RecyclerView：没有附加适配器；在适配器中创建充气器时跳过布局应用程序关闭

Question

正在尝试创建 RecyclerView 并在 Fragment 中使用 Retrofit2 填充数据但是当我运行应用程序并转到该片段时它会关闭，

当我在适配器的 onCreateViewHolder

的以下行中调试应用程序关闭时

LayoutInflater inflater = LayoutInflater.from( context );

出现以下错误

RecyclerView: No adapter attached; skipping layout
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference

以下是片段的代码

ApiConfig apiConfig = AppConfig.getRetrofit().create(ApiConfig.class);
            Call<List<TCImages>> call = apiConfig.getImages();
            call.enqueue( new Callback<List<TCImages>>() {
                @Override
                public void onResponse(Call<List<TCImages>> call, Response<List<TCImages>> response) {
                    tcImages = response.body();

                    recyclerView = (RecyclerView) getView().findViewById( R.id.recyclerView );
                    manager = new LinearLayout( getContext() );
                    tcAdapter = new TCAdapter( tcImages, getActivity() );
                    recyclerView.setAdapter( tcAdapter );
                    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
                }

                @Override
                public void onFailure(Call<List<TCImages>> call, Throwable t) {

                }
            } );

下面是我的适配器代码

package com.example.tc;


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

import com.example.tc.networking.TCImages;

import java.util.List;

import androidx.annotation.NonNull;
import androidx.fragment.app.FragmentActivity;
import androidx.recyclerview.widget.RecyclerView;


public class TCAdapter extends RecyclerView.Adapter<TCAdapter.MyViewHolder> {

    List<TCImages> tcImages;
    Context context;

    public TCAdapter(List<TCImages> tcImages, FragmentActivity activity){
        this.tcImages = tcImages;
    }

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

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.textView.setText( tcImages.get( position ).getEmail() );

    }

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

    public class MyViewHolder extends RecyclerView.ViewHolder {
        TextView textView;
        public MyViewHolder(@NonNull View itemView) {
            super( itemView );
            textView = (TextView) itemView.findViewById( R.id.txtItem );
        }
    }
}

我正处于学习阶段，我正在获取 Activity 的代码，我正在将它们转换为 Fragment。

Answer 1

从父级获取上下文。

 View view = LayoutInflater.from(parent.context).inflate(R.layout.car_row_layout, parent, false)

或者在适配器构造函数中从片段或activity传递上下文，你只是声明上下文而不是初始化有问题

List<TCImages> tcImages;
    Context context;

    public TCAdapter(List<TCImages> tcImages, FragmentActivity activity){
        this.tcImages = tcImages;
    }

Answer 2

您是否为 Context context; 设置过值？

可能您想这样做：

public TCAdapter(List<TCImages> tcImages, Context context){
        this.tcImages = tcImages;
        this.context = context;
}

RecyclerView：没有附加适配器；在适配器中创建充气器时跳过布局应用程序关闭

RecyclerView: No adapter attached; skipping layout App closing when it is creating inflater in Adapter

android

android-adapter

retrofit

android-recyclerview