title: icon image within circle background android UI
body: <p>I am trying to insert an icon within a circular background image, but I'm having an issue with image sizing. The icon is currently larger than the circle, and I can't seem to resize it without also resizing the circle background. Here is my XML:</p>
  
  <pre><code>&lt;android.support.v7.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:gravity="center"&gt;
  
  &lt;ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:background="@drawable/circle_dark_grey"
      android:src="@drawable/calendar_icon" /&gt;
  
  &lt;/android.support.v7.widget.LinearLayoutCompat&gt;
  </code></pre>
  
  <p>I'm pretty new to android UI, so if there is a better way to do this, or if you know how to solve my issue please let me know!</p>
  
  <p>Cheers</p>