Android RecyclerView实现滑动删除
本文实例为大家分享了RecyclerView实现滑动删除的具体代码,供大家参考,具体内容如下
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>
效果图:
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