RecycleVIew添加和删除，以及三种展现方式

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.View;import android.widget.Button;import android.widget.Toast;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {private RecyclerView myview;    private Button but1,but2,but3,but4,but5;    private MyManger adapter;    private int count=10;    private List<Integer> list=new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        myview= (RecyclerView) findViewById(R.id.myrecycle);        but1= (Button) findViewById(R.id.button);        but2= (Button) findViewById(R.id.button2);        but3= (Button) findViewById(R.id.button3);        but4= (Button) findViewById(R.id.button4);        but5= (Button) findViewById(R.id.button5);for (int i=0;i<=count;i++){    list.add(R.mipmap.ic_launcher+i);}        myview.setLayoutManager(new LinearLayoutManager(this));        adapter=new MyManger(this,list);        myview.setItemAnimator(new DefaultItemAnimator());        myview.setAdapter(adapter);        but3.setOnClickListener(new View.OnClickListener() {

//默认垂直分布            @Override            public void onClick(View view) {                myview.setLayoutManager(new LinearLayoutManager(MainActivity.this));                adapter=new MyManger(MainActivity.this,list);                myview.setItemAnimator(new DefaultItemAnimator());                myview.setAdapter(adapter);            }        });        but4.setOnClickListener(new View.OnClickListener() {

//网格分布            @Override            public void onClick(View view) {                myview.setLayoutManager(new GridLayoutManager(MainActivity.this,3));                adapter=new MyManger(MainActivity.this,list);                myview.setItemAnimator(new DefaultItemAnimator());                myview.setAdapter(adapter);            }        });        but5.setOnClickListener(new View.OnClickListener() {

//瀑布流分布            @Override            public void onClick(View view) {                myview.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));                adapter=new MyManger(MainActivity.this,list);                myview.setItemAnimator(new DefaultItemAnimator());                myview.setAdapter(adapter);            }        });but1.setOnClickListener(new View.OnClickListener() {

//添加的方法    @Override    public void onClick(View view) {        count++;        list.add(count);        adapter.notifyDataSetChanged();        Toast.makeText(MainActivity.this, "加了一个", Toast.LENGTH_SHORT).show();    }});but2.setOnClickListener(new View.OnClickListener() {

//删除的方法    @Override    public void onClick(View view) {       count--;        list.remove(count);        Toast.makeText(MainActivity.this, "减了一个", Toast.LENGTH_SHORT).show();        adapter.notifyDataSetChanged();    }});    }}

import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.util.ArrayList;import java.util.List;/** * Created by 张超飞 on 2017/10/13. */public class MyManger extends RecyclerView.Adapter<MyManger.MyViewHolder> {    private List<Integer> list=new ArrayList<>();    private Context context;    public MyManger(Context context, List<Integer> list) {        this.context = context;        this.list = list;    }    public OnRecyclerViewItemClickListener mOnItemClickListener = null;//点击    public void setOnItemClickListener(OnRecyclerViewItemClickListener listener) {        this.mOnItemClickListener = listener;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false);        MyViewHolder holder=new MyViewHolder(view);        return holder;    }    @Override    public void onBindViewHolder(MyViewHolder holder, final int position) {        holder.image.setImageResource(R.mipmap.ic_launcher);    }    @Override    public int getItemCount() {        return list.size();    }    public class MyViewHolder extends RecyclerView.ViewHolder {        ImageView image;        public MyViewHolder(View itemView) {            super(itemView);            image=itemView.findViewById(R.id.image);            itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    if (mOnItemClickListener!=null){                        mOnItemClickListener.onItemClick(view,getAdapterPosition());                    }                }            });        }    }}
  
实现一个接口
import android.view.View;/** * Created by 张超飞 on 2017/10/13. */public interface OnRecyclerViewItemClickListener {    void onItemClick(View view, int position);}