// 添加数据
  public void addData(int position) {
//   在list中添加数据，并通知条目加入一条
    list.add(position, "我是商品" + position);
    //添加动画
    notifyItemInserted(position);
  }

 adapter.addData(list.size());

  // 删除数据
  public void removeData(int position) {
    list.remove(position);
    //删除动画
    notifyItemRemoved(position);
    notifyDataSetChanged();
  }

//Item里的删除
   removeData(position);
//外面的控件的删除
adapter. removeData(position);

package com.android.qzs.qzsrecycleview;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
  private RecyclerView mRecyclerView;
  private ImageView iv_add;
  private RecycleAdapter adapter;
  private List<String> list = new ArrayList<String>();
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initView();
    initRecycle();
    iv_add.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        //       添加自带默认动画
          adapter.addData(list.size());
    }
    });
  }
  private void initRecycle() {
    // 纵向滑动
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(linearLayoutManager);
//   获取数据，向适配器传数据，绑定适配器
    list = initData();
    adapter = new RecycleAdapter(MainActivity.this, list);
    mRecyclerView.setAdapter(adapter);
//   添加动画
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());
  }
  private void initView() {
    iv_add = (ImageView) findViewById(R.id.iv_add);
    mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
  }
  
  protected ArrayList<String> initData() {
    ArrayList<String> mDatas = new ArrayList<String>();
    for (int i = 0; i < 1; i++) {
      mDatas.add("我是商品" + i);
    }
    return mDatas;
  }
}

package com.android.qzs.qzsrecycleview;
import android.content.Context;
import android.support.design.widget.Snackbar;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
 * Created by qzs on 2017/9/04.
 */
class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> {
  private Context context;
  private List<String> list;
  public RecycleAdapter(Context context, List<String> list) {
    this.context = context;
    this.list = list;
  }
  @Override
  public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
        context).inflate(R.layout.item_home, parent,
        false));
    return holder;
  }
  @Override
  public void onBindViewHolder(MyViewHolder holder, final int position) {
    holder.tv.setText(list.get(position));
    holder.tv_delete.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        if (list.size() == 1) {
          Snackbar.make(v, "此条目不能删除", Snackbar.LENGTH_SHORT).show();
        } else {
          //        删除自带默认动画
          removeData(position);
        }
      }
    });
  }
  @Override
  public int getItemCount() {
    return list.size();
  }
  // 添加数据
  public void addData(int position) {
//   在list中添加数据，并通知条目加入一条
    list.add(position, "我是商品" + position);
    //添加动画
    notifyItemInserted(position);
  }
  // 删除数据
  public void removeData(int position) {
    list.remove(position);
    //删除动画
    notifyItemRemoved(position);
    notifyDataSetChanged();
  }
  /**
   * ViewHolder的类，用于缓存控件
   */
  class MyViewHolder extends RecyclerView.ViewHolder {
    TextView tv, tv_delete;
    //因为删除有可能会删除中间条目，然后会造成角标越界，所以必须整体刷新一下！
    public MyViewHolder(View view) {
      super(view);
      tv = (TextView) view.findViewById(R.id.id_num);
      tv_delete = (TextView) view.findViewById(R.id.tv_delete);
    }
  }
}