HeaderRecycleAdapter/StickHeaderItemDecoration,头部加载Adapter及固定头部装...

      package com.taro.headerrecycle.adapter;

import android.support.annotation.NonNull;
import android.support.v4.util.ArrayMap;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

import com.taro.headerrecycle.stickerheader.StickHeaderItemDecoration;
import com.taro.headerrecycle.layoutmanager.HeaderSpanSizeLookup;

import java.util.AbstractMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Created by taro on 16/5/19.
 */
public class ExtraViewWrapAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements StickHeaderItemDecoration.IStickerHeaderDecoration, HeaderSpanSizeLookup.ISpanSizeHandler {
    public static final int VIEW_HEADER_REFRESH = Integer.MAX_VALUE / 3;
    public static final int VIEW_FOOTER_LOAD_MORE = Integer.MIN_VALUE / 3;

    private HeaderFooterViewCache mHeaderOption = null;
    private HeaderFooterViewCache mFooterOption = null;
    private StickHeaderItemDecoration.IStickerHeaderDecoration mIStickHeaderDecoration = null;
    private HeaderSpanSizeLookup.ISpanSizeHandler mISpanSizeLookup = null;


    private View mRefreshHeader = null;
    private View mLoadMoreFooter = null;
    private boolean mIsRefreshing = false;
    private boolean mIsLoading = false;
    private RecyclerView.Adapter mInnerAdapter;
    private boolean mIsFootViewEnable = true;
    private boolean mIsHeaderViewEnable = true;

    public static final void setRrefreshingViewStatus(boolean isRefreshing, boolean isScrollToStart, RecyclerView recyclerView) {
        if (recyclerView == null) {
            return;
        } else {
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter != null && adapter instanceof ExtraViewWrapAdapter) {
                ExtraViewWrapAdapter wrapAdapter = (ExtraViewWrapAdapter) adapter;
                wrapAdapter.setRefreshingStatus(isRefreshing);
                if (isScrollToStart) {
                    recyclerView.scrollToPosition(0);
                }
            }
        }
    }

    public static final void setLoadingViewStatus(boolean isLoading, boolean isScrollToEnd, RecyclerView recyclerView) {
        if (recyclerView == null) {
            return;
        } else {
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter != null && adapter instanceof ExtraViewWrapAdapter) {
                ExtraViewWrapAdapter wrapAdapter = (ExtraViewWrapAdapter) adapter;
                wrapAdapter.setLoadingStatus(isLoading);
                if (isScrollToEnd) {
                    recyclerView.scrollToPosition(wrapAdapter.getItemCount() - 1);
                }
            }
        }
    }

    public static final void setHeaderViewEnable(boolean isHeaderEnable, boolean isScrollToHeader, RecyclerView recycleView) {
        if (recycleView == null) {
            return;
        } else {
            RecyclerView.Adapter adapter = recycleView.getAdapter();
            if (adapter != null && adapter instanceof ExtraViewWrapAdapter) {
                ExtraViewWrapAdapter wrapAdapter = (ExtraViewWrapAdapter) adapter;
                wrapAdapter.setHeaderViewEnable(isHeaderEnable);
                if (isScrollToHeader) {
                    recycleView.scrollToPosition(0);
                }
            }
        }
    }

    public static final void setFooterViewEnable(boolean isFooterEnable, boolean isScrollToFooter, RecyclerView recyclerView) {
        if (recyclerView == null) {
            return;
        } else {
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter != null && adapter instanceof ExtraViewWrapAdapter) {
                ExtraViewWrapAdapter wrapAdapter = (ExtraViewWrapAdapter) adapter;
                wrapAdapter.setFootViewEnable(isFooterEnable);
                if (isScrollToFooter) {
                    recyclerView.scrollToPosition(wrapAdapter.getItemCount() - 1);
                }
            }
        }
    }

    /**
     * 默认创建多头部/尾部包装类的adapter,头部/尾部都可显示
     *
     * @param innerAdapter
     */
    public ExtraViewWrapAdapter(@NonNull RecyclerView.Adapter innerAdapter) {
        this(innerAdapter, true, true);
    }

    /**
     * 创建多头部/尾部包装类的adapter,使用此adapter包装内部adapter时会改变内部adapter的某些操作,当不再需要时请使用{@link #unregisterInnerAdatperDataObserver()}还原内部adapter的操作
     *
     * @param innerAdapter       内部引用的adapter,不可为null
     * @param isHeaderViewEnable 头部view是否可用
     * @param isFootViewEnable   尾部view是否可用
     */
    public ExtraViewWrapAdapter(@NonNull RecyclerView.Adapter innerAdapter, boolean isHeaderViewEnable, boolean isFootViewEnable) {
        this.setInnerAdapter(innerAdapter);
        mIsHeaderViewEnable = isHeaderViewEnable;
        mIsFootViewEnable = isFootViewEnable;
        mHeaderOption = new HeaderFooterViewCache();
        mFooterOption = new HeaderFooterViewCache();
        mInnerAdapter.registerAdapterDataObserver(mDataObserver);
    }

    /**
     * 设置固定头部item渲染的接口回调
     *
     * @param decoration 固定头部接口,用于回调判断当前项是否为头部/是否需要显示及绘制固定头部
     */
    public void setIStickHeaderItemDecoration(StickHeaderItemDecoration.IStickerHeaderDecoration decoration) {
        mIStickHeaderDecoration = decoration;
    }

    /**
     * 设置 gridLayoutManager 需要显示的spanSizeLookup
     *
     * @param spanSizeLookup 用于正确显示item占用的网格数
     */
    public void setISpanSizeLookup(HeaderSpanSizeLookup.ISpanSizeHandler spanSizeLookup) {
        mISpanSizeLookup = spanSizeLookup;
    }

    /**
     * 设置内置的innerAdapter,不可为null
     *
     * @param innerAdapter recycleView.Adapter,若该adapter已经实现了 {@link StickHeaderItemDecoration.IStickerHeaderDecoration}或者是{@link com.taro.headerrecycle.layoutmanager.HeaderSpanSizeLookup.ISpanSizeHandler}
     *                     将直接引用此实例,不需要再重新设置一次两个接口
     */
    public void setInnerAdapter(@NonNull RecyclerView.Adapter innerAdapter) {
        mInnerAdapter = innerAdapter;
        if (mInnerAdapter != null && mInnerAdapter instanceof StickHeaderItemDecoration.IStickerHeaderDecoration) {
            mIStickHeaderDecoration = (StickHeaderItemDecoration.IStickerHeaderDecoration) mInnerAdapter;
        }

        if (mInnerAdapter != null && mInnerAdapter instanceof HeaderSpanSizeLookup.ISpanSizeHandler) {
            mISpanSizeLookup = (HeaderSpanSizeLookup.ISpanSizeHandler) mInnerAdapter;
        }
    }

    /**
     * 反注册内部innerAdapter的数据更新observer
     */
    public void unregisterInnerAdatperDataObserver() {
        if (mInnerAdapter != null) {
            mInnerAdapter.unregisterAdapterDataObserver(mDataObserver);
        }
    }

    /**
     * 重新注册内部innerAdapter的数据更新observer
     */
    public void reregisterInnerAdapterDataObserver() {
        if (mInnerAdapter != null) {
            mInnerAdapter.registerAdapterDataObserver(mDataObserver);
        }
    }

    /**
     * 获取当前WrapAdapter位置在InnerAdapter中对应的位置,即除去headerView及refreshView
     *
     * @param wrapAdapterPosition 当前WrapAdapter的位置
     * @return
     */
    public int getInnerAdapterPosition(int wrapAdapterPosition) {
        int refreshViewCount = getRefreshingViewCount();
        int headerViewCount = getHeaderViewCount();
        return wrapAdapterPosition - refreshViewCount - headerViewCount;
    }

    /**
     * 设置刷新头部view
     *
     * @param refreshingView
     */
    public void setRefreshingHeaderView(View refreshingView) {
        mRefreshHeader = refreshingView;
    }

    /**
     * 设置加载尾部v