package com.mcxtzhang.commonadapter.rv;
import android.support.v4.util.SparseArrayCompat;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
/**
* 介绍：一个给RecyclerView添加HeaderView FooterView的装饰Adapter类
* 重点哦~ RecyclerView的HeaderView将可以被系统回收，不像老版的HeaderView是一个强引用在内存里
* 作者：zhangxutong
* 邮箱：zhangxutong@imcoming.com
* 时间： 2016/8/2.
*/
public abstract class HeaderRecyclerAndFooterWrapperAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
protected class HeaderData {
private final int DEFAULT_HEADER_VIEW_CACHE_SIZE = 5;//默认是5 和RecyclerViewPool的默认值一样
private int layoutId;//viewType当做layoutId
private Object data;//该viewType(LayoutId)对应的数据
private int cacheSize;//该种viewType的HeaderView 在RecyclerViewPool的缓存池内的缓存数量
public HeaderData(int layoutId, Object data, int cacheSize) {
this.layoutId = layoutId;
this.data = data;
this.cacheSize = cacheSize;
}
public HeaderData(int layoutId, Object data) {
this.layoutId = layoutId;
this.data = data;
this.cacheSize = DEFAULT_HEADER_VIEW_CACHE_SIZE;
}
public int getLayoutId() {
return layoutId;
}
public void setLayoutId(int layoutId) {
this.layoutId = layoutId;
}
public Object getData() {
return data;
}
public void setData(Object data) {
this.data = data;
}
public int getCacheSize() {
return cacheSize;
}
public void setCacheSize(int cacheSize) {
this.cacheSize = cacheSize;
}
}
protected static final int BASE_ITEM_TYPE_FOOTER = 2000000;//footerView的ViewType基准值
//存放HeaderViews的layoudID和data,key是viewType，value 是 layoudID和data，在createViewHOlder里根据layoutId创建UI,在onbindViewHOlder里依据这个data渲染UI
protected ArrayList<HeaderData> mHeaderDatas = new ArrayList<HeaderData>();
protected SparseArrayCompat<View> mFooterViews = new SparseArrayCompat<>();//存放FooterViews,key是viewType
protected RecyclerView.Adapter mInnerAdapter;//内部的的普通Adapter
public HeaderRecyclerAndFooterWrapperAdapter(RecyclerView.Adapter mInnerAdapter) {
this.mInnerAdapter = mInnerAdapter;
}
public int getHeaderViewCount() {
return mHeaderDatas.size();
}
public int getFooterViewCount() {
return mFooterViews.size();
}
protected int getInnerItemCount() {
return mInnerAdapter != null ? mInnerAdapter.getItemCount() : 0;
}
/**
* 传入position 判断是否是headerview
*
* @param position
* @return
*/
public boolean isHeaderViewPos(int position) {// 举例， 2 个头，pos 0 1，true， 2+ false
return getHeaderViewCount() > position;
}
/**
* 传入postion判断是否是footerview
*
* @param position
* @return
*/
public boolean isFooterViewPos(int position) {//举例， 2个头，2个inner，pos 0 1 2 3 ,false,4+true
return position >= getHeaderViewCount() + getInnerItemCount();
}
/**
* 添加HeaderView
*
* @param layoutId headerView 的LayoutId
* @param data headerView 的data(可能多种不同类型的header 只能用Object了)
*/
public void addHeaderView(int layoutId, Object data) {
//mHeaderViews.put(mHeaderViews.size() + BASE_ITEM_TYPE_HEADER, v);
/* SparseArrayCompat headerContainer = new SparseArrayCompat();
headerContainer.put(layoutId, data);
mHeaderDatas.put(mHeaderDatas.size() + BASE_ITEM_TYPE_HEADER, headerContainer);*/
mHeaderDatas.add(new HeaderData(layoutId, data));
}
/**
* 添加HeaderView
*
* @param layoutId headerView 的LayoutId
* @param data headerView 的data(可能多种不同类型的header 只能用Object了)
* @param cacheSize 该种headerView在缓存池中的缓存个数
*/
public void addHeaderView(int layoutId, Object data, int cacheSize) {
//mHeaderViews.put(mHeaderViews.size() + BASE_ITEM_TYPE_HEADER, v);
/* SparseArrayCompat headerContainer = new SparseArrayCompat();
headerContainer.put(layoutId, data);
mHeaderDatas.put(mHeaderDatas.size() + BASE_ITEM_TYPE_HEADER, headerContainer);*/
mHeaderDatas.add(new HeaderData(layoutId, data, cacheSize));
}
/**
* 设置某个位置的HeaderView
*
* @param headerPos 从0开始，如果pos过大 就是addHeaderview
* @param layoutId
* @param data
*/
public void setHeaderView(int headerPos, int layoutId, Object data) {
if (mHeaderDatas.size() > headerPos) {
/* SparseArrayCompat headerContainer = new SparseArrayCompat();
headerContainer.put(layoutId, data);
mHeaderDatas.setValueAt(headerPos, headerContainer);*/
mHeaderDatas.get(headerPos).setLayoutId(layoutId);
mHeaderDatas.get(headerPos).setData(data);
} else if (mHeaderDatas.size() == headerPos) {//调用addHeaderView
addHeaderView(layoutId, data);
} else {
//
addHeaderView(layoutId, data);
}
}
/**
* 设置某个位置的HeaderView
*
* @param headerPos 从0开始，如果pos过大 就是addHeaderview
* @param layoutId
* @param data
* @param cacheSize 该种headerView在缓存池中的缓存个数
*/
public void setHeaderView(int headerPos, int layoutId, Object data, int cacheSize) {
if (mHeaderDatas.size() > headerPos) {
/* SparseArrayCompat headerContainer = new SparseArrayCompat();
headerContainer.put(layoutId, data);
mHeaderDatas.setValueAt(headerPos, headerContainer);*/
mHeaderDatas.get(headerPos).setLayoutId(layoutId);
mHeaderDatas.get(headerPos).setData(data);
mHeaderDatas.get(headerPos).setCacheSize(cacheSize);
} else if (mHeaderDatas.size() == headerPos) {//调用addHeaderView
addHeaderView(layoutId, data, cacheSize);
} else {
//
addHeaderView(layoutId, data, cacheSize);
}
}
/**
* 添加FooterView
*
* @param v
*/
public void addFooterView(View v) {
mFooterViews.put(mFooterViews.size() + BASE_ITEM_TYPE_FOOTER, v);
}
/**
* 清空HeaderView数据
*/
public void clearHeaderView() {
mHeaderDatas.clear();
}
public void clearFooterView() {
mFooterViews.clear();
}
public void setFooterView(View v) {
clearFooterView();
addFooterView(v);
}
@Override
public int getItemViewType(int position) {
if (isHeaderViewPos(position)) {
return mHeaderDatas.get(position).getLayoutId();
} else if (isFooterViewPos(position)) {//举例：header 2， innter 2， 0123都不是，4才是，4-2-2 = 0，ok。
return mFooterViews.keyAt(position - getHeaderViewCount() - getInnerItemCount());
}
return mInnerAdapter.getItemViewType(position - getHeaderViewCount());
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (mHeaderDatas != null && !mHeaderDatas.isEmpty()) {//不为空，说明有headerview
for (HeaderData headerData : mHeaderDatas) {
if (headerData.getLayoutId() == viewType) {//匹配上了说明是headerView
return ViewHolder.get(parent.getContext(), parent, viewType);
}
}
}
if (mFooterViews.get(viewType) != null) {//不为空，说明是footerview
return new ViewHolder(mFooterViews.get(viewType));
}
return mInnerAdapter.onCreateViewHolder(parent, viewType);
}
//protected abstract RecyclerView.ViewHolder createHeader(ViewGroup parent, int headerPos);
protected abstract void onBindHeaderHolder(ViewHolder holder, int headerPos, int layoutId, Object o);//多回传一个layoutId出去，用于判断是第几个headerview
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (isHeaderViewPos(position)) {
onBindHeaderHolder((ViewHolder) holder, position, mHeaderDatas.get(position).getLayoutId(), mHeaderDatas.get(position).getData());
return;
} else if (isFooterViewPos(position)) {
return;
}
//举例子，2个header，0 1是头，2是开始，2-2 = 0
mInnerAdapter.onBindViewHolder(holder, position - getHeaderViewCount());
}
@Override
public int getItemCount() {
return getInnerItemCount() + getHeaderViewCount() + getFooterViewCount();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
mInnerAdapter.onAttachedToRecyclerView(recyclerView);
//设置HeaderView的ViewHolder的缓存数量
if (null != mHeaderDatas && !mHeaderDatas.isEmpty()) {
for (HeaderData headerData : mHeaderDatas) {
recyclerView.getRecycledViewPool().setMaxRecycledViews(headerData.getLayoutId(), headerData.getCacheSize());
}
}
//为了兼容GridLayout
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
final GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
final GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
int viewType = getItemViewType(position);
if (isHeaderViewPos(position)) {
return gridLayoutManager.getSpanCount();
} else if (mFooterViews.get(viewType) != null) {
return gridLayoutManager.getSpanCount();
}
if (spanSizeLookup != null)
return spanSizeLookup.getSpanSize(position);
return 1;
}
});
gridLayoutManager.setSpanCount(gridLayoutManager.getSpanCount());
}
}
@Override
public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) {
mInnerAdapter.onViewAttachedToWindow(holder);
int position = holder.getLayoutPosition();
if (isHeaderViewPos(position) || isFooterViewPos(position)) {
ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
if (lp != null
&& lp instanceof StaggeredGridLayoutManager.LayoutParams) {
StaggeredGridLayoutManager.LayoutParams p =
(StaggeredGridLayoutManager.LayoutParams) lp;
p.setFullSpan(true);
}
}
}
}