tests/TransitionTests/res/layout/overlay_test.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:id="@+id/container"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/button"
            android:text="@string/start"
            android:onClick="onClick"/>

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/fadingButton"
            android:id="@+id/fadingButton"/>

</LinearLayout>