RecyclerView添加多个样式不同的Item布局

RecyclerView加载一种Item显示，往往不能满足我们在项目中开发的需要，下面我来给大家演示一下RecyclerView如何给它添加多个布局文件

那么现在问题来了，这样实现的方式有很多种，1、通过RecyclerView中的Adapter中的getItemType();进行判断加载不的布局属于哪一种样式，

通过样式来加载，但是这儿就会写很多的代码，比如每一个viewHolder对应一种将被加载的布局，这样写起来的缺点是，加载耗时，浪费资源

今天我采用另外一种方式呈现给大家，希望给大家带来一定的帮助。详情请看代码：

public abstract class MoreHeaderRecyclerAdapter
                        extends RecyclerView.ViewHolder, ItemHolder extends RecyclerView.ViewHolder> extends RecyclerView.Adapter {
    public static int TYPE_HEAD = 0;//头部
    public static int TYPE_HEAD_TWO = 1;
    public static int TYPE_ITEM = 2;
    public static int TYPE_FOOT = 3;

    public abstract HeaderHolder onCreateHeaderViewHolder(ViewGroup parent, int position);

    public abstract HeaderTHolder onCreateHeaderTViewHolder(ViewGroup parent, int position);

    public abstract ItemHolder onCreateItemViewHolder(ViewGroup parent, int position);

    public abstract void onBindHeaderViewHolder(HeaderHolder holder, int position);

    public abstract void onBindHeaderTViewHolder(HeaderTHolder holder, int position);

    public abstract void onBindItemHolderViewHolder(ItemHolder holder, int position);

    //第三部分和第二部分的接口回调函数
    public interface DetalisCallBack {
        void getDetalisData(int index, int position);
    }

    public DetalisCallBack detalisCallBack;

    public DetalisCallBack getDetalisCallBack() {
        return detalisCallBack;
    }

    public void setDetalisCallBack(DetalisCallBack detalisCallBack) {
        this.detalisCallBack = detalisCallBack;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType) {
            case 0:
                return onCreateHeaderViewHolder(parent, viewType);
            case 1:
                return onCreateHeaderTViewHolder(parent, viewType);
            default:
                return onCreateItemViewHolder(parent, viewType);
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        int headerCount = getHeadViewCount();
        int headerTCount = getHeadTViewCount();
        int itemType = getItemViewType(position);
        switch (itemType) {
            case 0:
                onBindHeaderViewHolder((HeaderHolder) holder, position);
                break;
            case 1:
                onBindHeaderTViewHolder((HeaderTHolder) holder, position - headerCount);
                break;
            case 2:
                onBindItemHolderViewHolder((ItemHolder) holder, position - headerTCount - headerCount);
                break;
        }
    }

    public abstract int getHeadTViewCount();

    public abstract int getHeadViewCount();

    public abstract int getItemViewCount();

    @Override
    public int getItemCount() {
        return getItemViewCount() + getHeadTViewCount() + getHeadViewCount();
    }

    @Override
    public int getItemViewType(int position) {
        int headerCount = getHeadViewCount();
        int headerTCount = getHeadTViewCount();
        if (position < headerCount) {
            return TYPE_HEAD;
        }
        if (position <= headerTCount) {
            return TYPE_HEAD_TWO;
        }
        return TYPE_ITEM;
    }
}

下面我们一起来看看在activity或fragment中的使用：

MoreHeaderRecyclerAdapter adapter = new MoreHeaderRecyclerAdapter() {
            @Override
            public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent, int position) {
                View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.public_item_viewpager, null);
                return new HeaderHolder(view);
            }

            @Override
            public RecyclerView.ViewHolder onCreateHeaderTViewHolder(ViewGroup parent, int position) {
                View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.public_item_infos_two, null);
                return new HeaderTHolder(view);
            }

            @Override
            public RecyclerView.ViewHolder onCreateItemViewHolder(ViewGroup parent, final int position) {
                View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.detalis_layout_item, null);
                return new ItemHolder(view);
            }

            @Override
            public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
                HeaderHolder itemHolder = (HeaderHolder) holder;
                itemHolder.PmViewPager.setAdapter(infoPageAdapter);
                infoPageAdapter.UpDataUrl(dataUtils.initAdapterData(imageViews, urls, simpleDraweeViews, SimpleList, infoPageAdapter));
            }

            @Override
            public void onBindHeaderTViewHolder(RecyclerView.ViewHolder holder, final int position) {
                HeaderTHolder tHolder = (HeaderTHolder) holder;
                tHolder.public_text_content.setText("订单详情");
                tHolder.alter.setText("详情");
                tHolder.LayoutRight.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (adapter.detalisCallBack != null) {
                            adapter.detalisCallBack.getDetalisData(0, position);
                        }
                    }
                });
            }

            @Override
            public void onBindItemHolderViewHolder(RecyclerView.ViewHolder holder, final int position) {
                ItemHolder itemHolder = (ItemHolder) holder;
                itemHolder.bossName.setText(list.get(position).getClientId());
                itemHolder.detalisSate.setText(list.get(position).getDetailsState());
                itemHolder.detalisType.setText(list.get(position).getDetailsType());
                itemHolder.detalisTime.setText(list.get(position).getOrdersTime());
                itemHolder.detallisNumber.setText(list.get(position).getDetailsNumber());
                itemHolder.itemView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (adapter.detalisCallBack != null) {
                            adapter.detalisCallBack.getDetalisData(1, position);
                        }
                    }
                });
            }
            @Override
            public int getHeadTViewCount() {
                return 1;
            }

            @Override
            public int getHeadViewCount() {
                return 1;
            }

            @Override
            public int getItemViewCount() {
                return list.size();
            }
        };

这样我们再用起来就简单多了，对于这样的封装， 我们还算满意，再做完添加header后，相信大家对于footer也有想法了，有想法就实现它吧！