kotlin.UninitializedPropertyAccessException - lateinit property mAdapter has not been initialized - Android Development

I am making a news app in android but I am getting error when I call a API(http) from my app. I don't know why the error is coming I implemented all the class, memebers, function. Pleas help me.

Here is the error description

2021-01-21 09:21:25.896 18052-18052/com.arne.khabriapp E/AndroidRuntime: FATAL EXCEPTION: main  Process: com.arne.khabriapp, PID: 18052  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.arne.khabriapp/com.arne.khabriapp.MainActivity}: kotlin.UninitializedPropertyAccessException: lateinit property mAdapter has not been initialized      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)      at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)      at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)      at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)      at android.os.Handler.dispatchMessage(Handler.java:107)      at android.os.Looper.loop(Looper.java:214)      at android.app.ActivityThread.main(ActivityThread.java:7356)      at java.lang.reflect.Method.invoke(Native Method)      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)   Caused by: kotlin.UninitializedPropertyAccessException: lateinit property mAdapter has not been initialized      at com.arne.khabriapp.MainActivity.onCreate(MainActivity.kt:25)      at android.app.Activity.performCreate(Activity.java:7802)      at android.app.Activity.performCreate(Activity.java:7791)      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)       at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)       at android.os.Handler.dispatchMessage(Handler.java:107)       at android.os.Looper.loop(Looper.java:214)       at android.app.ActivityThread.main(ActivityThread.java:7356)       at java.lang.reflect.Method.invoke(Native Method)       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)   2021-01-21 09:21:25.912 18052-18090/com.arne.khabriapp D/NetworkSecurityConfig:   No Network Security Config specified, using platform default  

Here is my MainActivity.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 lateinit var  mAdapter: NewsListAdapter      override fun onCreate(savedInstanceState: Bundle?) {          super.onCreate(savedInstanceState)          setContentView(R.layout.activity_main)            val recyclerView = findViewById<RecyclerView>(R.id.rView)          recyclerView.layoutManager  = LinearLayoutManager(this)  //        recyclerView.layoutManager  = GridLayoutManager(this,12)  //        recyclerView.layoutManager   = StaggeredGridLayoutManager(15,12)           fetchData()            recyclerView.adapter = mAdapter          }        private fun fetchData() {  //        val list = ArrayList<String>()  //        for(i in 0 until 100){  //            list.add("item $i")  //        }  //        return list          val url = "https://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) {        }  }     

Here is my NewsAdapter.kt

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)  }  

Please Give Some Answer Thank you very much in advanced

https://stackoverflow.com/questions/65820989/kotlin-uninitializedpropertyaccessexception-lateinit-property-madapter-has-not January 21, 2021 at 11:58AM