Center a button in a Linear layout

Question

I am using a linear layout to display a pretty light initial screen. It has 1 button that is supposed to centre in the screen both horizontally and vertically. However no

Answer 1

It would be easier to use relative layouts, but for linear layouts I usually center by making sure the width matches parent :

    android:layout_width="match_parent"

and then just give margins to right and left accordingly.

    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"