title: Why does my ImageView not fill the whole screen using scaleType=fitXY?
body: <p>I'm having trouble understanding my <code>ImageView</code> does not scale to fill the entirety of the screen.</p>
  
  <p>There seems to be some white space along the sides.</p>
  
  <p>Here is what I mean:
  <a href="https://i.stack.imgur.com/8Ungb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8Ungb.png" alt="enter image description here"></a></p>
  
  <p>My .xml:</p>
  
  <pre><code>&lt;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:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      android:paddingBottom="@dimen/activity_vertical_margin"
      tools:context="org.Activity"&gt;
  
      &lt;ImageView
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:background="@drawable/coupon"
          android:scaleType="fitXY" /&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>What am I not understanding? Thanks.</p>