RecyclerView实现滑动和删除事件的监听方法

悠悠 2022-07-15 00:53 245阅读 0赞

调用方法是activity：

package com.example.cuboo.mlcircles.view;
    
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.support.v7.widget.helper.ItemTouchHelper;
    import com.example.cuboo.mlcircles.R;
    import com.example.cuboo.mlcircles.adapter.mAdapter_recycler_remove;
    import com.example.cuboo.mlcircles.api.ItemTouchHelper_Callback;
    import com.example.cuboo.mlcircles.data.Data_Map;
    import java.util.ArrayList;
    
    /*
     *recyclerview中删除移动item
     */
    public class RecyclerView_remove extends AppCompatActivity {
        private RecyclerView mRecycler_view;
        private mAdapter_recycler_remove mAdapter;
        private RecyclerView.LayoutManager mLayoutManager;
        private ArrayList<Data_Map> mlist;
        private Data_Map data_map;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.cardview);
            init_data();
            mRecycler_view = (RecyclerView) findViewById(R.id.my_recycler_view);
            //设置固定大小
            mRecycler_view.setHasFixedSize(false);
            //使用线性布局
            mLayoutManager = new LinearLayoutManager(this);
            mRecycler_view.setLayoutManager(mLayoutManager);
    
            //添加适配器
            mAdapter = new mAdapter_recycler_remove(mlist);
            mRecycler_view.setAdapter(mAdapter);
    
            //设置滑动、删除
            ItemTouchHelper.Callback callback = new ItemTouchHelper_Callback(mAdapter);
            ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
            itemTouchHelper.attachToRecyclerView(mRecycler_view);
    
        }
        //初始化数据
        private void init_data(){
            mlist = new ArrayList<Data_Map>();
            for (int i = 0;i<5;i++){
                data_map = new Data_Map();
                data_map.setmTitle("CardView Title "+i);
                data_map.setmContent("Cardview Content "+i);
                //获取资源id
                int id = getResources().getIdentifier("img_view"+i,"drawable",getPackageName());
                data_map.setmImgID(id);
                mlist.add(data_map);
            }
        }
    }

实现的Adapter:

package com.example.cuboo.mlcircles.adapter;
    
    import android.support.v7.widget.RecyclerView;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import com.example.cuboo.mlcircles.R;
    import com.example.cuboo.mlcircles.api.ItemTouchHelperInterface;
    import com.example.cuboo.mlcircles.data.Data_Map;
    import com.example.cuboo.mlcircles.data.ItemData;
    
    import java.util.ArrayList;
    import java.util.Collections;
    
    /**
     * Created by cuboo on 2016/9/19.
     */
    public class mAdapter_recycler_remove
            extends RecyclerView.Adapter <mAdapter_recycler_remove.MyHolder>
            implements View.OnClickListener, View.OnLongClickListener,ItemTouchHelperInterface {
    
        private ArrayList<ItemData> mItemData;
        //接口回调步骤2：定义成员变量
        private MyOnClickListener myOnClickListener;
        private MyOnLongClickListener myOnLongClickListener;
    
    
       //构造器参数为自定义数据类
       public mAdapter_recycler_remove(ArrayList<ItemData> itemData){
            mItemData = itemData;
        }
    
        //自定义holder类为每一个数据项提供视图和在holder中为数据项提供数据
       public static class MyHolder extends RecyclerView.ViewHolder{
            private TextView mTitle;
            private LinearLayout mLinearLayout;
    
            public MyHolder(View itemView) {
                super(itemView);
                //获得id
                mTitle = (TextView) itemView.findViewById(R.id.info_text);
                mLinearLayout = (LinearLayout) itemView.findViewById(R.id.my_card_view);
            }
            public TextView getmTitle() {
                return mTitle;
            }
    
            public LinearLayout getmLinearLayout() {
                return mLinearLayout;
            }
        }
    
        @Override
        public MyHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            //获得自定义布局文件id
            View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.cardview,viewGroup,false);
            MyHolder vh = new MyHolder(view);
            //在onCreateViewHolder()中为每个item添加点击事件
            view.setOnClickListener(this);
            view.setOnLongClickListener(this);
            return vh;
        }
    
        @Override
        public void onBindViewHolder(MyHolder myHolder, int i) {
            //设置数据
                 //myHolder.getmTitle().setText(mItemData.get(i).getmTitle());
                 //myHolder.getmLinearLayout().setBackgroundResource(mItemData.get(i).getmImgID());
            //将数据保存在itemView的Id中，以便点击时进行获取
            myHolder.itemView.setId(i);
        }
    
        @Override
        public int getItemCount() {
            // Return the size of your dataset (invoked by the layout manager)
            System.out.println(mItemData.size());
            return mItemData.size();
    
        }
    
        //接口回调步骤1：定义监听接口
        public static interface MyOnClickListener{
            public void OnItemClickListener(View view, int position);
        }
        public static interface MyOnLongClickListener{
            public void OnItemLongClickListener(View view, int position);
        }
    
        //接口回调步骤4：实现接口回调方法
        @Override
        public void onClick(View view) {
            if (myOnClickListener != null){
                myOnClickListener.OnItemClickListener(view, view.getId());
            }
        }
        @Override
        public boolean onLongClick(View view) {
            if (myOnLongClickListener != null){
                myOnLongClickListener.OnItemLongClickListener(view,view.getId());
            }
            return true;
        }
        //接口回调步骤3：实例化
        public void setOnClickListener(MyOnClickListener listener){
            this.myOnClickListener = listener;
        }
        public void setOnLongClickListener(MyOnLongClickListener listener){
            this.myOnLongClickListener = listener;
        }
    
        //实现移动和删除 ItemTouchHelperInterface接口调用方法
        @Override
        public void onItemMove(int fromPosition, int toPosition) {
            Collections.swap(mItemData,fromPosition,toPosition);
            notifyItemMoved(fromPosition, toPosition);
        }
    
        @Override
        public void onItemDismiss(int position) {
            mItemData.remove(position);
            notifyItemRemoved(position);
        }
    }

定义的接口：

package com.example.cuboo.mlcircles.api;
    
    /**
     * Created by cuboo on 2016/9/4.
     */
    public interface ItemTouchHelperInterface {
        void onItemMove(int fromPosition, int toPosition);
        void onItemDismiss(int position);
    }

实现移动和删除的接口回调方法类：

package com.example.cuboo.mlcircles.api;
    
    import android.support.v7.widget.RecyclerView;
    import android.support.v7.widget.helper.ItemTouchHelper;
    import com.example.cuboo.mlcircles.adapter.mAdapter_recycler_remove;
    
    /**
     * Created by cuboo on 2016/9/19.
     * recyclerview中的移动删除item
     */
    public class ItemTouchHelper_Callback extends ItemTouchHelper.Callback {
         private final mAdapter_recycler_remove myAdapter;
    
        public ItemTouchHelper_Callback( mAdapter_recycler_remove myAdapter) {
            this.myAdapter = myAdapter;
        }
    
        @Override
        public boolean isItemViewSwipeEnabled() {
            return true;
        }
    
        @Override
        public boolean isLongPressDragEnabled() {
            return true;
        }
    
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            int dragFlaps = ItemTouchHelper.UP|ItemTouchHelper.DOWN|ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT;
            int swipFlags = ItemTouchHelper.START|ItemTouchHelper.END;
            return makeMovementFlags(dragFlaps,swipFlags);
        }
    
        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder viewHolder1) {
            myAdapter.onItemMove(viewHolder.getAdapterPosition(),viewHolder1.getAdapterPosition());
            return true;
        }
    
        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
            myAdapter.onItemDismiss(viewHolder.getAdapterPosition());
        }
    }