public class MainActivity extends AppCompatActivity implements View.OnClickListener{

  private Button mButton1;
  private Button mButton2;
  private Button mButton3;
  private Button mButton4;
  private Button mButton5;
  private RecyclerView mRecyclerView;
  private ArrayList<String> mList;
  private LinearLayoutManager mLinearLayoutManager;
  private RvAdapter mAdapter;


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    findViews();

    mList = new ArrayList<>();
    for (int i=0;i<20;i++){
      mList.add(i+"item");
    }

    mAdapter = new RvAdapter(mList, this);
    mRecyclerView.setAdapter(mAdapter);

    //設置分割線
    mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
    //設置默認布局
    mLinearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
    mRecyclerView.setLayoutManager(mLinearLayoutManager);

    mAdapter.setOnItemClickListener(new RvAdapter.OnItemClickListener() {
      @Override
      public void onItemClick(int position) {
        mAdapter.remove(position);
      }

      @Override
      public void onItemLongClick(int position) {

        mAdapter.remove(position);
      }
    });

  }

  private void findViews() {

    mRecyclerView = findViewById(R.id.rv);

    mButton1= findViewById(R.id.b1);
    mButton2= findViewById(R.id.b2);
    mButton3= findViewById(R.id.b3);
    mButton4= findViewById(R.id.b4);
    mButton5= findViewById(R.id.b5);

    mButton1.setOnClickListener(this);
    mButton2.setOnClickListener(this);
    mButton3.setOnClickListener(this);
    mButton4.setOnClickListener(this);
    mButton5.setOnClickListener(this);


  }

  @Override
  public void onClick(View view) {
    switch (view.getId()){
      case R.id.b1:

        mAdapter.addData(3);
        mRecyclerView.scrollToPosition(0);
        break;
      case R.id.b2:

        mAdapter.remove(mList.size()-1);
        break;
      case R.id.b3:

        mLinearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        mRecyclerView.setLayoutManager(mLinearLayoutManager);
        break;
      case R.id.b4:

        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
        //mRecyclerView.addItemDecoration(new android.support.v7.widget.DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL));

        break;
      case R.id.b5:

        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
        break;
    }
  }
}

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity">

  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal">
      <Button
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="添加"/>
      <Button
        android:id="@+id/b2"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="刪除"/>
      <Button
        android:id="@+id/b3"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="List"/>
      <Button
        android:id="@+id/b4"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Grid"/>
      <Button
        android:id="@+id/b5"
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="flow"/>
    </LinearLayout>
    <android.support.v7.widget.RecyclerView
      android:id="@+id/rv"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>
  </LinearLayout>

</android.support.constraint.ConstraintLayout>

public class RvAdapter extends RecyclerView.Adapter<RvAdapter.ViewHolder>{

  private List<String> lists;
  private Context mContext;

  public RvAdapter(List<String> lists, Context context) {
    this.lists = lists;
    mContext = context;
  }

  @Override
  public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = View.inflate(mContext, R.layout.item, null);
    ViewHolder holder = new ViewHolder(view);
    return holder;
  }

  public void addData(int position) {
    lists.add(position,"ff");
    notifyItemInserted(position);
  }

  public void remove(int i) {
    lists.remove(i);
    notifyItemRemoved(i);
    notifyDataSetChanged();

  }

  public interface OnItemClickListener{  //自定義接口回調設置點擊事件
    void onItemClick(int position);
    void onItemLongClick(int position);
  }

  private OnItemClickListener mOnItemClickListener;

  public void setOnItemClickListener(OnItemClickListener onItemClickListener){
    mOnItemClickListener=onItemClickListener;
  }

  @Override
  public void onBindViewHolder(final ViewHolder holder, final int position) {
    holder.mTextView.setText(lists.get(position));

       holder.itemView.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View view) {

           int ps = holder.getLayoutPosition();
           mOnItemClickListener.onItemClick(ps);
         }
       });

       holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
         @Override
         public boolean onLongClick(View view) {

           int ps=holder.getLayoutPosition();
           mOnItemClickListener.onItemLongClick(ps);
           return false;
         }
       });

  }


  @Override
  public int getItemCount() {
    return lists.size();
  }

  public static class ViewHolder extends RecyclerView.ViewHolder{
    public final TextView mTextView;

    public ViewHolder(View itemView) {
      super(itemView);
      mTextView = (TextView) itemView.findViewById(R.id.tv);
    }
  }
}

implementation 'com.android.support:recyclerview-v7:27.1.1'