relative layout example

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:weightSum="3"
    tools:context=".MainActivity">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello A"
        android:textSize="20sp"
        android:layout_centerInParent="true"
        android:layout_weight="1"
        android:background="@color/colorPrimary"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello B"
        android:layout_weight="1"
        android:textSize="20sp"

        android:layout_alignParentRight="true"
        android:background="@color/colorAccent"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello C"
        android:layout_weight="1"
        android:layout_alignParentBottom="true"
        android:textSize="20sp"
        android:background="#fadada"/>


</RelativeLayout>