tests/tests/assist/service/res/layout/assist_layer.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/assist_layer"
        android:layout_width="match_parent"
        android:background="@color/assist_layer_background"
        android:layout_height="match_parent">
    <TextView
        android:layout_centerInParent="true"
        android:text="@string/test_assistant_text"
        android:textColor="@android:color/white"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</RelativeLayout>