Volley - API 调用数据未显示在回收站视图中

Question

我正在创建一个新闻应用程序，在这个应用程序中，我通过从 Volley 库到 URL 的 API 调用获取新闻数据。

我的应用正在启动，但在视图中没有显示任何内容。

这是MainActivity.kt

for f in $(git ls-files) ; do touch -d $(git log -1 --format='%aI' "$f") "$f" ; done

这是 NewsAdapter.kt

package com.arne.khabriapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.android.volley.Request
import com.android.volley.toolbox.JsonObjectRequest


class MainActivity : AppCompatActivity(), NewsItemClicked {

    private val mAdapter: NewsListAdapter by lazy{
        NewsListAdapter(this)
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val recyclerView = findViewById<RecyclerView>(R.id.rView)
        recyclerView.layoutManager  = LinearLayoutManager(this)

        fetchData()

        recyclerView.adapter = mAdapter
    }

    private fun fetchData() {
        val url = "http://newsapi.org/v2/top-headlines?country=in&apiKey=9bb7bf6152d147ad8ba14cd0e7452f2f"
        val jsonObjectRequest = JsonObjectRequest(
            Request.Method.GET,
            url,
            null,
            {
                val newsJsonArray = it.getJSONArray("articles")
                val newsArray = ArrayList<NewsClass>()
                for (i in 0 until newsJsonArray.length()){
                    val newsJsonObject = newsJsonArray.getJSONObject(i)
                    val news =NewsClass(
                        newsJsonObject.getString("title"),
                        newsJsonObject.getString("author"),
                        newsJsonObject.getString("url"),
                        newsJsonObject.getString("urlToImage")
                    )
                    newsArray.add(news)
                }
                mAdapter.updateNews(newsArray)
            },
            {
            }
        )
        MySingletonClass.getInstance(this).addRequestQueue(jsonObjectRequest)
    }

    override fun OnItemClick(item: NewsClass) {
    }
}

这是 Logcat 没有显示任何错误，但我不知道为什么会出现此错误 -

package com.arne.khabriapp

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

//class Name: extendItForRecyclerView.Adapter<ViewHolderClass>
class NewsListAdapter( private val listener: NewsItemClicked): RecyclerView.Adapter<NewsViewHolder>()
{

    private val items: ArrayList<NewsClass> = ArrayList()
//    call me when each time one viewholder is created
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NewsViewHolder {

    //Layout Inflater  - Converts XML into View
    val view = LayoutInflater.from(parent.context).inflate(R.layout.itemnews, parent, false)

    val viewHolder = NewsViewHolder(view)
    view.setOnClickListener{
        //this is a call back to main activity so the main activity knows that any item is clicked and then the mainn activity behave according to this.
        listener.OnItemClick(items[viewHolder.adapterPosition])
        
    }
        return viewHolder
    }

    //    I will bind the item with viewholder
    override fun onBindViewHolder(holder: NewsViewHolder, position: Int) {
        val currentItem = items[position]
        holder.titleView.text = currentItem.title
    }

//    call me only one time i will give you how many item will be here in list
    override fun getItemCount(): Int {
        return items.size
    }

    fun updateNews(updatedNews: ArrayList<NewsClass>){
        items.clear()
        items.addAll(updatedNews)

        notifyDataSetChanged()
    }
}
class NewsViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
    val titleView: TextView = itemView.findViewById(R.id.title)
}

interface NewsItemClicked{
    fun OnItemClick(item: NewsClass)
}