package com.mcxtzhang.zxtcommonlib.recyclerview;
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;
/**
* 介绍:一个给RecyclerView添加HeaderView FooterView的装饰Adapter类
* 作者:zhangxutong
* 邮箱:zhangxutong@imcoming.com
* 时间: 2016/8/2.
*/
public class HeaderAndFooterWrapperAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int BASE_ITEM_TYPE_HEADER = 1000000;//headerview的viewtype基准值
private static final int BASE_ITEM_TYPE_FOOTER = 2000000;//footerView的ViewType基准值
private SparseArrayCompat<View> mHeaderViews = new SparseArrayCompat<>();//存放HeaderViews,key是viewType
private SparseArrayCompat<View> mFooterViews = new SparseArrayCompat<>();//存放FooterViews,key是viewType
protected RecyclerView.Adapter mInnerAdapter;//内部的的普通Adapter
public HeaderAndFooterWrapperAdapter(RecyclerView.Adapter mInnerAdapter) {
this.mInnerAdapter = mInnerAdapter;
}
public int getHeaderViewCount() {
return mHeaderViews.size();
}
public int getFooterViewCount() {
return mFooterViews.size();
}
private 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 v
*/
public void addHeaderView(View v) {
mHeaderViews.put(mHeaderViews.size() + BASE_ITEM_TYPE_HEADER, v);
}
/**
* 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() {
mHeaderViews.clear();
}
public void clearFooterView() {
mFooterViews.clear();
}
/**
* 设置HeaderView(会先清空Headerview)
*
* @param v
*/
public void setHeaderView(View v) {
clearHeaderView();
addHeaderView(v);
}
public void setFooterView(View v) {
clearFooterView();
addFooterView(v);
}
public View getHeaderView(int pos) {
if (pos < mHeaderViews.size()) {
return mHeaderViews.get(mHeaderViews.keyAt(pos));
}
return null;
}
@Override
public int getItemViewType(int position) {
if (isHeaderViewPos(position)) {
return mHeaderViews.keyAt(position);
} 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 super.getItemViewType(position - getHeaderViewCount());
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (mHeaderViews.get(viewType) != null) {//不为空,说明是headerview
return new ViewHolder(parent.getContext(), mHeaderViews.get(viewType));
} else if (mFooterViews.get(viewType) != null) {//不为空,说明是footerview
return new ViewHolder(parent.getContext(), mFooterViews.get(viewType));
}
return mInnerAdapter.onCreateViewHolder(parent, viewType);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (isHeaderViewPos(position)) {
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);
//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 (mHeaderViews.get(viewType) != null) {
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);
}
}
}
}