这个错误很奇怪，先记录下来，

错误信息如下，

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.spacesoftwares.myapplication3, PID: 11575
java.lang.IllegalStateException: ViewHolder views must not be attached when created. Ensure that you are not passing 'true' to the attachToRoot parameter of LayoutInflater.inflate(..., boolean attachToRoot)
    at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6687)
    at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5869)
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
    at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
    at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559)
    at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
    at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
    at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
    at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3225)

解决方案在stackoverflow上面【1】，毕竟我的源码和人家源码不一样，我贴出来，全文如下，

package com.spacesoftwares.myapplication3.MyRecyclerView;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.spacesoftwares.myapplication3.R;

import org.w3c.dom.Text;

import java.util.List;


public class LinearAdaptor extends RecyclerView.Adapter<LinearAdaptor.LinearViewHolder> {

    private Context mContext;

    public LinearAdaptor(Context context){
        this.mContext = context;
    }

    @NonNull
    @Override
    public LinearAdaptor.LinearViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //return new LinearViewHolder(LayoutInflater.from(mContext).inflate(R.layout.layout_linear_item, parent));
        View view = LayoutInflater.from(mContext).inflate(R.layout.layout_linear_item, parent, false);
        return new LinearViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull LinearAdaptor.LinearViewHolder holder, int position) {
        holder.textView.setText("LinearViewHolder");
    }

    @Override
    public int getItemCount() {
        return 20;
    }

    class LinearViewHolder extends  RecyclerView.ViewHolder{
        private TextView textView;
        public LinearViewHolder(View itemView){
            super(itemView);
            textView = itemView.findViewById(R.id.li_title);
        }
    }
}

报错的部分在这里，

 //return new LinearViewHolder(LayoutInflater.from(mContext).inflate(R.layout.layout_linear_item, parent));

我改写成下面的形式，就没有报错了，主要是inflate后面加了一个false，如下
View view = LayoutInflater.from(mContext).inflate(R.layout.layout_linear_item, parent, false);
return new LinearViewHolder(view);

【1】https://stackoverflow.com/questions/50655791/a-difficulty-with-recyclerview-adapter-after-update-to-api-27