<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"

    app:layout_behavior="@string/appbar_scrolling_view_behavior"

    tools:context=".QuestionsScrollActivity"
    tools:showIn="@layout/activity_questions_scroll"
    >

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:choiceMode="none"
        android:layout_weight="1"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Check answers"
        android:id="@+id/checkAnswers"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:weightSum="1">

    <TextView
        android:id="@+id/questionNumberTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text=""
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Test question"
        android:id="@+id/questionTextView"
        android:layout_weight="0.17"
        android:layout_marginTop="15dp"
        android:textSize="24sp"
        android:layout_marginBottom="15dp" />

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal">

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

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="test answer"
                android:id="@+id/answerRadioButton1"
                android:checked="false"
                android:paddingTop="5dp"
                android:paddingBottom="5dp" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="test answer"
                android:id="@+id/answerRadioButton2"
                android:checked="false" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="test answer"
                android:id="@+id/answerRadioButton3"
                android:checked="false" />

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="test answer"
                android:id="@+id/answerRadioButton4"
                android:checked="false" />

        </RadioGroup>
    </LinearLayout>
</LinearLayout>

public class QuestionAdapter extends ArrayAdapter<Question> {
    public QuestionAdapter(Context context, ArrayList<Question> questions) {
        super(context, 0, questions);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final Question question = getItem(position);
        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.question, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.questionNumberTextView = (TextView) convertView.findViewById(R.id.questionNumberTextView);
            viewHolder.questionTextView = (TextView) convertView.findViewById(R.id.questionTextView);
            viewHolder.radioGroup = (RadioGroup) convertView.findViewById(R.id.radioGroup);
            viewHolder.answerRadioButton1 = (RadioButton) convertView.findViewById(R.id.answerRadioButton1);
            viewHolder.answerRadioButton2 = (RadioButton) convertView.findViewById(R.id.answerRadioButton2);
            viewHolder.answerRadioButton3 = (RadioButton) convertView.findViewById(R.id.answerRadioButton3);
            viewHolder.answerRadioButton4 = (RadioButton) convertView.findViewById(R.id.answerRadioButton4);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }


        List<Answer> answerList = question.getAnswers();

        if (answerList != null) {
            viewHolder.questionNumberTextView.setText("Question # " + (position + 1));
            viewHolder.questionTextView.setText(question.getQuestion());
            viewHolder.answerRadioButton1.setText(answerList.get(0).getAnswer());
            viewHolder.answerRadioButton2.setText(answerList.get(1).getAnswer());
            viewHolder.answerRadioButton3.setText(answerList.get(2).getAnswer());
            viewHolder.answerRadioButton4.setText(answerList.get(3).getAnswer());

        }

        return convertView;
    }

    static class ViewHolder {
        TextView questionNumberTextView;
        TextView questionTextView;
        RadioGroup radioGroup;
        RadioButton answerRadioButton1;
        RadioButton answerRadioButton2;
        RadioButton answerRadioButton3;
        RadioButton answerRadioButton4;
    }
}