Program to print hello world

 <?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".Main3Activity"

    android:background="@color/colorAccent">

    <TextView

        android:id="@+id/textView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="HELLO WORLD"

        android:layout_gravity="center"

        android:layout_marginTop="300dp"

        android:layout_marginLeft="100dp"

        android:textSize="30dp"

        android:textColor="#FFFFFF"

        android:textStyle="bold"

        />

</RelativeLayout>