LinearLayout

LinearLayout is a container for other items known as views that show up on the screen.
Linear Layout is a layout that arranges its children in a single row.

** For API Level < 8, use fill_parent
** For API Level 8+, use match_parent (fill_parent is deprecated)

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

Resources:
http://developer.android.com/reference/android/widget/LinearLayout.html