怎么搭建recyclerView滑动删除

package com.example.demo;
 
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.ItemTouchHelper;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
 
import android.graphics.Canvas;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
 
import java.util.ArrayList;
import java.util.List;
 
/**
 * @author Huang xudong
 * @date 2020/7/26
 */
public class MainActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
 
    private List list=new ArrayList();
 
    class MyAdpter extends RecyclerView.Adapter<MyAdpter.ViewHolder>{
 
        class ViewHolder extends RecyclerView.ViewHolder{
            private TextView textView;
            private LinearLayout linearLayout;
 
            public ViewHolder(@NonNull View itemView) {
                super(itemView);
                linearLayout=itemView.findViewById(R.id.ll_main);
                textView=itemView.findViewById(R.id.tv_main);
            }
        }
 
        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View inflate = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item_demo,parent, false);
            return new ViewHolder(inflate);
        }
 
        @Override
        public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
 
        }
 
        @Override
        public int getItemCount() {
            return list.size();
        }
    }
 
    class CallBack extends ItemTouchHelper.Callback{
        @Override
        public int getMovementFlags(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder) {
            return makeMovementFlags(0,ItemTouchHelper.LEFT);
        }
 
        @Override
        public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
            return false;
        }
 
        @Override
        public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
            /**
             * call max distance start onSwiped call
             */
        }
 
        @Override
        public void onChildDraw(@NonNull Canvas c, @NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
 
 
            if (actionState==ItemTouchHelper.ACTION_STATE_SWIPE){
                /**
                 * get {@link TextView#getWidth()}
                 */
                ViewGroup viewGroup= (ViewGroup) viewHolder.itemView;
                TextView textView = (TextView) viewGroup.getChildAt(1);
                ViewGroup.LayoutParams layoutParams = textView.getLayoutParams();
                if (Math.abs(dX)<=layoutParams.width){
                    /**
                     * move {@link RecyclerView.ViewHolder} distance
                     */
                    viewHolder.itemView.scrollTo((int) -dX,0);
                    /**
                     * callAction or register click bind view
                     */
                }
            }
        }
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        recyclerView=findViewById(R.id.rv_main);
        list.add(1);
        list.add("2");
        MyAdpter myAdpter=new MyAdpter();
        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(getApplicationContext());
        linearLayoutManager.setOrientation(RecyclerView.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setAdapter(myAdpter);
        ItemTouchHelper itemTouchHelper=new ItemTouchHelper(new CallBack());
        itemTouchHelper.attachToRecyclerView(recyclerView);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
 
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_main"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_width="0dp"
        android:layout_height="0dp">
 
    </androidx.recyclerview.widget.RecyclerView>
 
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="10dp"
    xmlns:app="http://schemas.android.com/apk/res-auto">
 
    <LinearLayout
        android:id="@+id/ll_main"
        android:background="@color/colorPrimaryDark"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:layout_width="0dp"
        android:layout_height="200dp"
        android:orientation="horizontal">
 
    </LinearLayout>
 
    <TextView
        android:textColor="#ffffff"
        android:gravity="center"
        android:id="@+id/tv_main"
        android:textSize="34sp"
        android:text="删 除"
        android:background="@color/colorAccent"
        app:layout_constraintLeft_toRightOf="@id/ll_main"
        app:layout_constraintTop_toTopOf="@id/ll_main"
        app:layout_constraintBottom_toBottomOf="@id/ll_main"
        android:layout_width="180dp"
        android:layout_height="0dp">
 
    </TextView>
 
 
 
</androidx.constraintlayout.widget.ConstraintLayout>