deepak - Wed Mar 07 2012 21:38:00 GMT-0500 (EST)

Definition

android:gravity sets the gravity of the content 
of the View its used on.

android:layout_gravity sets the gravity of 
the View or Layout in its parent.

deepak - Wed Mar 07 2012 21:38:30 GMT-0500 (EST)

HTML/CSS Equivalents

android:layout_gravity = float in CSS

android:gravity = text-align in CSS