RecyclerView实现复杂首页(条目)布局

之前看一些APP时,发现首页布局大多很复杂,当时就在想这些复杂的布局时直接使用ListView或者RecyclerView
用不同的条目类型实现的,还是用ScrollView进行嵌套实现的呢?后来发现这两种其实都可以,只不过后来看到了
一篇博客才觉得用RecyclerView实现更加方便,用起来也更加舒爽！这篇博客就是liaoinstan大神的,地址我贴在
下面,大家可以去看看,这里我就把我使用的他的第二种方法贴出来进行展示.

liaoinstan 地址:http://blog.youkuaiyun.com/liaoinstan/article/details/52671101

这种方法主要是针对于GridLayoutManager网格布局管理器来进行设置的,因为GridLayoutManager可以设置 列数,而我们可以根据不同条目所占列数的不同来展示不同的条目,那如何来控制不同条目的所占的列数呢?
GridLayoutManager为我们提供了动态改变每个item所占列数的方法:

gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
       @Override
       public int getSpanSize(int position) {
          return gridManager.getSpanCount();
       }
}

getSpanSize方法，返回值就表示当前item占多少列，例如如果我们列数设置的为3列，返回3就表示铺满，也
就是和列表一样了。

如图所示，我们给RecyclerView设置一个列数为6的GridLayoutManager，然后再动态地为不同部位的item分
别设置SpanSize为6（铺满）、3（1/2）、2（1/3）就行了

接下来我就来贴下我所写的代码:

RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv);
        recyclerView.setLayoutManager(new GridLayoutManager(this, 3));

        BookDisplayAdapter adapter = new BookDisplayAdapter(this, images, bookNames);
        recyclerView.setAdapter(adapter);

下面是Adapter

public class BookDisplayAdapter extends RecyclerView.Adapter {
    public static final int TYPE_HEADER = 1;
    public static final int TYPE_ITEM = 2;
    public static final int TYPE_TITLE = 3;

    private int[] images;
    private String[] bookNames;
    private Context context;

    public BookDisplayAdapter(Context context,int[] images, String[] bookNames) {
        this.images = images;
        this.bookNames = bookNames;
        this.context = context;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType){
            case TYPE_HEADER:
                View headerView = View.inflate(parent.getContext(), R.layout.item_header, null);
                return new HeaderHolder(headerView);
            case TYPE_ITEM:
                View itemView = View.inflate(parent.getContext(), R.layout.item, null);
                return new ItemHolder(itemView);
            case TYPE_TITLE:
                View titleView = View.inflate(parent.getContext(), R.layout.item_title, null);
                return new TitleHolder(titleView);
            default:
                return null;
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof HeaderHolder){
            bindHeaderHoder(((HeaderHolder) holder),position);
        }else if (holder instanceof ItemHolder){
            bindItemHolder(((ItemHolder) holder),position);
        }
    }

    private void bindItemHolder(ItemHolder holder, int position1) {
        final int position = position1 - 2;
        holder.ivItem.setImageResource(images[position]);
        holder.tvItem.setText(bookNames[position]);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String bookName = bookNames[position];
                Toast.makeText(context,bookName,Toast.LENGTH_SHORT).show();
                if (mOnItemClickListener!=null){
                    mOnItemClickListener.onItemClick(bookName);
                }
            }
        });

    }

    public interface OnItemClickListener{
        void onItemClick(String bookName);
    }

    private OnItemClickListener mOnItemClickListener;

    public void setmOnItemClickListener(OnItemClickListener mOnItemClickListener) {
        this.mOnItemClickListener = mOnItemClickListener;
    }

    private void bindHeaderHoder(HeaderHolder holder, int position) {
        List<Integer> list = new ArrayList<>();
        list.add(R.drawable.banner1);

        ConvenientBanner convenientBanner = holder.convenientBanner;
        CBViewHolderCreator<LocalImageHolderView> holderCreator = new CBViewHolderCreator<LocalImageHolderView>() {
            @Override
            public LocalImageHolderView createHolder() {
                return new LocalImageHolderView();
            }
        };
        convenientBanner.setPages(holderCreator, list);
    }

    public class LocalImageHolderView implements Holder<Integer> {
        private ImageView imageView;
        @Override
        public View createView(Context context) {
            imageView = new ImageView(context);
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            return imageView;
        }

        @Override
        public void UpdateUI(Context context, final int position, Integer data) {
            imageView.setImageResource(data);
        }
    }

    @Override
    public int getItemCount() {
        return images.length+2;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0){
            return TYPE_HEADER;
        }else if (position == 1){
            return TYPE_TITLE;
        }else {
            return TYPE_ITEM;
        }
    }

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

        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if(manager instanceof GridLayoutManager) {
            final GridLayoutManager gridManager = ((GridLayoutManager) manager);
            gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                @Override
                public int getSpanSize(int position) {
                    int type = getItemViewType(position);
                    switch (type){
                        case TYPE_HEADER:
                        case TYPE_TITLE:
                            return gridManager.getSpanCount();
                        default:
                            return 1;
                    }
                }
            });
        }
    }

    static class HeaderHolder extends RecyclerView.ViewHolder {

        private ConvenientBanner convenientBanner;

        public HeaderHolder(View itemView) {
            super(itemView);
            convenientBanner = (ConvenientBanner) itemView.findViewById(R.id.convenientBanner);
        }
    }

    static class ItemHolder extends RecyclerView.ViewHolder {

        private TextView tvItem;
        private ImageView ivItem;

        public ItemHolder(View itemView) {
            super(itemView);
            tvItem = (TextView) itemView.findViewById(R.id.tv_item);
            ivItem = (ImageView) itemView.findViewById(R.id.iv_item);
        }
    }

    static class TitleHolder extends RecyclerView.ViewHolder {
        public TitleHolder(View itemView) {
            super(itemView);
        }
    }
}

最后的效果:

欢迎大家指正!!!