Android RecyclerView implements click entry deletion

public class MainActivity extends AppCompatActivity implements {

  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) {
    (savedInstanceState);
    setContentView(.activity_main);

    findViews();

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

    mAdapter = new RvAdapter(mList, this);
    (mAdapter);

    //Set the split line    (new DividerItemDecoration(this,));
    //Set the default layout    mLinearLayoutManager = new LinearLayoutManager(this, , false);
    (mLinearLayoutManager);

    (new () {
      @Override
      public void onItemClick(int position) {
        (position);
      }

      @Override
      public void onItemLongClick(int position) {

        (position);
      }
    });

  }

  private void findViews() {

    mRecyclerView = findViewById();

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

    (this);
    (this);
    (this);
    (this);
    (this);


  }

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

        (3);
        (0);
        break;
      case .b2:

        (()-1);
        break;
      case .b3:

        mLinearLayoutManager = new LinearLayoutManager(this, , false);
        (mLinearLayoutManager);
        break;
      case .b4:

        (new GridLayoutManager(this, 3));
        //(new .(this, ));

        break;
      case .b5:

        (new StaggeredGridLayoutManager(2,));
        break;
    }
  }
}

< xmlns:andro
  xmlns:app="/apk/res-auto"
  xmlns:tools="/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:
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Add to"/>
      <Button
        android:
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="delete"/>
      <Button
        android:
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="List"/>
      <Button
        android:
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Grid"/>
      <Button
        android:
        android:layout_width="wrap_content"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="flow"/>
    </LinearLayout>
    <.
      android:
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>
  </LinearLayout>

</>

public class RvAdapter extends <>{

  private List<String> lists;
  private Context mContext;

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

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

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

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

  }

  public interface OnItemClickListener{  //Custom interface callback setting click event    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) {
    ((position));

       (new () {
         @Override
         public void onClick(View view) {

           int ps = ();
           (ps);
         }
       });

       (new () {
         @Override
         public boolean onLongClick(View view) {

           int ps=();
           (ps);
           return false;
         }
       });

  }


  @Override
  public int getItemCount() {
    return ();
  }

  public static class ViewHolder extends {
    public final TextView mTextView;

    public ViewHolder(View itemView) {
      super(itemView);
      mTextView = (TextView) ();
    }
  }
}

implementation ':recyclerview-v7:27.1.1'