Adding xml file to adding the ImageView and ProgressBar component

activity_main.xml

<?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="com.mukminullah.imagetransformer.MainActivity">

    <ProgressBar
        android:id="@+id/pb"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"/>

    <ImageView
        android:id="@+id/img_load"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</RelativeLayout>