public class MainActivity extends AppCompatActivity {
		//    必要的三部分，相比于listView多了一个layoutManager，layoutManager是一个抽象类
		//    用来测量和放置item，也可以制定item的回收规则，在这里，我们直接用的他的子类LinearLayoutManager
		    private RecyclerView recyclerView;
		    private RecyclerView.Adapter adapter;
		    private RecyclerView.LayoutManager layoutManager;
		//    数据list
		    private List<String> list;
		    @Override
		    protected void onCreate(Bundle savedInstanceState) {
		        requestWindowFeature(Window.FEATURE_NO_TITLE);
		        super.onCreate(savedInstanceState);
		        setContentView(R.layout.content_main);
		        //初始化数据
		        initData();
		        recyclerView = (RecyclerView) findViewById(R.id.listView);
		        layoutManager = new LinearLayoutManager(this);
		//        adpater需要重写三个方法，必须重新创建ViewHolder
		        adapter = new RecyclerView.Adapter() {
		            @Override
		            public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
		                MyViewHolder viewHolder = new MyViewHolder(LayoutInflater.from(MainActivity.this).inflate(R.layout.item_listview, parent, false));
		                return viewHolder;
		            }
		//用来更新item里的内容，不要用这里的position来做别的事情，比如onClick事件，你可以用getAdapterPosition来获取更新后的position
		            @Override
		            public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
		                ((MyViewHolder) holder).textView.setText(list.get(position));
		            }
		            @Override
		            public int getItemCount() {
		                return list.size();
		            }
		//ViewHolder可以通过新建view填充或者从xml布局文件填充
		            class MyViewHolder extends RecyclerView.ViewHolder {
		                TextView textView;
	
		                public MyViewHolder(View itemView) {
		                    super(itemView);
		                    textView = (TextView) itemView.findViewById(R.id.textView);
		                }
		            }
		        };
		//        最后把adapter和layoutManager都设置好就可以了。
		        recyclerView.setAdapter(adapter);
		        recyclerView.setLayoutManager(layoutManager);
		    }
		
		    //初始化的方法
		    private void initData() {
		        list = new ArrayList<>();
		        for (int i = 0; i < 100; i++) {
		            list.add("id:" + i);
		        }
		    }
		}