fragment界面的代码，白色那行被提示错误

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

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

import com.example.adoptpet.Adapter.mainpageAdapter;
import com.example.adoptpet.R;
import com.example.adoptpet.base.BaseFragment;
import com.example.adoptpet.entiy.mainpage;
import com.example.adoptpet.utils.Datas;

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

public class FindFragment extends BaseFragment {
    private RecyclerView mlist;
    private List<mainpage> mdata;
    private mainpageAdapter mAdapter;
    private View mView;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        mView = inflater.inflate(R.layout.fragment_find, container, false);
        return mView;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        initData();
        initListener();
        mlist = (RecyclerView) this.getActivity().findViewById(R.id.recycler_view_find);
        //设置recycle的样式
        LinearLayoutManager layoutManager=new LinearLayoutManager(getActivity());
        mlist.setLayoutManager(layoutManager);
        //创建适配器
        mAdapter = new mainpageAdapter(mdata);
        //设置到recyc里去
        mlist.setAdapter(mAdapter);
    }
    private void initData(){
        //创建数据集合
        mdata = new ArrayList<>();
        //创建模拟数据
        for(int i = 0; i< Datas.headi.length; i++){
            //创建数据对象
            mainpage data=new mainpage();
            data.userName="昵称："+i;
            data.adress="地址："+i;
            data.describe="我是第"+i+"个小动物";
            data.time="时间"+i;
            data.headimageId=Datas.headi[i];
            data.petimageId=Datas.headi[i];
            //添加到集合里
            mdata.add(data);
        }

    }
    private void initListener() {

mAdapter.setOnItemClickListener(new mainpageAdapter.OnItemClickListener() {

            @Override
            public void onItemClick(int position) {
                //这里处理条目的点击事件
                Toast.makeText(getActivity(),"您点击的是第"+position+"个条目",Toast.LENGTH_SHORT).show();
            }
        });
    }


    @Override
    protected int getRootViewResId() {
        return R.layout.fragment_find;
    }

}

适配器的代码

package com.example.adoptpet.Adapter;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

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

import com.example.adoptpet.R;
import com.example.adoptpet.entiy.mainpage;

import java.util.List;

public class mainpageAdapter extends RecyclerView.Adapter<mainpageAdapter.InnerHolder> {

    private final List<mainpage> mData;
    private OnItemClickListener mOnItemClickListener;
    public mainpageAdapter(List<mainpage> data){
        this.mData=data;
    }
    //用于创建条目的view
    @NonNull
    @Override
    public InnerHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //传进这个条目的界面
        View view = View.inflate(parent.getContext(), R.layout.fragment_find, null);
        return new InnerHolder(view);
    }


//用来绑定houlder一般用来设置数据
    @Override
    public void onBindViewHolder(@NonNull InnerHolder holder, int position) {
       //在这里设置数据
        holder.setData(mData.get(position),position);
    }
//返回条目个数
    @Override
    public int getItemCount() {
        if (mData != null) {
            return mData.size();
        }
        return 0;
    }

    public void setOnItemClickListener(OnItemClickListener listener) {
        //设置一个监听其实就是设置一个接口，一个回调的接口
        this.mOnItemClickListener=listener;
    }
    /*
            编写一个回调的步骤
            1.创建这个接口
            2.定义接口的内部方法
            3.提供设置接口（其实是外部实现）
            4.接口方法的调用
             */
    public interface OnItemClickListener{
        void onItemClick(int position);
    }
    public class InnerHolder extends RecyclerView.ViewHolder {

        private  TextView  mUserName;
        private  TextView  mTime;
        private  TextView  mAddress;
        private  TextView  mDedcribe;
        private  ImageView mHeadimageId;
        private  ImageView mPetimageId;
        private int mPosotion;

        public InnerHolder(@NonNull View itemView) {
            super(itemView);
            //找到条目的控件
            mUserName = (TextView) itemView.findViewById(R.id.usernametext);
            mTime = (TextView)itemView.findViewById(R.id.timetext);
            mAddress = (TextView)itemView.findViewById(R.id.adresstext);
            mDedcribe = (TextView)itemView.findViewById(R.id.describetext);
            mHeadimageId = (ImageView) itemView.findViewById(R.id.headimageview);
            mPetimageId = (ImageView)itemView.findViewById(R.id.petimageview);
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mOnItemClickListener != null) {
                        mOnItemClickListener.onItemClick(mPosotion);
                    }
                }
            });
        }
     //这个方法用于设置数据
        public void setData(mainpage mainpage,int position) {
           this.mPosotion = position;
            mUserName.setText(mainpage.userName);
            mTime.setText(mainpage.time);
            mAddress.setText(mainpage.adress);
            mDedcribe.setText(mainpage.describe);
            mHeadimageId.setImageResource(mainpage.headimageId);
            mPetimageId.setImageResource(mainpage.petimageId);
        }
    }
}

错误提示