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 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 {
    private List list=new ArrayList<>();
    private Context context;

    public MyManger(Context context, List 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);
}