xml

xml.xml

<RelativeLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:orientation="horizontal"
 android:padding="4dp">

 <Button
   android:id="@+id/button"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:text="Clicked: 0" />

</RelativeLayout>