What is the difference between gravity and layout_gravity in Android?

I know we can set the following values to the android:gravity and android:layout_gravity properties:

1. center
2. center_vertical
3. center_horizontal, etc.

But I am confused regarding both of these.

What is the difference between the usage of android:gravity and android:layout_gravity?

Their names should help you:

• android:gravity sets the gravity of the contents (i.e. its subviews) of the View it's used on.
• android:layout_gravity sets the gravity of the View or Layout relative to its parent.

And an example is here.