example

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="16dp"
android:paddingRight="16dp">

    <TextView
android:id="@+id/day"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:textSize="20dp"
android:gravity="center"
android:textStyle="bold"
android:layout_centerInParent="true"
android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>
</RelativeLayout>