ui with xml

activity_main.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:id="@+id/txtHeader"
            style="@style/TextAppearance.MaterialComponents.Headline2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="20dp"
            android:paddingHorizontal="20dp"
            android:text="Hello Compose"
            android:textAlignment="center" />

        <ImageView
            android:id="@+id/imgSelectedAnimal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:contentDescription="selected animal image"
            android:paddingHorizontal="20dp"
            android:scaleType="centerCrop"
            android:layout_marginBottom="20dp"
            android:src="@drawable/ic_launcher_foreground" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_marginBottom="20dp"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/radioButtonDog"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

            <Space
                android:layout_width="100dp"
                android:layout_height="wrap_content" />

            <RadioButton
                android:id="@+id/radioButtonCat"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />

        </LinearLayout>

        <Button
            android:id="@+id/btnScrollToTop"
            android:layout_width="wrap_content"
            android:backgroundTint="@color/black"
            android:textColor="@color/white"
            android:text="Scroll to Top"
            android:textAllCaps="false"
            android:layout_height="wrap_content"/>

    </LinearLayout>

</ScrollView>