RecyclerView or ListView (list) click on an item to keep it selected [very clever]

Background:
I wanted to use selectors to implement it, but the results didn't work

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/holo_orange_dark" android:state_selected="true" />
    <item android:drawable="@color/holo_orange_dark" android:state_pressed="true" />
    <item android:drawable="@color/holo_orange_dark" android:state_checked="true" />
    <item android:drawable="@color/holo_orange_dark" android:state_focused="true" />
    <item android:drawable="@color/no_white" android:state_focused="false" />
    <item android:drawable="@color/no_white" android:state_selected="false" />

</selector>

Implementation idea:
add the setThisPosition method in the adapter to locate the click item, and call notifyDataSetChanged(); automatically execute the getView method of the adapter once, that is, to judge and display the pressed state; when executing the click monitor, execute the setThisPosition(position) of the adapter once It is very clever to pass the position in the method.

The core adds the setThisPosition method in the Adapter implementation 1dapter

   //先声明一个int成员变量,若为0默认显示第一个
    private int thisPosition = -1;

    //再定义一个int类型的返回值方法
    public int getthisPosition() {
        return thisPosition;
    }

    //其次定义一个方法用来绑定当前参数值的方法
    //此方法是在调用此适配器的地方调用的，此适配器内不会被调用到
    public void setThisPosition(int thisPosition) {
        this.thisPosition = thisPosition;
//        执行构造器的getView方法
        notifyDataSetChanged();
    }

2 In the getView callback method, the status judgment of click or not is carried out

if (position == getthisPosition()) {
//            Log.e("wy", "onBindViewHolder: ");
//            viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);
            viewHolder.itemView.setBackgroundResource(R.drawable.top_checked);
        } else {
            viewHolder.itemView.setBackgroundResource(R.drawable.top_normal);
        }

3 listview click listener to execute mAdapter.setThisPosition(position); trigger everything

 LvServiceCustomDetailAdapter lvServiceCustomDetailAdapter = new LvServiceCustomDetailAdapter(professionInfo.getData(), ServiceCustomDetailActivity.this);
                    lvServiceCustomDetail.setAdapter(lvServiceCustomDetailAdapter);
                    lvServiceCustomDetail.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                            lvServiceCustomDetailAdapter.setThisPosition(position);
        }
                    });

Adapter full code

package com.wintec.huashang.adapter;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.wintec.huashang.Constant;
import com.wintec.huashang.R;

import java.util.List;

import androidx.recyclerview.widget.RecyclerView;

public class GalleryAdapter extends
        RecyclerView.Adapter<GalleryAdapter.ViewHolder> {
    public interface OnItemClickLitener {
        void onItemClick(View view, int position);
    }

    private OnItemClickLitener mOnItemClickLitener;

    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener) {
        this.mOnItemClickLitener = mOnItemClickLitener;
    }

    ViewHolder viewHolder;
    private LayoutInflater mInflater;
    private List<String> mDatas;
    Context mContext;

    //    private int selectedPosition = -5; //默认一个参数
    public GalleryAdapter(Context context, List<String> datats) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        mDatas = datats;
    }

    //先声明一个int成员变量,若为0默认显示第一个
    private int thisPosition = -1;

    //再定义一个int类型的返回值方法
    public int getthisPosition() {
        return thisPosition;
    }

    //其次定义一个方法用来绑定当前参数值的方法
    //此方法是在调用此适配器的地方调用的，此适配器内不会被调用到
    public void setThisPosition(int thisPosition) {
        this.thisPosition = thisPosition;
        notifyDataSetChanged();
    }

//    int a = -1;
//    public void setSelectFlag(int flag){
//        if (flag==a) {
//            return;
//        }
//        a = flag;
//        notifyDataSetChanged();
//    }


    public static class ViewHolder extends RecyclerView.ViewHolder {
        public ViewHolder(View arg0) {
            super(arg0);
        }

        ImageView mImg;
        TextView mTxt;
        RelativeLayout mRecyclerRl;


    }


    public void setmDatas(List<String> datas) {
        //        清除ReclyclerView条目选中状态
        thisPosition = -1;
        if (mDatas != null) {
            mDatas.clear();
            this.notifyDataSetChanged();
        }
        mDatas.addAll(datas);
//        selectedPosition = -5;
        this.notifyDataSetChanged();
    }

    public void clearnChecked() {
        viewHolder.mRecyclerRl.setFocusable(false);
        viewHolder.mRecyclerRl.clearFocus();
        viewHolder.itemView.setBackgroundResource(R.color.white);
//        selectedPosition = -5;
//        清除ReclyclerView条目选中状态
        thisPosition = -1;
        this.notifyDataSetChanged();
    }


    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    /**
     * 创建ViewHolder
     */
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = mInflater.inflate(R.layout.activity_index_gallery_item,
                viewGroup, false);
//        ViewHolder viewHolder = new ViewHolder(view);
        viewHolder = new ViewHolder(view);

//        if (!listItem.isSelect()){
//            viewHolder.relativeLayout.setBackgroundColor(Color.WHITE);
//        }else {
//            viewHolder.relativeLayout.setBackgroundColor(Color.parseColor("#ff00ff"));
//        }


//        viewHolder.mImg = (ImageView) view
//                .findViewById(R.id.id_index_gallery_item_image);
        viewHolder.mTxt = (TextView) view
                .findViewById(R.id.id_index_gallery_item_text);
        viewHolder.mRecyclerRl = (RelativeLayout) view.findViewById(R.id.recycler_rl);
        return viewHolder;
    }

    /**
     * 设置值
     */
    @Override
    public void onBindViewHolder(final ViewHolder viewHolder, final int position) {

//        Log.e("wy", "onBindViewHolder: " + position+"getthisPosition(): "+getthisPosition());
        if (position == getthisPosition()) {
//            Log.e("wy", "onBindViewHolder: ");
//            viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);
            viewHolder.itemView.setBackgroundResource(R.drawable.top_checked);
        } else {
            viewHolder.itemView.setBackgroundResource(R.drawable.top_normal);
        }

//        viewHolder.mImg.setImageResource(mDatas.get(position));

//        viewHolder.itemView.setSelected(selectedPosition == position);
//        if (selectedPosition == position) {
//            viewHolder.mTxt.setVisibility(View.VISIBLE);
//        } else {
//            viewHolder.mTxt.setVisibility(View.INVISIBLE);
//        }

        viewHolder.mTxt.setText(mDatas.get(position) + "");
//        viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
//            @Override
//            public void onClick(final View v) {
//                Toast.makeText(mContext, "点击的位置："+position +"点击的内容： "+mDatas.get(position), Toast.LENGTH_SHORT).show();
//
//            }
//        });
        //如果设置了回调，则设置点击事件
        if (mOnItemClickLitener != null) {
//按下选中
//            viewHolder.itemView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
//                @Override
//                public void onFocusChange(View v, boolean hasFocus) {
//                    // TODO: 20/4/26
//                    mOnItemClickLitener.onItemClick(viewHolder.itemView, position);
//                }
//            });

            viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mOnItemClickLitener.onItemClick(viewHolder.itemView, position);
                    Log.e("wy", "run: " + "点击了ReclycerView条目");
                    Constant.isUpLoadErrorListReclyclerView = true;
//                    setSelectFlag(position);
//                    ListItem listItem = this.getData().get(position);

                }
            });


//            if(a != -1&& position == a){
                viewHolder.itemView.setSelected(true);
//
//                viewHolder.itemView.setBackgroundResource(R.color.yellow_ui);
//            }


        }


    }

}

transfer

//得到控件
        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview_horizontal);
        //设置布局管理器
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
        mRecyclerView.setLayoutManager(linearLayoutManager);
        //设置适配器
        mAdapter = new GalleryAdapter(this, mDatas);
        mAdapter.setOnItemClickLitener(new GalleryAdapter.OnItemClickLitener() {
            @Override
            public void onItemClick(View view, int position) {
                mAdapter.setThisPosition(position);


            }
        });


        mRecyclerView.setAdapter(mAdapter);