I know we can set the following value to the android:gravity and android:layout_gravity.
center
center_vertical
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 content of the View its used on.
android:layout_gravity sets the gravity of the View or Layout in its parent.