点击横向recyclerView条目选中

implementation ‘androidx.recyclerview:recyclerview:1.1.0’

核心代码

adapter内

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

//   传入点击的位置
    public void setThisPosition(int thisPosition) {
        this.thisPosition = thisPosition;
        notifyDataSetChanged();
    }

 @NonNull
    @Override
    public void onBindViewHolder(HomeAdapter.MyViewHolder holder, int position) {

        Log.e("wy", "104onBindViewHolder: " );
        if(position==getthisPosition()){
            holder.tv.setBackgroundResource(R.drawable.ok);
        }else {
            holder.tv.setBackgroundResource(R.drawable.room1);
        }


        holder.tv.setText(objects.get(position).getRoomName());
        holder.itemView.setonClickListener(new View.onClickListener()
        {
            @Override
            public void onClick(View v)
            {
                int pos = holder.getLayoutPosition();
                mOnItemClickLitener.onItemClick(holder.itemView, pos);
            }
        });


    }

全代码

DeviceRoomBean loginResponse = new Gson().fromJson(result, DeviceRoomBean.class);
                mDatas = loginResponse.getData();
                Log.e("wy", "initdata: "+mDatas.get(1).getRoomName()+" getRoomId:" +mDatas.get(1).getRoomId());
                Log.e("wy", "initdata: "+mDatas.get(1).getRoomName()+" getRoomId:" +mDatas.get(2).getRoomId());
                HomeAdapter homeAdapter = new HomeAdapter(MainActivity.this, mDatas);
                mRecyclerView.setAdapter(homeAdapter);
//                mRecyclerView.setonClickListener(new View.onClickListener() {
//                    @Override
//                    public void onClick(View view) {
//                        Log.e("wy", "405onClick: ");
//                        replaceFragment(R.id.areafragmentlayout, new LabAreaSZWFragment());
//                    }
//                });

                homeAdapter.setonItemClickLitener(new HomeAdapter.onItemClickLitener() {
                    @Override
                    public void onItemClick(View view, int position) {
                        Log.e("wy", "405onClick: "+mDatas.get(position).getRoomId()+" position:"+position);
                        homeAdapter.setThisPosition(position);
                        replaceFragment(R.id.areafragmentlayout, new LabAreaSZWFragment(mDatas.get(position).getRoomId()+""));
                    }

                    @Override
                    public void onItemLongClick(View view, int position) {

                    }
                });

package com.bainuosoft.wlimsapp.adapter;

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

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.bainuosoft.wlimsapp.R;
import com.bainuosoft.wlimsapp.activity.MainActivity;
import com.bainuosoft.wlimsapp.model.DeviceRoomBean;

import java.util.ArrayList;
import java.util.List;

public class HomeAdapter extends RecyclerView.Adapter {

    private Context context;
    private LayoutInflater layoutInflater;
    private List objects = new ArrayList();



    //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;
    }

//   传入点击的位置
    public void setThisPosition(int thisPosition) {
        this.thisPosition = thisPosition;
        notifyDataSetChanged();
    }



    public HomeAdapter(Context context, List objects) {
        super();
        this.context = context;
        this.layoutInflater = LayoutInflater.from(context);
        this.objects = objects;
    }


    public interface onItemClickLitener
    {
        void onItemClick(View view, int position);
        void onItemLongClick(View view , int position);
    }

    private HomeAdapter.onItemClickLitener mOnItemClickLitener;

    public void setonItemClickLitener(HomeAdapter.onItemClickLitener mOnItemClickLitener)
    {
        this.monItemClickLitener = mOnItemClickLitener;
    }


    @NonNull
    @Override
    public HomeAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//        HomeAdapter.MyViewHolder holder = new HomeAdapter.MyViewHolder(LayoutInflater.from(
//                this).inflate(R.layout.item_home, parent,
//                false));
        View view = LayoutInflater.from(context).inflate(R.layout.item_home, parent, false);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    @NonNull
    @Override
    public void onBindViewHolder(HomeAdapter.MyViewHolder holder, int position) {

        Log.e("wy", "104onBindViewHolder: " );
        if(position==getthisPosition()){
            holder.tv.setBackgroundResource(R.drawable.ok);
        }else {
            holder.tv.setBackgroundResource(R.drawable.room1);
        }


        holder.tv.setText(objects.get(position).getRoomName());
        holder.itemView.setonClickListener(new View.onClickListener()
        {
            @Override
            public void onClick(View v)
            {
                int pos = holder.getLayoutPosition();
                mOnItemClickLitener.onItemClick(holder.itemView, pos);
            }
        });


    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.id_num);
        }
    }
}