layout_activity_routeline_example.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.mapbox.maps.MapView
        android:id="@+id/mapView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/startNavigation"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="@color/colorPrimary"
        android:text="@string/label_start_navigation"
        android:textColor="@android:color/white"
        android:visibility="gone" />

    <RadioGroup
        android:id="@+id/optionTrafficGradient"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:orientation="horizontal"
        android:background="#ffffff"
        android:padding="8dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:text="Traffic Gradient: "/>

        <RadioButton
            android:id="@+id/gradientOptionHard"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="Hard"/>

        <RadioButton
            android:id="@+id/gradientOptionSoft"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Soft"/>
    </RadioGroup>

    <ProgressBar
        android:id="@+id/routeLoadingProgressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:visibility="invisible"/>
</androidx.constraintlayout.widget.ConstraintLayout>