testapps/buildConfigTest/app/res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/app"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="App: Release"
        tools:ignore="HardcodedText" />

    <TextView
        android:id="@+id/lib1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="\\?"
        tools:ignore="HardcodedText" />

</LinearLayout>