tv_title);
            messageTextView = itemView.findViewById(R.id.tv_message);
        }
    }

    private static final class HeaderViewHolder extends BaseViewHolder {

        TextView titleTextView;
        TextView button;

        HeaderViewHolder(View itemView) {
            super(itemView);

            titleTextView = itemView.findViewById(R.id.tv_title);
            button = itemView.findViewById(R.id.button);
        }
    }

    static class BaseViewHolder extends RecyclerView.ViewHolder {

        BaseViewHolder(View itemView) {
            super(itemView);
        }
    }
}

RecyclerView

RecyclerView recyclerView = findViewById(R.id.recycler_view);
RecyclerAdapter adapter = new RecyclerAdapter();
adapter.setDataList(genDataList(0));
// StickyLinearLayoutManager 替代 LinearLayoutManager
StickyLinearLayoutManager layoutManager = new StickyLinearLayoutManager(this, adapter);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);