為RecyclerView新增多種佈局，MultiItemTypeAdapter，文章很詳細，篇幅比較長，請耐心看完

思路：
(1).資料來源List<T> 中每條item,即T 有可能對應不同的佈局模式，這就是的Recyclerview中出現了多佈局，在此，我們定義一個介面管理每條item的佈局，如下：

public interface ItemViewDelegate<T>
{

    int getItemViewLayoutId();

    boolean isForViewType(T item, int position);

    void convert(ViewHolder holder, T t, int
 
 position);

}

注意：
boolean isForViewType(T item, int position); 是當符合某一條件時就使用這個佈局，比如資料 T.getID = 1; 就是說你自己規定一個滿足使用此佈局的條件，並且該條件通常跟資料來源T有關；
int getItemViewLayoutId(); 返回符合條件的佈局的id
void convert(ViewHolder holder, T t, int position); holder做操作

進一步演示，首先我們建立實體類，如下：
public class ChatMessage
{
    private int
 
 icon;
    private String name;
    private String content;
    private String createDate;
    private boolean isComMeg;

    public final static int RECIEVE_MSG = 0;
    public final static int SEND_MSG = 1;

    public ChatMessage(int icon, String name, String content,
            String createDate, boolean isComMeg)
    {
        this
 
.icon = icon;
        this.name = name;
        this.content = content;
        this.createDate = createDate;
        this.isComMeg = isComMeg;
    }

    public boolean isComMeg()
    {
        return isComMeg;
    }

    public void setComMeg(boolean isComMeg)
    {
        this.isComMeg = isComMeg;
    }

    public String getContent()
    {
        return content;
    }

    public void setContent(String content)
    {
        this.content = content;
    }

    public int getIcon()
    {
        return icon;
    }

    public void setIcon(int icon)
    {
        this.icon = icon;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public String getCreateDate()
    {
        return createDate;
    }

    public void setCreateDate(String createDate)
    {
        this.createDate = createDate;
    }

    @Override
    public String toString()
    {
        return "ChatMessage [icon=" + icon + ", name=" + name + ", content="
                + content + ", createDate=" + createDate +", isComing = "+ isComMeg()+ "]";
    }

    public static List<ChatMessage> MOCK_DATAS = new ArrayList<>();

    static {
        ChatMessage msg = null;
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);

        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.renma, "renma", "where are you ",
                null, true);
        MOCK_DATAS.add(msg);
        msg = new ChatMessage(R.drawable.xiaohei, "xiaohei", "where are you ",
                null, false);
        MOCK_DATAS.add(msg);
    }
}

那麼，我們如何建立多種佈局呢？做法如下：
public class MsgSendItemDelagate implements ItemViewDelegate<ChatMessage>
{

    @Override
    public int getItemViewLayoutId()
    {
        return R.layout.main_chat_send_msg;
    }

    @Override
    public boolean isForViewType(ChatMessage item, int position)
    {
        //直接返回true就是不考慮資料對佈局的影響，直接都使用單種佈局
        return item.isComMeg();//單條資料  （當這條資料的isComMeg是ture就符合這個佈局）
    }

    @Override
    public void convert(ViewHolder holder, final ChatMessage chatMessage, int position)
    {
        holder.setText(R.id.chat_send_content, chatMessage.getContent());
        holder.setText(R.id.chat_send_name, chatMessage.getName());
        holder.setImageResource(R.id.chat_send_icon, chatMessage.getIcon());
    }
}

思路
(2).到此我們可以建立不同的佈局，但是，建立完佈局之後我們如何管理呢？這就需要一個管理者，它就是ItemViewDelegateManager<T>，在此挑主要方法講解
public class ItemViewDelegateManager<T>
{
    //佈局管理者的集合
    SparseArrayCompat<ItemViewDelegate<T>> delegates = new SparseArrayCompat();

    public int getItemViewDelegateCount()
    {
        return delegates.size();
    }

    //新增型別
    public ItemViewDelegateManager<T> addDelegate(ItemViewDelegate<T> delegate)
    {
        int viewType = delegates.size();
        if (delegate != null)
        {
            delegates.put(viewType, delegate);
            viewType++;
        }
        return this;
    }
    public int getItemViewType(T item, int position)
    {
        //獲取佈局型別的個數
        int delegatesCount = delegates.size();
        for (int i = delegatesCount - 1; i >= 0; i--)
        {
            //獲取一種佈局
            ItemViewDelegate<T> delegate = delegates.valueAt(i);
            //在上面說到的MsgSendItemDelagate類裡面，當資料 return item.isComMeg();
            if (delegate.isForViewType( item, position))
            {
                return delegates.keyAt(i);
            }else{

            }
        }
        throw new IllegalArgumentException(
                "No ItemViewDelegate added that matches position=" + position + " in data source");
    }

到此，基本的難點就將完了，尼瑪，累了，後面再寫。
最後附上鴻洋大神的地址：[來自鴻洋](https://github.com/hongyangAndroid/baseAdapter)