<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/transparent">

    <ImageView
        android:id="@+id/progress"
        android:layout_width="55dp"
        android:layout_height="55dp"
        android:layout_centerInParent="true"
        android:background="@anim/progress"
        android:contentDescription="@null" />

</RelativeLayout>