lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/data/res/layout/namespace4.xml

<android.support.v7.widget.GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res/com.example.apicalltest"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:columnCount="1"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_column="0"
        app:layout_gravity="center"
        app:layout_row="0"
        android:text="Button" />

</android.support.v7.widget.GridLayout>