arl_auto_roll_layout.xml

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

    <android.support.v4.view.ViewPager
        android:id="@+id/arl_view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:id="@+id/arl_dot_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:layout_gravity="center_horizontal|bottom"
        android:layout_marginBottom="8dp"
        ></LinearLayout>
</FrameLayout>