<?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"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    android:background="#000"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtBlue"
        android:text="BLUE"
        android:layout_below="@id/txtYellow"
        android:layout_toStartOf="@id/txtYellow"
        android:textSize="35sp"
        android:background="#0a58ff"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtYellow"
        android:layout_toEndOf="@id/txtGreen"
        android:layout_below="@+id/txtGreen"
        android:text="YELLOW"
        android:textSize="35sp"
        android:background="#ffd20a"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/txtRed"
        android:layout_toEndOf="@id/txtRed"
        android:id="@+id/txtGreen"
        android:text="GREEN"
        android:textSize="35sp"
        android:background="#0aff70"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/txtRed"
        android:text="RED"
        android:textSize="35sp"
        android:background="#ff0a0a"/>

</RelativeLayout>