title: bottom margin or padding doesn't work in relative layout in xml on android
body: <p>I have a <code>RelativeLayout</code> for a row that goes inside a <code>ListView</code>. The row looks like,</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/relativeLayout1" 
      android:layout_width="wrap_content"
      android:layout_height="fill_parent"&gt;
  
      &lt;ImageView
          android:id="@+id/placeDetailIcon_Img"
          android:layout_height="50dp"
          android:layout_width="50dp"
          android:layout_alignParentLeft="true" 
          android:paddingBottom="20dp"
          android:paddingTop="20dp" 
          android:paddingLeft="20dp"
          android:paddingRight="20dp"/&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>I also tried it with margin:</p>
  
  <pre><code> &lt;ImageView
      android:layout_height="50dp"
      android:layout_width="50dp"
      android:id="@+id/placeDetailIcon_Img" 
      android:layout_alignParentLeft="true" 
      android:layout_marginRight="10dp"
      android:layout_marginTop="10dp"
      android:layout_marginLeft="10dp"
      android:layout_marginBottom="10dp"&gt;
  </code></pre>
  
  <p>Neither apply the margin or padding around the <code>ImageView</code>. How do create this type of spacing?</p>