res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <com.android.gallery3d.ui.GLRootView
        android:id="@+id/gl_root_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>