android开发分享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="https://schemas.android.com/apk/res/android"     xmlns:app="https://schemas.android.com/apk/res-auto"     xmlns:tools="https://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="https://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:paddingBottom="10dp"     xmlns:app="https://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>