activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:background="#424141"
    tools:context=".MainActivity">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

   <ImageView
       android:id="@+id/b_kompass"
       android:src="@drawable/b_compass"
       android:layout_width="400dp"
       android:layout_height="400dp"
       android:paddingTop="12dp"
       android:layout_centerInParent="true"/>

   <ImageView
       android:id="@+id/kompass"
       android:layout_width="300dp"
       android:layout_height="300dp"
       android:layout_centerInParent="true"
       android:src="@drawable/compass" />

</RelativeLayout>

</LinearLayout>