Why doesn't my radioButton get checked or unchecked? - arraylist

Question

I followed a tutorial to check a single radioButton. I tried to change it so you can change multiple radioButtons.
I succeeded to get the value out of the arraylist and show it on the screen, but when I click on it doesn't change. Only the radioButton that is unchecked get checked. Can anyone help me with this.
public interface ItemClickListener {
//Create method
void onClick(String s);
}
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.AdapterView;
import android.widget.RadioButton;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
//Initialize variable
RecyclerView recyclerView;
ItemClickListener itemClickListener;
MainAdapter adapter;
ArrayList<String> arrayList;
ArrayList<Boolean> arrayList_B;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Assign variable
recyclerView = findViewById(R.id.recycler_view);
fillArrayList();
//Initialize listener
itemClickListener = new ItemClickListener() {
#Override
public void onClick(String s) {
//Notify adapter
recyclerView.post(new Runnable() {
#Override
public void run() {
adapter.notifyDataSetChanged();
}
});
//Display toast
Toast.makeText(getApplicationContext(),
"Selected : " + s, Toast.LENGTH_SHORT).show();
}
};
//Set layout manager
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//Initialize adapter
adapter = new MainAdapter(arrayList, arrayList_B, itemClickListener);
//Set adapter
recyclerView.setAdapter(adapter);
}
public void fillArrayList() {
//initialize array list
arrayList = new ArrayList<>();
arrayList_B = new ArrayList<>();
//Use for loop
for (int i = 0; i < 10; i++) {
//Add values in array list
arrayList.add("RB " + i);
arrayList_B.add(true);
}
arrayList_B.set(3,false);
}
}
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder> {
//Initialize variable
ArrayList<String> arrayList;
ArrayList<Boolean> arrayList_B;
ItemClickListener itemClickListener;
int selectedPosition = -1;
//Create constructor
public MainAdapter(ArrayList<String> arrayList, ArrayList<Boolean> arrayList_B, ItemClickListener itemClickListener) {
this.arrayList = arrayList;
this.itemClickListener = itemClickListener;
this.arrayList_B = arrayList_B;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
//Initialize view
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_main, parent, false);
//Pass holder view
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
//Set text on radio button
holder.radioButton.setText(arrayList.get(position));
//Set true or false radio button
holder.radioButton.setChecked(arrayList_B.get(position));
//Set listener on radio button
holder.radioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
//When checked
//Update selected position
selectedPosition = holder.getAdapterPosition();
//if (arrayList_B.get(selectedPosition).equals(true)) {
//if (b == true) {
// arrayList_B.set(selectedPosition, false);
//}
//if (b == false) {
//
//}
arrayList_B.set(selectedPosition, b);
holder.radioButton.setChecked(arrayList_B.get(selectedPosition));
//Call listener
//Get RadioButton name.
itemClickListener.onClick(holder.radioButton.getText().toString());
//set array list radiobutton
}
});
}
#Override
public long getItemId(int position) {
//Pass position
return position;
}
#Override
public int getItemViewType(int position) {
//Pass position
return position;
}
#Override
public int getItemCount() {
//Pass total List size
return arrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
//Initialize variable
RadioButton radioButton;
public ViewHolder(#NonNull View itemView) {
super(itemView);
//Assign variable
radioButton = itemView.findViewById(R.id.radiobutton);
}
}
}
The Layout: activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/recycler_view"
tools:listitem="#layout/item_main"/>
</RelativeLayout>
The Layout: item_main.xml
<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/radiobutton"
android:padding="12dp"
android:textSize="18sp"
android:textColor="#android:color/darker_gray"/>