RecyclerView 是5.0开始出来的新的ListView，主要是提高了性能，显示方式也多样化。
老版本中我们优化view都是通过定义一个Holder来实行的，现在的RecyclerView就封装了一个Holder
支持水平滚动和垂直滚动2种列表
还支持Grid格子布局和乱序的布局
ICON + TEXTpublic class Item {public int imgId;public String desc;public Item(String desc, int imgId) {this.desc = desc;this.imgId = imgId;}}
简单的Holder
public class MyViewHolder extends RecyclerView.ViewHolder {public MyViewHolder(View itemView) {super(itemView);}}public class MyRecyclerAdapter extends RecyclerView.Adapter<MyViewHolder> {private Activity activity;private List<Item> list;public MyRecyclerAdapter (Activity act, List<Item> list) {this.activity = act;this.list = list;}@Override //绑定一个UI作为Holder 提高性能public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View v = LayoutInflater.from(activity).inflate(R.layout.recy_item,null);MyViewHolder holder = new MyViewHolder(v);return holder;}//设置数据@Overridepublic void onBindViewHolder(MyViewHolder holder, int position) {Item item = list.get(position);TextView text1 = (TextView) holder.itemView.findViewById(R.id.text) ;text1.setText(item.desc);ImageView img = (ImageView) holder.itemView.findViewById(R.id.img);img.setImageResource(item.imgId);}@Overridepublic int getItemCount() {return list.size();}}recy_item.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=""android:layout_width="match_parent" android:layout_height="match_parent"android:orientation="horizontal"><ImageViewandroid:layout_width="70dp"android:layout_height="70dp"android:id = "@+id/img"android:scaleType="fitCenter"android:layout_marginLeft="2dp"android:layout_gravity="center_vertical"/><TextViewandroid:id="@+id/text"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginLeft="3dp"android:layout_marginTop="5dp"android:textColor="#336699"android:textSize="18sp"/></LinearLayout>
public class MainActivity extends ActionBarActivity {private List<Item> itemList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {String title = "To travel hopefully is a better thing than to arrive"; // String title = "";itemList = new ArrayList<Item>(5);itemList.add(new Item(title,R.drawable.cat0));itemList.add(new Item(title,R.drawable.cat0));itemList.add(new Item(title,R.drawable.cat2));itemList.add(new Item(title,R.drawable.cat3));itemList.add(new Item(title,R.drawable.cat4));itemList.add(new Item(title,R.drawable.cat4));itemList.add(new Item(title,R.drawable.cat3));itemList.add(new Item(title,R.drawable.cat2));itemList.add(new Item(title,R.drawable.cat3));itemList.add(new Item(title,R.drawable.cat2));itemList.add(new Item(title,R.drawable.cat4));itemList.add(new Item(title,R.drawable.cat4));itemList.add(new Item(title,R.drawable.cat4));itemList.add(new Item(title,R.drawable.cat0));itemList.add(new Item(title,R.drawable.cat3));RecyclerView list = (RecyclerView) findViewById(R.id.listview);// LinearLayoutManager mg = new LinearLayoutManager(this);//水平或垂直摆放，可以不用 HorizontalScrollView //mg.setOrientation(LinearLayoutManager.HORIZONTAL);GridLayoutManager mg = new GridLayoutManager(this,3);//格子摆放//交错性的摆放，有点win8那种格子风格，最好使用CardView作为item，有边框和圆角// StaggeredGridLayoutManager mg = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);list.setLayoutManager(mg);MyRecyclerAdapter adapter = new MyRecyclerAdapter(this, itemList);list.setAdapter(adapter);} }<RelativeLayout xmlns:android=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><android.support.v7.widget.RecyclerViewandroid:id = "@+id/listview"android:layout_width="fill_parent"android:layout_height = "fill_parent"/></RelativeLayout>
几种运行情况：
正常的List View
水平滚动
格子情况
GridLayoutManager mg = new GridLayoutManager(this,3); //3列
懂得接受失败的人，就是懂得人生真谛的人，
