i have been facing this issue from 3-4 days and i still can't resolve this error. i have also gone through this a solution of the same problem
but i didn't understand enough. i got that, that this error occurs when we didn't attach our adapter but i have attached. below i have attached my fragment file, adapter file and RecyclerView file-
this is a code where i declared my adapter
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.example.chumonsuru.R
import com.example.chumonsuru.model.Resturant
import com.squareup.picasso.Picasso
class DashboardRecyclerAdapter(val context : Context , val resturantInfoList : ArrayList<Resturant>) : RecyclerView.Adapter<DashboardRecyclerAdapter.DashboardViewHolder>(){
class DashboardViewHolder(view:View): RecyclerView.ViewHolder(view){
val txtResturantid : TextView = view.findViewById(R.id.txtResturantid)
val txtResturantName : TextView = view.findViewById(R.id.txtResturantName)
val txtPerPrice : TextView = view.findViewById(R.id.txtPerPrice)
val txtResturantRating : TextView = view.findViewById(R.id.txtResturantRating)
val imgResturantImage : ImageView = view.findViewById(R.id.imgResturantImage)
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DashboardViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.recycler_dashboard_row_one , parent , false)
return DashboardViewHolder(view)
}
override fun getItemCount(): Int {
return resturantInfoList.count()
}
override fun onBindViewHolder(holder: DashboardViewHolder, position: Int) {
val resturant = resturantInfoList[position]
holder.txtResturantid.text = resturant.id
holder.txtResturantName.text = resturant.name
holder.txtPerPrice.text = resturant.cost_for_one
holder.txtResturantRating.text = resturant.rating
Picasso.get().load(resturant.image_url).into(holder.imgResturantImage)
}
}
and here is my dashboard fragment file-
import android.content.Context
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.DividerItemDecoration
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.android.volley.Request
import com.android.volley.Response
import com.android.volley.toolbox.JsonObjectRequest
import com.android.volley.toolbox.Volley
import com.example.chumonsuru.R
import com.example.chumonsuru.adapter.DashboardRecyclerAdapter
import com.example.chumonsuru.model.Resturant
import kotlin.collections.HashMap
class DashFrag : Fragment() {
lateinit var recyclerView: RecyclerView
lateinit var linearLayoutManager: LinearLayoutManager
lateinit var recyclerAdapter: DashboardRecyclerAdapter
val resturantInfoList = arrayListOf<Resturant>()
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.dash_frag, container, false)
linearLayoutManager = LinearLayoutManager(activity)
recyclerView = view.findViewById(R.id.recyclerView)
val queue = Volley.newRequestQueue(activity as Context)
val url = "http://13.235.250.119/v1/book/fetch_books/"
val jsonObjectRequest = object : JsonObjectRequest(Request.Method.GET, url, null, Response.Listener {
val success = it.getBoolean("success")
if (success != null) {
val data = it.getJSONArray("data")
for (i in 0 until data.length()) {
val resturantJsonObject = data.getJSONObject(i)
val resturantObject = Resturant(
resturantJsonObject.getString("id"),
resturantJsonObject.getString("name"),
resturantJsonObject.getString("rating"),
resturantJsonObject.getString("cost_for_one"),
resturantJsonObject.getString("image_url")
)
resturantInfoList.add(resturantObject)
recyclerAdapter = DashboardRecyclerAdapter(activity as Context, resturantInfoList)
recyclerView.adapter = recyclerAdapter
recyclerView.layoutManager = linearLayoutManager
recyclerView.addItemDecoration(DividerItemDecoration(recyclerView.context,
(linearLayoutManager)
.orientation))
}
}
},
Response.ErrorListener {
/////ERROR/////
}) {
override fun getHeaders(): MutableMap<String, String> {
val headers = HashMap<String, String>()
headers["Content-type"] = "application/json"
headers["token"] = "xyz"
return headers
}
}
queue.add(jsonObjectRequest)
return view
}
}
and my restaurant class-
data class Resturant(
val id: String,
val name: String,
val rating: String,
val cost_for_one : String,
val image_url: String
)
my dashboard fragment xml file-
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.DashFrag">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="@+id/txtHelloFrag"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/hello_blank_fragment"
android:textSize="50sp"
android:textColor="@color/colorAccent"
android:padding="20dp"
android:background="@drawable/gradient"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/txtHelloFrag"
android:layout_margin="10dp"
android:padding="5dp"
/>
</RelativeLayout>
and the layout of the row of the recycler view
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="140dp"
android:orientation="horizontal"
android:background="#ffffff"
android:weightSum="6">
<ImageView
android:layout_weight="1.5"
android:id="@+id/imgResturantImage"
android:layout_width="0dp"
android:layout_height="110dp"
android:src="@mipmap/ic_launcher1"
android:padding="5dp"/>
<RelativeLayout
android:layout_weight="3.3"
android:layout_width="0dp"
android:layout_height="match_parent">
<TextView
android:padding="8dp"
android:id="@+id/txtResturantid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="id"
android:layout_toLeftOf="@id/txtResturantName"
android:textSize = "18sp"
/>
<TextView
android:id="@+id/txtResturantName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Name of the Resturant"
android:paddingTop="8dp"
android:textSize="18sp"
android:textColor="#000000"/>
<TextView
android:id="@+id/txtBookAuthor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/txtResturantName"
android:text="Name of the Author"
android:padding="8dp"
android:textSize="15sp"/>
<TextView
android:id="@+id/txtPerPrice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="Rs. 299"
android:paddingTop="8dp"
android:paddingLeft="8dp"
android:layout_below="@id/txtBookAuthor"
android:textSize="15sp"
android:textStyle="bold"
android:textColor="#357a38"/>
<TextView
android:id="@+id/txtPerPerson"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="/person"
android:layout_toRightOf="@id/txtPerPrice"
android:textSize="15sp"
android:layout_below="@id/txtBookAuthor"
android:textColor="#357a38"
android:paddingTop="8dp"
android:textStyle="bold"/>
</RelativeLayout>
<TextView
android:id="@+id/txtResturantRating"
android:layout_weight="1.2"
android:layout_width="0dp"
android:padding="6dp"
android:layout_height="wrap_content"
android:drawableLeft="@drawable/star_foreground"
android:textColor="#ffca28"
android:text="4.5"
android:textSize="15sp"
android:textStyle="bold">
</TextView>
</LinearLayout>
i think i have already attached the adapter to my recycler view. if i didn't please help me to do this. Please help me to get rid of this problem
