概述：
RecyclerView是android-support-v7-21版本中新增的一个Widgets，RecyclerView是ListView的升级版本，更加先进和灵活。在以后的开发中我们就可以直接使用RecyclerView来替换ListView。
特点介绍：
1. 可横向展示
2. 消除错位问题
3.标准化了ViewHolder
横向：
private void initHorizaontal(List<ItemModel> models) {RecyclerView recyclerView = (RecyclerView) findViewById(R.id.activity_main_horizontal_recyclerview);LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);recyclerView.setLayoutManager(layoutManager);RecyclerViewAdapter adapter = new RecyclerViewAdapter(MainActivity.this, models);recyclerView.setAdapter(adapter);}
竖向：
public void initVertical(List<ItemModel> models) {RecyclerView recyclerView = (RecyclerView) findViewById(R.id.activity_main_vertical_recyclerview);LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);layoutManager.setOrientation(LinearLayoutManager.VERTICAL);recyclerView.setLayoutManager(layoutManager);RecyclerViewAdapter adapter = new RecyclerViewAdapter(MainActivity.this, models);recyclerView.setAdapter(adapter);}
Adapter的变化：
Google在对RecyclerView的改进中还为我们解决了一个初学者比较头痛的问题：错位。
public class RecyclerViewAdapter extends RecyclerView.Adapter<ViewHolder> {private List<ItemModel> mList = null;private Context mContext = null;private LayoutInflater mInflater = null;public RecyclerViewAdapter(Context context, List<ItemModel> list) {mContext = context;mList = list;mInflater = LayoutInflater.from(mContext);}@Overridepublic int getItemCount() {if (mList != null) {return mList.size();}return 0;}@Overridepublic void onBindViewHolder(ViewHolder viewHolder, int position) {((ItemViewHolder)viewHolder).mLabelTextView.setText(mList.get(position).getLabel());}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup viewGroup, int arg1) {View view = mInflater.inflate(R.layout.list_item, viewGroup, false);ItemViewHolder holder = new ItemViewHolder(view);holder.mLabelTextView = (TextView) view.findViewById(R.id.list_item_textview);return holder;}public static class ItemViewHolder extends ViewHolder{public ItemViewHolder(View itemView) {super(itemView);}private TextView mLabelTextView = null;}}
上拉或下拉刷新：
对于下拉刷新，Android自身有一个控件SwipeRefreshLayout已经有所实现。我们把SwipeRefreshLayout包在RecyclerView的外面，然后再设置其绑定到一个OnRefreshListener上。
布局：
<android.support.v4.widget.SwipeRefreshLayoutxmlns:android="/apk/res/android"xmlns:tools="/tools"android:id="@+id/swipe_refresh_widget"android:layout_width="match_parent"android:layout_height="match_parent" ><android.support.v7.widget.RecyclerViewandroid:id="@android:id/list"android:layout_width="match_parent"android:layout_height="match_parent"android:cacheColorHint="@null"android:scrollbars="vertical" /></android.support.v4.widget.SwipeRefreshLayout>
监听：
@Overridepublic void onRefresh() {handler.sendEmptyMessageDelayed(0, 3000);}
而对于上拉刷新，我们则是自定义一个FooterView和线程来进行的。
mRecyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {@Overridepublic void onScrollStateChanged(RecyclerView recyclerView,int newState) {super.onScrollStateChanged(recyclerView, newState);if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 == adapter.getItemCount()) {handler.sendEmptyMessageDelayed(1, 3000);}}@Overridepublic void onScrolled(RecyclerView recyclerView, int dx, int dy) {super.onScrolled(recyclerView, dx, dy);lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();}});
相关源码下载：
RecyclerView初步使用
RecyclerView的上拉和下拉刷新
