RecyclerView GroupAdapter

Android RecyclerView 分组展示Adapter

import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.ViewGroup;

import java.util.List;

/**
 * Adapter that will group other adapter.
 * 

 * Created by dekalo on 03.09.15.
 */
public class GroupAdapter extends RecyclerView.Adapter {

    private RecyclerView.Adapter[] adapters;
    private int maxViewType = 1000;

    /**
     * Mentioned adapter should have view types not more than 100.
     *
     * @param adapters
     */
    public GroupAdapter(RecyclerView.Adapter... adapters) {
        this.adapters = adapters;
        registerObserver();
    }

    public void setAdapters(RecyclerView.Adapter... adapters) {
        this.adapters = adapters;
        registerObserver();
        notifyDataSetChanged();
    }

    public void setMaxViewTypeValue(int maxViewType) {
        this.maxViewType = maxViewType;
    }

    private void registerObserver() {
        for (RecyclerView.Adapter adapter : adapters) {
            adapter.registerAdapterDataObserver(new LocalObserver());
        }
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int absolutePosition) {
        int[] indexAndPosition = getAdapterIndexAndRelativePosition(absolutePosition);
        adapters[indexAndPosition[0]].onBindViewHolder(holder, indexAndPosition[1]);
    }

    @Override
    public void onViewRecycled(ViewHolder holder) {
        int[] indexAndPosition = getAdapterIndexAndRelativePosition(holder.getAdapterPosition());
        adapters[indexAndPosition[0]].onViewRecycled(holder);
    }

    @Override
    public void onViewDetachedFromWindow(ViewHolder holder) {
        int[] indexAndPosition = getAdapterIndexAndRelativePosition(holder.getAdapterPosition());
        adapters[indexAndPosition[0]].onViewDetachedFromWindow(holder);
    }

    @Override
    public boolean onFailedToRecycleView(ViewHolder holder) {
        int[] indexAndPosition = getAdapterIndexAndRelativePosition(holder.getAdapterPosition());
        return adapters[indexAndPosition[0]].onFailedToRecycleView(holder);
    }

    @Override
    public void onViewAttachedToWindow(ViewHolder holder) {
        int[] indexAndPosition = getAdapterIndexAndRelativePosition(holder.getAdapterPosition());
        adapters[indexAndPosition[0]].onViewAttachedToWindow(holder);
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        for (RecyclerView.Adapter adapter : adapters) {
            adapter.onAttachedToRecyclerView(recyclerView);
        }
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position, List