public class ListAdapter extends BaseAdapter {/** * Item类型,int值.必须从0开始依次递增. * */ private static final int TYPE_TITLE = 0; private static final int TYPE_CONTENT = 1; /** * Item Type 的数量 * */ private static final int TYPE_ITEM_COUNT = 2; /** * 数据 * */ private List<Company> mData = new ArrayList<>(); private Context context; public ListAdapter(Context context,List<Company>mData){ this.context = context; this.mData = mData; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup viewGroup) { /** * 不同类型的ViewHolder * */ TitleViewHolder titleViewHolder = null; CompanyViewHolder contentViewHolder = null; /** * 对类型进行判断,分别inflate不同的布局. * */ switch (getItemViewType(position)){ case TYPE_TITLE: titleViewHolder = new TitleViewHolder(); if(convertView == null){ convertView = View.inflate(context, R.layout.view_holder_company_index,null); titleViewHolder.title = (TextView) convertView.findViewById(R.id.tv_title); //setTag()  convertView.setTag(titleViewHolder); }else{ //getTag(); titleViewHolder = (TitleViewHolder) convertView.getTag(); } titleViewHolder.title.setText(mData.get(position).getName()); break; case TYPE_CONTENT: contentViewHolder = new CompanyViewHolder(); if(convertView == null){ convertView = View.inflate(context,R.layout.view_holder_company,null); contentViewHolder.content = (TextView) convertView.findViewById(R.id.tv_content); convertView.setTag(contentViewHolder); }else{ contentViewHolder = (CompanyViewHolder) convertView.getTag(); } contentViewHolder.content.setText(mData.get(position).getCode()); break; } return convertView; } /** * 根据position获取Item的类型 * */ @Override public int getItemViewType(int position) { if(TextUtils.isEmpty(mData.get(position).getCode())){ return TYPE_TITLE; }else{ return TYPE_CONTENT; } } /** * 返回Item Type的总数量 * */ @Override public int getViewTypeCount() { return TYPE_ITEM_COUNT; } static class TitleViewHolder{ TextView title; } static class CompanyViewHolder{ TextView content; } }

/***ListView在针对不同Item复用时会调用这个方法*为每一种不同的Item设置一个RecycleBin,用于复用.*/
public void setViewTypeCount(int viewTypeCount) { if (viewTypeCount < 1) { throw new IllegalArgumentException("Can't have a viewTypeCount < 1"); } // noinspection unchecked /** * 根据viewTypeCount的数量设置一个ArrayList. * 同时为每一个Item再设置一个ArrayList,用来存储ScrapView. * 相当于一个二维数组来维护每一个Item的ScrapView数组. * 这里也就相当于为不同的Item设置单独的RecycleBin. */ ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount]; for (int i = 0; i < viewTypeCount; i++) { scrapViews[i] = new ArrayList<View>(); } //保存ViewTypeCount,也就 = 2 mViewTypeCount = viewTypeCount; //当前的Scrap是第一个Item的ScrapView数组. mCurrentScrap = scrapViews[0]; //mScrapViews就保存了一个二维数组维护的RecycleBin. mScrapViews = scrapViews; }

  void addScrapView(View scrap) {  AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams();  if (lp == null) { return; } // Don't put header or footer views or views that should be ignored // into the scrap heap int viewType = lp.viewType; if (!shouldRecycleViewType(viewType)) { if (viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { removeDetachedView(scrap, false); } return; } /** *核心代码就是这块,由于我们mViewTypeCount != 1 的,因此if条件不成立. *因此会执行else代码. */ if (mViewTypeCount == 1) { dispatchFinishTemporaryDetach(scrap); mCurrentScrap.add(scrap); } else { dispatchFinishTemporaryDetach(scrap); mScrapViews[viewType].add(scrap); } if (mRecyclerListener != null) { mRecyclerListener.onMovedToScrapHeap(scrap); } }