由简到繁,循序渐进
实现了:
0,点击&长按事件;
1,header;
2,footer;
3,加载更多;
4,还想下拉刷新?“想的美,这本就不是RecyclerView该做的事情!”
import java.util.ArrayList; import java.util.List; import com.example.test.R; import com.widget.view.HeaderFooterAdapter.ViewHolder; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; /** * 为了用RecyclerView创建一个带header的grid: 1,定义一个具有两种view类型的adapter,一个为header一个为普通item。 2,inflate一个header,把它传递给adapter。 3,重写GridLayoutManager中的setSpanSizeLookup,在header所处的位置返回和span count(列数)相等的 span size。 * @author Administrator * */ public class HeaderFooterAdapter<T> extends RecyclerView.Adapter<ViewHolder> { private static final int ITEM_VIEW_TYPE_HEADER = 0; private static final int ITEM_VIEW_TYPE_ITEM = 1; private static final int ITEM_VIEW_TYPE_FOOTER = 2; private final View header; private final View footer; private int headerCount=0; private int footerCount=0; private final List<T> beans; public HeaderFooterAdapter(View header, View footer,List<T> beans) { headerCount=header == null?0:1; footerCount=footer == null?0:1; this.header = header; this.footer = footer; this.beans = beans; } public boolean isHeader(int position) { if(headerCount==0){ return false; } return position == 0; } public boolean isFooter(int position) { if(footerCount==0){ return false; } return position == beans.size()+headerCount;// add 1 for footer // return position == getItemCount()-headerCount;// or Subtract 1 for footer } @Override public ViewHolder<T> onCreateViewHolder(ViewGroup parent, int viewType) { if (viewType == ITEM_VIEW_TYPE_HEADER) { return new ViewHolder<T>(header); } if (viewType == ITEM_VIEW_TYPE_FOOTER) { return new ViewHolder<T>(footer); } View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false); return new ViewHolder<T>(view); } @Override public void onBindViewHolder(final ViewHolder holder, final int position) { if (isHeader(position)) { return; } if (isFooter(position)) { return; } final T bean = beans.get(position - headerCount); // Subtract 1 for header holder.textView.setText(bean.toString()); } @Override public int getItemViewType(int position) { if(isHeader(position)){ return ITEM_VIEW_TYPE_HEADER; } if(isFooter(position)){ return ITEM_VIEW_TYPE_FOOTER; } return ITEM_VIEW_TYPE_ITEM; } /** * 获得实际View的数量,包括header和footer */ @Override public int getItemCount() { return beans.size() + headerCount+footerCount; } class ViewHolder<T> extends RecyclerView.ViewHolder implements View.OnClickListener,View.OnLongClickListener{ public TextView textView; public ViewHolder(View itemView) { super(itemView); if (onItemClickLitener != null){ itemView.setOnClickListener(this); } if(onItemLongClickLitener!=null){ itemView.setOnLongClickListener(this); } textView = (TextView) itemView.findViewById(R.id.item_0); } @Override public void onClick(View v) { // TODO Auto-generated method stub onItemClickLitener.onItemClick(v, getLayoutPosition());//getPosition()被废弃了 } @Override public boolean onLongClick(View v) { // TODO Auto-generated method stub onItemLongClickLitener.onItemLongClick(v, getLayoutPosition()); return true; } } private static OnItemClickLitener onItemClickLitener; public void setOnItemClickLitener(OnItemClickLitener onItemClickLitener) { this.onItemClickLitener = onItemClickLitener; } public interface OnItemClickLitener { /** * 点击回调,注意position,指的是在Adapter中的位置,已经算上header * @param view * @param position */ void onItemClick(View view, int position); } private static OnItemLongClickLitener onItemLongClickLitener; public void setOnItemLongClickLitener(OnItemLongClickLitener onItemLongClickLitener) { this.onItemLongClickLitener = onItemLongClickLitener; } public interface OnItemLongClickLitener { /** * 长按回调,注意position,指的是在Adapter中的位置,已经算上header * @param view * @param position */ void onItemLongClick(View view, int position); } /** * 在position位置插入item * @param position:指的是item在beans中的位置,而不是在Adapter中的位置; * 所以在notifyItemInserted的时候需要算上header * @param item */ public void addItemAt(int position,T item) { beans.add(position, item); notifyItemInserted(position+headerCount); } /** * 在底部添加Items * @param items */ public void addItemsAtLast(ArrayList<T> items) { int size=beans.size(); beans.addAll(items); notifyItemRangeInserted(size+headerCount, items.size()); } /** * 移除position位置的Item * @param position :指的是item在beans中的位置,而不是在Adapter中的位置; * 所以在notifyItemInserted的时候需要算上header */ public void removeItemAt(int position) { beans.remove(position); notifyItemRemoved(position+headerCount); } /** * 获得中间Item的数量,不包括header和footer * @return */ public int getItemSize(){ return beans.size(); } }
ArrayList<String> list=new ArrayList<String>(); for (int i = 0; i < 30; ++i) { list.add(String.valueOf(i)); } View header = LayoutInflater.from(this).inflate(R.layout.header_view, recyclerView, false); View footer = LayoutInflater.from(this).inflate(R.layout.footer_view, recyclerView, false); final HeaderFooterAdapter<String> adapter = new HeaderFooterAdapter<String>(header,footer, list); adapter.setOnItemClickLitener(new HeaderFooterAdapter.OnItemClickLitener() { @Override public void onItemClick(View view, int position) { // TODO Auto-generated method stub if(adapter.isHeader(position)){ Toast.makeText(context, "header clicked", Toast.LENGTH_SHORT).show(); }else if(adapter.isFooter(position)){ Toast.makeText(context, "footer clicked", Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(context, "header item "+position, Toast.LENGTH_SHORT).show(); } } }); final GridLayoutManager manager = new GridLayoutManager(this, 2); manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() { @Override public int getSpanSize(int position) { if(adapter.isHeader(position)||adapter.isFooter(position)){ return manager.getSpanCount(); } return 1; } }); //如果可以确定每个item的高度是固定的,设置这个选项可以提高性能 recyclerView.setHasFixedSize(true); recyclerView.setLayoutManager(manager); recyclerView.setAdapter(adapter); recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() { @Override public void onScrolled(RecyclerView rv, int dx, int dy) { boolean isBottom = manager.findLastCompletelyVisibleItemPosition()>= adapter.getItemCount()-1; if (isBottom) { ArrayList<String> list=new ArrayList<String>(); int size=adapter.getItemSize(); for (int i = size; i < 30+size; ++i) { list.add(String.valueOf(i)); } adapter.addItemsAtLast(list); } } });
这是一个如你熟悉ListView、GridView一样熟悉的RecyclerView类库,你可以用以前使用ListView / GridView的习惯来使用RecyclerView,这些可让你将项目原有的ListView / GridView / 瀑布流 迁移到RecyclerView时减少许多工作量.
你必须了解的RecyclerView的五大开源项目-解决上拉加载、下拉刷新和添加Header、Footer等问题
http://www.see-source.com/blog/300000035/1463.html
滑动到顶部/底部 可拉伸回弹的ListView与ScrollView
https://github.com/teisun/SunmiUI