Как использовать Radiogroup с 4 разными переключателями в ArrayAdapter

У меня есть настраиваемый адаптер списка, у которого есть вопрос в текстовом представлении и четыре варианта ответа в радиокнопках. Все радиокнопки объединены в радиогруппу. Проблема в том, что я не могу отслеживать проверенные кнопки. При прокрутке кнопки проверяются случайным образом. Как я могу сохранить переключатели, которые проверяются для определенного

открытый класс MCQAdapter расширяет ArrayAdapter {

public MCQAdapter(Activity context, ArrayList<MCQ> mcq) {
    super(context, 0, mcq);
}

@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View listItemView = convertView;

    if (listItemView == null) {
        listItemView = LayoutInflater.from(getContext()).inflate(R.layout.activity_mcqlist, parent, false);
    }


    final MCQ currentContent = (MCQ) getItem(position);
    TextView content = (TextView) listItemView.findViewById(R.id.Question_Block);
    content.setText(currentContent.getQuestion());

    RadioGroup rg = (RadioGroup) listItemView.findViewById(R.id.Radio_Group);

    final RadioButton rb1 = (RadioButton) listItemView.findViewById(R.id.Option1_Block);
    rb1.setText(currentContent.getOptionA());

    final RadioButton rb2 = (RadioButton) listItemView.findViewById(R.id.Option2_Block);
    rb2.setText(currentContent.getOptionB());

    final RadioButton rb3 = (RadioButton) listItemView.findViewById(R.id.Option3_Block);
    rb3.setText(currentContent.getOptionC());

    final RadioButton rb4 = (RadioButton) listItemView.findViewById(R.id.Option4_Block);
    rb4.setText(currentContent.getOptionD());

    return listItemView;

}

}

public class MCQ {

String question,optionA,optionB,optionC,optionD,answer,userAnswer;

public MCQ(String quest,String a,String b,String c, String d,String ans){

    question = quest;
    optionA = a;
    optionB = b;
    optionC = c;
    optionD = d;
    answer = ans;

}

public String getQuestion(){
    return question;
}

public String getOptionA() {
    return optionA;
}

public String getOptionB() {
    return optionB;
}

public String getOptionC() {
    return optionC;
}

public String getOptionD() {
    return optionD;
}

public String getAnswer() {
    return answer;
}

public String getUserAnswer() {
    return userAnswer;
}

public void setUserAnswer(String userAnswer) {
    this.userAnswer = userAnswer;
}

}

public class PropertiesOfConstructionMaterail extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_properties_of_construction_materail);

    final ArrayList<MCQ> mcq = new ArrayList<MCQ>();

    //Creating Different Instance Of MCQ to genarte various questions for Properties of Consrtuction Material
    mcq.add(new MCQ("The property of material by which it can be beaten or rolled into thin plates, is called ?",
            "Malleability","Ductility","Plasticity","Elasticity","Malleability"));
    mcq.add(new MCQ("The property by which a body returns to its original shape after removal of the force, is called ?",
            "Plasticity","Elasticity","Ductility","Malleability","Elasticity"));
    mcq.add(new MCQ("The property of a material by which it can be drawn into smaller section due to tension, is called ?"
            ,"Plasticity","Ductility","Elasticity","Malleability","Ductility")); 

MCQAdapter adapter = new MCQAdapter(this,mcq);

    ListView listView = (ListView) findViewById(R.id.list);
    listView.setAdapter(adapter);
}

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_mcqlist"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.silen.civilengineeringmcq.MCQList"
android:orientation="vertical">

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/Question_Block"
    android:textSize="18dp"
    android:textStyle="bold"/>

<RadioGroup
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/Radio_Group">

    <RadioButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Option1_Block"
        android:checked="false"/>

    <RadioButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Option2_Block"
        android:checked="false"/>

    <RadioButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Option3_Block"
        android:checked="false"/>

    <RadioButton
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Option4_Block"
        android:checked="false"/>

</RadioGroup>